kolibrios/kernel/trunk/kernel.asm

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Copyright (C) KolibriOS team 2004-2022. All rights reserved.
;; Kernel programmers are acknowledged in CREDITS.TXT
;;
;; Data in this file was originally part of MenuetOS project which is
;; distributed under the terms of GNU GPL. It is modified and redistributed as
;; part of KolibriOS project under the terms of GNU GPL.
;;
;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa
;;
;; KolibriOS is distributed in the hope that it will be useful, but WITHOUT ANY
;; WARRANTY. No author or distributor accepts responsibility to anyone for the
;; consequences of using it or for whether it serves any particular purpose or
;; works at all, unless he says so in writing. Refer to the GNU General Public
;; License (the "GPL") for full details.
;
;; Everyone is granted permission to copy, modify and redistribute KolibriOS,
;; but only under the conditions described in the GPL. A copy of this license
;; is supposed to have been given to you along with KolibriOS so you can know
;; your rights and responsibilities. It should be in a file named COPYING.
;; Among other things, the copyright notice and this notice must be preserved
;; on all copies.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format binary as "mnt"

include 'macros.inc'
include 'struct.inc'

$Revision$


USE_COM_IRQ     = 1      ; make irq 3 and irq 4 available for PCI devices
VESA_1_2_VIDEO  = 0      ; enable vesa 1.2 bank switch functions

; Enabling the next line will enable serial output console
;debug_com_base  = 0x3f8  ; 0x3f8 is com1, 0x2f8 is com2, 0x3e8 is com3, 0x2e8 is com4, no irq's are used

include "proc32.inc"
include "kglobals.inc"
include "lang.inc"
include "encoding.inc"

include "const.inc"

iglobal
; The following variable, if equal to 1, duplicates debug output to the screen.
debug_direct_print db 0
; Start the first app (LAUNCHER) after kernel is loaded? (1=yes, 2 or 0=no)
launcher_start db 1
endg

max_processes  =  255
tss_step       =  128 + 8192 ; tss & i/o - 65535 ports, * 256=557056*4

os_stack       =  os_data_l - gdts    ; GDTs
os_code        =  os_code_l - gdts
graph_data     =  3 + graph_data_l - gdts
tss0           =  tss0_l - gdts
app_code       =  3 + app_code_l - gdts
app_data       =  3 + app_data_l - gdts
app_tls        =  3 + tls_data_l - gdts
pci_code_sel   =  pci_code_32-gdts
pci_data_sel   =  pci_data_32-gdts


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;   Included files:
;;
;;   Kernel16.inc
;;    - Booteng.inc   English text for bootup
;;    - Bootcode.inc  Hardware setup
;;    - Pci16.inc     PCI functions
;;
;;   Kernel32.inc
;;    - Sys32.inc     Process management
;;    - Shutdown.inc  Shutdown and restart
;;    - Fat32.inc     Read / write hd
;;    - Vesa12.inc    Vesa 1.2 driver
;;    - Vesa20.inc    Vesa 2.0 driver
;;    - Vga.inc       VGA driver
;;    - Stack.inc     Network interface
;;    - Mouse.inc     Mouse pointer
;;    - Scincode.inc  Window skinning
;;    - Pci32.inc     PCI functions
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; In bios boot mode the kernel code below is appended to bootbios.bin file.
; That is a loading and initialization code that also draws the blue screen
; menu with svn revision number near top right corner of the screen. This fasm
; preprocessor code searches for '****' signature inside bootbios.bin and
; places revision number there.
if ~ defined UEFI
  bootbios:
  if defined extended_primary_loader
    file 'bootbios.bin.ext_loader'
  else if defined pretest_build
    file 'bootbios.bin.pretest'
  else
    file 'bootbios.bin'
  end if
  if __REV__ > 0
    cur_pos = 0
    cnt = 0
    repeat $ - bootbios
      load a byte from %
      if a = '*'
        cnt = cnt + 1
      else
        cnt = 0
      end if
      if cnt = 4
        cur_pos = % - 1
        break
      end if
    end repeat
    store byte ' ' at cur_pos + 1
    rev_var = __REV__
    while rev_var > 0
      store byte rev_var mod 10 + '0' at cur_pos
      cur_pos = cur_pos - 1
      rev_var = rev_var / 10
    end while
      store byte ' ' at cur_pos
      store dword ' SVN' at cur_pos - 4
  end if
end if

use32
org $+0x10000

align 4
B32:
        mov     ax, os_stack       ; Selector for os
        mov     ds, ax
        mov     es, ax
        mov     fs, ax
        mov     gs, ax
        mov     ss, ax
        mov     esp, TMP_STACK_TOP       ; Set stack

; CLEAR 0x280000 - HEAP_BASE

        xor     eax, eax
        mov     edi, CLEAN_ZONE
        mov     ecx, (HEAP_BASE - OS_BASE - CLEAN_ZONE) / 4
        cld
        rep stosd

; CLEAR KERNEL UNDEFINED GLOBALS
        mov     edi, endofcode - OS_BASE
        mov     ecx, 0x90000
        sub     ecx, edi
        shr     ecx, 2
        rep stosd

; SAVE & CLEAR 0-0xffff

        mov     edi, 0x1000
        mov     ecx, 0x8000 / 4
        rep stosd
        mov     edi, 0xa000
        mov     ecx, 0x6000 / 4
        rep stosd

        call    test_cpu
        bts     [cpu_caps - OS_BASE], CAPS_TSC    ;force use rdtsc

        call    acpi_locate
        call    init_BIOS32
; MEMORY MODEL
        call    mem_test
        call    init_mem
        call    init_page_map

; ENABLE PAGING

        mov     eax, sys_proc - OS_BASE + PROC.pdt_0
        mov     cr3, eax

        mov     eax, cr0
        or      eax, CR0_PG + CR0_WP
        mov     cr0, eax

        lgdt    [gdts]
        jmp     pword os_code:high_code

align 4
bios32_entry    dd ?
tmp_page_tabs   dd ?
use16
ap_init16:
        cli
        lgdt    [cs:gdts_ap - ap_init16]
        mov     eax, [cs:cr3_ap - ap_init16]
        mov     cr3, eax
        mov     eax, [cs:cr4_ap - ap_init16]
        mov     cr4, eax
        mov     eax, CR0_PE + CR0_PG + CR0_WP
        mov     cr0, eax
        jmp     pword os_code:ap_init_high
align 16
gdts_ap:
        dw     gdte-gdts-1
        dd     gdts
        dw     0
cr3_ap  dd     ?
cr4_ap  dd     ?
ap_init16_size = $ - ap_init16
use32

__DEBUG__ fix 1
__DEBUG_LEVEL__ fix 1
include 'init.inc'

org OS_BASE+$

include 'fdo.inc'

align 4
high_code:
        mov     ax, os_stack
        mov     bx, app_data
        mov     cx, app_tls
        mov     ss, ax
        add     esp, OS_BASE

        mov     ds, bx
        mov     es, bx
        mov     fs, cx
        mov     gs, bx

        xor     eax, eax
        mov     ebx, 0xFFFFF000 + PG_SHARED + PG_NOCACHE + PG_UWR
        bt      [cpu_caps], CAPS_PAT
        setc    al
        shl     eax, 7
        or      ebx, eax

        mov     eax, PG_GLOBAL
        bt      [cpu_caps], CAPS_PGE
        jnc     @F

        or      [sys_proc + PROC.pdt_0 + (OS_BASE shr 20)], eax
        or      ebx, eax

        mov     eax, cr4
        or      eax, CR4_PGE
        mov     cr4, eax
@@:
        mov     [pte_valid_mask], ebx

        xor     eax, eax
        mov     dword [sys_proc + PROC.pdt_0], eax
        mov     dword [sys_proc + PROC.pdt_0+4], eax

        mov     eax, cr3
        mov     cr3, eax          ; flush TLB

        mov     ecx, pg_data.mutex
        call    mutex_init

        mov     ecx, disk_list_mutex
        call    mutex_init

        mov     ecx, keyboard_list_mutex
        call    mutex_init

        mov     ecx, unpack_mutex
        call    mutex_init

        mov     ecx, application_table_mutex
        call    mutex_init

        mov     ecx, ide_mutex
        call    mutex_init
        mov     ecx, ide_channel1_mutex
        call    mutex_init
        mov     ecx, ide_channel2_mutex
        call    mutex_init
        mov     ecx, ide_channel3_mutex
        call    mutex_init
        mov     ecx, ide_channel4_mutex
        call    mutex_init
        mov     ecx, ide_channel5_mutex
        call    mutex_init
        mov     ecx, ide_channel6_mutex
        call    mutex_init
;-----------------------------------------------------------------------------
; SAVE REAL MODE VARIABLES
;-----------------------------------------------------------------------------
; --------------- APM ---------------------

; init selectors
        mov     ebx, [BOOT.apm_entry]        ; offset of APM entry point
        movzx   eax, word [BOOT.apm_code_32] ; real-mode segment base address of
                                             ; protected-mode 32-bit code segment
        movzx   ecx, word [BOOT.apm_code_16] ; real-mode segment base address of
                                             ; protected-mode 16-bit code segment
        movzx   edx, word [BOOT.apm_data_16] ; real-mode segment base address of
                                             ; protected-mode 16-bit data segment

        shl     eax, 4
        mov     [dword apm_code_32 + 2], ax
        shr     eax, 16
        mov     [dword apm_code_32 + 4], al

        shl     ecx, 4
        mov     [dword apm_code_16 + 2], cx
        shr     ecx, 16
        mov     [dword apm_code_16 + 4], cl

        shl     edx, 4
        mov     [dword apm_data_16 + 2], dx
        shr     edx, 16
        mov     [dword apm_data_16 + 4], dl

        mov     dword[apm_entry], ebx
        mov     word [apm_entry + 4], apm_code_32 - gdts

        mov     eax, dword[BOOT.apm_version]   ; version & flags
        mov     [apm_vf], eax
; -----------------------------------------
        mov     al, [BOOT.dma]            ; DMA access
        mov     [allow_dma_access], al

        mov     al, [BOOT.debug_print]    ; If nonzero, duplicates debug output to the screen
        mov     [debug_direct_print], al

        mov     al, [BOOT.launcher_start] ; Start the first app (LAUNCHER) after kernel is loaded?
        mov     [launcher_start], al

        mov     eax, [BOOT.devicesdat_size]
        mov     [acpi_dev_size], eax
        mov     eax, [BOOT.devicesdat_data]
        mov     [acpi_dev_data], eax

        mov     esi, BOOT.bios_hd
        movzx   ecx, byte [esi-1]
        mov     [NumBiosDisks], ecx
        mov     edi, BiosDisksData
        shl     ecx, 2
        rep movsd

; -------- Fast System Call init ----------
; Intel SYSENTER/SYSEXIT (AMD CPU support it too)
        bt      [cpu_caps], CAPS_SEP
        jnc     .SEnP  ; SysEnter not Present
        xor     edx, edx
        mov     ecx, MSR_SYSENTER_CS
        mov     eax, os_code
        wrmsr
        mov     ecx, MSR_SYSENTER_ESP
;           mov eax, sysenter_stack ; Check it
        xor     eax, eax
        wrmsr
        mov     ecx, MSR_SYSENTER_EIP
        mov     eax, sysenter_entry
        wrmsr
.SEnP:
; AMD SYSCALL/SYSRET
        cmp     byte[cpu_vendor], 'A'
        jne     .noSYSCALL
        mov     eax, 0x80000001
        cpuid
        test    edx, 0x800  ; bit_11 - SYSCALL/SYSRET support
        jz      .noSYSCALL
        mov     ecx, MSR_AMD_EFER
        rdmsr
        or      eax, 1 ; bit_0 - System Call Extension (SCE)
        wrmsr

        ; !!!! It`s dirty hack, fix it !!!
        ; Bits of EDX :
        ; Bit 31–16 During the SYSRET instruction, this field is copied into the CS register
        ;  and the contents of this field, plus 8, are copied into the SS register.
        ; Bit 15–0 During the SYSCALL instruction, this field is copied into the CS register
        ;  and the contents of this field, plus 8, are copied into the SS register.

        ; mov   edx, (os_code + 16) * 65536 + os_code
        mov     edx, 0x1B0008

        mov     eax, syscall_entry
        mov     ecx, MSR_AMD_STAR
        wrmsr
.noSYSCALL:
; -----------------------------------------
        stdcall alloc_page
        stdcall map_page, tss-0xF80, eax, PG_SWR
        stdcall alloc_page
        stdcall map_page, tss+0x80, eax, PG_SWR
        stdcall alloc_page
        stdcall map_page, tss+0x1080, eax, PG_SWR

; LOAD IDT

        call    build_interrupt_table ;lidt is executed
          ;lidt [idtreg]

        call    init_kernel_heap
        call    init_fpu
        mov     eax, [xsave_area_size]
        lea     eax, [eax*2 + RING0_STACK_SIZE*2]
        stdcall kernel_alloc, eax
        mov     [os_stack_seg], eax

        lea     esp, [eax + RING0_STACK_SIZE]

        mov     [tss._ss0], os_stack
        mov     [tss._esp0], esp
        mov     [tss._esp], esp
        mov     [tss._cs], os_code
        mov     [tss._ss], os_stack
        mov     [tss._ds], app_data
        mov     [tss._es], app_data
        mov     [tss._fs], app_data
        mov     [tss._gs], app_data
        mov     [tss._io], 128
;Add IO access table - bit array of permitted ports
        mov     edi, tss._io_map_0
        xor     eax, eax
        not     eax
        mov     ecx, 8192/4
        rep stosd                    ; access to 4096*8=65536 ports

        mov     ax, tss0
        ltr     ax

        mov     eax, sys_proc
        list_init eax
        add     eax, PROC.thr_list
        list_init eax

        call    init_video
        call    init_mtrr
        mov     [LFBAddress], LFB_BASE
        mov     ecx, bios_fb
        call    set_framebuffer
        call    init_malloc

        stdcall alloc_kernel_space, 0x50000         ; FIXME check size
        mov     [default_io_map], eax

        add     eax, 0x2000
        mov     [ipc_tmp], eax
        mov     ebx, 0x1000

        add     eax, 0x40000
        mov     [proc_mem_map], eax

        add     eax, 0x8000
        mov     [proc_mem_pdir], eax

        add     eax, ebx
        mov     [proc_mem_tab], eax

        add     eax, ebx
        mov     [tmp_task_ptab], eax

        add     eax, ebx
        mov     [ipc_pdir], eax

        add     eax, ebx
        mov     [ipc_ptab], eax

        stdcall kernel_alloc, (unpack.LZMA_BASE_SIZE + (unpack.LZMA_LIT_SIZE shl \
                (unpack.lc + unpack.lp)))*4

        mov     [unpack.p], eax

        call    init_events
        mov     eax, srv.fd - SRV.fd
        mov     [srv.fd], eax
        mov     [srv.bk], eax

;Set base of graphic segment to linear address of LFB
        mov     eax, [LFBAddress]         ; set for gs
        mov     [graph_data_l+2], ax
        shr     eax, 16
        mov     [graph_data_l+4], al
        mov     [graph_data_l+7], ah

        stdcall kernel_alloc, [_display.win_map_size]
        mov     [_display.win_map], eax

        xor     eax, eax
        inc     eax

; set background

        mov     [BgrDrawMode], eax
        mov     [BgrDataWidth], eax
        mov     [BgrDataHeight], eax
        mov     [mem_BACKGROUND], 4
        mov     [img_background], static_background_data

