mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-15 03:12:35 +03:00
288 lines
9.0 KiB
PHP
288 lines
9.0 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2015. 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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; Disk access through BIOS
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iglobal
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align 4
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bd_callbacks:
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dd bd_callbacks.end - bd_callbacks ; strucsize
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dd 0 ; no close function
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dd 0 ; no closemedia function
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dd bd_querymedia
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dd bd_read_interface
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dd bd_write_interface
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dd 0 ; no flush function
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dd 0 ; use default cache size
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.end:
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endg
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uglobal
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bios_hdpos dd 0
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bios_cur_sector dd ?
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bios_read_len dd ?
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cache_chain_ptr dd ?
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int13_regs_in rb sizeof.v86_regs
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int13_regs_out rb sizeof.v86_regs
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cache_chain_size db ?
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endg
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;-----------------------------------------------------------------
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proc bd_read_interface stdcall uses edi, \
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userdata, buffer, startsector:qword, numsectors
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; userdata = old [hdpos] = 80h + index in NumBiosDisks
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; buffer = pointer to buffer for data
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; startsector = 64-bit start sector
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; numsectors = pointer to number of sectors on input,
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; must be filled with number of sectors really read
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locals
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sectors_todo dd ?
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endl
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; 1. Initialize number of sectors: get number of requested sectors
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; and say that no sectors were read yet.
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mov ecx, [numsectors]
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mov eax, [ecx]
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mov dword [ecx], 0
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mov [sectors_todo], eax
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; 2. Acquire the global lock.
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mov ecx, ide_mutex
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call mutex_lock
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; 3. Convert parameters to the form suitable for worker procedures.
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; Underlying procedures do not know about 64-bit sectors.
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; Worker procedures use global variables and edi for [buffer].
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cmp dword [startsector+4], 0
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jnz .fail
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and [hd_error], 0
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mov eax, [userdata]
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mov [hdpos], eax
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mov eax, dword [startsector]
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mov edi, [buffer]
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; 4. Worker procedures take one sectors per time, so loop over all sectors to read.
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.sectors_loop:
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call bd_read
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cmp [hd_error], 0
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jnz .fail
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mov ecx, [numsectors]
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inc dword [ecx] ; one more sector is read
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dec [sectors_todo]
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jz .done
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inc eax
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jnz .sectors_loop
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; 5. Loop is done, either due to error or because everything is done.
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; Release the global lock and return the corresponding status.
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.fail:
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mov ecx, ide_mutex
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call mutex_unlock
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or eax, -1
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ret
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.done:
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mov ecx, ide_mutex
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call mutex_unlock
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xor eax, eax
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ret
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endp
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;-----------------------------------------------------------------
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proc bd_write_interface stdcall uses esi edi, \
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userdata, buffer, startsector:qword, numsectors
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; userdata = old [hdpos] = 80h + index in NumBiosDisks
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; buffer = pointer to buffer with data
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; startsector = 64-bit start sector
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; numsectors = pointer to number of sectors on input,
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; must be filled with number of sectors really written
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locals
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sectors_todo dd ?
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endl
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; 1. Initialize number of sectors: get number of requested sectors
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; and say that no sectors were read yet.
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mov ecx, [numsectors]
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mov eax, [ecx]
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mov dword [ecx], 0
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mov [sectors_todo], eax
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; 2. Acquire the global lock.
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mov ecx, ide_mutex
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call mutex_lock
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; 3. Convert parameters to the form suitable for worker procedures.
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; Underlying procedures do not know about 64-bit sectors.
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; Worker procedures use global variables and esi for [buffer].
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cmp dword [startsector+4], 0
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jnz .fail
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and [hd_error], 0
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mov eax, [userdata]
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mov [hdpos], eax
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mov esi, [buffer]
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lea edi, [startsector]
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mov [cache_chain_ptr], edi
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; 4. Worker procedures take max 16 sectors per time,
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; loop until all sectors will be processed.
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.sectors_loop:
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mov ecx, 16
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cmp ecx, [sectors_todo]
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jbe @f
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mov ecx, [sectors_todo]
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@@:
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mov [cache_chain_size], cl
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call bd_write_cache_chain
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cmp [hd_error], 0
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jnz .fail
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movzx ecx, [cache_chain_size]
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mov eax, [numsectors]
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add [eax], ecx
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sub [sectors_todo], ecx
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jz .done
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add [edi], ecx
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jc .fail
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shl ecx, 9
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add esi, ecx
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jmp .sectors_loop
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; 5. Loop is done, either due to error or because everything is done.
