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identical mapping of first physical page in V86 

(some BIOSes use physical address of ds:si for int 13h)

git-svn-id: svn://kolibrios.org@1448 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Evgeny Grechnikov (Diamond) 2010-04-14 18:41:33 +00:00
parent 7ca326635d
commit 66d949f4b4
2 changed files with 16 additions and 16 deletions
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12
kernel/trunk/blkdev/hd_drv.inc
View File

@ -882,11 +882,11 @@ int13_call:
; Because this code uses fixed addresses,
; it can not be run simultaniously by many threads.
; In current implementation it is protected by common mutex 'hd1_status'
mov word [BOOT_VAR + 510h], 10h ; packet length
mov word [BOOT_VAR + 512h], cx ; number of sectors
mov dword [BOOT_VAR + 514h], 9A000000h ; buffer 9A00:0000
mov dword [BOOT_VAR + 518h], eax
and dword [BOOT_VAR + 51Ch], 0
mov word [OS_BASE + 510h], 10h ; packet length
mov word [OS_BASE + 512h], cx ; number of sectors
mov dword [OS_BASE + 514h], 9A000000h ; buffer 9A00:0000
mov dword [OS_BASE + 518h], eax
and dword [OS_BASE + 51Ch], 0
push ebx ecx esi edi
mov ebx, int13_regs_in
mov edi, ebx
@ -919,7 +919,7 @@ int13_call:
call v86_start
and [bios_hdpos], 0
pop edi esi ecx ebx
movzx edx, byte [BOOT_VAR + 512h]
movzx edx, byte [OS_BASE + 512h]
test byte [int13_regs_out+v86_regs.eflags], 1
jnz @f
mov edx, ecx

20
kernel/trunk/core/v86.inc
View File

@ -91,10 +91,10 @@ v86_create:
; now V86 specific: initialize known addresses in first Mb
pop eax
; first page - BIOS data (shared between all machines!)
; physical address = 0x2f0000
; linear address = BOOT_VAR = OS_BASE + 0x2f0000
mov dword [eax], (BOOT_VAR - OS_BASE) or 111b
mov dword [eax+800h], BOOT_VAR
; physical address = 0
; linear address = OS_BASE
mov dword [eax], 111b
mov dword [eax+800h], OS_BASE
; page before 0xA0000 - Extended BIOS Data Area (shared between all machines!)
; physical address = 0x9C000
; linear address = 0x8009C000
@ -219,12 +219,12 @@ init_sys_v86:
mov [sys_v86_machine], eax
test eax, eax
jz .ret
mov byte [BOOT_VAR + 0x500], 0xCD
mov byte [BOOT_VAR + 0x501], 0x13
mov byte [BOOT_VAR + 0x502], 0xF4
mov byte [BOOT_VAR + 0x503], 0xCD
mov byte [BOOT_VAR + 0x504], 0x10
mov byte [BOOT_VAR + 0x505], 0xF4
mov byte [OS_BASE + 0x500], 0xCD
mov byte [OS_BASE + 0x501], 0x13
mov byte [OS_BASE + 0x502], 0xF4
mov byte [OS_BASE + 0x503], 0xCD
mov byte [OS_BASE + 0x504], 0x10
mov byte [OS_BASE + 0x505], 0xF4
mov esi, eax
mov ebx, [eax+V86_machine.pagedir]
; one page for stack, two pages for results (0x2000 bytes = 16 sectors)