; set clipboard

        xor     eax, eax
        mov     [clipboard_slots], eax
        mov     [clipboard_write_lock], eax
        stdcall kernel_alloc, PAGE_SIZE
        test    eax, eax
        jnz     @f

        dec     eax
@@:
        mov     [clipboard_main_list], eax

        call    check_acpi

        mov     eax, [hpet_base]
        test    eax, eax
        jz      @F
        stdcall map_io_mem, [hpet_base], 1024, PG_GLOBAL + PAT_UC + PG_SWR
        mov     [hpet_base], eax
        mov     eax, [eax+HPET_ID]
        DEBUGF  1, "K : HPET caps %x\n", eax
        call    init_hpet
@@:
; SET UP OS TASK

        mov     esi, boot_setostask
        call    boot_log

        mov     edi, sys_proc + PROC.heap_lock
        mov     ecx, (PROC.ht_free - PROC.heap_lock)/4

        xor     eax, eax
        cld
        rep stosd

        mov     [edi], dword (PROC.pdt_0 - PROC.htab)/4 - 3
        mov     [edi+4], dword 3           ;reserve handles for stdin stdout and stderr
        mov     ecx, (PROC.pdt_0 - PROC.htab)/4
        add     edi, 8
        inc     eax
@@:
        stosd
        inc     eax
        cmp     eax, ecx
        jbe     @B

        mov     [sys_proc + PROC.pdt_0_phys], sys_proc - OS_BASE + PROC.pdt_0

        mov     eax, -1
        mov     edi, thr_slot_map+4
        mov     [edi-4], dword 0xFFFFFFF8
        stosd
        stosd
        stosd
        stosd
        stosd
        stosd
        stosd

        mov     [current_process], sys_proc

        mov     edx, SLOT_BASE + sizeof.APPDATA*1
        mov     ebx, [os_stack_seg]
        add     ebx, RING0_STACK_SIZE
        add     ebx, [xsave_area_size]
        call    setup_os_slot
        mov     dword [edx], 'IDLE'
        sub     [edx + APPDATA.saved_esp], 4
        mov     eax, [edx + APPDATA.saved_esp]
        mov     dword [eax], idle_thread
        mov     ecx, IDLE_PRIORITY
        call    scheduler_add_thread

        mov     edx, SLOT_BASE + sizeof.APPDATA*2
        mov     ebx, [os_stack_seg]
        call    setup_os_slot
        mov     dword [edx], 'OS'
        xor     ecx, ecx
        call    scheduler_add_thread

        mov     dword [current_slot_idx], 2
        mov     [thread_count], 2
        mov     dword [current_slot], SLOT_BASE + sizeof.APPDATA*2

; Move other CPUs to deep sleep, if it is useful
uglobal
use_mwait_for_idle db 0
endg
        cmp     [cpu_vendor+8], 'ntel'
        jnz     .no_wake_cpus
        bt      [cpu_caps+4], CAPS_MONITOR-32
        jnc     .no_wake_cpus
        dbgstr 'using mwait for idle loop'
        inc     [use_mwait_for_idle]
        mov     ebx, [cpu_count]
        cmp     ebx, 1
        jbe     .no_wake_cpus
        call    create_trampoline_pgmap
        mov     [cr3_ap + OS_BASE], eax
        mov     eax, cr4
        mov     [cr4_ap + OS_BASE], eax
        mov     esi, OS_BASE + ap_init16
        mov     edi, OS_BASE + 8000h
        mov     ecx, (ap_init16_size + 3) / 4
        rep movsd
        mov     eax, [LAPIC_BASE]
        test    eax, eax
        jnz     @f
        stdcall map_io_mem, [acpi_lapic_base], 0x1000, PG_GLOBAL + PG_NOCACHE + PG_SWR
        mov     [LAPIC_BASE], eax
@@:
        lea     edi, [eax + APIC_ICRL]
        mov     esi, smpt+4
        dec     ebx
.wake_cpus_loop:
        lodsd
        push    esi
        xor     esi, esi
        inc     esi
        shl     eax, 24
        mov     [edi+10h], eax
; assert INIT IPI
        mov     dword [edi], 0C500h
        call    delay_ms
@@:
        test    dword [edi], 1000h
        jnz     @b
; deassert INIT IPI
        mov     dword [edi], 8500h
        call    delay_ms
@@:
        test    dword [edi], 1000h
        jnz     @b
; send STARTUP IPI
        mov     dword [edi], 600h + (8000h shr 12)
        call    delay_ms
@@:
        test    dword [edi], 1000h
        jnz     @b
        pop     esi
        dec     ebx
        jnz     .wake_cpus_loop
        mov     eax, [cpu_count]
        dec     eax
@@:
        cmp     [ap_initialized], eax
        jnz     @b
        mov     eax, [cr3_ap + OS_BASE]
        call    free_page
.no_wake_cpus:

; REDIRECT ALL IRQ'S TO INT'S 0x20-0x2f
        mov     esi, boot_initirq
        call    boot_log
        call    init_irqs

        mov     esi, boot_picinit
        call    boot_log
        call    PIC_init

        mov     esi, boot_v86machine
        call    boot_log
; Initialize system V86 machine
        call    init_sys_v86

        mov     esi, boot_inittimer
        call    boot_log
; Initialize system timer (IRQ0)
        call    PIT_init

; Register ramdisk file system
if ~ defined extended_primary_loader
        cmp     [BOOT.rd_load_from], RD_LOAD_FROM_HD    ; will be loaded later
        je      @f
end if
        cmp     [BOOT.rd_load_from], RD_LOAD_FROM_NONE
        je      @f
        call    register_ramdisk
;--------------------------------------
@@:
        mov     esi, boot_initapic
        call    boot_log
; Try to Initialize APIC
        call    APIC_init

        mov     esi, boot_enableirq
        call    boot_log
; Enable timer IRQ (IRQ0) and co-processor IRQ (IRQ13)
; they are used: when partitions are scanned, hd_read relies on timer
        call    unmask_timer
        ; Prevent duplicate timer IRQs in APIC mode
        cmp     [irq_mode], IRQ_APIC
        jz      @f
        stdcall enable_irq, 2               ; @#$%! PIC
@@:
        stdcall enable_irq, 13              ; co-processor

; Setup serial output console (if enabled)
if defined debug_com_base

        ; reserve port so nobody else will use it
        xor     ebx, ebx
        mov     ecx, debug_com_base
        mov     edx, debug_com_base+7
        call    r_f_port_area

        ; enable Divisor latch
        mov     dx, debug_com_base+3
        mov     al, 1 shl 7
        out     dx, al

        ; Set speed to 115200 baud (max speed)
        mov     dx, debug_com_base
        mov     al, 0x01
        out     dx, al

        mov     dx, debug_com_base+1
        mov     al, 0x00
        out     dx, al

        ; No parity, 8bits words, one stop bit, dlab bit back to 0
        mov     dx, debug_com_base+3
        mov     al, 3
        out     dx, al

        ; disable interrupts
        mov     dx, debug_com_base+1
        mov     al, 0
        out     dx, al

        ; clear +  enable fifo (64 bits)
        mov     dx, debug_com_base+2
        mov     al, 0x7 + 1 shl 5
        out     dx, al

end if


;-----------------------------------------------------------------------------
; show SVN version of kernel on the message board
;-----------------------------------------------------------------------------
        mov     eax, [version_inf.rev]
        DEBUGF  1, "K : kernel SVN r%d\n", eax
;-----------------------------------------------------------------------------
; show CPU count on the message board
;-----------------------------------------------------------------------------
        mov     eax, [cpu_count]
        test    eax, eax
        jnz     @F
        mov     al, 1                             ; at least one CPU
@@:
        DEBUGF  1, "K : %d CPU detected\n", eax
;-----------------------------------------------------------------------------
; detect Floppy drives
;-----------------------------------------------------------------------------
        mov     esi, boot_detectfloppy
        call    boot_log
include 'detect/dev_fd.inc'
;-----------------------------------------------------------------------------
; create pci-devices list
;-----------------------------------------------------------------------------
        mov     [pci_access_enabled], 1
        call    pci_enum
;-----------------------------------------------------------------------------
; initialisation IDE ATA code
;-----------------------------------------------------------------------------
include 'detect/init_ata.inc'
;-----------------------------------------------------------------------------
; initialisation AHCI code
;-----------------------------------------------------------------------------
        jmp     ahci_code_end
include 'blkdev/ahci.inc'
ahci_code_end:
        call    ahci_init
;-----------------------------------------------------------------------------
if 0
        mov     ax, [BOOT.sys_disk]
        cmp     ax, 'r1'; if using not ram disk, then load librares and parameters {SPraid.simba}
        je      no_lib_load

        mov     esi, boot_loadlibs
        call    boot_log
; LOADING LIBRARES
        stdcall dll.Load, @IMPORT           ; loading librares for kernel (.obj files)
        call    load_file_parse_table       ; prepare file parse table
        call    set_kernel_conf             ; configure devices and gui
no_lib_load:
end if

; Display APIC status
        mov     esi, boot_APIC_found
        cmp     [irq_mode], IRQ_APIC
        je      @f
        mov     esi, boot_APIC_nfound
@@:
        call    boot_log

; PRINT AMOUNT OF MEMORY
        mov     esi, boot_memdetect
        call    boot_log

        movzx   ecx, word [boot_y]
        if lang eq ru
        or      ecx, (10+30*6) shl 16
        else if lang eq sp
        or      ecx, (10+33*6) shl 16
        else
        or      ecx, (10+29*6) shl 16
        end if
        sub     ecx, 10
        mov     edx, 0xFFFFFF
        mov     ebx, [MEM_AMOUNT]
        shr     ebx, 20
        xor     edi, edi
        mov     eax, 0x00040000
        inc     edi
        call    display_number_force

; BUILD SCHEDULER

;        call    build_scheduler; sys32.inc

;        mov     esi, boot_devices
;        call    boot_log

include "detect/vortex86.inc"                     ; Vortex86 SoC detection code

        stdcall load_pe_driver, szVidintel, 0

        call    usb_init

; SET PRELIMINARY WINDOW STACK AND POSITIONS

        mov     esi, boot_windefs
        call    boot_log
        call    set_window_defaults

; SET BACKGROUND DEFAULTS

        mov     esi, boot_bgr
        call    boot_log
        call    init_background
        call    calculatebackground

; RESERVE SYSTEM IRQ'S JA PORT'S

        mov     esi, boot_resirqports
        call    boot_log
        call    reserve_irqs_ports

        mov     [SLOT_BASE + APPDATA.window], window_data
        mov     [SLOT_BASE + sizeof.APPDATA + APPDATA.window], window_data + sizeof.WDATA
        mov     [SLOT_BASE + sizeof.APPDATA*2 + APPDATA.window], window_data + sizeof.WDATA*2
        mov     [window_data + WDATA.thread], SLOT_BASE
        mov     [window_data + sizeof.WDATA + WDATA.thread], SLOT_BASE + sizeof.APPDATA
        mov     [window_data + sizeof.WDATA*2 + WDATA.thread], SLOT_BASE + sizeof.APPDATA*2

        call    init_display
        mov     eax, [def_cursor]
        mov     [window_data + sizeof.WDATA + WDATA.cursor], eax
        mov     [window_data + sizeof.WDATA*2 + WDATA.cursor], eax

; PRINT CPU FREQUENCY

        mov     esi, boot_cpufreq
        call    boot_log

        cli
        mov     ebx, [hpet_base]
        test    ebx, ebx
        jz      @F
        mov     ebx, [ebx + HPET_COUNTER]

        rdtsc
        mov     ecx, 1000
        sub     eax, [hpet_tsc_start]
        sbb     edx, [hpet_tsc_start + 4]
        shld    edx, eax, 10
        shl     eax, 10
        mov     esi, eax
        mov     eax, edx
        mul     ecx
        xchg    eax, esi
        mul     ecx
        adc     edx, esi
        div     ebx
        mul     ecx
        div     [hpet_period]
        mul     ecx
        DEBUGF  1, "K : cpu frequency %u Hz\n", eax
        jmp     .next
@@:
        rdtsc
        mov     ecx, eax
        mov     esi, 250            ; wait 1/4 a second
        call    delay_ms
        rdtsc

        sub     eax, ecx
        xor     edx, edx
        shld    edx, eax, 2
        shl     eax, 2
.next:
        mov     dword [cpu_freq], eax
        mov     dword [cpu_freq + 4], edx
        mov     ebx, 1000000
        div     ebx
        mov     ebx, eax

        movzx   ecx, word [boot_y]
        if lang eq ru
        add     ecx, (10+19*6) shl 16 - 10
        else if lang eq sp
        add     ecx, (10+25*6) shl 16 - 10
        else
        add     ecx, (10+17*6) shl 16 - 10
        end if

        mov     edx, 0xFFFFFF
        xor     edi, edi
        mov     eax, 0x00040000
        inc     edi
        call    display_number_force

; SET VARIABLES

        call    set_variables

; STACK AND FDC

        call    stack_init
        call    fdc_init

; PALETTE FOR 320x200 and 640x480 16 col

        cmp     [SCR_MODE], word 0x12
        jne     no_pal_vga
        mov     esi, boot_pal_vga
        call    boot_log
        call    paletteVGA
      no_pal_vga:

        cmp     [SCR_MODE], word 0x13
        jne     no_pal_ega
        mov     esi, boot_pal_ega
        call    boot_log
        call    palette320x200
      no_pal_ega:

; LOAD DEFAULT SKIN

        call    load_default_skin

; Protect I/O permission map

        mov     esi, [default_io_map]
        stdcall map_page, esi, [SLOT_BASE + sizeof.APPDATA + APPDATA.io_map], PG_READ
        add     esi, 0x1000
        stdcall map_page, esi, [SLOT_BASE + sizeof.APPDATA + APPDATA.io_map + 4], PG_READ

        stdcall map_page, tss._io_map_0, \
                [SLOT_BASE + sizeof.APPDATA + APPDATA.io_map], PG_READ
        stdcall map_page, tss._io_map_1, \
                [SLOT_BASE + sizeof.APPDATA + APPDATA.io_map + 4], PG_READ

; SET KEYBOARD PARAMETERS
        mov     al, 0xf6       ; reset keyboard, scan enabled
        call    kb_write_wait_ack
        test    ah, ah
        jnz     .no_keyboard

iglobal
align 4
ps2_keyboard_functions:
        dd      .end - $
        dd      0       ; no close
        dd      ps2_set_lights
.end:
endg
        stdcall register_keyboard, ps2_keyboard_functions, 0
       ; mov   al, 0xED       ; Keyboard LEDs - only for testing!
       ; call  kb_write_wait_ack
       ; mov   al, 111b
       ; call  kb_write_wait_ack

        mov     al, 0xF3     ; set repeat rate & delay
        call    kb_write_wait_ack
        mov     al, 0; 30 250 ;00100010b ; 24 500  ;00100100b  ; 20 500
        call    kb_write_wait_ack
     ;// mike.dld [
        call    set_lights
     ;// mike.dld ]
        stdcall attach_int_handler, 1, irq1, 0
        DEBUGF  1, "K : IRQ1 return code %x\n", eax
.no_keyboard:

; Load PS/2 mouse driver
        mov     esi, boot_setmouse
        call    boot_log
        stdcall load_pe_driver, szPS2MDriver, 0

; LOAD FIRST APPLICATION
        cmp     byte [launcher_start], 1        ; Check if starting LAUNCHER is selected on blue screen (1 = yes)
        jnz     first_app_found

        cli
        mov     ebp, firstapp
        call    fs_execute_from_sysdir
        test    eax, eax
        jns     first_app_found

        mov     esi, boot_failed
        call    boot_log

        mov     eax, 0xDEADBEEF      ; otherwise halt
        hlt

first_app_found:

; START MULTITASKING
preboot_blogesc = 0       ; start immediately after bootlog

; A 'All set - press ESC to start' messages if need
if preboot_blogesc
        mov     esi, boot_tasking
        call    boot_log
.bll1:
        in      al, 0x60        ; wait for ESC key press
        cmp     al, 129
        jne     .bll1
end if

        mov     [timer_ticks_enable], 1         ; for cd driver
        sti

        call    mtrr_validate

        jmp     osloop
        ; Fly :)

uglobal
align 4
ap_initialized  dd      0
endg

ap_init_high:
        mov     ax, os_stack
        mov     bx, app_data
        mov     cx, app_tls
        mov     ss, ax
        mov     ds, bx
        mov     es, bx
        mov     fs, cx
        mov     gs, bx
        xor     esp, esp
        mov     eax, sys_proc - OS_BASE + PROC.pdt_0
        mov     cr3, eax
        lock inc [ap_initialized]
        jmp     idle_loop


include 'unpacker.inc'

align 4
boot_log:
        pushad

        mov     ebx, 10*65536
        mov     bx, word [boot_y]
        add     [boot_y], dword 10
        mov     ecx, 0x80ffffff; ASCIIZ string with white color
        xor     edi, edi
        mov     edx, esi
        inc     edi
        call    dtext

        mov     [novesachecksum], 1000
        call    checkVga_N13

        popad

        ret

;-----------------------------------------------------------------------------
; Register ramdisk file system
register_ramdisk:
        mov     esi, boot_initramdisk
        call    boot_log
        call    ramdisk_init
        ret

; in: edx -> APPDATA for OS/IDLE slot
; in: ebx = stack base
proc setup_os_slot
        xor     eax, eax
        mov     ecx, sizeof.APPDATA/4
        mov     edi, edx
        rep stosd

        mov     eax, tss+0x80
        call    get_pg_addr
        inc     eax
        mov     [edx + APPDATA.io_map], eax
        mov     eax, tss+0x1080
        call    get_pg_addr
        inc     eax
        mov     [edx + APPDATA.io_map + 4], eax

        mov     dword [edx + APPDATA.pl0_stack], ebx
        lea     edi, [ebx + RING0_STACK_SIZE]
        mov     dword [edx + APPDATA.fpu_state], edi
        mov     dword [edx + APPDATA.saved_esp0], edi
        mov     dword [edx + APPDATA.saved_esp], edi
        mov     dword [edx + APPDATA.terminate_protection], 1 ; make unkillable

        mov     esi, fpu_data
        mov     ecx, [xsave_area_size]
        add     ecx, 3
        shr     ecx, 2
        rep movsd

        lea     eax, [edx + APP_EV_OFFSET]
        mov     dword [edx + APPDATA.fd_ev], eax
        mov     dword [edx + APPDATA.bk_ev], eax

        lea     eax, [edx + APP_OBJ_OFFSET]
        mov     dword [edx + APPDATA.fd_obj], eax
        mov     dword [edx + APPDATA.bk_obj], eax

        mov     dword [edx + APPDATA.cur_dir], sysdir_path-2

        mov     [edx + APPDATA.process], sys_proc

        lea     ebx, [edx + APPDATA.list]
        lea     ecx, [sys_proc + PROC.thr_list]
        list_add_tail ebx, ecx

        mov     [edx + APPDATA.wnd_number], dh
        mov     byte [edx + APPDATA.tid], dh
        movzx   eax, dh
        shl     eax, BSF sizeof.WDATA
        add     eax, window_data
        mov     [edx + APPDATA.window], eax

        ret
endp

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;                                                                    ;
;                    MAIN OS LOOP START                              ;
;                                                                    ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 32
osloop:
        mov     edx, osloop_has_work?
        xor     ecx, ecx
        call    Wait_events
        xor     eax, eax
        xchg    eax, [osloop_nonperiodic_work]
        test    eax, eax
        jz      .no_periodic

        call    __sys_draw_pointer
        call    window_check_events
        call    mouse_check_events
        call    checkmisc
        call    checkVga_N13
;--------------------------------------
.no_periodic:
        call    stack_handler
        call    check_fdd_motor_status
        call    check_ATAPI_device_event
        call    check_lights_state
        call    check_timers

        jmp     osloop
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;                                                                    ;
;                      MAIN OS LOOP END                              ;
;                                                                    ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
proc osloop_has_work?
        cmp     [osloop_nonperiodic_work], 0
        jnz     .yes
        call    stack_handler_has_work?
        jnz     .yes
        call    check_fdd_motor_status_has_work?
        jnz     .yes
        call    check_ATAPI_device_event_has_work?
        jnz     .yes
        call    check_lights_state_has_work?
        jnz     .yes
        call    check_timers_has_work?
        jnz     .yes
.no:
        xor     eax, eax
        ret
.yes:
        xor     eax, eax
        inc     eax
        ret
endp

proc wakeup_osloop
        mov     [osloop_nonperiodic_work], 1
        ret
endp

uglobal
align 4
osloop_nonperiodic_work dd      ?
endg

uglobal
align 64
idle_addr       rb      64
endg

idle_thread:
        sti

; The following code can be executed by all CPUs in the system.
; All other parts of the kernel do not expect multi-CPU.
; Also, APs don't even have a stack here.
; Beware. Don't do anything here. Anything at all.
idle_loop:
        cmp     [use_mwait_for_idle], 0
        jnz     .mwait

.hlt:
        hlt
        jmp     .hlt

.mwait:
        mov     eax, idle_addr
        xor     ecx, ecx
        xor     edx, edx
        monitor
        xor     ecx, ecx
        mov     eax, 20h        ; or 10h
        mwait
        jmp     .mwait


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;                                                                      ;
;                   INCLUDED SYSTEM FILES                              ;
;                                                                      ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


include "kernel32.inc"


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;                                                                      ;
;                       KERNEL FUNCTIONS                               ;
;                                                                      ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

reserve_irqs_ports:


; RESERVE PORTS
        mov     eax, RESERVED_PORTS
        mov     ecx, 1

        mov     [eax], dword 4

        mov     [eax+16], ecx
        mov     [eax+16+4], dword 0
        mov     [eax+16+8], dword 0x2D

        mov     [eax+32], ecx
        mov     [eax+32+4], dword 0x30
        mov     [eax+32+8], dword 0x4D

        mov     [eax+48], ecx
        mov     [eax+48+4], dword 0x50
        mov     [eax+48+8], dword 0xDF

        mov     [eax+64], ecx
        mov     [eax+64+4], dword 0xE5
        mov     [eax+64+8], dword 0xFF

        ret


iglobal
  process_number dd 0x2
endg

set_variables:

        mov     ecx, 0x16                    ; flush port 0x60
@@:
        in      al, 0x60
        loop    @b
        push    eax

        mov     ax, [BOOT.y_res]
        shr     ax, 1
        shl     eax, 16
        mov     ax, [BOOT.x_res]
        shr     ax, 1
        mov     [MOUSE_X], eax
        call    wakeup_osloop

        xor     eax, eax
        mov     [BTN_ADDR], dword BUTTON_INFO ; address of button list

        mov     byte [KEY_COUNT], al              ; keyboard buffer
        mov     byte [BTN_COUNT], al              ; button buffer

        pop     eax
        ret
;-----------------------------------------------------------------------------

align 4
display_number:
; add check pointers
        test    bl, bl
        jz      @f
        bt      ebx, 30  ; check 30 bit
        jb      @f
        stdcall is_region_userspace, ecx, 4
        jz      @f
        ret
@@:
        jz      @f
        stdcall is_region_userspace, ecx, 8
        jz      @f
        ret
@@:
        test    esi, 0x08000000
        jz      @f
        stdcall is_region_userspace, edi, 1
        jz      @f
        ret
@@:
;It is not optimization
        mov     eax, ebx
        mov     ebx, ecx
        mov     ecx, edx
        mov     edx, esi
        mov     esi, edi
; eax = print type, al=0 -> ebx is number
;                   al=1 -> ebx is pointer
;                   ah=0 -> display decimal
;                   ah=1 -> display hexadecimal
;                   ah=2 -> display binary
;                   eax bits 16-21 = number of digits to display (0-32)
;                   eax bits 22-31 = reserved
;
; ebx = number or pointer
; ecx = x shl 16 + y
; edx = color
        xor     edi, edi
display_number_force:
        push    eax
        and     eax, 0x3fffffff
        cmp     eax, 0xffff     ; length > 0 ?
        pop     eax
        jge     .cont_displ
        ret
   .cont_displ:
        push    eax
        and     eax, 0x3fffffff
        cmp     eax, 61*0x10000  ; length <= 60 ?
        pop     eax
        jb      .cont_displ2
        ret
   .cont_displ2:

        pushad

        cmp     al, 1            ; ecx is a pointer ?
        jne     @f
        mov     ebp, ebx
        add     ebp, 4
        mov     ebp, [ebp] ;[ebp + std_application_base_address]
        mov     ebx, [ebx] ;[ebx + std_application_base_address]
@@:
        sub     esp, 64

        test    ah, ah            ; DECIMAL
        jnz     .no_display_desnum

        shr     eax, 16
        and     eax, 0xC03f
;     and   eax,0x3f
        push    eax
        and     eax, 0x3f
        mov     edi, esp
        add     edi, 4+64-1
        mov     ecx, eax
        mov     eax, ebx
        mov     ebx, 10
@@:
        xor     edx, edx
        call    division_64_bits
        div     ebx
        add     dl, 48
        mov     [edi], dl
        dec     edi
        loop    @b

        pop     eax
        call    normalize_number
        call    draw_num_text
        add     esp, 64
        popad
        ret
.no_display_desnum:

        cmp     ah, 0x01         ; HEXADECIMAL
        jne     .no_display_hexnum

        shr     eax, 16
        and     eax, 0xC03f
;     and   eax,0x3f
        push    eax
        and     eax, 0x3f
        mov     edi, esp
        add     edi, 4+64-1
        mov     ecx, eax
        mov     eax, ebx
        mov     ebx, 16
@@:
        xor     edx, edx
        call    division_64_bits
        div     ebx
   ;hexletters = __fdo_hexdigits
        add     edx, __fdo_hexdigits ;hexletters
        mov     dl, [edx]
        mov     [edi], dl
        dec     edi
        loop    @b

        pop     eax
        call    normalize_number
        call    draw_num_text
        add     esp, 64
        popad
        ret
.no_display_hexnum:

        cmp     ah, 0x02         ; BINARY
        jne     .no_display_binnum

        shr     eax, 16
        and     eax, 0xC03f
;     and   eax,0x3f
        push    eax
        and     eax, 0x3f
        mov     edi, esp
        add     edi, 4+64-1
        mov     ecx, eax
        mov     eax, ebx
        mov     ebx, 2
@@:
        xor     edx, edx
        call    division_64_bits
        div     ebx
        add     dl, 48
        mov     [edi], dl
        dec     edi
        loop    @b

        pop     eax
        call    normalize_number
        call    draw_num_text
        add     esp, 64
        popad
        ret
.no_display_binnum:

        add     esp, 64
        popad
        ret

normalize_number:
        test    ah, 0x80
        jz      .continue
        mov     ecx, 48
        and     eax, 0x3f
@@:
        inc     edi
        cmp     [edi], cl
        jne     .continue
        dec     eax
        cmp     eax, 1
        ja      @r
        mov     al, 1
.continue:
        and     eax, 0x3f
        ret

division_64_bits:
        test    [esp+1+4], byte 0x40
        jz      .continue
        push    eax
        mov     eax, ebp
        div     ebx
        mov     ebp, eax
        pop     eax
.continue:
        ret

draw_num_text:
        mov     esi, eax
        mov     edx, 64+4
        sub     edx, eax
        add     edx, esp
        mov     ebx, [esp+64+32-8+4]
; add window start x & y

        mov     ecx, [current_slot]
        mov     ecx, [ecx + APPDATA.window]

        mov     eax, [ecx + WDATA.box.left]
        add     eax, [ecx + WDATA.clientbox.left]
        shl     eax, 16
        add     eax, [ecx + WDATA.box.top]
        add     eax, [ecx + WDATA.clientbox.top]
        add     ebx, eax
        mov     ecx, [esp+64+32-12+4]
        mov     eax, [esp+64+8]         ; background color (if given)
        mov     edi, [esp+64+4]
        and     ecx, 5FFFFFFFh
        bt      ecx, 27
        jnc     @f
        mov     edi, eax
@@:
        jmp     dtext
;-----------------------------------------------------------------------------
align 4
sys_setup:
;  1 = roland mpu midi base , base io address
;  2 = keyboard   1, base kaybap 2, shift keymap, 9 country 1eng 2fi 3ger 4rus
;  3 = not used
;  4 = not used
;  5 = system language, 1eng 2fi 3ger 4rus
;  6 = not used
;  7 = not used
;  8 = not used
;  9 = not used
; 10 = not used
; 11 = enable lba read
; 12 = enable pci access
;-----------------------------------------------------------------------------
        and     [esp + SYSCALL_STACK.eax], dword 0
; F.21.1 - set MPU MIDI base port
        dec     ebx
        jnz     @f

        cmp     ecx, 0x100
        jb      @f

        mov     esi, 65535
        cmp     esi, ecx
        jb      @f

        mov     [midi_base], cx
        mov     word [mididp], cx
        inc     cx
        mov     word [midisp], cx
        ret
;--------------------------------------
@@:
; F.21.2 - set keyboard layout
        dec     ebx
        jnz     @f

        mov     eax, edx
; 1 = normal layout
        dec     ecx
        jnz     .shift

        mov     ebx, keymap
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.shift:
; 2 = layout at pressed Shift
        dec     ecx
        jnz     .alt

        mov     ebx, keymap_shift
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.alt:
; 3 = layout at pressed Alt
        dec     ecx
        jnz     .country

        mov     ebx, keymap_alt
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.country:
; country identifier
        sub     ecx, 6
        jnz     .error

        mov     word [keyboard], dx
        ret
;--------------------------------------
@@:
; F.21.5 - set system language
        sub     ebx, 3
        jnz     @f

        mov     [syslang], ecx
        ret
;--------------------------------------
@@:
; F.21.11 - enable/disable low-level access to HD
        and     ecx, 1
        sub     ebx, 6
        jnz     @f

        mov     [lba_read_enabled], ecx
        ret
;--------------------------------------
@@:
; F.21.12 - enable/disable low-level access to PCI
        dec     ebx
        jnz     .error

        mov     [pci_access_enabled], ecx
        ret
;--------------------------------------
.error:
        or      [esp + SYSCALL_STACK.eax], dword -1
        ret
;-----------------------------------------------------------------------------
align 4
sys_getsetup:
;  1 = roland mpu midi base , base io address
;  2 = keyboard   1, base kaybap 2, shift keymap, 9 country 1eng 2fi 3ger 4rus
;  3 = not used
;  4 = not used
;  5 = system language, 1eng 2fi 3ger 4rus
;  6 = not used
;  7 = not used
;  8 = not used
;  9 = get hs timer tic
; 10 = not used
; 11 = get the state "lba read"
; 12 = get the state "pci access"
;-----------------------------------------------------------------------------
; F.26.1 - get MPU MIDI base port
        dec     ebx
        jnz     @f

        movzx   eax, [midi_base]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
@@:
; F.26.2 - get keyboard layout
        dec     ebx
        jnz     @f

        mov     ebx, edx
        ; if given memory address belongs to kernel then error
        stdcall is_region_userspace, ebx, 128
        jnz     .addr_error
; 1 = normal layout
        dec     ecx
        jnz     .shift

        mov     eax, keymap
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.shift:
; 2 = layout with pressed Shift
        dec     ecx
        jnz     .alt

        mov     eax, keymap_shift
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.alt:
; 3 = layout with pressed Alt
        dec     ecx
        jne     .country

        mov     eax, keymap_alt
        mov     ecx, 128
        call    memmove
        ret
;--------------------------------------
.country:
; 9 = country identifier
        sub     ecx, 6
        jnz     .error

        movzx   eax, word [keyboard]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

