910 lines
25 KiB
PHP
910 lines
25 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2007-2015. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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; Virtual-8086 mode manager
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; diamond, 2007, 2008
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DEBUG_SHOW_IO = 0
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struct V86_machine
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; page directory
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process dd ?
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; mutex to protect all data from writing by multiple threads at one time
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mutex dd ?
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; i/o permission map
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iopm dd ?
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ends
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; Create V86 machine
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; in: nothing
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; out: eax = handle (pointer to struc V86_machine)
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; eax = NULL => failure
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; destroys: ebx, ecx, edx (due to malloc)
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v86_create:
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; allocate V86_machine structure
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mov eax, sizeof.V86_machine
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call malloc
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test eax, eax
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jz .fail
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; initialize mutex
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and dword [eax+V86_machine.mutex], 0
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; allocate tables
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mov ebx, eax
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stdcall create_process, 4096
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test eax, eax
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jz .fail2
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mov [eax+PROC.mem_used], 4096
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mov [ebx+V86_machine.process], eax
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push 2000h
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call kernel_alloc
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test eax, eax
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jz .fail2
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mov [ebx+V86_machine.iopm], eax
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; initialize tables
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push edi
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mov edi, eax
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mov eax, -1
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mov ecx, 2000h/4
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rep stosd
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mov eax, [ebx+V86_machine.process]
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mov eax, [eax+PROC.pdt_0_phys]
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pushfd
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cli
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mov cr3, eax
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; now V86 specific: initialize known addresses in first Mb
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; first page - BIOS data (shared between all machines!)
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; physical address = 0
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; linear address = OS_BASE
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; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
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; physical address = 0x9C000
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; linear address = 0x8009C000
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; (I have seen one computer with EBDA segment = 0x9D80,
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; all other computers use less memory)
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mov eax, PG_UWR
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mov [page_tabs], eax
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invlpg [eax]
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mov byte [0x500], 0xCD
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mov byte [0x501], 0x13
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mov byte [0x502], 0xF4
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mov byte [0x503], 0xCD
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mov byte [0x504], 0x10
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mov byte [0x505], 0xF4
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mov eax, 0x98000+PG_UWR
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mov edi, page_tabs+0x98*4
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mov edx, 0x1000
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mov ecx, 8
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@@:
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stosd
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add eax, edx
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loop @b
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; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
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; physical address = 0xC0000
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mov eax, 0xC0000+PG_UWR
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mov edi, page_tabs+0xC0*4
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mov ecx, 64
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@@:
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stosd
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add eax, edx
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loop @b
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mov eax, sys_proc
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push ebx
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; call set_cr3
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pop ebx
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popfd
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pop edi
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mov eax, ebx
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ret
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.fail2:
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mov eax, ebx
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call free
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.fail:
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xor eax, eax
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ret
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;not used
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; Destroy V86 machine
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; in: eax = handle
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; out: nothing
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; destroys: eax, ebx, ecx, edx (due to free)
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;v86_destroy:
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; push eax
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; stdcall kernel_free, [eax+V86_machine.pagedir]
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; pop eax
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; jmp free
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; Translate V86-address to linear address
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; in: eax=V86 address
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; esi=handle
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; out: eax=linear address
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; destroys: nothing
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v86_get_lin_addr:
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push ecx edx
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mov ecx, eax
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shr ecx, 12
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mov edx, [page_tabs+ecx*4]
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and eax, 0xFFF
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and edx, 0xFFFFF000
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or eax, edx
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pop edx ecx
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ret
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;not used
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; Sets linear address for V86-page
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; in: eax=linear address (must be page-aligned)
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; ecx=V86 page (NOT address!)
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; esi=handle
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; out: nothing
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; destroys: nothing
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;v86_set_page:
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; push eax ebx
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; mov ebx, [esi+V86_machine.pagedir]
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; mov [ebx+ecx*4+0x1800], eax
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; call get_pg_addr
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; or al, 111b
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; mov [ebx+ecx*4+0x1000], eax
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; pop ebx eax
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; ret
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; Allocate memory in V86 machine
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; in: eax=size (in bytes)
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; esi=handle
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; out: eax=V86 address, para-aligned (0x10 multiple)
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; destroys: nothing
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; недописана!!!
