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kolibrios/kernel/trunk/core/v86.inc

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* V86 manager * support of drives visible by BIOS through V86 mode * shutdown fixes * background redraw fixes * when booting from CD/DVD, load all floppy by tracks, not only used sectors git-svn-id: svn://kolibrios.org@709 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-02-04 16:31:59 +01:00
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Virtual-8086 mode manager
; diamond, 2007, 2008
DEBUG_SHOW_IO = 0
struc V86_machine
{
; page directory
.pagedir dd ?
; translation table: V86 address -> flat linear address
.pages dd ?
; mutex to protect all data from writing by multiple threads at one time
.mutex dd ?
; i/o permission map
.iopm dd ?
.size = $
}
virtual at 0
V86_machine V86_machine
end virtual
; Create V86 machine
; in: nothing
; out: eax = handle (pointer to struc V86_machine)
; eax = NULL => failure
; destroys: ebx, ecx, edx (due to malloc)
v86_create:
; allocate V86_machine structure
mov eax, V86_machine.size
call malloc
test eax, eax
jz .fail
; initialize mutex
and dword [eax+V86_machine.mutex], 0
; allocate tables
mov ebx, eax
; We allocate 4 pages.
; First is main page directory for V86 mode.
; Second page:
; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
; second half is for V86-to-linear translation.
; Third and fourth are for I/O permission map.
push 4000h
call kernel_alloc
test eax, eax
jz .fail2
mov [ebx+V86_machine.pagedir], eax
push edi eax
mov edi, eax
add eax, 1800h
mov [ebx+V86_machine.pages], eax
; initialize tables
mov ecx, 2000h/4
xor eax, eax
rep stosd
mov [ebx+V86_machine.iopm], edi
dec eax
mov ecx, 2000h/4
rep stosd
pop eax
; page directory: first entry is page table...
mov edi, eax
add eax, 1000h
push eax
call get_pg_addr
or al, PG_UW
stosd
; ...and also copy system page tables
; thx to Serge, system is located at high addresses
add edi, (OS_BASE shr 20) - 4
push esi
mov esi, (OS_BASE shr 20) + sys_pgdir
mov ecx, 0x80000000 shr 22
rep movsd
pop esi
; now V86 specific: initialize known addresses in first Mb
pop eax edi
; first page - BIOS data (shared between all machines!)
; physical address = 0x2f0000
; linear address = BOOT_VAR = OS_BASE + 0x2f0000
mov dword [eax], (BOOT_VAR - OS_BASE) or 111b
mov dword [eax+800h], BOOT_VAR
; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
; physical address = 0x9F000
; linear address = 0x8009F000
mov dword [eax+0x9E*4], 0x9E000 or 111b
mov dword [eax+0x9E*4+800h], 0x9E000 + OS_BASE
mov dword [eax+0x9F*4], 0x9F000 or 111b
mov dword [eax+0x9F*4+800h], 0x9F000 + OS_BASE
; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
; physical address = 0xC0000
; linear address = 0x800C0000
mov ecx, 0xC0
@@:
mov edx, ecx
shl edx, 12
push edx
or edx, 101b
mov [eax+ecx*4], edx
pop edx
add edx, OS_BASE
mov [eax+ecx*4+0x800], edx
inc cl
jnz @b
mov eax, ebx
ret
.fail2:
mov eax, ebx
call free
.fail:
xor eax, eax
ret
; Destroy V86 machine
; in: eax = handle
; out: nothing
; destroys: eax, ebx, ecx, edx (due to free)
v86_destroy:
push eax
stdcall kernel_free, [eax+V86_machine.pagedir]
pop eax
jmp free
; Translate V86-address to linear address
; in: eax=V86 address
; esi=handle
; out: eax=linear address
; destroys: nothing
v86_get_lin_addr:
push ecx edx
mov ecx, eax
mov edx, [esi+V86_machine.pages]
shr ecx, 12
and eax, 0xFFF
add eax, [edx+ecx*4] ; atomic operation, no mutex needed
pop edx ecx
ret
; Sets linear address for V86-page
; in: eax=linear address (must be page-aligned)
; ecx=V86 page (NOT address!)