.addr_error:    ; if given memory address is illegal
        or      dword [esp + SYSCALL_STACK.eax], -1
        ret
;--------------------------------------
@@:
; F.26.5 - get system language
        sub     ebx, 3
        jnz     @f

        mov     eax, [syslang]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
@@:
; F.26.9 - get the value of the time counter
        sub     ebx, 4
        jnz     @f

        mov     eax, [timer_ticks]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
@@:
; F.26.10 - get the time from kernel launch in nanoseconds
        dec     ebx
        jnz     @f

        call    get_clock_ns
        mov     [esp + SYSCALL_STACK.edx], edx
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
@@:
; F.26.11 - Find out whether low-level HD access is enabled
        dec     ebx
        jnz     @f

        mov     eax, [lba_read_enabled]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
@@:
; F.26.12 - Find out whether low-level PCI access is enabled
        dec     ebx
        jnz     .error

        mov     eax, [pci_access_enabled]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;--------------------------------------
.error:
        or      [esp + SYSCALL_STACK.eax], dword -1
        ret
;-----------------------------------------------------------------------------
get_timer_ticks:
        mov     eax, [timer_ticks]
        ret
;-----------------------------------------------------------------------------
iglobal
midi_base dw 0
endg

align 4
sys_midi:
        cmp     word [mididp], 0
        jnz     @f
        mov     [esp + SYSCALL_STACK.eax], 1
        ret
@@:
        and     [esp + SYSCALL_STACK.eax], 0
        dec     ebx
        jnz     .smn1
 ;    call setuart
@@:
        call    .is_output
        test    al, al
        jnz     @b
        mov     dx, word [midisp]
        mov     al, 0xff
        out     dx, al
@@:
        mov     dx, word [midisp]
        mov     al, 0xff
        out     dx, al
        call    .is_input
        test    al, al
        jnz     @b
        call    .get_mpu_in
        cmp     al, 0xfe
        jnz     @b
@@:
        call    .is_output
        test    al, al
        jnz     @b
        mov     dx, word [midisp]
        mov     al, 0x3f
        out     dx, al
        ret
.smn1:
        dec     ebx
        jnz     .ret
@@:
        call    .get_mpu_in
        call    .is_output
        test    al, al
        jnz     @b
        mov     al, bl
        call    .put_mpu_out
.ret:
        ret

.is_input:
        push    edx
        mov     dx, word [midisp]
        in      al, dx
        and     al, 0x80
        pop     edx
        ret

.is_output:
        push    edx
        mov     dx, word [midisp]
        in      al, dx
        and     al, 0x40
        pop     edx
        ret

.get_mpu_in:
        push    edx
        mov     dx, word [mididp]
        in      al, dx
        pop     edx
        ret

.put_mpu_out:
        push    edx
        mov     dx, word [mididp]
        out     dx, al
        pop     edx
        ret

;-----------------------------------------------------------------------------
sys_end:
; restore default cursor before killing
        pusha
        mov     ecx, [current_slot]
        mov     ecx, [ecx + APPDATA.window]
        call    restore_default_cursor_before_killing
        popa
;--------------------------------------
; kill all sockets this process owns
        pusha
        mov     edx, [current_slot]
        mov     edx, [edx + APPDATA.tid]
        call    socket_process_end
        popa
;--------------------------------------
        mov     ecx, [current_slot]
        mov     eax, [ecx + APPDATA.tls_base]
        test    eax, eax
        jz      @F

        stdcall user_free, eax
@@:

        mov     eax, [current_slot]
        mov     [eax + APPDATA.state], TSTATE_ZOMBIE
        call    wakeup_osloop

.waitterm:            ; wait here for termination
        call    change_task
        jmp     .waitterm
;------------------------------------------------------------------------------
align 4
; ecx - ptr WDATA
restore_default_cursor_before_killing:
        pushfd
        cli
        mov     eax, [def_cursor]
        mov     [ecx + WDATA.cursor], eax

        movzx   eax, word [MOUSE_Y]
        movzx   ebx, word [MOUSE_X]
        mov     eax, [d_width_calc_area + eax*4]

        add     eax, [_display.win_map]
        movzx   edx, byte [ebx + eax]
        shl     edx, BSF sizeof.WDATA
        mov     esi, [window_data + edx + WDATA.cursor]

        cmp     esi, [current_cursor]
        je      @f

        cmp     [_display.select_cursor], 0
        jz      @f

        stdcall [_display.select_cursor], esi
        mov     [current_cursor], esi
@@:
        mov     [redrawmouse_unconditional], 1
        call    wakeup_osloop
        popfd
        ret
;------------------------------------------------------------------------------
iglobal
align 4
sys_system_table:
        dd      sysfn_deactivate        ; 1 = deactivate window
        dd      sysfn_terminate         ; 2 = terminate thread
        dd      sysfn_activate          ; 3 = activate window
        dd      sysfn_getidletime       ; 4 = get idle time
        dd      sysfn_getcpuclock       ; 5 = get cpu clock
        dd      sysfn_saveramdisk       ; 6 = save ramdisk
        dd      sysfn_getactive         ; 7 = get active window
        dd      sysfn_sound_flag        ; 8 = get/set sound_flag
        dd      sysfn_shutdown          ; 9 = shutdown with parameter
        dd      sysfn_minimize          ; 10 = minimize window
        dd      sysfn_getdiskinfo       ; 11 = get disk subsystem info
        dd      undefined_syscall       ; 12 = get last pressed key. function removed. sysfn_lastkey
        dd      sysfn_getversion        ; 13 = get kernel version
        dd      sysfn_waitretrace       ; 14 = wait retrace
        dd      sysfn_centermouse       ; 15 = center mouse cursor
        dd      sysfn_getfreemem        ; 16 = get free memory size
        dd      sysfn_getallmem         ; 17 = get total memory size
        dd      sysfn_terminate2        ; 18 = terminate thread using PID
                                        ;                 instead of slot
        dd      sysfn_mouse_acceleration; 19 = set/get mouse acceleration
        dd      sysfn_meminfo           ; 20 = get extended memory info
        dd      sysfn_pid_to_slot       ; 21 = get slot number for pid
        dd      sysfn_min_rest_window   ; 22 = minimize and restore any window
        dd      sysfn_min_windows       ; 23 = minimize all windows
        dd      sysfn_set_screen_sizes  ; 24 = set screen sizes for Vesa

        dd      sysfn_zmodif            ; 25 = get/set window z modifier  ;Fantomer
sysfn_num = ($ - sys_system_table)/4
endg
;------------------------------------------------------------------------------
sys_system:
        dec     ebx
        cmp     ebx, sysfn_num
        jae     @f
        jmp     dword [sys_system_table + ebx*4]
@@:
        ret
;------------------------------------------------------------------------------
sysfn_shutdown:          ; 18.9 = system shutdown
        cmp     ecx, SYSTEM_SHUTDOWN
        jl      .exit_for_anyone
        cmp     ecx, SYSTEM_RESTART
        jg      .exit_for_anyone
        mov     [BOOT.shutdown_type], cl

        mov     eax, [thread_count]
        mov     [SYS_SHUTDOWN], al
        mov     [shutdown_processes], eax
        call    wakeup_osloop
        and     dword [esp + SYSCALL_STACK.eax], 0
.exit_for_anyone:
        ret
  uglobal
   shutdown_processes:
                       dd 0x0
  endg
;------------------------------------------------------------------------------
; in: eax -- APPDATA ptr
; out: Z/z -- is/not kernel thread
is_kernel_thread:
        mov     eax, [eax + APPDATA.process]
        cmp     eax, [SLOT_BASE + 2*sizeof.APPDATA + APPDATA.process]       ; OS
        ret
;------------------------------------------------------------------------------
sysfn_terminate:        ; 18.2 = TERMINATE
        push    ecx
        cmp     ecx, 2
        jb      .noprocessterminate
        mov     edx, [thread_count]
        cmp     ecx, edx
        ja      .noprocessterminate
        mov     eax, [thread_count]
        shl     ecx, BSF sizeof.APPDATA
        add     ecx, SLOT_BASE

        mov     edx, [ecx + APPDATA.tid]
        cmp     byte [ecx + APPDATA.state], TSTATE_FREE
        jz      .noprocessterminate
        push    eax
        mov     eax, ecx
        call    is_kernel_thread
        pop     eax
        jz      .noprocessterminate
        push    ecx edx
        mov     edx, ecx
        call    request_terminate
        pop     edx ecx
        test    eax, eax
        jz      .noprocessterminate
;--------------------------------------
; terminate all network sockets it used
        pusha
        mov     eax, edx     ;TODO: check function
        call    socket_process_end
        popa
;--------------------------------------
; restore default cursor before killing
        pusha
        mov     ecx, [esp+32]
        shl     ecx, BSF sizeof.WDATA
        add     ecx, window_data
        mov     eax, [def_cursor]
        cmp     [ecx + WDATA.cursor], eax
        je      @f
        call    restore_default_cursor_before_killing
@@:
        popa
;--------------------------------------
     ;call MEM_Heap_Lock      ;guarantee that process isn't working with heap
        mov     [ecx + APPDATA.state], TSTATE_ZOMBIE; clear possible i40's
        call    wakeup_osloop
     ;call MEM_Heap_UnLock

        cmp     edx, [application_table_owner]; clear app table stat
        jne     .noatsc
        call    unlock_application_table
.noatsc:
.noprocessterminate:
        add     esp, 4
        ret
;------------------------------------------------------------------------------
sysfn_terminate2:
        call    lock_application_table
        mov     eax, ecx
        call    pid_to_slot
        test    eax, eax
        jz      .not_found
        mov     ecx, eax
        cli
        call    sysfn_terminate
        call    unlock_application_table
        sti
        and     dword [esp + SYSCALL_STACK.eax], 0
        ret
.not_found:
        call    unlock_application_table
        or      dword [esp + SYSCALL_STACK.eax], -1
        ret
;------------------------------------------------------------------------------
sysfn_deactivate:         ; 18.1 = DEACTIVATE WINDOW
        cmp     ecx, 2
        jb      .nowindowdeactivate
        cmp     ecx, [thread_count]
        ja      .nowindowdeactivate

        movzx   esi, word [WIN_STACK + ecx*2]
        cmp     esi, 1
        je      .nowindowdeactivate ; already deactive

        mov     edi, ecx
        shl     edi, BSF sizeof.WDATA
        add     edi, window_data
        movzx   esi, word [WIN_STACK + ecx * 2]
        lea     esi, [WIN_POS + esi * 2]
        call    window._.window_deactivate
        call    syscall_display_settings.calculateScreen
        call    syscall_display_settings.redrawScreen
.nowindowdeactivate:
        ret
;------------------------------------------------------------------------------
sysfn_activate:         ; 18.3 = ACTIVATE WINDOW
        cmp     ecx, 2
        jb      .nowindowactivate
        cmp     ecx, [thread_count]
        ja      .nowindowactivate
;-------------------------------------
@@:
; If the window is captured and moved by the user,
; then you can't change the position in window stack!!!
        mov     al, [mouse.active_sys_window.action]
        and     al, WINDOW_MOVE_AND_RESIZE_FLAGS
        test    al, al
        jz      @f
        call    change_task
        jmp     @b
@@:
;-------------------------------------
        mov     [window_minimize], 2; restore window if minimized
        call    wakeup_osloop

        movzx   esi, word [WIN_STACK + ecx*2]
        cmp     esi, [thread_count]
        je      .nowindowactivate; already active

        mov     edi, ecx
        shl     edi, BSF sizeof.WDATA
        add     edi, window_data
        movzx   esi, word [WIN_STACK + ecx * 2]
        lea     esi, [WIN_POS + esi * 2]
        call    waredraw
.nowindowactivate:
        ret
;------------------------------------------------------------------------------
align 4
sysfn_zmodif:
;18,25,1 - get z_modif
;18,25,2 - set z_modif
;edx = -1(for current task) or TID
;esi(for 2) = new value z_modif
;return:
;1:   eax = z_modif
;2: eax=0(fail),1(success) for set z_modif

        cmp     edx, -1
        jne     @f
        mov     edx, [current_slot_idx]
     @@:
        cmp     edx, [thread_count]
        ja      .fail
        cmp     edx, 1
        je      .fail

        mov     eax, edx
        shl     edx, BSF sizeof.WDATA
        add     edx, window_data

        test    [edx + WDATA.fl_wstate], WSTATE_USED
        jz      .fail

        cmp     ecx, 1
        jnz     .set_zmod

        movzx   eax, [edx + WDATA.z_modif]
        jmp     .exit

.set_zmod:
        cmp     ecx, 2
        jnz     .fail

        mov     ebx, esi
        mov     esi, eax

        cmp     bl, ZPOS_ALWAYS_TOP
        jg      .fail

        mov     [edx + WDATA.z_modif], bl

        mov     eax, [edx + WDATA.box.left]
        mov     ebx, [edx + WDATA.box.top]
        mov     ecx, [edx + WDATA.box.width]
        mov     edx, [edx + WDATA.box.height]
        add     ecx, eax
        add     edx, ebx
        call    window._.set_screen
        call    window._.set_top_wnd
        call    window._.redraw_top_wnd

        shl     esi, BSF sizeof.WDATA
        mov     [esi + window_data + WDATA.fl_redraw], WSTATE_REDRAW


        mov     eax, 1
        jmp     .exit
.fail:
        xor     eax, eax
.exit:
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