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;v86_alloc:
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; push ebx ecx edx edi
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; lea ebx, [esi+V86_machine.mutex]
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; call wait_mutex
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; add eax, 0x1F
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; shr eax, 4
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; mov ebx, 0x1000 ; start with address 0x1000 (second page)
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; mov edi, [esi+V86_machine.tables]
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;.l:
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; mov ecx, ebx
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; shr ecx, 12
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; mov edx, [edi+0x1000+ecx*4] ; get linear address
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; test edx, edx ; page allocated?
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; jz .unalloc
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; mov ecx, ebx
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; and ecx, 0xFFF
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; add edx, ecx
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; cmp dword [edx], 0 ; free block?
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; jnz .n
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; cmp dword [edx+4],
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; and [esi+V86_machine.mutex], 0
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; pop edi edx ecx ebx
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; ret
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uglobal
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sys_v86_machine dd ?
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endg
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; Called from kernel.asm at first stages of loading
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; Initialize system V86 machine (used to simulate BIOS int 13h)
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init_sys_v86:
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call v86_create
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mov [sys_v86_machine], eax
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test eax, eax
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jz .ret
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mov esi, eax
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if ~DEBUG_SHOW_IO
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; allow access to all ports
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mov ecx, [esi+V86_machine.iopm]
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xor eax, eax
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mov edi, ecx
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mov ecx, 10000h/8/4
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rep stosd
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end if
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.ret:
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ret
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struct v86_regs
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; don't change the order, it is important
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edi dd ?
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esi dd ?
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ebp dd ?
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dd ? ; ignored
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ebx dd ?
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edx dd ?
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ecx dd ?
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eax dd ?
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eip dd ?
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cs dd ?
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eflags dd ? ; VM flag must be set!
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esp dd ?
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ss dd ?
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es dd ?
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ds dd ?
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fs dd ?
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gs dd ?
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ends
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; Run V86 machine
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; in: ebx -> registers for V86 (two structures: in and out)
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; esi = handle
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; ecx = expected end address (CS:IP)
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; edx = IRQ to hook or -1 if not required
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; out: structure pointed to by ebx is filled with new values
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; eax = 1 - exception has occured, cl contains code
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; eax = 2 - access to disabled i/o port, ecx contains port address
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; eax = 3 - IRQ is already hooked by another VM
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; destroys: nothing
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v86_start:
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pushad
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cli
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mov ecx, [current_slot]
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push dword [ecx+APPDATA.io_map]
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push dword [ecx+APPDATA.io_map+4]
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push [ecx+APPDATA.process]
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push [ecx+APPDATA.saved_esp0]
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mov [ecx+APPDATA.saved_esp0], esp
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mov [tss._esp0], esp
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mov eax, [esi+V86_machine.iopm]
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call get_pg_addr
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inc eax
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mov dword [ecx+APPDATA.io_map], eax
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mov dword [page_tabs + (tss._io_map_0 shr 10)], eax
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mov eax, [esi+V86_machine.iopm]
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add eax, 0x1000
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call get_pg_addr
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inc eax
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mov dword [ecx+APPDATA.io_map+4], eax
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mov dword [page_tabs + (tss._io_map_1 shr 10)], eax
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mov eax, [esi+V86_machine.process]
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mov [ecx+APPDATA.process], eax
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mov [current_process], eax
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mov eax, [eax+PROC.pdt_0_phys]
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mov cr3, eax
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; We do not enable interrupts, because V86 IRQ redirector assumes that
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; machine is running
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; They will be enabled by IRET.
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; sti
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mov eax, esi
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sub esp, sizeof.v86_regs
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mov esi, ebx
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mov edi, esp
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mov ecx, sizeof.v86_regs/4
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rep movsd
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cmp edx, -1
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jz .noirqhook
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uglobal
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v86_irqhooks rd IRQ_RESERVED * 2
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endg
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cmp [v86_irqhooks+edx*8], 0
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jz @f
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cmp [v86_irqhooks+edx*8], eax
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jz @f
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mov esi, v86_irqerr
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call sys_msg_board_str
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inc [v86_irqhooks+edx*8+4]
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mov eax, 3
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jmp v86_exc_c.exit
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@@:
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mov [v86_irqhooks+edx*8], eax
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inc [v86_irqhooks+edx*8+4]
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.noirqhook:
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popad
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iretd
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; It is only possible to leave virtual-8086 mode by faulting to
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; a protected-mode interrupt handler (typically the general-protection
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; exception handler, which in turn calls the virtual 8086-mode monitor).