; esi=handle
; out: nothing
; destroys: nothing
v86_set_page:
push eax ebx
mov ebx, [esi+V86_machine.pagedir]
mov [ebx+ecx*4+0x1800], eax
call get_pg_addr
or al, 111b
mov [ebx+ecx*4+0x1000], eax
pop ebx eax
ret
; Allocate memory in V86 machine
; in: eax=size (in bytes)
; esi=handle
; out: eax=V86 address, para-aligned (0x10 multiple)
; destroys: nothing
; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ᠭ<EFBFBD>!!!
;v86_alloc:
; push ebx ecx edx edi
; lea ebx, [esi+V86_machine.mutex]
; call wait_mutex
; add eax, 0x1F
; shr eax, 4
; mov ebx, 0x1000 ; start with address 0x1000 (second page)
; mov edi, [esi+V86_machine.tables]
;.l:
; mov ecx, ebx
; shr ecx, 12
; mov edx, [edi+0x1000+ecx*4] ; get linear address
; test edx, edx ; page allocated?
; jz .unalloc
; mov ecx, ebx
; and ecx, 0xFFF
; add edx, ecx
; cmp dword [edx], 0 ; free block?
; jnz .n
; cmp dword [edx+4],
; and [esi+V86_machine.mutex], 0
; pop edi edx ecx ebx
; ret
uglobal
sys_v86_machine dd ?
endg
; Called from kernel.asm at first stages of loading
; Initialize system V86 machine (used to simulate BIOS int 13h)
init_sys_v86:
call v86_create
mov [sys_v86_machine], eax
test eax, eax
jz .ret
mov byte [BOOT_VAR + 0x500], 0xCD
mov byte [BOOT_VAR + 0x501], 0x13
mov byte [BOOT_VAR + 0x502], 0xF4
mov byte [BOOT_VAR + 0x503], 0xCD
mov byte [BOOT_VAR + 0x504], 0x10
mov byte [BOOT_VAR + 0x505], 0xF4
mov esi, eax
mov ebx, [eax+V86_machine.pagedir]
mov dword [ebx+0x9C*4+0x1000], 0x9C000 or 111b
mov dword [ebx+0x9C*4+0x1800], OS_BASE + 0x9C000
mov dword [ebx+0x9D*4+0x1000], 0x9D000 or 111b
mov dword [ebx+0x9D*4+0x1800], OS_BASE + 0x9D000
if ~DEBUG_SHOW_IO
; allow access to all ports
mov ecx, [esi+V86_machine.iopm]
xor eax, eax
mov edi, ecx
mov ecx, 10000h/8/4
rep stosd
end if
.ret:
ret
struc v86_regs
{
; don't change the order, it is important
.edi dd ?
.esi dd ?
.ebp dd ?
dd ? ; ignored
.ebx dd ?
.edx dd ?
.ecx dd ?
.eax dd ?
.eip dd ?
.cs dd ?
.eflags dd ? ; VM flag must be set!
.esp dd ?
.ss dd ?
.es dd ?
.ds dd ?
.fs dd ?
.gs dd ?
.size = $
}
virtual at 0
v86_regs v86_regs
end virtual
; Run V86 machine
; in: ebx -> registers for V86 (two structures: in and out)
; esi = handle
; ecx = expected end address (CS:IP)
; edx = IRQ to hook or -1 if not required
; out: structure pointed to by ebx is filled with new values
; eax = 1 - exception has occured, cl contains code
; eax = 2 - access to disabled i/o port, ecx contains port address
; eax = 3 - IRQ is already hooked by another VM
; destroys: nothing
v86_start:
pushad
cli
mov ecx, [CURRENT_TASK]
shl ecx, 8
add ecx, SLOT_BASE
mov eax, [esi+V86_machine.iopm]
call get_pg_addr
inc eax
push dword [ecx+APPDATA.io_map]
push dword [ecx+APPDATA.io_map+4]
mov dword [ecx+APPDATA.io_map], eax
mov dword [page_tabs + (tss._io_map_0 shr 10)], eax
add eax, 0x1000
mov dword [ecx+APPDATA.io_map+4], eax
mov dword [page_tabs + (tss._io_map_1 shr 10)], eax
push [ecx+APPDATA.dir_table]
push [ecx+APPDATA.saved_esp0]
mov [ecx+APPDATA.saved_esp0], esp
mov [tss._esp0], esp
mov eax, [esi+V86_machine.pagedir]
call get_pg_addr
mov [ecx+APPDATA.dir_table], eax
mov cr3, eax
; mov [irq_tab+5*4], my05
; We do not enable interrupts, because V86 IRQ redirector assumes that
; machine is running
; They will be enabled by IRET.