;------------------------------------------------------------------------------
sysfn_getidletime:              ; 18.4 = GET IDLETIME
        mov     eax, [SLOT_BASE + sizeof.APPDATA + APPDATA.cpu_usage]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_getcpuclock:              ; 18.5 = GET TSC/SEC
        mov     eax, dword [cpu_freq]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
get_cpu_freq:
        mov     eax, dword [cpu_freq]
        mov     edx, dword [cpu_freq+4]
        ret
;  SAVE ramdisk to /hd/1/kolibri.img
;!!!!!!!!!!!!!!!!!!!!!!!!
   include 'blkdev/rdsave.inc'
;!!!!!!!!!!!!!!!!!!!!!!!!
;------------------------------------------------------------------------------
align 4
sysfn_getactive:        ; 18.7 = get active window
        mov     eax, [thread_count]
        movzx   eax, word [WIN_POS + eax*2]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_sound_flag:       ; 18.8 = get/set sound_flag
;     cmp  ecx,1
        dec     ecx
        jnz     .set_flag
        movzx   eax, byte [sound_flag]; get sound_flag
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.set_flag:
;     cmp  ecx,2
        dec     ecx
        jnz     .err
        xor     byte [sound_flag], 1
.err:
        ret
;------------------------------------------------------------------------------
sysfn_minimize:         ; 18.10 = minimize window
        mov     [window_minimize], 1
        call    wakeup_osloop
        ret
;------------------------------------------------------------------------------
align 4
sysfn_getdiskinfo:      ; 18.11 = get disk info table
        dec     ecx
        jnz     .exit
.small_table:
        stdcall is_region_userspace, edx, DRIVE_DATA_SIZE
        jnz     .exit
        mov     edi, edx
        mov     esi, DRIVE_DATA
        mov     ecx, DRIVE_DATA_SIZE ;10
        cld
        rep movsb
.exit:
        ret
;------------------------------------------------------------------------------
sysfn_getversion:       ; 18.13 = get kernel ID and version
        ; if given memory address belongs to kernel then error
        stdcall is_region_userspace, ecx, version_inf.size
        jnz     .addr_error

        mov     edi, ecx
        mov     esi, version_inf
        mov     ecx, version_inf.size
        rep movsb
        ret
.addr_error:    ; if given memory address is illegal
        mov     dword [esp + SYSCALL_STACK.eax], -1
        ret
;------------------------------------------------------------------------------
sysfn_waitretrace:     ; 18.14 = sys wait retrace
        ;wait retrace functions
        mov     edx, 0x3da
.loop:
        in      al, dx
        test    al, 1000b
        jz      .loop
        and     [esp + SYSCALL_STACK.eax], dword 0
        ret
;------------------------------------------------------------------------------
align 4
sysfn_centermouse:      ; 18.15 = mouse centered
        mov     eax, [_display.width]
        shr     eax, 1
        mov     [MOUSE_X], ax
        mov     eax, [_display.height]
        shr     eax, 1
        mov     [MOUSE_Y], ax
        call    wakeup_osloop
        xor     eax, eax
        and     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_mouse_acceleration:       ; 18.19 = set/get mouse features
        cmp     ecx, 8
        jnc     @f
        jmp     dword [.table + ecx*4]
.get_mouse_acceleration:
        xor     eax, eax
        mov     ax, [mouse_speed_factor]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.set_mouse_acceleration:
        mov     [mouse_speed_factor], dx
        ret
.get_mouse_delay:
        xor     eax, eax
        mov     al, [mouse_delay]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.set_mouse_delay:
        mov     [mouse_delay], dl
@@:
        ret
.set_pointer_position:
        cmp     dx, word[_display.height]
        jae     @b
        rol     edx, 16
        cmp     dx, word[_display.width]
        jae     @b
        mov     [MOUSE_X], edx
        mov     [mouse_active], 1
        jmp     wakeup_osloop
.set_mouse_button:
        mov     [BTN_DOWN], edx
        mov     [mouse_active], 1
        jmp     wakeup_osloop
.get_doubleclick_delay:
        xor     eax, eax
        mov     al, [mouse_doubleclick_delay]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.set_doubleclick_delay:
        mov     [mouse_doubleclick_delay], dl
        ret
align 4
.table:
dd      .get_mouse_acceleration
dd      .set_mouse_acceleration
dd      .get_mouse_delay
dd      .set_mouse_delay
dd      .set_pointer_position
dd      .set_mouse_button
dd      .get_doubleclick_delay
dd      .set_doubleclick_delay
;------------------------------------------------------------------------------
sysfn_getfreemem:
        mov     eax, [pg_data.pages_free]
        shl     eax, 2
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_getallmem:
        mov     eax, [MEM_AMOUNT]
        shr     eax, 10
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_pid_to_slot:
        mov     eax, ecx
        call    pid_to_slot
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_min_rest_window:
        pushad
        mov     eax, edx ; ebx - operating
        shr     ecx, 1
        jnc     @f
        call    pid_to_slot
@@:
        or      eax, eax ; eax - number of slot
        jz      .error
        cmp     eax, max_processes    ; varify maximal slot number
        ja      .error
        movzx   eax, word [WIN_STACK + eax*2]
        shr     ecx, 1
        jc      .restore
 ; .minimize:
        call    minimize_window
        jmp     .exit
.restore:
        call    restore_minimized_window
.exit:
        popad
        xor     eax, eax
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.error:
        popad
        xor     eax, eax
        dec     eax
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;------------------------------------------------------------------------------
sysfn_min_windows:
        call    minimize_all_window
        mov     [esp + SYSCALL_STACK.eax], eax
        call    change_task
        ret
;------------------------------------------------------------------------------
sysfn_set_screen_sizes:
        cmp     [SCR_MODE], word 0x13
        jbe     .exit

        cmp     [_display.select_cursor], select_cursor
        jne     .exit

        cmp     ecx, [display_width_standard]
        ja      .exit

        cmp     edx, [display_height_standard]
        ja      .exit

        pushfd
        cli
        mov     eax, ecx
        mov     ecx, [_display.lfb_pitch]
        mov     [_display.width], eax
        dec     eax
        mov     [_display.height], edx
        dec     edx
; eax - new Screen_Max_X
; edx - new Screen_Max_Y
        mov     [do_not_touch_winmap], 1
        call    set_screen
        mov     [do_not_touch_winmap], 0
        popfd
        call    change_task
.exit:
        ret
;------------------------------------------------------------------------------
uglobal
screen_workarea RECT
display_width_standard dd 0
display_height_standard dd 0
do_not_touch_winmap db 0
window_minimize db 0
sound_flag      db 0

endg

iglobal
version_inf:
        db 0,7,7,0  ; version 0.7.7.0
        db 0
.rev    dd __REV__
.size = $ - version_inf
endg
;------------------------------------------------------------------------------
align 4
sys_cachetodiskette:
        cmp     ebx, 1
        jb      .no_floppy_save
        cmp     ebx, 2
        ja      .no_floppy_save
        call    save_image
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.no_floppy_save:
        mov     [esp + SYSCALL_STACK.eax], dword 1
        ret
;------------------------------------------------------------------------------
align 4
sys_cpuusage:

;  RETURN:
;
;  +00 dword     process cpu usage
;  +04  word     position in windowing stack
;  +06  word     windowing stack value at current position (cpu nro)
;  +10 12 bytes  name
;  +22 dword     start in mem
;  +26 dword     used mem
;  +30 dword     PID , process idenfification number
;
        ; if given memory address belongs to kernel then error
        stdcall is_region_userspace, ebx, 0x4C
        jnz     .addr_error

        cmp     ecx, -1 ; who am I ?
        jne     .no_who_am_i
        mov     ecx, [current_slot_idx]
  .no_who_am_i:
        cmp     ecx, max_processes
        ja      .nofillbuf

; +4: word: position of the window of thread in the window stack
        mov     ax, [WIN_STACK + ecx * 2]
        mov     [ebx+4], ax
; +6: word: number of the thread slot, which window has in the window stack
;           position ecx (has no relation to the specific thread)
        mov     ax, [WIN_POS + ecx * 2]
        mov     [ebx+6], ax

        shl     ecx, BSF sizeof.APPDATA

; +0: dword: memory usage
        mov     eax, [SLOT_BASE + ecx + APPDATA.cpu_usage]
        mov     [ebx], eax
; +10: 11 bytes: name of the process
        push    ecx
        lea     eax, [SLOT_BASE + ecx + APPDATA.app_name]
        add     ebx, 10
        mov     ecx, 11
        call    memmove
        pop     ecx

; +22: address of the process in memory
; +26: size of used memory - 1
        push    edi
        lea     edi, [ebx+12]
        xor     eax, eax
        mov     edx, 0x100000*16
        cmp     ecx, 1 shl BSF sizeof.APPDATA
        je      .os_mem
        mov     edx, [SLOT_BASE + ecx + APPDATA.process]
        mov     edx, [edx + PROC.mem_used]
        mov     eax, std_application_base_address
.os_mem:
        stosd
        lea     eax, [edx-1]
        stosd

        mov     edx, [SLOT_BASE + ecx + APPDATA.window]

; +30: PID/TID
        mov     eax, [SLOT_BASE + ecx + APPDATA.tid]
        stosd

    ; window position and size
        push    esi
        lea     esi, [edx + WDATA.box]
        movsd
        movsd
        movsd
        movsd

    ; Process state (+50)
        movzx   eax, byte [SLOT_BASE + ecx + APPDATA.state]
        stosd

    ; Window client area box
        lea     esi, [edx + WDATA.clientbox]
        movsd
        movsd
        movsd
        movsd

    ; Window state
        mov     al, [edx + WDATA.fl_wstate]
        stosb

    ; Event mask (+71)
        mov     eax, dword [SLOT_BASE + ecx + APPDATA.event_mask]
        stosd

    ; Keyboard mode (+75)
        mov     al, byte [SLOT_BASE + ecx + APPDATA.keyboard_mode]
        stosb

        pop     esi
        pop     edi

.nofillbuf:
    ; return number of processes

        mov     eax, [thread_count]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

.addr_error:    ; if given memory address is illegal
        mov     dword [esp + SYSCALL_STACK.eax], -1
        ret


; redraw status
align 4
sys_redrawstat:
        cmp     ebx, 1
        jne     .no_widgets_away
        ; buttons away
        mov     ecx, [current_slot_idx]
.sys_newba2:
        mov     edi, [BTN_ADDR]
        cmp     [edi], dword 0  ; empty button list ?
        je      .end_of_buttons_away
        movzx   ebx, word [edi]
        inc     ebx
        mov     eax, edi
.sys_newba:
        dec     ebx
        jz      .end_of_buttons_away

        add     eax, 0x10
        cmp     cx, [eax]
        jnz     .sys_newba

        push    eax ebx ecx
        mov     ecx, ebx
        inc     ecx
        shl     ecx, 4
        mov     ebx, eax
        add     eax, 0x10
        call    memmove
        dec     dword [edi]
        pop     ecx ebx eax

        jmp     .sys_newba2

.end_of_buttons_away:
        ret

.no_widgets_away:

        cmp     ebx, 2
        jnz     .srl1

        mov     edx, [current_slot]      ; return whole screen draw area for this app
        mov     edx, [edx + APPDATA.window]
        mov     [edx + WDATA.draw_data.left], 0
        mov     [edx + WDATA.draw_data.top], 0
        mov     eax, [_display.width]
        dec     eax
        mov     [edx + WDATA.draw_data.right], eax
        mov     eax, [_display.height]
        dec     eax
        mov     [edx + WDATA.draw_data.bottom], eax

.srl1:
        ret

;ok - 100% work
;nt - not tested
;---------------------------------------------------------------------------------------------
;eax
;0 - task switch counter. Ret switch counter in eax. Block. ok.
;1 - change task. Ret nothing. Block. ok.
;2 - performance control
; ebx
; 0 - enable or disable (inversion) PCE flag on CR4 for rdmpc in user mode.
; returned new cr4 in eax. Ret cr4 in eax. Block. ok.
; 1 - is cache enabled. Ret cr0 in eax if enabled else zero in eax. Block. ok.
; 2 - enable cache. Ret 1 in eax. Ret nothing. Block. ok.
; 3 - disable cache. Ret 0 in eax. Ret nothing. Block. ok.
;eax
;3 - rdmsr. Counter in edx. (edx:eax) [esi:edi, edx] => [edx:esi, ecx]. Ret in ebx:eax. Block. ok.
;4 - wrmsr. Counter in edx. (edx:eax) [esi:edi, edx] => [edx:esi, ecx]. Ret in ebx:eax. Block. ok.
;---------------------------------------------------------------------------------------------
iglobal
align 4
sheduler:
        dd      sys_sheduler.00
        dd      change_task
        dd      sys_sheduler.02
        dd      sys_sheduler.03
        dd      sys_sheduler.04
endg
sys_sheduler:
;rewritten by <Lrz>  29.12.2009
        jmp     dword [sheduler + ebx*4]
;.shed_counter:
.00:
        mov     eax, [context_counter]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

.02:
;.perf_control:
        inc     ebx                     ;before ebx=2, ebx=3
        cmp     ebx, ecx                ;if ecx=3, ebx=3
        jz      cache_disable

        dec     ebx                     ;ebx=2
        cmp     ebx, ecx                ;
        jz      cache_enable            ;if ecx=2 and ebx=2

        dec     ebx                     ;ebx=1
        cmp     ebx, ecx
        jz      is_cache_enabled        ;if ecx=1 and ebx=1

        dec     ebx
        test    ebx, ecx                ;ebx=0 and ecx=0
        jz      modify_pce              ;if ecx=0

        ret

.03:
;.rdmsr_instr:
;now counter in ecx
;(edx:eax) esi:edi => edx:esi
        mov     eax, esi
        mov     ecx, edx
        rdmsr
        mov     [esp + SYSCALL_STACK.eax], eax
        mov     [esp + SYSCALL_STACK.ebx], edx           ;ret in ebx?
        ret

