948 lines
22 KiB
PHP
948 lines
22 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;
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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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$Revision$
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; Low-level driver for HDD access
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; DMA support by Mario79
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; Access through BIOS by diamond
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align 4
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hd_read:
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;-----------------------------------------------------------
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; input : eax = block to read
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; ebx = destination
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;-----------------------------------------------------------
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and [hd_error], 0
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push ecx esi edi ; scan cache
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; mov ecx,cache_max ; entries in cache
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; mov esi,HD_CACHE+8
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call calculate_cache
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add esi, 8
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mov edi, 1
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hdreadcache:
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cmp dword [esi+4], 0; empty
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je nohdcache
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cmp [esi], eax ; correct sector
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je yeshdcache
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nohdcache:
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add esi, 8
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inc edi
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dec ecx
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jnz hdreadcache
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call find_empty_slot ; ret in edi
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cmp [hd_error], 0
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jne return_01
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; Read through BIOS?
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cmp [hdpos], 0x80
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jae .bios
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; hd_read_{dma,pio} use old ATA with 28 bit for sector number
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cmp eax, 0x10000000
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jb @f
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inc [hd_error]
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jmp return_01
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@@:
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; DMA read is permitted if [allow_dma_access]=1 or 2
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cmp [allow_dma_access], 2
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ja .nodma
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cmp [dma_hdd], 1
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jnz .nodma
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call hd_read_dma
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jmp @f
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.nodma:
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call hd_read_pio
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jmp @f
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.bios:
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call bd_read
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@@:
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cmp [hd_error], 0
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jne return_01
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; lea esi,[edi*8+HD_CACHE]
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; push eax
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call calculate_cache_1
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lea esi, [edi*8+esi]
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; pop eax
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mov [esi], eax ; sector number
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mov dword [esi+4], 1; hd read - mark as same as in hd
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yeshdcache:
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mov esi, edi
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shl esi, 9
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; add esi,HD_CACHE+65536
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push eax
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call calculate_cache_2
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add esi, eax
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pop eax
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mov edi, ebx
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mov ecx, 512/4
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cld
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rep movsd ; move data
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return_01:
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pop edi esi ecx
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ret
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align 4
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hd_read_pio:
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push eax edx
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call wait_for_hd_idle
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cmp [hd_error], 0
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jne hd_read_error
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cli
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xor eax, eax
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mov edx, [hdbase]
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inc edx
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out dx, al; ATAFeatures ॣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> "<EFBFBD>ᮡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⥩"
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inc edx
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inc eax
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out dx, al; ATASectorCount <EFBFBD><EFBFBD><EFBFBD><EFBFBD>稪 ᥪ<EFBFBD><EFBFBD>
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inc edx
