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Line 45... Line 45...
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; First is main page directory for V86 mode.
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; First is main page directory for V86 mode.
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; Second page:
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; Second page:
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; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
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; first half (0x800 bytes) is page table for addresses 0 - 0x100000,
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; second half is for V86-to-linear translation.
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; second half is for V86-to-linear translation.
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; Third and fourth are for I/O permission map.
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; Third and fourth are for I/O permission map.
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        push    8000h                  ;page block less 8Kb are discontinuous
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        push    8000h           ; blocks less than 8 pages are discontinuous
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        call    kernel_alloc
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        call    kernel_alloc
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        test    eax, eax
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        test    eax, eax
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        jz      .fail2
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        jz      .fail2
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        mov     [ebx+V86_machine.pagedir], eax
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        mov     [ebx+V86_machine.pagedir], eax
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        push    edi eax
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        push    edi eax
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; Allocate memory in V86 machine
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; Allocate memory in V86 machine
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; in: eax=size (in bytes)
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; in: eax=size (in bytes)
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;     esi=handle
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;     esi=handle
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; out: eax=V86 address, para-aligned (0x10 multiple)
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; out: eax=V86 address, para-aligned (0x10 multiple)
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; destroys: nothing
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; destroys: nothing
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; ᠭ!!!
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; ­¥¤®¯¨á ­ !!!
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;v86_alloc:
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;v86_alloc:
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;        push    ebx ecx edx edi
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;        push    ebx ecx edx edi
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;        lea     ebx, [esi+V86_machine.mutex]
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;        lea     ebx, [esi+V86_machine.mutex]
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;        call    wait_mutex
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;        call    wait_mutex
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;        add     eax, 0x1F
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;        add     eax, 0x1F
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; If faulted EIP exceeds 0xFFFF, we have #GP and it is an error
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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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        cmp     word [esp+v86_regs.eip+2], 0
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        jnz     .nogp
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        jnz     .nogp
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; Otherwise we can safely access byte at CS:IP
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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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; (because it is #GP, not #PF handler)
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; ᫨    嫮 ᪫祭 ⮫쪮 - ⥭ ⮢ ,
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; …᫨ ¡ë ¬ë ¬®£«¨ áå«®¯®â âì ¨áª«î祭¨¥ ⮫쪮 ¨§-§  ç⥭¨ï ¡ ©â®¢ ª®¤ ,
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;    㦥 嫮⠫   뫮   #GP
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; ¬ë ¡ë ¥£® 㦥 áå«®¯®â «¨ ¨ íâ® ¡ë«® ¡ë ­¥ #GP
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        movzx   esi, word [esp+v86_regs.cs]
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        movzx   esi, word [esp+v86_regs.cs]
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        shl     esi, 4
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        shl     esi, 4
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        add     esi, [esp+v86_regs.eip]
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        add     esi, [esp+v86_regs.eip]
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        lodsb
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        lodsb
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        cmp     al, 0xCD        ; int xx command = CD xx
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        cmp     al, 0xCD        ; int xx command = CD xx
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        cmp     [SLOT_BASE+ecx+APPDATA.dir_table], eax
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        cmp     [SLOT_BASE+ecx+APPDATA.dir_table], eax
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        jnz     .notcurrent
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        jnz     .notcurrent
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        lea     eax, [edi+8]
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        lea     eax, [edi+8]
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        cmp     al, 10h
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        cmp     al, 10h
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        jb      @f
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        jb      @f
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        add     al, 70h-8
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        add     al, 60h
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@@:
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@@:
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        jmp     v86_exc_c.simulate_int
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        jmp     v86_exc_c.simulate_int
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.notcurrent:
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.notcurrent:
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        mov     ebx, SLOT_BASE + 0x100
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        mov     ebx, SLOT_BASE + 0x100
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        mov     ecx, [TASK_COUNT]
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        mov     ecx, [TASK_COUNT]
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        mov     ecx, [esi-v86_regs.size+v86_regs.eflags]
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        mov     ecx, [esi-v86_regs.size+v86_regs.eflags]
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        mov     word [edx+4], cx
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        mov     word [edx+4], cx
854 
        lea     eax, [edi+8]
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        lea     eax, [edi+8]
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        cmp     al, 10h
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        cmp     al, 10h
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        jb      @f
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        jb      @f
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        add     al, 70h-8
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        add     al, 60h
858 
@@:
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@@:
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        mov     cx, [eax*4]
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        mov     cx, [eax*4]
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        mov     word [esi-v86_regs.size+v86_regs.eip], cx
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        mov     word [esi-v86_regs.size+v86_regs.eip], cx
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        mov     cx, [eax*4+2]
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        mov     cx, [eax*4+2]
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        mov     word [esi-v86_regs.size+v86_regs.cs], cx
 862 
        mov     word [esi-v86_regs.size+v86_regs.cs], cx