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Rev 1083 Rev 1448
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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: 1083 $
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$Revision: 1448 $
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; Virtual-8086 mode manager
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; Virtual-8086 mode manager
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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
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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 = 0
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; linear address = BOOT_VAR = OS_BASE + 0x2f0000
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; linear address = OS_BASE
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        mov     dword [eax], (BOOT_VAR - OS_BASE) or 111b
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        mov     dword [eax], 111b
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        mov     dword [eax+800h], BOOT_VAR
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        mov     dword [eax+800h], OS_BASE
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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 = 0x9C000
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; physical address = 0x9C000
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; linear address = 0x8009C000
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; linear address = 0x8009C000
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; (I have seen one computer with EBDA segment = 0x9D80,
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; (I have seen one computer with EBDA segment = 0x9D80,
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init_sys_v86:
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init_sys_v86:
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        call    v86_create
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        call    v86_create
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        mov     [sys_v86_machine], eax
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        mov     [sys_v86_machine], eax
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        test    eax, eax
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        test    eax, eax
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        jz      .ret
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        jz      .ret
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        mov     byte [BOOT_VAR + 0x500], 0xCD
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        mov     byte [OS_BASE + 0x500], 0xCD
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        mov     byte [BOOT_VAR + 0x501], 0x13
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        mov     byte [OS_BASE + 0x501], 0x13
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        mov     byte [BOOT_VAR + 0x502], 0xF4
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        mov     byte [OS_BASE + 0x502], 0xF4
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        mov     byte [BOOT_VAR + 0x503], 0xCD
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        mov     byte [OS_BASE + 0x503], 0xCD
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        mov     byte [BOOT_VAR + 0x504], 0x10
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        mov     byte [OS_BASE + 0x504], 0x10
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        mov     byte [BOOT_VAR + 0x505], 0xF4
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        mov     byte [OS_BASE + 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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; 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+0x1000], 0x99000 or 111b
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        mov     dword [ebx+0x99*4+0x1800], OS_BASE + 0x99000
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        mov     dword [ebx+0x99*4+0x1800], OS_BASE + 0x99000