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mov eax, [esp+4]
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out dx, al; ATASectorNumber ॣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ᥪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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shr eax, 8
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inc edx
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out dx, al; ATACylinder <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 樫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<EFBFBD><EFBFBD><EFBFBD><EFBFBD>訩 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
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shr eax, 8
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inc edx
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out dx, al; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 樫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<EFBFBD><EFBFBD><EFBFBD><EFBFBD>訩 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
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shr eax, 8
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inc edx
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and al, 1+2+4+8
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add al, byte [hdid]
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add al, 128+64+32
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out dx, al; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>/<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᪠
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inc edx
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mov al, 20h
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out dx, al; ATACommand ॣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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sti
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call wait_for_sector_buffer
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cmp [hd_error], 0
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jne hd_read_error
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cli
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push edi
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shl edi, 9
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; add edi,HD_CACHE+65536
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push eax
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call calculate_cache_2
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add edi, eax
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pop eax
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mov ecx, 256
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mov edx, [hdbase]
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cld
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rep insw
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pop edi
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sti
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pop edx eax
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ret
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disable_ide_int:
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; mov edx,[hdbase]
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; add edx,0x206
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; mov al,2
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; out dx,al
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cli
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ret
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enable_ide_int:
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; mov edx,[hdbase]
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; add edx,0x206
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; mov al,0
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; out dx,al
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sti
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ret
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align 4
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hd_write:
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;-----------------------------------------------------------
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; input : eax = block
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; ebx = pointer to memory
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;-----------------------------------------------------------
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push ecx esi edi
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; check if the cache already has the sector and overwrite it
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; mov ecx,cache_max
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; mov esi,HD_CACHE+8
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call calculate_cache
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add esi, 8
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mov edi, 1
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hdwritecache:
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cmp dword [esi+4], 0; if cache slot is empty
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je not_in_cache_write
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cmp [esi], eax ; if the slot has the sector
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je yes_in_cache_write
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not_in_cache_write:
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add esi, 8
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inc edi
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dec ecx
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jnz hdwritecache
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; sector not found in cache
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; write the block to a new location
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call find_empty_slot ; ret in edi
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cmp [hd_error], 0
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jne hd_write_access_denied
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; lea esi,[edi*8+HD_CACHE]
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; push eax
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call calculate_cache_1
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lea esi, [edi*8+esi]
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; pop eax
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mov [esi], eax ; sector number
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yes_in_cache_write:
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mov dword [esi+4], 2; write - differs from hd
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shl edi, 9