.04:
;.wrmsr_instr:
;now counter in ecx
;(edx:eax) esi:edi => edx:esi
        ; Fast Call MSR can't be destroy
        ; Но MSR_AMD_EFER можно изменять, т.к. в этом регистре лиш
        ; включаются/выключаются расширенные возможности
        cmp     edx, MSR_SYSENTER_CS
        je      @f
        cmp     edx, MSR_SYSENTER_ESP
        je      @f
        cmp     edx, MSR_SYSENTER_EIP
        je      @f
        cmp     edx, MSR_AMD_STAR
        je      @f

        mov     eax, esi
        mov     ecx, edx
        wrmsr
        ; mov   [esp + 32], eax
        ; mov   [esp + 20], edx ;ret in ebx?
@@:
        ret

cache_disable:
        mov     eax, cr0
        or      eax, 01100000_00000000_00000000_00000000b
        mov     cr0, eax
        wbinvd  ;set MESI
        ret

cache_enable:
        mov     eax, cr0
        and     eax, 10011111_11111111_11111111_11111111b
        mov     cr0, eax
        ret

is_cache_enabled:
        mov     eax, cr0
        and     eax, 01100000_00000000_00000000_00000000b
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

modify_pce:
        mov     eax, cr4
;       mov ebx,0
;       or  bx,100000000b ;pce
;       xor eax,ebx ;invert pce
        bts     eax, 8;pce=cr4[8]
        mov     cr4, eax
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;---------------------------------------------------------------------------------------------


iglobal
  cpustring db 'CPU',0
endg

uglobal
background_defined    db    0    ; diamond, 11.04.2006
endg
;-----------------------------------------------------------------------------
align 4
checkmisc:
        cmp     [ctrl_alt_del], 1
        jne     .nocpustart

        mov     ebp, cpustring
        call    fs_execute_from_sysdir

        mov     [ctrl_alt_del], 0
;--------------------------------------
align 4
.nocpustart:
        cmp     [mouse_active], 1
        jne     .mouse_not_active
        mov     [mouse_active], 0

        xor     edi, edi
        mov     ebx, window_data

        mov     ecx, [thread_count]
        movzx   eax, word [WIN_POS + ecx*2]     ; active window
        shl     eax, BSF sizeof.APPDATA
        push    eax

        movzx   eax, word [MOUSE_X]
        movzx   edx, word [MOUSE_Y]
;--------------------------------------
align 4
.set_mouse_event:
        add     edi, sizeof.APPDATA
        add     ebx, sizeof.WDATA
        test    [SLOT_BASE + edi + APPDATA.event_mask], EVM_MOUSE_FILTER
        jz      .pos_filter

        cmp     edi, [esp]                      ; skip if filtration active
        jne     .skip
;--------------------------------------
align 4
.pos_filter:
        test    [SLOT_BASE + edi + APPDATA.event_mask], EVM_CURSOR_FILTER
        jz      .set

        mov     esi, [ebx + WDATA.box.left]
        cmp     eax, esi
        jb      .skip
        add     esi, [ebx + WDATA.box.width]
        cmp     eax, esi
        ja      .skip

        mov     esi, [ebx + WDATA.box.top]
        cmp     edx, esi
        jb      .skip
        add     esi, [ebx + WDATA.box.height]
        cmp     edx, esi
        ja      .skip
;--------------------------------------
align 4
.set:
        or      [SLOT_BASE + edi + APPDATA.occurred_events], EVENT_MOUSE
;--------------------------------------
align 4
.skip:
        loop    .set_mouse_event

        pop     eax
;--------------------------------------
align 4
.mouse_not_active:
        cmp     [REDRAW_BACKGROUND], 0  ; background update ?
        jz      nobackgr

        cmp     [background_defined], 0
        jz      nobackgr
;--------------------------------------
align 4
backgr:
        mov     eax, [background_window + WDATA.draw_data.left]
        shl     eax, 16
        add     eax, [background_window + WDATA.draw_data.right]
        mov     [BG_Rect_X_left_right], eax ; [left]*65536 + [right]

        mov     eax, [background_window + WDATA.draw_data.top]
        shl     eax, 16
        add     eax, [background_window + WDATA.draw_data.bottom]
        mov     [BG_Rect_Y_top_bottom], eax ; [top]*65536 + [bottom]

        call    drawbackground
;        DEBUGF  1, "K : drawbackground\n"
;        DEBUGF  1, "K : backg x %x\n",[BG_Rect_X_left_right]
;        DEBUGF  1, "K : backg y %x\n",[BG_Rect_Y_top_bottom]
;--------- set event 5 start ----------
        push    ecx edi
        mov     edi, window_data
        mov     ecx, [thread_count]
;--------------------------------------
align 4
set_bgr_event:
        add     edi, sizeof.WDATA
        mov     eax, [BG_Rect_X_left_right]
        mov     edx, [BG_Rect_Y_top_bottom]
        cmp     [edi + WDATA.draw_bgr_x], 0
        jz      .set
.join:
        cmp     word [edi + WDATA.draw_bgr_x], ax
        jae     @f
        mov     word [edi + WDATA.draw_bgr_x], ax
@@:
        shr     eax, 16
        cmp     word [edi + WDATA.draw_bgr_x + 2], ax
        jbe     @f
        mov     word [edi + WDATA.draw_bgr_x + 2], ax
@@:
        cmp     word [edi + WDATA.draw_bgr_y], dx
        jae     @f
        mov     word [edi + WDATA.draw_bgr_y], dx
@@:
        shr     edx, 16
        cmp     word [edi + WDATA.draw_bgr_y+2], dx
        jbe     @f
        mov     word [edi + WDATA.draw_bgr_y+2], dx
@@:
        jmp     .common
.set:
        mov     [edi + WDATA.draw_bgr_x], eax
        mov     [edi + WDATA.draw_bgr_y], edx
.common:
        mov     eax, [edi + WDATA.thread]
        test    eax, eax
        jz      @f
        or      [eax + APPDATA.occurred_events], EVENT_BACKGROUND
@@:
        loop    set_bgr_event
        pop     edi ecx
;--------- set event 5 stop -----------
        dec     [REDRAW_BACKGROUND]     ; got new update request?
        jnz     backgr

        xor     eax, eax
        mov     [background_window + WDATA.draw_data.left], eax
        mov     [background_window + WDATA.draw_data.top], eax
        mov     [background_window + WDATA.draw_data.right], eax
        mov     [background_window + WDATA.draw_data.bottom], eax
;--------------------------------------
align 4
nobackgr:
; system shutdown request
        cmp     [SYS_SHUTDOWN], byte 0
        je      noshutdown

        mov     edx, [shutdown_processes]

        cmp     [SYS_SHUTDOWN], dl
        jne     noshutdown

        lea     ecx, [edx-1]
        mov     edx, SLOT_BASE + sizeof.APPDATA*2 ;OS_BASE+0x3040
        jecxz   no_mark_system_shutdown
;--------------------------------------
align 4
markz:
        push    ecx edx
        cmp     [edx + APPDATA.state], TSTATE_FREE
        jz      .nokill
        cmp     [edx + APPDATA.process], sys_proc
        jz      .nokill
        call    request_terminate
        jmp     .common
.nokill:
        dec     byte [SYS_SHUTDOWN]
        xor     eax, eax
.common:
        pop     edx ecx
        test    eax, eax
        jz      @f
        mov     [edx + APPDATA.state], TSTATE_ZOMBIE
@@:
        add     edx, sizeof.APPDATA
        loop    markz
        call    wakeup_osloop
;--------------------------------------
align 4
@@:
no_mark_system_shutdown:
        dec     byte [SYS_SHUTDOWN]
        je      system_shutdown
;--------------------------------------
align 4
noshutdown:
        mov     eax, [thread_count]           ; termination
        mov     ebx, SLOT_BASE + sizeof.APPDATA + APPDATA.state
        mov     esi, 1
;--------------------------------------
align 4
newct:
        mov     cl, [ebx]
        cmp     cl, TSTATE_ZOMBIE
        jz      .terminate

        cmp     cl, TSTATE_TERMINATING
        jnz     .noterminate
.terminate:
        pushad
        push    esi
        mov     ecx, dword[ebx - APPDATA.state + APPDATA.window]
        call    restore_default_cursor_before_killing

        pop     esi
        call    terminate
        popad
        cmp     byte [SYS_SHUTDOWN], 0
        jz      .noterminate
        dec     byte [SYS_SHUTDOWN]
        je      system_shutdown

.noterminate:
        add     ebx, sizeof.APPDATA
        inc     esi
        dec     eax
        jnz     newct
        ret
;-----------------------------------------------------------------------------
align 4
; eax - ptr to WDATA
redrawscreen:
; eax , if process window_data base is eax, do not set flag/limits

        pushad
        push    eax

;;;         mov   ebx,2
;;;         call  delay_hs

         ;mov   ecx,0               ; redraw flags for apps
        xor     ecx, ecx
;--------------------------------------
align 4
newdw2:
        inc     ecx
        push    ecx

        mov     eax, ecx
        shl     eax, BSF sizeof.WDATA
        add     eax, window_data

        cmp     eax, [esp+4]
        je      not_this_task
                                   ; check if window in redraw area
        mov     edi, eax

        cmp     ecx, 1             ; limit for background
        jz      bgli

        mov     eax, [esp+4]        ;if upper in z-position - no redraw
        test    eax, eax
        jz      @f
        mov     al, [eax + WDATA.z_modif]
        cmp     [edi + WDATA.z_modif], al
        jg      ricino
      @@:

        mov     eax, [edi + WDATA.box.left]
        mov     ebx, [edi + WDATA.box.top]

        cmp     ebx, [draw_limits.bottom] ; ecx = area y end     ebx = window y start
        jae     ricino

        cmp     eax, [draw_limits.right] ; ecx = area x end     eax = window x start
        jae     ricino

        mov     eax, [edi + WDATA.box.left]
        mov     ebx, [edi + WDATA.box.top]
        mov     ecx, [edi + WDATA.box.width]
        mov     edx, [edi + WDATA.box.height]
        add     ecx, eax
        add     edx, ebx

        mov     eax, [draw_limits.top]  ; eax = area y start     edx = window y end
        cmp     edx, eax
        jb      ricino

        mov     eax, [draw_limits.left]  ; eax = area x start     ecx = window x end
        cmp     ecx, eax
        jb      ricino
;--------------------------------------
align 4
bgli:
        cmp     dword[esp], 1  ; check index in window_data array, 1 - idle
        jnz     .az

        cmp     [REDRAW_BACKGROUND], 0
        jz      .az

        mov     dl, 0
        mov     ebx, [draw_limits.left]
        cmp     ebx, [edi + WDATA.draw_data.left]
        jae     @f

        mov     [edi + WDATA.draw_data.left], ebx
        mov     dl, 1
;--------------------------------------
align 4
@@:
        mov     ebx, [draw_limits.top]
        cmp     ebx, [edi + WDATA.draw_data.top]
        jae     @f

        mov     [edi + WDATA.draw_data.top], ebx
        mov     dl, 1
;--------------------------------------
align 4
@@:
        mov     ebx, [draw_limits.right]
        cmp     ebx, [edi + WDATA.draw_data.right]
        jbe     @f

        mov     [edi + WDATA.draw_data.right], ebx
        mov     dl, 1
;--------------------------------------
align 4
@@:
        mov     ebx, [draw_limits.bottom]
        cmp     ebx, [edi + WDATA.draw_data.bottom]
        jbe     @f

        mov     [edi + WDATA.draw_data.bottom], ebx
        mov     dl, 1
;--------------------------------------
align 4
@@:
        add     [REDRAW_BACKGROUND], dl
        call    wakeup_osloop
        jmp     newdw8
;--------------------------------------
align 4
.az:
        mov     ebx, [draw_limits.left]        ; set limits
        mov     [edi + WDATA.draw_data.left], ebx
        mov     ebx, [draw_limits.top]
        mov     [edi + WDATA.draw_data.top], ebx
        mov     ebx, [draw_limits.right]
        mov     [edi + WDATA.draw_data.right], ebx
        mov     ebx, [draw_limits.bottom]
        mov     [edi + WDATA.draw_data.bottom], ebx

        cmp     dword [esp], 1  ; check idle thread
        jne     nobgrd
        inc     [REDRAW_BACKGROUND]
        call    wakeup_osloop
;--------------------------------------
align 4
newdw8:
nobgrd:
;--------------------------------------
        push    edi ebp
        mov     edi, [esp+8]
        cmp     edi, 1
        je      .found

        mov     eax, [draw_limits.left]
        mov     ebx, [draw_limits.top]
        mov     ecx, [draw_limits.right]
        sub     ecx, eax
        test    ecx, ecx
        jz      .not_found

        mov     edx, [draw_limits.bottom]
        sub     edx, ebx
        test    edx, edx
        jz      .not_found

; eax - x, ebx - y
; ecx - size x, edx - size y
        add     ebx, edx
;--------------------------------------
align 4
.start_y:
        push    ecx
;--------------------------------------
align 4
.start_x:
        add     eax, ecx
        mov     ebp, [d_width_calc_area + ebx*4]
        add     ebp, [_display.win_map]
        movzx   ebp, byte[eax+ebp] ; get value for current point
        cmp     ebp, edi
        jne     @f

        pop     ecx
        jmp     .found
;--------------------------------------
align 4
@@:
        sub     eax, ecx

        dec     ecx
        jns     .start_x

        pop     ecx
        dec     ebx
        dec     edx
        jns     .start_y
;--------------------------------------
align 4
.not_found:
        pop     ebp edi
        jmp     ricino
;--------------------------------------
align 4
.found:
        pop     ebp edi

        mov     [edi + WDATA.fl_redraw], WSTATE_REDRAW  ; mark as redraw
;--------------------------------------
align 4
ricino:
not_this_task:
        pop     ecx

        cmp     ecx, [thread_count]
        jle     newdw2

        pop     eax
        popad
        ret
;-----------------------------------------------------------------------------
align 4
calculatebackground:   ; background
        mov     edi, [_display.win_map]              ; set os to use all pixels
        mov     eax, 0x01010101
        mov     ecx, [_display.win_map_size]
        shr     ecx, 2
        rep stosd
        mov     byte[background_window + WDATA.z_modif], ZPOS_DESKTOP
        mov     [REDRAW_BACKGROUND], 0
        ret
;-----------------------------------------------------------------------------
uglobal
  imax    dd 0x0
endg
;-----------------------------------------------------------------------------
align 4
delay_ms:     ; delay in 1/1000 sec
        pushad

        cmp     [hpet_base], 0
        jz      .no_hpet
        mov     eax, esi
        mov     edx, 1_000_000 ; ms to ns
        mul     edx
        mov     ebx, edx
        mov     ecx, eax

        push    ecx
        call    get_clock_ns
        pop     ecx
        mov     edi, edx
        mov     esi, eax
.wait:
        push    ecx
        call    get_clock_ns
        pop     ecx
        sub     eax, esi
        sbb     edx, edi
        sub     eax, ecx
        sbb     edx, ebx
        jc      .wait
        jmp     .done

.no_hpet:
        mov     ecx, esi
        ; <CPU clock fix by Sergey Kuzmin aka Wildwest>
        imul    ecx, 33941
        shr     ecx, 9
        ; </CPU clock fix>

        in      al, 0x61
        and     al, 0x10
        mov     ah, al
        cld

.cnt1:
        in      al, 0x61
        and     al, 0x10
        cmp     al, ah
        jz      .cnt1

        mov     ah, al
        loop    .cnt1

.done:
        popad
        ret
;-----------------------------------------------------------------------------
align 4
set_app_param:
        mov     edi, [current_slot]
        xchg    ebx, [edi + APPDATA.event_mask] ; set new event mask
        mov     [esp + SYSCALL_STACK.eax], ebx  ; return old mask value
        ret
;-----------------------------------------------------------------------------

; this is for syscall
proc delay_hs_unprotected
        call    unprotect_from_terminate
        call    delay_hs
        call    protect_from_terminate
        ret
endp

if 1
align 4
delay_hs:     ; delay in 1/100 secs
; ebx = delay time
        pushad
        push    ebx
        xor     esi, esi
        mov     ecx, MANUAL_DESTROY
        call    create_event
        test    eax, eax
        jz      .done

        mov     ebx, edx
        mov     ecx, [esp]
        push    edx
        push    eax
        call    wait_event_timeout
        pop     eax
        pop     ebx
        call    destroy_event
.done:
        add     esp, 4
        popad
        ret

else

align 4
delay_hs:     ; delay in 1/100 secs
; ebx = delay time
        push    ecx
        push    edx

        mov     edx, [timer_ticks]
;--------------------------------------
align 4
.newtic:
        mov     ecx, [timer_ticks]
        sub     ecx, edx
        cmp     ecx, ebx
        jae     .zerodelay

        call    change_task

        jmp     .newtic
;--------------------------------------
align 4
.zerodelay:
        pop     edx
        pop     ecx
        ret
end if