; sti
mov eax, esi
sub esp, v86_regs.size
mov esi, ebx
mov edi, esp
mov ecx, v86_regs.size/4
rep movsd
cmp edx, -1
jz .noirqhook
uglobal
v86_irqhooks rd 16*2
endg
cmp [v86_irqhooks+edx*8], 0
jz @f
cmp [v86_irqhooks+edx*8], eax
jz @f
mov esi, v86_irqerr
call sys_msg_board_str
inc [v86_irqhooks+edx*8+4]
mov eax, 3
jmp v86_exc_c.exit
@@:
mov [v86_irqhooks+edx*8], eax
inc [v86_irqhooks+edx*8+4]
.noirqhook:
popad
iretd
; It is only possible to leave virtual-8086 mode by faulting to
; a protected-mode interrupt handler (typically the general-protection
; exception handler, which in turn calls the virtual 8086-mode monitor).
v86_debug_exc:
pushad
xor eax, eax
mov dr6, eax
mov bl, 1
jmp v86_exc_c
v86_page_fault:
add esp, 4
pushad
mov bl, 14
jmp v86_exc_c
v86_except_16:
pushad
mov bl, 16
jmp v86_exc_c
v86_except_19:
pushad
mov bl, 19
iglobal
v86_exc_str1 db 'V86 : unexpected exception ',0
v86_exc_str2 db ' at ',0
v86_exc_str3 db ':',0
v86_exc_str4 db 13,10,'V86 : faulted code:',0
v86_exc_str5 db ' (unavailable)',0
v86_newline db 13,10,0
v86_io_str1 db 'V86 : access to disabled i/o port ',0
v86_io_byte db ' (byte)',13,10,0
v86_io_word db ' (word)',13,10,0
v86_io_dword db ' (dword)',13,10,0
v86_irqerr db 'V86 : IRQ already hooked',13,10,0
endg
v86_exc_c:
mov ax, app_data
mov ds, ax
mov es, ax
; Did we all that we have wanted to do?
mov eax, [esp+v86_regs.size+10h+18h]
cmp word [esp+v86_regs.eip], ax
jnz @f
shr eax, 16
cmp word [esp+v86_regs.cs], ax
jz .done
@@:
; Various system events, which must be handled, result in #GP
cmp bl, 13
jnz .nogp
; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error
cmp word [esp+v86_regs.eip+2], 0
jnz .nogp
; Otherwise we can safely access byte at CS:IP
; (because it is #GP, not #PF handler)
; <EFBFBD>᫨ <EFBFBD><EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>嫮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>᪫<EFBFBD>祭<EFBFBD><EFBFBD> ⮫쪮 <EFBFBD><EFBFBD>-<EFBFBD><EFBFBD> <EFBFBD>⥭<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>⮢ <EFBFBD><EFBFBD><EFBFBD><EFBFBD>,
; <EFBFBD><EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> 㦥 <EFBFBD>嫮<EFBFBD><EFBFBD>⠫<EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD>뫮 <EFBFBD><EFBFBD> <EFBFBD><EFBFBD> #GP
movzx esi, word [esp+v86_regs.cs]
shl esi, 4
add esi, [esp+v86_regs.eip]
lodsb
cmp al, 0xCD ; int xx command = CD xx
jz .handle_int
cmp al, 0xCF
jz .handle_iret
cmp al, 0xF3
jz .handle_rep
cmp al, 0xEC
jz .handle_in
cmp al, 0xED
jz .handle_in_word
cmp al, 0xEE
jz .handle_out
cmp al, 0xEF
jz .handle_out_word
cmp al, 0xE4
jz .handle_in_imm
cmp al, 0xE6
jz .handle_out_imm
cmp al, 0x9C
jz .handle_pushf
cmp al, 0x9D
jz .handle_popf
cmp al, 0xFA
jz .handle_cli
cmp al, 0xFB
jz .handle_sti
cmp al, 0x66
jz .handle_66
jmp .nogp
.handle_int:
cmp word [esp+v86_regs.eip], 0xFFFF
jae .nogp
xor eax, eax
lodsb
; call sys_msg_board_byte
; simulate INT command
; N.B. It is possible that some checks need to be corrected,
; but at least in case of normal execution the code works.