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; add edi,HD_CACHE+65536
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push eax
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call calculate_cache_2
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add edi, eax
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pop eax
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mov esi, ebx
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mov ecx, 512/4
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cld
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rep movsd ; move data
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hd_write_access_denied:
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pop edi esi ecx
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ret
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align 4
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cache_write_pio:
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cmp dword[esi], 0x10000000
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jae .bad
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; call disable_ide_int
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call wait_for_hd_idle
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cmp [hd_error], 0
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jne hd_write_error
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cli
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xor eax, eax
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mov edx, [hdbase]
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inc edx
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out dx, al
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inc edx
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inc eax
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out dx, al
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inc edx
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mov eax, [esi] ; eax = sector to write
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out dx, al
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shr eax, 8
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inc edx
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out dx, al
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shr eax, 8
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inc edx
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out dx, al
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shr eax, 8
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inc edx
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and al, 1+2+4+8
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add al, byte [hdid]
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add al, 128+64+32
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out dx, al
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inc edx
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mov al, 30h
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out dx, al
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sti
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call wait_for_sector_buffer
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cmp [hd_error], 0
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jne hd_write_error
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push ecx esi
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cli
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mov esi, edi
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shl esi, 9
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; add esi,HD_CACHE+65536 ; esi = from memory position
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push eax
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call calculate_cache_2
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add esi, eax
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pop eax
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mov ecx, 256
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mov edx, [hdbase]
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cld
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rep outsw
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sti
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; call enable_ide_int
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pop esi ecx
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ret
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.bad:
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inc [hd_error]
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ret
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save_hd_wait_timeout:
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push eax
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mov eax, [timer_ticks]
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add eax, 300 ; 3 sec timeout
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mov [hd_wait_timeout], eax
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pop eax
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ret
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align 4
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check_hd_wait_timeout:
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push eax
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mov eax, [hd_wait_timeout]
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cmp [timer_ticks], eax
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jg hd_timeout_error
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pop eax
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mov [hd_error], 0
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ret
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;iglobal
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; hd_timeout_str db 'K : FS - HD timeout',0
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; hd_read_str db 'K : FS - HD read error',0
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; hd_write_str db 'K : FS - HD write error',0
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; hd_lba_str db 'K : FS - HD LBA error',0
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;endg
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hd_timeout_error:
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; call clear_hd_cache
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; call clear_application_table_status
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; mov esi,hd_timeout_str
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; call sys_msg_board_str
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DEBUGF 1,"K : FS - HD timeout\n"
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mov [hd_error], 1
