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Rev 789 Rev 820
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;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2007-2008. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License    ;;
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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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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 789 $
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$Revision: 820 $
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; Virtual-8086 mode manager
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; Virtual-8086 mode manager
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        or      al, PG_SW
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        or      al, PG_SW
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        mov [edi-4096+(page_tabs shr 20)], eax
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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
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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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; linear address = BOOT_VAR = OS_BASE + 0x2f0000
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; linear address = BOOT_VAR = OS_BASE + 0x2f0000
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        mov     dword [eax], (BOOT_VAR - OS_BASE) or 111b
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        mov     dword [eax], (BOOT_VAR - OS_BASE) or 111b
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        mov     dword [eax+800h], BOOT_VAR
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        mov     dword [eax+800h], BOOT_VAR
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; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
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; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
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; physical address = 0x9F000
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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     ecx, 4
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        mov     edx, 0x9C000
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; linear address = 0x8009F000
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        push    eax
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        lea     edi, [eax+0x9C*4]
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        mov     dword [eax+0x9E*4], 0x9E000 or 111b
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@@:
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        mov     dword [eax+0x9E*4+800h], 0x9E000 + OS_BASE
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        lea     eax, [edx + OS_BASE]
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        mov     dword [eax+0x9F*4], 0x9F000 or 111b
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        mov     [edi+800h], eax
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        lea     eax, [edx + 111b]
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        stosd
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        loop    @b
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        pop     eax
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        mov     dword [eax+0x9F*4+800h], 0x9F000 + OS_BASE
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        pop     edi
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; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
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; addresses 0xC0000 - 0xFFFFF - BIOS code (shared between all machines!)
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; physical address = 0xC0000
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; physical address = 0xC0000
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; linear address = 0x800C0000
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; linear address = 0x800C0000
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        mov     ecx, 0xC0
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        mov     ecx, 0xC0
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        mov     byte [BOOT_VAR + 0x503], 0xCD
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        mov     byte [BOOT_VAR + 0x503], 0xCD
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        mov     byte [BOOT_VAR + 0x504], 0x10
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        mov     byte [BOOT_VAR + 0x504], 0x10
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        mov     byte [BOOT_VAR + 0x505], 0xF4
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        mov     byte [BOOT_VAR + 0x505], 0xF4
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        mov     esi, eax
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        mov     esi, eax
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        mov     ebx, [eax+V86_machine.pagedir]
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        mov     ebx, [eax+V86_machine.pagedir]
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; one page for stack, two pages for results (0x2000 bytes = 16 sectors)
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        mov     dword [ebx+0x99*4+0x1000], 0x99000 or 111b
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        mov     dword [ebx+0x99*4+0x1800], OS_BASE + 0x99000
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        mov     dword [ebx+0x9A*4+0x1000], 0x9A000 or 111b
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        mov     dword [ebx+0x9A*4+0x1800], OS_BASE + 0x9A000
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        mov     dword [ebx+0x9B*4+0x1000], 0x9B000 or 111b
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        mov     dword [ebx+0x9B*4+0x1000], 0x9B000 or 111b
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        mov     dword [ebx+0x9B*4+0x1800], OS_BASE + 0x9B000
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        mov     dword [ebx+0x9B*4+0x1800], OS_BASE + 0x9B000
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        mov     dword [ebx+0x9C*4+0x1000], 0x9C000 or 111b
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        mov     dword [ebx+0x9C*4+0x1800], OS_BASE + 0x9C000
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        mov     dword [ebx+0x9D*4+0x1000], 0x9D000 or 111b
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        mov     dword [ebx+0x9D*4+0x1800], OS_BASE + 0x9D000
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if ~DEBUG_SHOW_IO
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if ~DEBUG_SHOW_IO
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; allow access to all ports
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; allow access to all ports
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        mov     ecx, [esi+V86_machine.iopm]
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        mov     ecx, [esi+V86_machine.iopm]
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        xor     eax, eax
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        xor     eax, eax
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        mov     edi, ecx
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        mov     edi, ecx