.simulate_int:
cmp word [esp+v86_regs.esp], 6
jae @f
mov bl, 12 ; #SS exception
jmp .nogp
@@:
movzx edx, word [esp+v86_regs.ss]
shl edx, 4
push eax
movzx eax, word [esp+4+v86_regs.esp]
sub eax, 6
add edx, eax
mov eax, edx
mov esi, [esp+4+v86_regs.size+10h+4]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14 ; #PF exception
jmp .nogp
@@:
lea eax, [edx+5]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14 ; #PF exception
jmp .nogp
@@:
sub word [esp+4+v86_regs.esp], 6
mov eax, [esp+4+v86_regs.eip]
inc eax
inc eax
mov word [edx], ax
mov eax, [esp+4+v86_regs.cs]
mov word [edx+2], ax
mov eax, [esp+4+v86_regs.eflags]
mov word [edx+4], ax
pop eax
mov cx, [eax*4]
mov word [esp+v86_regs.eip], cx
mov cx, [eax*4+2]
mov word [esp+v86_regs.cs], cx
; note that interrupts will be disabled globally at IRET
and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags
; continue V86 execution
popad
iretd
.handle_iret:
cmp word [esp+v86_regs.esp], 0x10000 - 6
jbe @f
mov bl, 12
jmp .nogp
@@:
movzx edx, word [esp+v86_regs.ss]
shl edx, 4
movzx eax, word [esp+v86_regs.esp]
add edx, eax
mov eax, edx
mov esi, [esp+v86_regs.size+10h+4]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14
jmp .nogp
@@:
lea eax, [edx+5]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14
jmp .nogp
@@:
mov ax, [edx]
mov word [esp+v86_regs.eip], ax
mov ax, [edx+2]
mov word [esp+v86_regs.cs], ax
mov ax, [edx+4]
mov word [esp+v86_regs.eflags], ax
add word [esp+v86_regs.esp], 6
popad
iretd
.handle_pushf:
cmp word [esp+v86_regs.esp], 1
jnz @f
mov bl, 12
jmp .nogp
@@:
movzx edx, word [esp+v86_regs.ss]
shl edx, 4
mov eax, [esp+v86_regs.esp]
sub eax, 2
movzx eax, ax
add edx, eax
mov eax, edx
mov esi, [esp+v86_regs.size+10h+4]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14 ; #PF exception
jmp .nogp
@@:
lea eax, [edx+1]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14
jmp .nogp
@@:
sub word [esp+v86_regs.esp], 2
mov eax, [esp+v86_regs.eflags]
mov [edx], ax
inc word [esp+v86_regs.eip]
popad
iretd
.handle_popf:
cmp word [esp+v86_regs.esp], 0xFFFF
jnz @f
mov bl, 12
jmp .nogp
@@:
movzx edx, word [esp+v86_regs.ss]
shl edx, 4
movzx eax, word [esp+v86_regs.esp]
add edx, eax
mov eax, edx
mov esi, [esp+v86_regs.size+10h+4]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14 ; #PF exception
jmp .nogp
@@:
lea eax, [edx+1]
call v86_get_lin_addr
cmp eax, 0x1000
jae @f
mov bl, 14
jmp .nogp
@@:
mov ax, [edx]
mov word [esp+v86_regs.eflags], ax