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iglobal
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v86_exc_str1 db 'V86 : unexpected exception ',0
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v86_exc_str2 db ' at ',0
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v86_exc_str3 db ':',0
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v86_exc_str4 db 13,10,'V86 : faulted code:',0
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v86_exc_str5 db ' (unavailable)',0
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v86_newline db 13,10,0
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v86_io_str1 db 'V86 : access to disabled i/o port ',0
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v86_io_byte db ' (byte)',13,10,0
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v86_io_word db ' (word)',13,10,0
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v86_io_dword db ' (dword)',13,10,0
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v86_irqerr db 'V86 : IRQ already hooked',13,10,0
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endg
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v86_exc_c:
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; Did we all that we have wanted to do?
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cmp bl, 1
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jne @f
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xor eax, eax
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mov dr6, eax
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@@:
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mov eax, [esp+sizeof.v86_regs+10h+18h]
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cmp word [esp+v86_regs.eip], ax
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jnz @f
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shr eax, 16
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cmp word [esp+v86_regs.cs], ax
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jz .done
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@@:
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; Various system events, which must be handled, result in #GP
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cmp bl, 13
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jnz .nogp
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; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error
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cmp word [esp+v86_regs.eip+2], 0
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jnz .nogp
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; Otherwise we can safely access byte at CS:IP
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; (because it is #GP, not #PF handler)
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; Если бы мы могли схлопотать исключение только из-за чтения байтов кода,
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; мы бы его уже схлопотали и это было бы не #GP
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movzx esi, word [esp+v86_regs.cs]
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shl esi, 4
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add esi, [esp+v86_regs.eip]
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lodsb
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cmp al, 0xCD ; int xx command = CD xx
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jz .handle_int
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cmp al, 0xCF
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jz .handle_iret
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cmp al, 0xF3
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jz .handle_rep
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cmp al, 0xEC
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jz .handle_in
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cmp al, 0xED
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jz .handle_in_word
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cmp al, 0xEE
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jz .handle_out
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cmp al, 0xEF
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jz .handle_out_word
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cmp al, 0xE4
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jz .handle_in_imm
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cmp al, 0xE6
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jz .handle_out_imm
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cmp al, 0x9C
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jz .handle_pushf
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cmp al, 0x9D
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jz .handle_popf
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cmp al, 0xFA
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jz .handle_cli
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cmp al, 0xFB
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jz .handle_sti
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cmp al, 0x66
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jz .handle_66
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jmp .nogp
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.handle_int:
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cmp word [esp+v86_regs.eip], 0xFFFF
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jae .nogp
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xor eax, eax
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lodsb
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; call sys_msg_board_byte
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; simulate INT command
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; N.B. It is possible that some checks need to be corrected,
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; but at least in case of normal execution the code works.