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pop eax
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ret
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hd_read_error:
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; call clear_hd_cache
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; call clear_application_table_status
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; mov esi,hd_read_str
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; call sys_msg_board_str
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DEBUGF 1,"K : FS - HD read error\n"
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pop edx eax
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ret
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hd_write_error:
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; call clear_hd_cache
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; call clear_application_table_status
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; mov esi,hd_write_str
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; call sys_msg_board_str
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DEBUGF 1,"K : FS - HD write error\n"
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ret
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hd_write_error_dma:
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; call clear_hd_cache
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; call clear_application_table_status
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; mov esi, hd_write_str
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; call sys_msg_board_str
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DEBUGF 1,"K : FS - HD read error\n"
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pop esi
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ret
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hd_lba_error:
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; call clear_hd_cache
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; call clear_application_table_status
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; mov esi,hd_lba_str
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; call sys_msg_board_str
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DEBUGF 1,"K : FS - HD LBA error\n"
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jmp LBA_read_ret
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align 4
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wait_for_hd_idle:
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push eax edx
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call save_hd_wait_timeout
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mov edx, [hdbase]
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add edx, 0x7
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wfhil1:
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call check_hd_wait_timeout
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cmp [hd_error], 0
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jne @f
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in al, dx
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test al, 128
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jnz wfhil1
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@@:
|
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pop edx eax
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ret
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align 4
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wait_for_sector_buffer:
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push eax edx
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mov edx, [hdbase]
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add edx, 0x7
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call save_hd_wait_timeout
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hdwait_sbuf: ; wait for sector buffer to be ready
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call check_hd_wait_timeout
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cmp [hd_error], 0
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jne @f
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in al, dx
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test al, 8
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jz hdwait_sbuf
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mov [hd_error], 0
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cmp [hd_setup], 1 ; do not mark error for setup request
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je buf_wait_ok
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test al, 1 ; previous command ended up with an error
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jz buf_wait_ok
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@@:
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mov [hd_error], 1
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buf_wait_ok:
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pop edx eax
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ret
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; \begin{Mario79}
|
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align 4
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wait_for_sector_dma_ide0:
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push eax
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push edx
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call save_hd_wait_timeout
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.wait:
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call change_task
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cmp [irq14_func], hdd_irq14
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jnz .done
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call check_hd_wait_timeout
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cmp [hd_error], 0
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jz .wait
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mov [irq14_func], hdd_irq_null
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mov dx, [IDEContrRegsBaseAddr]
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mov al, 0
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out dx, al
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.done:
|
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pop edx
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pop eax
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ret
|
||
|
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align 4
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wait_for_sector_dma_ide1:
|
||
push eax
|
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push edx
|
||
call save_hd_wait_timeout
|
||
.wait:
|
||
call change_task
|
||
cmp [irq15_func], hdd_irq15