add word [esp+v86_regs.esp], 2
inc word [esp+v86_regs.eip]
popad
iretd
.handle_cli:
and byte [esp+v86_regs.eflags+1], not 2
inc word [esp+v86_regs.eip]
popad
iretd
.handle_sti:
or byte [esp+v86_regs.eflags+1], 2
inc word [esp+v86_regs.eip]
popad
iretd
.handle_rep:
cmp word [esp+v86_regs.eip], 0xFFFF
jae .nogp
lodsb
cmp al, 6Eh
jz .handle_rep_outsb
jmp .nogp
.handle_rep_outsb:
.handle_in:
.handle_out:
.invalid_io_byte:
movzx ebx, word [esp+v86_regs.edx]
mov ecx, 1
jmp .invalid_io
.handle_in_imm:
.handle_out_imm:
cmp word [esp+v86_regs.eip], 0xFFFF
jae .nogp
lodsb
movzx ebx, al
mov ecx, 1
jmp .invalid_io
.handle_66:
cmp word [esp+v86_regs.eip], 0xFFFF
jae .nogp
lodsb
cmp al, 0xEF
jz .handle_out_dword
cmp al, 0xED
jz .handle_in_dword
jmp .nogp
.handle_in_word:
.handle_out_word:
movzx ebx, word [esp+v86_regs.edx]
mov ecx, 2
jmp .invalid_io
.handle_in_dword:
.handle_out_dword:
.invalid_io_dword:
movzx ebx, word [esp+v86_regs.edx]
mov ecx, 4
.invalid_io:
mov esi, v86_io_str1
call sys_msg_board_str
mov eax, ebx
call sys_msg_board_dword
mov esi, v86_io_byte
cmp ecx, 1
jz @f
mov esi, v86_io_word
cmp ecx, 2
jz @f
mov esi, v86_io_dword
@@:
call sys_msg_board_str
if DEBUG_SHOW_IO
mov edx, ebx
mov ebx, 200
call delay_hs
mov esi, [esp+v86_regs.size+10h+4]
mov eax, [esi+V86_machine.iopm]
@@:
btr [eax], edx
inc edx
loop @b
popad
iretd
else
mov eax, 2
jmp .exit
end if
.nogp:
mov esi, v86_exc_str1
call sys_msg_board_str
mov al, bl
call sys_msg_board_byte
mov esi, v86_exc_str2
call sys_msg_board_str
mov ax, [esp+32+4]
call sys_msg_board_word
mov esi, v86_exc_str3
call sys_msg_board_str
mov ax, [esp+32]
call sys_msg_board_word
mov esi, v86_exc_str4
call sys_msg_board_str
mov ecx, 8
movzx edx, word [esp+32+4]
shl edx, 4
add edx, [esp+32]
@@:
mov esi, [esp+v86_regs.size+10h+4]
mov eax, edx
call v86_get_lin_addr
cmp eax, 0x1000
jb .nopage
mov esi, v86_exc_str3-2
call sys_msg_board_str
mov al, [edx]
call sys_msg_board_byte
inc edx
loop @b
jmp @f
.nopage:
mov esi, v86_exc_str5
call sys_msg_board_str
@@:
mov esi, v86_newline
call sys_msg_board_str
mov eax, 1
jmp .exit
.done:
xor eax, eax
.exit:
mov [esp+v86_regs.size+10h+1Ch], eax
mov [esp+v86_regs.size+10h+18h], ebx
mov edx, [esp+v86_regs.size+10h+14h]
cmp edx, -1
jz @f
dec [v86_irqhooks+edx*8+4]
jnz @f
and [v86_irqhooks+edx*8], 0
@@:
mov esi, esp
mov edi, [esi+v86_regs.size+10h+10h]
add edi, v86_regs.size
mov ecx, v86_regs.size/4
rep movsd
mov esp, esi
cli
mov ecx, [CURRENT_TASK]
shl ecx, 8
