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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    4000h
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        push    8000h                  ;page block less 8Kb 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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        add     edi, (OS_BASE shr 20) - 4
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        add     edi, (OS_BASE shr 20) - 4
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        push    esi
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        push    esi
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        mov     esi, (OS_BASE shr 20) + sys_pgdir
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        mov     esi, (OS_BASE shr 20) + sys_pgdir
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        mov     ecx, 0x80000000 shr 22
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        mov     ecx, 0x80000000 shr 22
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        rep     movsd
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        rep     movsd
- 
 
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- 
 
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        mov     eax, [ebx+V86_machine.pagedir]   ;root dir also is
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        call    get_pg_addr                      ;used as page table
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        or      al, PG_SW
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        mov [edi-4096+(page_tabs shr 20)], eax
- 
 
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        pop     esi
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        pop     esi
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; now V86 specific: initialize known addresses in first Mb
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; now V86 specific: initialize known addresses in first Mb
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        pop     eax edi
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        pop     eax edi
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; first page - BIOS data (shared between all machines!)
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; first page - BIOS data (shared between all machines!)
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; physical address = 0x2f0000
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; physical address = 0x2f0000
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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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; ­¥¤®¯¨á ­ !!!
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; ᠭ!!!
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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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; …᫨ ¡ë ¬ë ¬®£«¨ áå«®¯®â âì ¨áª«î祭¨¥ ⮫쪮 ¨§-§  ç⥭¨ï ¡ ©â®¢ ª®¤ ,
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; ᫨    嫮 ᪫祭 ⮫쪮 - ⥭ ⮢ ,
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; ¬ë ¡ë ¥£® 㦥 áå«®¯®â «¨ ¨ íâ® ¡ë«® ¡ë ­¥ #GP
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;    㦥 嫮⠫   뫮   #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