|
||
jnz .done
|
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call check_hd_wait_timeout
|
||
cmp [hd_error], 0
|
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jz .wait
|
||
mov [irq15_func], hdd_irq_null
|
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mov dx, [IDEContrRegsBaseAddr]
|
||
add dx, 8
|
||
mov al, 0
|
||
out dx, al
|
||
.done:
|
||
pop edx
|
||
pop eax
|
||
ret
|
||
|
||
iglobal
|
||
align 4
|
||
; note that IDE descriptor table must be 4-byte aligned and do not cross 4K boundary
|
||
IDE_descriptor_table:
|
||
dd IDE_DMA
|
||
dw 0x2000
|
||
dw 0x8000
|
||
|
||
dma_cur_sector dd not 40h
|
||
dma_hdpos dd 0
|
||
irq14_func dd hdd_irq_null
|
||
irq15_func dd hdd_irq_null
|
||
endg
|
||
|
||
uglobal
|
||
; all uglobals are zeroed at boot
|
||
dma_process dd 0
|
||
dma_slot_ptr dd 0
|
||
cache_chain_pos dd 0
|
||
cache_chain_ptr dd 0
|
||
cache_chain_size db 0
|
||
cache_chain_started db 0
|
||
dma_task_switched db 0
|
||
dma_hdd db 0
|
||
allow_dma_access db 0
|
||
endg
|
||
|
||
align 4
|
||
hdd_irq14:
|
||
pushfd
|
||
cli
|
||
pushad
|
||
mov [irq14_func], hdd_irq_null
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
mov al, 0
|
||
out dx, al
|
||
; call update_counters
|
||
; mov ebx, [dma_process]
|
||
; cmp [CURRENT_TASK], ebx
|
||
; jz .noswitch
|
||
; mov [dma_task_switched], 1
|
||
; mov edi, [dma_slot_ptr]
|
||
; mov eax, [CURRENT_TASK]
|
||
; mov [dma_process], eax
|
||
; mov eax, [TASK_BASE]
|
||
; mov [dma_slot_ptr], eax
|
||
; mov [CURRENT_TASK], ebx
|
||
; mov [TASK_BASE], edi
|
||
; mov byte [DONT_SWITCH], 1
|
||
; call do_change_task
|
||
.noswitch:
|
||
popad
|
||
popfd
|
||
align 4
|
||
hdd_irq_null:
|
||
ret
|
||
|
||
align 4
|
||
hdd_irq15:
|
||
pushfd
|
||
cli
|
||
pushad
|
||
mov [irq15_func], hdd_irq_null
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
add dx, 8
|
||
mov al, 0
|
||
out dx, al
|
||
; call update_counters
|
||
; mov ebx, [dma_process]
|
||
; cmp [CURRENT_TASK], ebx
|
||
; jz .noswitch
|
||
; mov [dma_task_switched], 1
|
||
; mov edi, [dma_slot_ptr]
|
||
; mov eax, [CURRENT_TASK]
|
||
; mov [dma_process], eax
|
||
; mov eax, [TASK_BASE]
|
||
; mov [dma_slot_ptr], eax
|
||
; mov [CURRENT_TASK], ebx
|
||
; mov [TASK_BASE], edi
|
||
; mov byte [DONT_SWITCH], 1
|
||
; call do_change_task
|
||
.noswitch:
|
||
popad
|
||
popfd
|
||
ret
|
||
|
||
align 4
|
||
hd_read_dma:
|
||
push eax
|
||
push edx
|
||
mov edx, [dma_hdpos]
|
||
cmp edx, [hdpos]
|
||
jne .notread
|
||
mov edx, [dma_cur_sector]
|
||
cmp eax, edx
|
||
jb .notread
|
||
add edx, 15
|
||
cmp [esp+4], edx
|
||
ja .notread
|
||
mov eax, [esp+4]
|
||
sub eax, [dma_cur_sector]
|
||
shl eax, 9
|
||
add eax, (OS_BASE+IDE_DMA)
|
||
push ecx esi edi
|
||
mov esi, eax
|
||
shl edi, 9
|
||
; add edi, HD_CACHE+0x10000
|
||
push eax
|
||
call calculate_cache_2
|
||
add edi, eax
|
||
pop eax
|
||
|
||
mov ecx, 512/4
|
||
cld
|
||
rep movsd
|
||
pop edi esi ecx
|
||
pop edx
|
||
pop eax
|
||
ret
|
||
.notread:
|
||
mov eax, IDE_descriptor_table
|
||
mov dword [eax], IDE_DMA
|
||
mov word [eax+4], 0x2000
|
||
sub eax, OS_BASE
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
cmp [hdbase], 0x1F0
|
||
jz @f
|
||
add edx, 8
|
||
@@:
|
||
push edx
|
||
add edx, 4
|
||
out dx, eax
|
||
pop edx
|
||
mov al, 0
|
||
out dx, al
|
||
add edx, 2
|
||
mov al, 6
|
||
out dx, al
|
||
call wait_for_hd_idle
|
||
cmp [hd_error], 0
|
||
jnz hd_read_error
|
||
call disable_ide_int
|
||
xor eax, eax
|
||
mov edx, [hdbase]
|
||
inc edx
|
||
out dx, al
|
||
inc edx
|
||
mov eax, 10h
|
||
out dx, al
|
||
inc edx
|
||
mov eax, [esp+4]
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
and al, 0xF
|
||
add al, byte [hdid]
|
||
add al, 11100000b
|
||
out dx, al
|
||
inc edx
|
||
mov al, 0xC8
|
||
out dx, al
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
cmp [hdbase], 0x1F0
|
||
jz @f
|
||
add dx, 8
|
||
@@:
|
||
mov al, 9
|
||
out dx, al
|
||
mov eax, [CURRENT_TASK]
|
||
mov [dma_process], eax
|
||
mov eax, [TASK_BASE]
|
||
mov [dma_slot_ptr], eax
|
||
cmp [hdbase], 0x1F0
|
||
jnz .ide1
|
||
mov [irq14_func], hdd_irq14
|
||
jmp @f
|
||
.ide1:
|
||
mov [irq15_func], hdd_irq15
|
||
@@:
|
||
call enable_ide_int
|
||
cmp [hdbase], 0x1F0
|
||
jnz .wait_ide1
|
||
call wait_for_sector_dma_ide0
|
||
jmp @f
|
||
.wait_ide1:
|
||
call wait_for_sector_dma_ide1
|
||
@@:
|
||
cmp [hd_error], 0
|
||
jnz hd_read_error
|
||
mov eax, [hdpos]
|
||
mov [dma_hdpos], eax
|
||
pop edx
|
||
pop eax
|
||
mov [dma_cur_sector], eax
|
||
jmp hd_read_dma
|
||
|
||
align 4
|
||
write_cache_sector:
|
||
mov [cache_chain_size], 1
|
||
mov [cache_chain_pos], edi
|
||
write_cache_chain:
|
||
cmp [hdpos], 0x80
|
||
jae bd_write_cache_chain
|
||
mov eax, [cache_chain_ptr]
|
||
cmp dword[eax], 0x10000000
|
||
jae .bad
|
||
push esi
|
||
mov eax, IDE_descriptor_table
|
||
mov edx, eax
|
||
pusha
|
||
mov esi, [cache_chain_pos]
|
||
shl esi, 9
|
||
call calculate_cache_2
|
||
add esi, eax
|
||
mov edi, (OS_BASE+IDE_DMA)
|
||
mov dword [edx], IDE_DMA
|
||
movzx ecx, [cache_chain_size]
|
||
shl ecx, 9
|
||
mov word [edx+4], cx
|
||
shr ecx, 2
|
||
cld
|
||
rep movsd
|
||
popa
|
||
sub eax, OS_BASE
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
cmp [hdbase], 0x1F0
|
||
jz @f
|
||
add edx, 8
|
||
@@:
|
||
push edx
|
||
add edx, 4
|
||
out dx, eax
|
||
pop edx
|
||
mov al, 0
|
||
out dx, al
|
||
add edx, 2
|
||
mov al, 6
|
||
out dx, al
|
||
call wait_for_hd_idle
|
||
cmp [hd_error], 0
|
||
jnz hd_write_error_dma
|
||
call disable_ide_int
|
||
xor eax, eax
|
||
mov edx, [hdbase]
|
||
inc edx
|
||
out dx, al
|
||
inc edx
|
||
mov al, [cache_chain_size]
|
||
out dx, al
|
||
inc edx
|
||
mov esi, [cache_chain_ptr]
|
||
mov eax, [esi]
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
out dx, al
|
||
shr eax, 8
|
||
inc edx
|
||
and al, 0xF
|
||
add al, byte [hdid]
|
||
add al, 11100000b
|
||
out dx, al
|
||
inc edx
|
||
mov al, 0xCA
|
||
out dx, al
|
||
mov dx, [IDEContrRegsBaseAddr]
|
||
cmp [hdbase], 0x1F0
|
||
jz @f
|
||
add dx, 8
|
||
@@:
|
||
mov al, 1
|
||
out dx, al
|
||
mov eax, [CURRENT_TASK]
|
||
mov [dma_process], eax
|
||
mov eax, [TASK_BASE]
|
||
mov [dma_slot_ptr], eax
|
||
cmp [hdbase], 0x1F0
|
||
jnz .ide1
|
||
mov [irq14_func], hdd_irq14
|
||
jmp @f
|
||
.ide1:
|
||
mov [irq15_func], hdd_irq15
|
||
@@:
|
||
call enable_ide_int
|
||
mov [dma_cur_sector], not 0x40
|
||
cmp [hdbase], 0x1F0
|
||
jnz .wait_ide1
|
||
call wait_for_sector_dma_ide0
|
||
jmp @f
|
||
.wait_ide1:
|
||
call wait_for_sector_dma_ide1
|
||
@@:
|
||
cmp [hd_error], 0
|
||
jnz hd_write_error_dma
|
||
pop esi
|
||
ret
|
||
.bad:
|
||
inc [hd_error]
|
||
ret
|
||
|
||
uglobal
|
||
IDEContrRegsBaseAddr dw ?
|
||
endg
|
||
; \end{Mario79}
|
||
|
||
; \begin{diamond}
|
||
uglobal
|
||
bios_hdpos dd 0 ; 0 is invalid value for [hdpos]
|
||
bios_cur_sector dd ?
|
||
bios_read_len dd ?