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.simulate_int:
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cmp word [esp+v86_regs.esp], 6
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jae @f
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mov bl, 12 ; #SS exception
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jmp .nogp
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@@:
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movzx edx, word [esp+v86_regs.ss]
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shl edx, 4
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push eax
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movzx eax, word [esp+4+v86_regs.esp]
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sub eax, 6
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add edx, eax
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mov eax, edx
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mov esi, [esp+4+sizeof.v86_regs+10h+4]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14 ; #PF exception
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jmp .nogp
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@@:
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lea eax, [edx+5]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14 ; #PF exception
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jmp .nogp
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@@:
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sub word [esp+4+v86_regs.esp], 6
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mov eax, [esp+4+v86_regs.eip]
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cmp byte [esp+1], 0
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jnz @f
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inc eax
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inc eax
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@@:
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mov word [edx], ax
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mov eax, [esp+4+v86_regs.cs]
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mov word [edx+2], ax
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mov eax, [esp+4+v86_regs.eflags]
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mov word [edx+4], ax
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pop eax
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mov ah, 0
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mov cx, [eax*4]
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mov word [esp+v86_regs.eip], cx
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mov cx, [eax*4+2]
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mov word [esp+v86_regs.cs], cx
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; note that interrupts will be disabled globally at IRET
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and byte [esp+v86_regs.eflags+1], not 3 ; clear IF and TF flags
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; continue V86 execution
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popad
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iretd
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.handle_iret:
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cmp word [esp+v86_regs.esp], 0x10000 - 6
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jbe @f
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mov bl, 12
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jmp .nogp
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@@:
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movzx edx, word [esp+v86_regs.ss]
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shl edx, 4
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movzx eax, word [esp+v86_regs.esp]
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add edx, eax
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mov eax, edx
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mov esi, [esp+sizeof.v86_regs+10h+4]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14
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jmp .nogp
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@@:
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lea eax, [edx+5]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14
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jmp .nogp
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@@:
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mov ax, [edx]
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mov word [esp+v86_regs.eip], ax
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mov ax, [edx+2]
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mov word [esp+v86_regs.cs], ax
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mov ax, [edx+4]
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mov word [esp+v86_regs.eflags], ax
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add word [esp+v86_regs.esp], 6
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popad
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iretd
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.handle_pushf:
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cmp word [esp+v86_regs.esp], 1
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jnz @f
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mov bl, 12
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jmp .nogp
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@@:
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movzx edx, word [esp+v86_regs.ss]
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shl edx, 4
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mov eax, [esp+v86_regs.esp]
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sub eax, 2
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movzx eax, ax
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add edx, eax
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mov eax, edx