pop eax
mov [SLOT_BASE+ecx+APPDATA.saved_esp0], eax
mov [tss._esp0], eax
pop eax
mov [SLOT_BASE+ecx+APPDATA.dir_table], eax
pop ebx
mov dword [SLOT_BASE+ecx+APPDATA.io_map+4], ebx
mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx
pop ebx
mov dword [SLOT_BASE+ecx+APPDATA.io_map], ebx
mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx
mov cr3, eax
; mov [irq_tab+5*4], 0
sti
popad
ret
;my05:
; mov dx, 30C2h
; mov cx, 4
;.0:
; in al, dx
; cmp al, 0FFh
; jz @f
; test al, 4
; jnz .1
;@@:
; add dx, 8
; in al, dx
; cmp al, 0FFh
; jz @f
; test al, 4
; jnz .1
;@@:
; loop .0
; ret
;.1:
; or al, 84h
; out dx, al
;.2:
; mov dx, 30F7h
; in al, dx
; mov byte [BOOT_VAR + 48Eh], 0FFh
; ret
v86_irq:
; push eax/pushad/jmp v86_irq
; eax = irq
mov ebx, eax
lea esi, [esp+18h]
lea edi, [esi+4]
mov ecx, 7
std
rep movsd
cld
mov edi, ebx
v86_irq2:
; pushad/call v86_irq2
; edi = irq
pop eax
mov esi, [v86_irqhooks+edi*8] ; get VM handle
mov eax, [esi+V86_machine.pagedir]
call get_pg_addr
mov ecx, [CURRENT_TASK]
shl ecx, 8
cmp [SLOT_BASE+ecx+APPDATA.dir_table], eax
jnz .notcurrent
lea eax, [edi+8]
cmp al, 10h
jb @f
add al, 70h-8
@@:
jmp v86_exc_c.simulate_int
.notcurrent:
mov ebx, SLOT_BASE + 0x100
mov ecx, [TASK_COUNT]
.scan:
cmp [ebx+APPDATA.dir_table], eax
jnz .cont
push ecx
mov ecx, [ebx+APPDATA.saved_esp0]
cmp word [ecx-v86_regs.size+v86_regs.esp], 6
jb .cont2
movzx edx, word [ecx-v86_regs.size+v86_regs.ss]
shl edx, 4
push eax
movzx eax, word [ecx-v86_regs.size+v86_regs.esp]
sub eax, 6
add edx, eax
mov eax, edx
call v86_get_lin_addr
cmp eax, 0x1000
jb .cont3
lea eax, [edx+5]
call v86_get_lin_addr
cmp eax, 0x1000
jb .cont3
pop eax
pop ecx
jmp .found
.cont3:
pop eax
.cont2:
pop ecx
.cont:
loop .scan
mov al, 20h
out 20h, al
cmp edi, 8
jb @f
out 0A0h, al
@@:
popad
iretd
.found:
mov cr3, eax
sub word [esi-v86_regs.size+v86_regs.esp], 6
mov ecx, [esi-v86_regs.size+v86_regs.eip]
mov word [edx], cx
mov ecx, [esi-v86_regs.size+v86_regs.cs]
mov word [edx+2], cx
mov ecx, [esi-v86_regs.size+v86_regs.eflags]
mov word [edx+4], cx
lea eax, [edi+8]
cmp al, 10h
jb @f
add al, 70h-8
@@:
mov cx, [eax*4]
mov word [esi-v86_regs.size+v86_regs.eip], cx
mov cx, [eax*4+2]
mov word [esi-v86_regs.size+v86_regs.cs], cx
and byte [esi-v86_regs.size+v86_regs.eflags+1], not 3
push ebx
call update_counters
pop ebx
sub ebx, SLOT_BASE
shr ebx, 8
mov esi, [CURRENT_TASK]
call do_change_task
popad
iretd
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