|
||
endg
|
||
bd_read:
|
||
push eax
|
||
push edx
|
||
mov edx, [bios_hdpos]
|
||
cmp edx, [hdpos]
|
||
jne .notread
|
||
mov edx, [bios_cur_sector]
|
||
cmp eax, edx
|
||
jb .notread
|
||
add edx, [bios_read_len]
|
||
dec edx
|
||
cmp eax, edx
|
||
ja .notread
|
||
sub eax, [bios_cur_sector]
|
||
shl eax, 9
|
||
add eax, (OS_BASE+0x9A000)
|
||
push ecx esi edi
|
||
mov esi, eax
|
||
shl edi, 9
|
||
; add edi, HD_CACHE+0x10000
|
||
push eax
|
||
call calculate_cache_2
|
||
add edi, eax
|
||
pop eax
|
||
|
||
mov ecx, 512/4
|
||
cld
|
||
rep movsd
|
||
pop edi esi ecx
|
||
pop edx
|
||
pop eax
|
||
ret
|
||
.notread:
|
||
push ecx
|
||
mov dl, 42h
|
||
mov ecx, 16
|
||
call int13_call
|
||
pop ecx
|
||
test eax, eax
|
||
jnz .v86err
|
||
test edx, edx
|
||
jz .readerr
|
||
mov [bios_read_len], edx
|
||
mov edx, [hdpos]
|
||
mov [bios_hdpos], edx
|
||
pop edx
|
||
pop eax
|
||
mov [bios_cur_sector], eax
|
||
jmp bd_read
|
||
.readerr:
|
||
.v86err:
|
||
mov [hd_error], 1
|
||
jmp hd_read_error
|
||
|
||
bd_write_cache_chain:
|
||
pusha
|
||
mov esi, [cache_chain_pos]
|
||
shl esi, 9
|
||
call calculate_cache_2
|
||
add esi, eax
|
||
mov edi, OS_BASE + 0x9A000
|
||
movzx ecx, [cache_chain_size]
|
||
push ecx
|
||
shl ecx, 9-2
|
||
rep movsd
|
||
pop ecx
|
||
mov dl, 43h
|
||
mov eax, [cache_chain_ptr]
|
||
mov eax, [eax]
|
||
call int13_call
|
||
test eax, eax
|
||
jnz .v86err
|
||
cmp edx, ecx
|
||
jnz .writeerr
|
||
popa
|
||
ret
|
||
.v86err:
|
||
.writeerr:
|
||
popa
|
||
mov [hd_error], 1
|
||
jmp hd_write_error
|
||
|
||
uglobal
|
||
int13_regs_in rb sizeof.v86_regs
|
||
int13_regs_out rb sizeof.v86_regs
|
||
endg
|
||
|
||
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 [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
|
||
mov ecx, sizeof.v86_regs/4
|
||
xor eax, eax
|
||
rep stosd
|
||
mov byte [ebx+v86_regs.eax+1], dl
|
||
mov eax, [hdpos]
|
||
lea eax, [BiosDisksData+(eax-80h)*4]
|
||
mov dl, [eax]
|
||
mov byte [ebx+v86_regs.edx], dl
|
||
movzx edx, byte [eax+1]
|
||
; mov dl, 5
|
||
test edx, edx
|
||
jnz .hasirq
|
||
dec edx
|
||
jmp @f
|
||
.hasirq:
|
||
pushad
|
||
stdcall enable_irq, edx
|
||
popad
|
||
@@:
|
||
mov word [ebx+v86_regs.esi], 510h
|
||
mov word [ebx+v86_regs.ss], 9000h
|
||
mov word [ebx+v86_regs.esp], 0A000h
|
||
mov word [ebx+v86_regs.eip], 500h
|
||
mov [ebx+v86_regs.eflags], 20200h
|
||
mov esi, [sys_v86_machine]
|
||
mov ecx, 0x502
|
||
push fs
|
||
call v86_start
|
||
pop fs
|
||
and [bios_hdpos], 0
|
||
pop edi esi ecx ebx
|
||
movzx edx, byte [OS_BASE + 512h]
|
||
test byte [int13_regs_out+v86_regs.eflags], 1
|
||
jnz @f
|
||
mov edx, ecx
|
||
@@:
|
||
ret
|
||
; \end{diamond}
|