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mov esi, [esp+sizeof.v86_regs+10h+4]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14 ; #PF exception
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jmp .nogp
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@@:
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lea eax, [edx+1]
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call v86_get_lin_addr
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cmp eax, 0x1000
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jae @f
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mov bl, 14
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jmp .nogp
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@@:
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sub word [esp+v86_regs.esp], 2
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mov eax, [esp+v86_regs.eflags]
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mov [edx], ax
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inc word [esp+v86_regs.eip]
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popad
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iretd
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.handle_pushfd:
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cmp word [esp+v86_regs.esp], 4
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jae @f
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mov bl, 12 ; #SS exception
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jmp .nogp
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@@:
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movzx edx, word [esp+v86_regs.ss]
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shl edx, 4
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movzx eax, word [esp+v86_regs.esp]
|
||
sub eax, 4
|
||
add edx, eax
|
||
mov eax, edx
|
||
mov esi, [esp+sizeof.v86_regs+10h+4]
|
||
call v86_get_lin_addr
|
||
cmp eax, 0x1000
|
||
jae @f
|
||
mov bl, 14 ; #PF exception
|
||
jmp .nogp
|
||
@@:
|
||
lea eax, [edx+3]
|
||
call v86_get_lin_addr
|
||
cmp eax, 0x1000
|
||
jae @f
|
||
mov bl, 14 ; #PF exception
|
||
jmp .nogp
|
||
@@:
|
||
sub word [esp+v86_regs.esp], 4
|
||
movzx eax, word [esp+v86_regs.eflags]
|
||
mov [edx], eax
|
||
add word [esp+v86_regs.eip], 2
|
||
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+sizeof.v86_regs+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_popfd:
|
||
cmp word [esp+v86_regs.esp], 0x10000 - 4
|
||
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+sizeof.v86_regs+10h+4]
|
||
call v86_get_lin_addr
|
||
cmp eax, 0x1000
|
||
jae @f
|
||
mov bl, 14
|
||
jmp .nogp
|
||
@@:
|
||
lea eax, [edx+3]
|
||
call v86_get_lin_addr
|
||
cmp eax, 0x1000
|
||
jae @f
|
||
mov bl, 14
|
||
jmp .nogp
|
||
@@:
|
||
mov eax, [edx]
|
||
mov word [esp+v86_regs.eflags], ax
|
||
add word [esp+v86_regs.esp], 4
|
||
add word [esp+v86_regs.eip], 2
|
||
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, 0x9C
|
||
jz .handle_pushfd
|
||
cmp al, 0x9D
|
||
jz .handle_popfd
|
||
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+sizeof.v86_regs+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+sizeof.v86_regs+10h+1Ch], eax
|
||
mov [esp+sizeof.v86_regs+10h+18h], ebx
|
||
|
||
mov edx, [esp+sizeof.v86_regs+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+sizeof.v86_regs+10h+10h]
|
||
add edi, sizeof.v86_regs
|
||
mov ecx, sizeof.v86_regs/4
|
||
rep movsd
|
||
mov esp, esi
|
||
|
||
cli
|
||
mov ecx, [current_slot]
|
||
pop eax
|
||
|
||
mov [ecx+APPDATA.saved_esp0], eax
|
||
mov [tss._esp0], eax
|
||
pop eax
|
||
mov [ecx+APPDATA.process], eax
|
||
mov [current_process], eax
|
||
pop ebx
|
||
mov dword [ecx+APPDATA.io_map+4], ebx
|
||
mov dword [page_tabs + (tss._io_map_1 shr 10)], ebx
|
||
pop ebx
|
||
mov dword [ecx+APPDATA.io_map], ebx
|
||
mov dword [page_tabs + (tss._io_map_0 shr 10)], ebx
|
||
mov eax, [eax+PROC.pdt_0_phys]
|
||
mov cr3, eax
|
||
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
|
||
|
||
align 4
|
||
v86_irq:
|
||
; push irq/pushad/jmp v86_irq
|
||
; ebp = irq
|
||
lea esi, [esp+1Ch]
|
||
lea edi, [esi+4]
|
||
mov ecx, 8
|
||
std
|
||
rep movsd
|
||
cld
|
||
mov edi, ebp
|
||
pop eax
|
||
v86_irq2:
|
||
mov esi, [v86_irqhooks+edi*8] ; get VM handle
|
||
mov eax, [esi+V86_machine.process]
|
||
mov ecx, [CURRENT_TASK]
|
||
shl ecx, 8
|
||
cmp [SLOT_BASE+ecx+APPDATA.process], eax
|
||
jnz .notcurrent
|
||
lea eax, [edi+8]
|
||
cmp al, 10h
|
||
mov ah, 1
|
||
jb @f
|
||
add al, 60h
|
||
@@:
|
||
jmp v86_exc_c.simulate_int
|
||
.notcurrent:
|
||
mov ebx, SLOT_BASE + 0x100
|
||
mov ecx, [TASK_COUNT]
|
||
.scan:
|
||
cmp [ebx+APPDATA.process], eax
|
||
jnz .cont
|
||
push ecx
|
||
mov ecx, [ebx+APPDATA.saved_esp0]
|
||
cmp word [ecx-sizeof.v86_regs+v86_regs.esp], 6
|
||
jb .cont2
|
||
movzx edx, word [ecx-sizeof.v86_regs+v86_regs.ss]
|
||
shl edx, 4
|
||
push eax
|
||
movzx eax, word [ecx-sizeof.v86_regs+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:
|
||
add ebx, 0x100
|
||
loop .scan
|
||
mov ecx, edi
|
||
call irq_eoi
|
||
popad
|
||
iretd
|
||
.found:
|
||
mov eax, [eax+PROC.pdt_0_phys]
|
||
mov cr3, eax
|
||
mov esi, [ebx+APPDATA.saved_esp0]
|
||
sub word [esi-sizeof.v86_regs+v86_regs.esp], 6
|
||
mov ecx, [esi-sizeof.v86_regs+v86_regs.eip]
|
||
mov word [edx], cx
|
||
mov ecx, [esi-sizeof.v86_regs+v86_regs.cs]
|
||
mov word [edx+2], cx
|
||
mov ecx, [esi-sizeof.v86_regs+v86_regs.eflags]
|
||
mov word [edx+4], cx
|
||
lea eax, [edi+8]
|
||
cmp al, 10h
|
||
jb @f
|
||
add al, 60h
|
||
@@:
|
||
mov cx, [eax*4]
|
||
mov word [esi-sizeof.v86_regs+v86_regs.eip], cx
|
||
mov cx, [eax*4+2]
|
||
mov word [esi-sizeof.v86_regs+v86_regs.cs], cx
|
||
and byte [esi-sizeof.v86_regs+v86_regs.eflags+1], not 3
|
||
call update_counters
|
||
lea edi, [ebx + 0x100000000 - SLOT_BASE]
|
||
shr edi, 3
|
||
add edi, CURRENT_TASK
|
||
call find_next_task.found
|
||
call do_change_task
|
||
popad
|
||
iretd
|