;-----------------------------------------------------------------------------
align 16        ;very often call this subrutine
memmove:       ; memory move in bytes
; eax = from
; ebx = to
; ecx = no of bytes
        test    ecx, ecx
        jle     .ret

        push    esi edi ecx

        mov     edi, ebx
        mov     esi, eax

        test    ecx, not 11b
        jz      @f

        push    ecx
        shr     ecx, 2
        rep movsd
        pop     ecx
        and     ecx, 11b
        jz      .finish
;--------------------------------------
align 4
@@:
        rep movsb
;--------------------------------------
align 4
.finish:
        pop     ecx edi esi
;--------------------------------------
align 4
.ret:
        ret
;-----------------------------------------------------------------------------

; in: eax = port
;     ebp = subfunction
;          0 - set access
;          1 - clear access
; out: not return value
align 4
set_io_access_rights:
        push    edi eax
        mov     edi, tss._io_map_0

        test    ebp, ebp         ; enable access - ebp = 0
        jnz     .siar1

        btr     [edi], eax
        pop     eax edi
        ret
.siar1:
        bts     [edi], eax      ; disable access - ebp = 1
        pop     eax edi
        ret

align 4
; @brief ReservePortArea and FreePortArea
; @param edx number end arrea of ports (include last number of port)
; @param ecx number start arrea of ports
; @param ebx sub function 0 - reserve, 1 - free
; @param eax 46 - number function
; @returns  eax = 0 - succesful eax = 1 - error
syscall_reserveportarea:        ; ReservePortArea and FreePortArea

        call    r_f_port_area
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

;reserve/free group of ports
;  * eax = 46 - number function
;  * ebx = 0 - reserve, 1 - free
;  * ecx = number start arrea of ports
;  * edx = number end arrea of ports (include last number of port)
;Return value:
;  * eax = 0 - succesful
;  * eax = 1 - error
;  * The system has reserve this ports:
;    0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (include last number of port).
;destroys eax,ebx, ebp
r_f_port_area:

        test    ebx, ebx
        jnz     .free_port_area

        cmp     ecx, edx      ; beginning > end ?
        ja      .err
        cmp     edx, 65536    ;test ebx, not 0xffff
        jae     .err
        mov     eax, [RESERVED_PORTS]
        test    eax, eax      ; no reserved areas ?
        je      .rpal2
        cmp     eax, 255      ; max reserved
        jae     .err
 .rpal3:
        mov     ebx, eax
        shl     ebx, 4   ;16 byte is sizeof item in RESERVED_PORTS table
        add     ebx, RESERVED_PORTS
        cmp     ecx, [ebx+8]
        ja      .rpal4
        cmp     edx, [ebx+4]
        jae     .err
 .rpal4:
        dec     eax
        jnz     .rpal3
        jmp     .rpal2
.err:
        xor     eax, eax
        inc     eax
        ret

   .rpal2:
     ; enable port access at port IO map
        pushad                        ; start enable io map
        mov     eax, ecx
        xor     ebp, ebp               ; enable - eax = port
        cli
.new_port_access:
        call    set_io_access_rights

        inc     eax
        cmp     eax, edx
        jbe     .new_port_access

        sti
        popad                         ; end enable io map

        mov     eax, [RESERVED_PORTS]
        inc     eax
        mov     [RESERVED_PORTS], eax
        shl     eax, 4
        add     eax, RESERVED_PORTS
        mov     ebx, [current_slot]
        mov     ebx, [ebx + APPDATA.tid]
        mov     [eax], ebx   ; tid
        mov     [eax+4], ecx ;start port
        mov     [eax+8], edx ;finish port

        xor     eax, eax
        ret

.free_port_area:

        mov     eax, [RESERVED_PORTS]; no reserved areas ?
        test    eax, eax
        jz      .frpal2
        mov     ebx, [current_slot]
        mov     ebx, [ebx + APPDATA.tid]
   .frpal3:
        mov     edi, eax
        shl     edi, 4
        add     edi, RESERVED_PORTS
        cmp     ebx, [edi]
        jne     .frpal4
        cmp     ecx, [edi+4]
        jne     .frpal4
        cmp     edx, [edi+8]
        jne     .frpal4
        jmp     .frpal1
   .frpal4:
        dec     eax
        jnz     .frpal3
   .frpal2:
        inc     eax
        ret
   .frpal1:
        push    ecx
        mov     ecx, 256
        sub     ecx, eax
        shl     ecx, 4
        mov     esi, edi
        add     esi, 16
        cld
        rep movsb

        dec     dword [RESERVED_PORTS]
;disable port access at port IO map
                        ; start disable io map
        pop     eax     ;start port
        ;cmp     edx, 65536
        ;jge     no_mask_io

        xor     ebp, ebp
        inc     ebp
.new_port_access_disable:           ; disable - eax = port
        call    set_io_access_rights

        inc     eax
        cmp     eax, edx
        jbe     .new_port_access_disable
                                    ; end disable io map
        xor     eax, eax
        ret
;-----------------------------------------------------------------------------
align 4
drawbackground:
        cmp     [BgrDrawMode], dword 1
        jne     .bgrstr
        call    vesa20_drawbackground_tiled
        call    __sys_draw_pointer
        ret
;--------------------------------------
align 4
.bgrstr:
        call    vesa20_drawbackground_stretch
        call    __sys_draw_pointer
        ret
;-----------------------------------------------------------------------------
align 4
syscall_putimage:                       ; PutImage
; add check pointer
        push    ecx
        mov     ax, cx
        shr     ecx, 16
        imul    eax, ecx
        lea     eax, [eax*3]
        stdcall is_region_userspace, ebx, eax
        pop     ecx
        jnz     sys_putimage.exit

sys_putimage:
        test    ecx, 0x80008000
        jnz     .exit
        test    ecx, 0x0000FFFF
        jz      .exit
        test    ecx, 0xFFFF0000
        jnz     @f
;--------------------------------------
align 4
.exit:
        ret
;--------------------------------------
align 4
@@:
        mov     edi, [current_slot]
        mov     edi, [edi + APPDATA.window]
        add     dx, word[edi + WDATA.clientbox.top]
        rol     edx, 16
        add     dx, word[edi + WDATA.clientbox.left]
        rol     edx, 16
;--------------------------------------
align 4
.forced:
        push    ebp esi 0
        mov     ebp, putimage_get24bpp
        mov     esi, putimage_init24bpp
;--------------------------------------
align 4
sys_putimage_bpp:
        call    vesa20_putimage
        pop     ebp esi ebp
        ret
;        jmp     [draw_pointer]
;-----------------------------------------------------------------------------
align 4
sys_putimage_palette:
; ebx = pointer to image
; ecx = [xsize]*65536 + [ysize]
; edx = [xstart]*65536 + [ystart]
; esi = number of bits per pixel, must be 8, 24 or 32
; edi = pointer to palette
; ebp = row delta
; check pointer
        push    ecx esi
        mov     ax, cx
        shr     ecx, 16
        imul    eax, ecx
;        imul    eax, esi ; eax*count bit in 1 pixel
;        shr     eax, 3
        stdcall is_region_userspace, ebx, eax
        pop     esi ecx
        jnz     sys_putimage.exit

        mov     eax, [current_slot]
        mov     eax, [eax + APPDATA.window]
        add     dx, word [eax + WDATA.clientbox.top]
        rol     edx, 16
        add     dx, word [eax + WDATA.clientbox.left]
        rol     edx, 16
;--------------------------------------
align 4
.forced:
        cmp     esi, 1
        jnz     @f
        push    edi
        mov     eax, [edi+4]
        sub     eax, [edi]
        push    eax
        push    dword [edi]
        push    0ffffff80h
        mov     edi, esp
        call    put_mono_image
        add     esp, 12
        pop     edi
        ret
;--------------------------------------
align 4
@@:
        cmp     esi, 2
        jnz     @f
        push    edi
        push    0ffffff80h
        mov     edi, esp
        call    put_2bit_image
        pop     eax
        pop     edi
        ret
;--------------------------------------
align 4
@@:
        cmp     esi, 4
        jnz     @f
        push    edi
        push    0ffffff80h
        mov     edi, esp
        call    put_4bit_image
        pop     eax
        pop     edi
        ret
;--------------------------------------
align 4
@@:
        push    ebp esi ebp
        cmp     esi, 8
        jnz     @f
        mov     ebp, putimage_get8bpp
        mov     esi, putimage_init8bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        cmp     esi, 9
        jnz     @f
        mov     ebp, putimage_get9bpp
        mov     esi, putimage_init9bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        cmp     esi, 15
        jnz     @f
        mov     ebp, putimage_get15bpp
        mov     esi, putimage_init15bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        cmp     esi, 16
        jnz     @f
        mov     ebp, putimage_get16bpp
        mov     esi, putimage_init16bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        cmp     esi, 24
        jnz     @f
        mov     ebp, putimage_get24bpp
        mov     esi, putimage_init24bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        cmp     esi, 32
        jnz     @f
        mov     ebp, putimage_get32bpp
        mov     esi, putimage_init32bpp
        jmp     sys_putimage_bpp
;--------------------------------------
align 4
@@:
        pop     ebp esi ebp
        ret
;-----------------------------------------------------------------------------
align 4
put_mono_image:
        push    ebp esi ebp
        mov     ebp, putimage_get1bpp
        mov     esi, putimage_init1bpp
        jmp     sys_putimage_bpp
;-----------------------------------------------------------------------------
align 4
put_2bit_image:
        push    ebp esi ebp
        mov     ebp, putimage_get2bpp
        mov     esi, putimage_init2bpp
        jmp     sys_putimage_bpp
;-----------------------------------------------------------------------------
align 4
put_4bit_image:
        push    ebp esi ebp
        mov     ebp, putimage_get4bpp
        mov     esi, putimage_init4bpp
        jmp     sys_putimage_bpp
;-----------------------------------------------------------------------------
align 4
putimage_init24bpp:
        lea     eax, [eax*3]
putimage_init8bpp:
putimage_init9bpp:
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get24bpp:
        movzx   eax, byte [esi+2]
        shl     eax, 16
        mov     ax, [esi]
        add     esi, 3
        ret     4
;-----------------------------------------------------------------------------
align 16
putimage_get8bpp:
        movzx   eax, byte [esi]
        push    edx
        mov     edx, [esp+8]
        mov     eax, [edx + eax*4]
        pop     edx
        inc     esi
        ret     4
;-----------------------------------------------------------------------------
align 16
putimage_get9bpp:
        lodsb
        mov     ah, al
        shl     eax, 8
        mov     al, ah
        ret     4
;-----------------------------------------------------------------------------
align 4
putimage_init1bpp:
        add     eax, ecx
        push    ecx
        add     eax, 7
        add     ecx, 7
        shr     eax, 3
        shr     ecx, 3
        sub     eax, ecx
        pop     ecx
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get1bpp:
        push    edx
        mov     edx, [esp+8]
        mov     al, [edx]
        add     al, al
        jnz     @f
        lodsb
        adc     al, al
@@:
        mov     [edx], al
        sbb     eax, eax
        and     eax, [edx+8]
        add     eax, [edx+4]
        pop     edx
        ret     4
;-----------------------------------------------------------------------------
align 4
putimage_init2bpp:
        add     eax, ecx
        push    ecx
        add     ecx, 3
        add     eax, 3
        shr     ecx, 2
        shr     eax, 2
        sub     eax, ecx
        pop     ecx
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get2bpp:
        push    edx
        mov     edx, [esp+8]
        mov     al, [edx]
        mov     ah, al
        shr     al, 6
        shl     ah, 2
        jnz     .nonewbyte
        lodsb
        mov     ah, al
        shr     al, 6
        shl     ah, 2
        add     ah, 1
.nonewbyte:
        mov     [edx], ah
        mov     edx, [edx+4]
        movzx   eax, al
        mov     eax, [edx + eax*4]
        pop     edx
        ret     4
;-----------------------------------------------------------------------------
align 4
putimage_init4bpp:
        add     eax, ecx
        push    ecx
        add     ecx, 1
        inc     eax      ;add   eax, 1
        shr     ecx, 1
        shr     eax, 1
        sub     eax, ecx
        pop     ecx
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get4bpp:
        push    edx
        mov     edx, [esp+8]
        add     byte [edx], 80h
        jc      @f
        movzx   eax, byte [edx+1]
        mov     edx, [edx+4]
        and     eax, 0x0F
        mov     eax, [edx + eax*4]
        pop     edx
        ret     4
@@:
        movzx   eax, byte [esi]
        add     esi, 1
        mov     [edx+1], al
        shr     eax, 4
        mov     edx, [edx+4]
        mov     eax, [edx + eax*4]
        pop     edx
        ret     4
;-----------------------------------------------------------------------------
align 4
putimage_init32bpp:
        shl     eax, 2
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get32bpp:
        lodsd
        ret     4
;-----------------------------------------------------------------------------
align 4
putimage_init15bpp:
putimage_init16bpp:
        add     eax, eax
        ret
;-----------------------------------------------------------------------------
align 16
putimage_get15bpp:
; 0RRRRRGGGGGBBBBB -> 00000000RRRRR000GGGGG000BBBBB000
        push    ecx edx
        movzx   eax, word [esi]
        add     esi, 2
        mov     ecx, eax
        mov     edx, eax
        and     eax, 0x1F
        and     ecx, 0x1F shl 5
        and     edx, 0x1F shl 10
        shl     eax, 3
        shl     ecx, 6
        shl     edx, 9
        or      eax, ecx
        or      eax, edx
        pop     edx ecx
        ret     4
;-----------------------------------------------------------------------------
align 16
putimage_get16bpp:
; RRRRRGGGGGGBBBBB -> 00000000RRRRR000GGGGGG00BBBBB000
        push    ecx edx
        movzx   eax, word [esi]
        add     esi, 2
        mov     ecx, eax
        mov     edx, eax
        and     eax, 0x1F
        and     ecx, 0x3F shl 5
        and     edx, 0x1F shl 11
        shl     eax, 3
        shl     ecx, 5
        shl     edx, 8
        or      eax, ecx
        or      eax, edx
        pop     edx ecx
        ret     4
;-----------------------------------------------------------------------------
;align 4
; eax x beginning
; ebx y beginning
; ecx x end
        ; edx y end
; edi color
;__sys_drawbar:
;        mov     esi, [current_slot]
;        mov     esi, [esi + APPDATA.window]
;        add     eax, [esi + WDATA.clientbox.left]
;        add     ecx, [esi + WDATA.clientbox.left]
;        add     ebx, [esi + WDATA.clientbox.top]
;        add     edx, [esi + WDATA.clientbox.top]
;--------------------------------------
;align 4
;.forced:
;        call    vesa20_drawbar
;        call    [draw_pointer]
;        ret
;-----------------------------------------------------------------------------
if used _rdtsc
_rdtsc:
        bt      [cpu_caps], CAPS_TSC
        jnc     .ret_rdtsc
        rdtsc
        ret
   .ret_rdtsc:
        mov     edx, 0xffffffff
        mov     eax, 0xffffffff
        ret
end if

sys_msg_board_str:

        pushad
   @@:
        cmp     [esi], byte 0
        je      @f
        mov     ebx, 1
        movzx   ecx, byte [esi]
        call    sys_msg_board
        inc     esi
        jmp     @b
   @@:
        popad
        ret

sys_msg_board_byte:
; in: al = byte to display
; out: nothing
; destroys: nothing
        pushad
        mov     ecx, 2
        shl     eax, 24
        jmp     @f

sys_msg_board_word:
; in: ax = word to display
; out: nothing
; destroys: nothing
        pushad
        mov     ecx, 4
        shl     eax, 16
        jmp     @f

sys_msg_board_dword:
; in: eax = dword to display
; out: nothing
; destroys: nothing
        pushad
        mov     ecx, 8
@@:
        push    ecx
        rol     eax, 4
        push    eax
        and     al, 0xF
        cmp     al, 10
        sbb     al, 69h
        das
        mov     cl, al
        xor     ebx, ebx
        inc     ebx
        call    sys_msg_board
        pop     eax
        pop     ecx
        loop    @b
        popad
        ret

msg_board_data_size = 65536 ; Must be power of two

uglobal
msg_board_data  rb  msg_board_data_size
msg_board_count dd  ?
endg

iglobal
msg_board_pos   dd  42*6*65536+10 ; for printing debug output on the screen
endg

sys_msg_board:
; ebx=1 -> write, cl = byte to write
; ebx=2 -> read, ecx=0 -> no data, ecx=1 -> data in al
        push    eax ebx
        mov     eax, ebx
        mov     ebx, ecx
        mov     ecx, [msg_board_count]
        cmp     eax, 1
        jne     .read

if defined debug_com_base
        push    dx ax
@@: ; wait for empty transmit register
        mov     dx, debug_com_base+5
        in      al, dx
        test    al, 1 shl 5
        jz      @r
        mov     dx, debug_com_base      ; Output the byte
        mov     al, bl
        out     dx, al
        pop     ax dx
end if

        mov     [msg_board_data+ecx], bl
        cmp     byte [debug_direct_print], 1
        jnz     .end
        pusha
        lea     edx, [msg_board_data+ecx]
        mov     ecx, 0x40FFFFFF
        mov     ebx, [msg_board_pos]
        mov     edi, 1
        mov     esi, edi ;1
        call    dtext
        popa
        add     word [msg_board_pos+2], 6
        cmp     word [msg_board_pos+2], 105*6
        jnc     @f
        cmp     bl, 10
        jnz     .end
@@:
        mov     word [msg_board_pos+2], 42*6
        add     word [msg_board_pos], 10
        mov     eax, [_display.height]
        sub     eax, 10
        cmp     ax, word [msg_board_pos]
        jnc     @f
        mov     word [msg_board_pos], 10
@@:
        pusha
        mov     eax, [msg_board_pos]
        movzx   ebx, ax
        shr     eax, 16
        mov     edx, 105*6
        xor     ecx, ecx
        mov     edi, 1
        mov     esi, 9
@@:
        call    hline
        inc     ebx
        dec     esi
        jnz     @b
        popa
.end:
        inc     ecx
        and     ecx, msg_board_data_size - 1
        mov     [msg_board_count], ecx
.ret:
        pop     ebx eax
        ret

.read:
        cmp     eax, 2
        jne     .ret
        add     esp, 8  ; returning data in ebx and eax, so no need to restore them
        test    ecx, ecx
        jnz     @f
        mov     [esp + SYSCALL_STACK.eax], ecx
        mov     [esp + SYSCALL_STACK.ebx], ecx
        ret
@@:
        mov     eax, msg_board_data+1
        mov     ebx, msg_board_data
        movzx   edx, byte [ebx]
        call    memmove
        dec     [msg_board_count]
        mov     [esp + SYSCALL_STACK.eax], edx
        mov     [esp + SYSCALL_STACK.ebx], 1
        ret

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; 61 sys function.                                                ;;
;; in eax=61,ebx in [1..3]                                         ;;
;; out eax                                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
iglobal
align 4
f61call:
           dd sys_gs.1   ; resolution
           dd sys_gs.2   ; bits per pixel
           dd sys_gs.3   ; bytes per scanline
endg


align 4

sys_gs:                         ; direct screen access
        dec     ebx
        cmp     ebx, 2
        ja      .not_support
        jmp     dword [f61call + ebx*4]
.not_support:
        or      [esp + SYSCALL_STACK.eax], dword -1
        ret


.1:                             ; resolution
        mov     eax, [_display.width]
        shl     eax, 16
        mov     ax, word [_display.height]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.2:                             ; bits per pixel
        mov     eax, [_display.bits_per_pixel]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
.3:                             ; bytes per scanline
        mov     eax, [_display.lfb_pitch]
        mov     [esp + SYSCALL_STACK.eax], eax
        ret

align 4
syscall_getscreensize:                  ; GetScreenSize
        mov     ax, word [_display.width]
        dec     ax
        shl     eax, 16
        mov     ax, word [_display.height]
        dec     ax
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;-----------------------------------------------------------------------------
align 4
syscall_cdaudio:
; ECX - position of CD/DVD-drive
; from 0=Primary Master to 3=Secondary Slave for first IDE contr.
; from 4=Primary Master to 7=Secondary Slave for second IDE contr.
; from 8=Primary Master to 11=Secondary Slave for third IDE contr.
        cmp     ecx, 11
        ja      .exit

        mov     eax, ecx
        shr     eax, 2
        lea     eax, [eax*5]
        mov     al, [eax + DRIVE_DATA + 1]

        push    ecx ebx
        mov     ebx, ecx
        and     ebx, 11b
        shl     ebx, 1
        mov     cl, 6
        sub     cl, bl
        shr     al, cl
        test    al, 2 ; it's not an ATAPI device
        pop     ebx ecx

        jz      .exit

        cmp     ebx, 4
        je      .eject

        cmp     ebx, 5
        je      .load
;--------------------------------------
.exit:
        ret
;--------------------------------------
.load:
        call    .reserve
        call    LoadMedium
        jmp     .free
;--------------------------------------
.eject:
        call    .reserve
        call    clear_CD_cache
        call    allow_medium_removal
        call    EjectMedium
        jmp     .free
;--------------------------------------
.reserve:
        call    reserve_cd

        mov     ebx, ecx
        inc     ebx
        mov     [cdpos], ebx

        mov     eax, ecx
        shr     eax, 1
        and     eax, 1
        inc     eax
        mov     [ChannelNumber], al
        mov     eax, ecx
        and     eax, 1
        mov     [DiskNumber], al
        call    reserve_cd_channel
        ret
;--------------------------------------
.free:
        call    free_cd_channel
        and     [cd_status], 0
        ret
;-----------------------------------------------------------------------------
align 4
syscall_getpixel_WinMap:                       ; GetPixel WinMap
        xor     eax, eax

        cmp     ebx, [_display.width]
        jae     .store
        cmp     ecx, [_display.height]
        jae     .store
;--------------------------------------
        mov     eax, [d_width_calc_area + ecx*4]
        add     eax, [_display.win_map]
        movzx   eax, byte[eax+ebx]        ; get value for current point
;--------------------------------------
align 4
.store:
        mov     [esp + SYSCALL_STACK.eax], eax
        ret
;-----------------------------------------------------------------------------
align 4
syscall_getpixel:                       ; GetPixel
        mov     ecx, [_display.width]
        xor     edx, edx
        mov     eax, ebx
        div     ecx
        mov     ebx, edx
        xchg    eax, ebx
        and     ecx, 0xFBFFFFFF  ;negate 0x04000000 use mouseunder area
        call    dword [GETPIXEL]; eax - x, ebx - y
        mov     [esp + SYSCALL_STACK.eax], ecx
        ret
;-----------------------------------------------------------------------------
align 4
syscall_getarea:
;eax = 36
;ebx = pointer to bufer for img BBGGRRBBGGRR...
;ecx = [size x]*65536 + [size y]
;edx = [start x]*65536 + [start y]
        pushad
        mov     edi, ebx
        mov     eax, edx
        shr     eax, 16
        mov     ebx, edx
        and     ebx, 0xffff
        dec     eax
        dec     ebx
     ; eax - x, ebx - y
        mov     edx, ecx

        shr     ecx, 16
        and     edx, 0xffff
        mov     esi, ecx
     ; ecx - size x, edx - size y

        mov     ebp, edx
        lea     ebp, [ebp*3]
        imul    ebp, esi
        stdcall is_region_userspace, edi, ebp
        jnz     .exit

        mov     ebp, edx
        dec     ebp
        lea     ebp, [ebp*3]

        imul    ebp, esi

        mov     esi, ecx
        dec     esi
        lea     esi, [esi*3]

        add     ebp, esi
        add     ebp, edi

        add     ebx, edx
;--------------------------------------
align 4
.start_y:
        push    ecx edx
;--------------------------------------
align 4
.start_x:
        push    eax ebx ecx
        add     eax, ecx

        and     ecx, 0xFBFFFFFF  ;negate 0x04000000 use mouseunder area
        call    dword [GETPIXEL]; eax - x, ebx - y

        mov     [ebp], cx
        shr     ecx, 16
        mov     [ebp+2], cl

        pop     ecx ebx eax
        sub     ebp, 3
        dec     ecx
        jnz     .start_x
        pop     edx ecx
        dec     ebx
        dec     edx
        jnz     .start_y

.exit:
        popad
        ret
;-----------------------------------------------------------------------------

align 4
syscall_threads:                        ; CreateThreads
;
;   ecx=thread entry point
;   edx=thread stack pointer
;
; on return : eax = pid
        xor     ebx, ebx
        call    new_sys_threads

        mov     [esp + SYSCALL_STACK.eax], eax
        ret

;------------------------------------------------------------------------------
align 4
calculate_fast_getting_offset_for_WinMapAddress:
; calculate data area for fast getting offset to _WinMapAddress
        xor     eax, eax
        mov     ecx, [_display.height]
        mov     edi, d_width_calc_area
        cld
@@:
        stosd
        add     eax, [_display.width]
        dec     ecx
        jnz     @r
        ret
;------------------------------------------------------------------------------
align 4
calculate_fast_getting_offset_for_LFB:
; calculate data area for fast getting offset to LFB
        xor     eax, eax
        mov     ecx, [_display.height]
        mov     edi, BPSLine_calc_area
        cld
@@:
        stosd
        add     eax, [_display.lfb_pitch]
        dec     ecx
        jnz     @r
        ret
;------------------------------------------------------------------------------
align 4
set_screen:
; in:
; eax - new Screen_Max_X
; ecx - new BytesPerScanLine
; edx - new Screen_Max_Y

        pushfd
        cli

        mov     [_display.lfb_pitch], ecx

        mov     [screen_workarea.right], eax
        mov     [screen_workarea.bottom], edx

        push    ebx
        push    esi
        push    edi

        pushad

        cmp     [do_not_touch_winmap], 1
        je      @f

        stdcall kernel_free, [_display.win_map]

        mov     eax, [_display.width]
        mul     [_display.height]
        mov     [_display.win_map_size], eax

        stdcall kernel_alloc, eax
        mov     [_display.win_map], eax
        test    eax, eax
        jz      .epic_fail
; store for f.18.24
        mov     eax, [_display.width]
        mov     [display_width_standard], eax

        mov     eax, [_display.height]
        mov     [display_height_standard], eax
@@:
        call    calculate_fast_getting_offset_for_WinMapAddress
; for Qemu or non standart video cards
; Unfortunately [BytesPerScanLine] does not always
;                             equal to [_display.width] * [ScreenBPP] / 8
        call    calculate_fast_getting_offset_for_LFB
        popad

        call    repos_windows
        xor     eax, eax
        xor     ebx, ebx
        mov     ecx, [_display.width]
        mov     edx, [_display.height]
        dec     ecx
        dec     edx
        call    calculatescreen
        pop     edi
        pop     esi
        pop     ebx

        popfd
        ret

.epic_fail:
        hlt                     ; Houston, we've had a problem

; --------------- APM ---------------------
uglobal
apm_entry       dp      0
apm_vf          dd      0
endg

align 4
sys_apm:
        xor     eax, eax
        cmp     word [apm_vf], ax       ; Check APM BIOS enable
        jne     @f
        inc     eax
        or      dword [esp + 44], eax   ; error
        add     eax, 7
        mov     dword [esp + SYSCALL_STACK.eax], eax   ; 32-bit protected-mode interface not supported
        ret

@@:
;       xchg    eax, ecx
;       xchg    ebx, ecx

        cmp     dx, 3
        ja      @f
        and     [esp + 44], byte 0xfe    ; emulate func 0..3 as func 0
        mov     eax, [apm_vf]
        mov     [esp + SYSCALL_STACK.eax], eax
        shr     eax, 16
        mov     [esp + SYSCALL_STACK.ecx], eax
        ret

@@:

        mov     esi, [master_tab+(OS_BASE shr 20)]
        xchg    [master_tab], esi
        push    esi
        mov     edi, cr3
        mov     cr3, edi                ;flush TLB

        call    pword [apm_entry]       ;call APM BIOS

        xchg    eax, [esp]
        mov     [master_tab], eax
        mov     eax, cr3
        mov     cr3, eax
        pop     eax

        mov     [esp + SYSCALL_STACK.edi], edi
        mov     [esp + SYSCALL_STACK.esi], esi
        mov     [esp + SYSCALL_STACK.ebx], ebx
        mov     [esp + SYSCALL_STACK.edx], edx
        mov     [esp + SYSCALL_STACK.ecx], ecx
        mov     [esp + SYSCALL_STACK.eax], eax
        setc    al
        and     [esp + 44], byte 0xfe
        or      [esp + 44], al
        ret
; -----------------------------------------

align 4
undefined_syscall:                      ; Undefined system call
        mov     [esp + SYSCALL_STACK.eax], dword -1
        ret

align 4
; @brief Check if given memory region lays in lower 2gb (userspace memory) or not
; @param base Base address of region
; @param len Lenght of region
; @return ZF = 1 if region in userspace memory,
;         ZF = 0 otherwise
proc is_region_userspace stdcall, base:dword, len:dword
        push    eax
        mov     eax, [base]

        cmp     eax, OS_BASE-1
        ja      @f              ; zf

        add     eax, [len]
        jc      @f              ; zf
        cmp     eax, OS_BASE
        ja      @f              ; zf

        cmp     eax, eax        ; ZF
@@:
        pop     eax
        ret
endp

align 4
; @brief Check whether given string lays in userspace memory, i.e. below OS_BASE
; @param base Base address of string
; @return ZF = 1 if string in userspace memory,
;         zf = 0 otherwise
proc is_string_userspace stdcall, base:dword
        push    eax ecx edi
        xor     eax, eax
        mov     edi, [base]

        mov     ecx, OS_BASE-1
        sub     ecx, edi
        jb      .done           ; zf
        inc     ecx
        cmp     ecx, 0x10000    ; don't allow strings larger than 64k?
        jbe     @f
        mov     ecx, 0x10000
@@:
        repnz scasb
.done:
        pop     edi ecx eax
        ret
endp

if ~ lang eq sp
diff16 "end of .text segment",0,$
end if

include "data32.inc"

__REV__ = __REV

if ~ lang eq sp
diff16 "end of kernel code",0,$
end if