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; Release the global lock and return the corresponding status.
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.fail:
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mov ecx, ide_mutex
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call mutex_unlock
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or eax, -1
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ret
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.done:
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mov ecx, ide_mutex
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call mutex_unlock
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xor eax, eax
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ret
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endp
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;-----------------------------------------------------------------
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; This is a stub.
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proc bd_querymedia stdcall, hd_data, mediainfo
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mov eax, [mediainfo]
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mov [eax+DISKMEDIAINFO.Flags], 0
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mov [eax+DISKMEDIAINFO.SectorSize], 512
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or dword [eax+DISKMEDIAINFO.Capacity], 0xFFFFFFFF
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or dword [eax+DISKMEDIAINFO.Capacity+4], 0xFFFFFFFF
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xor eax, eax
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ret
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endp
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;-----------------------------------------------------------------
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bd_read:
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push eax
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push edx
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mov edx, [bios_hdpos]
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cmp edx, [hdpos]
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jne .notread
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mov edx, [bios_cur_sector]
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cmp eax, edx
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jb .notread
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add edx, [bios_read_len]
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dec edx
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cmp eax, edx
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ja .notread
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sub eax, [bios_cur_sector]
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shl eax, 9
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add eax, (OS_BASE+0x99000)
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push ecx esi
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mov esi, eax
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mov ecx, 512/4
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cld
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rep movsd
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pop esi ecx
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pop edx
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pop eax
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ret
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.notread:
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push ecx
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mov dl, 42h
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mov ecx, 16
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call int13_call
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pop ecx
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test eax, eax
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jnz .v86err
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test edx, edx
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jz .readerr
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mov [bios_read_len], edx
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mov edx, [hdpos]
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mov [bios_hdpos], edx
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pop edx
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pop eax
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mov [bios_cur_sector], eax
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jmp bd_read
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.readerr:
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.v86err:
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pop edx
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pop eax
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mov [hd_error], 1
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jmp hd_read_error
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;-----------------------------------------------------------------
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bd_write_cache_chain:
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pusha
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mov edi, OS_BASE + 0x99000
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movzx ecx, [cache_chain_size]
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push ecx
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shl ecx, 9-2
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rep movsd
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pop ecx
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mov dl, 43h
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mov eax, [cache_chain_ptr]
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mov eax, [eax]
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call int13_call
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test eax, eax
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jnz .v86err
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cmp edx, ecx
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jnz .writeerr
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popa
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ret
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.v86err:
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.writeerr:
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popa
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mov [hd_error], 1
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jmp hd_write_error
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;-----------------------------------------------------------------
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int13_call:
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; Because this code uses fixed addresses,
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; it can not be run simultaniously by many threads.
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; In current implementation it is protected by common mutex 'ide_status'
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mov word [OS_BASE + 510h], 10h ; packet length
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mov word [OS_BASE + 512h], cx ; number of sectors
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mov dword [OS_BASE + 514h], 99000000h ; buffer 9900:0000
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mov dword [OS_BASE + 518h], eax
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and dword [OS_BASE + 51Ch], 0
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push ebx ecx esi edi
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mov ebx, int13_regs_in
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mov edi, ebx
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mov ecx, sizeof.v86_regs/4
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xor eax, eax
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rep stosd
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mov byte [ebx+v86_regs.eax+1], dl
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mov eax, [hdpos]
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lea eax, [BiosDisksData+(eax-80h)*4]
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mov dl, [eax]
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mov byte [ebx+v86_regs.edx], dl
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movzx edx, byte [eax+1]
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; mov dl, 5
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test edx, edx
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jnz .hasirq
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dec edx
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jmp @f
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.hasirq:
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pushad
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stdcall enable_irq, edx
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popad
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@@:
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mov word [ebx+v86_regs.esi], 510h
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mov word [ebx+v86_regs.ss], 9000h
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mov word [ebx+v86_regs.esp], 09000h
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mov word [ebx+v86_regs.eip], 500h
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mov [ebx+v86_regs.eflags], 20200h
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mov esi, [sys_v86_machine]
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mov ecx, 0x502
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push fs
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call v86_start
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pop fs
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and [bios_hdpos], 0
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pop edi esi ecx ebx
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movzx edx, byte [OS_BASE + 512h]
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test byte [int13_regs_out+v86_regs.eflags], 1
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jnz @f
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mov edx, ecx
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@@:
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ret
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