;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 4420 $
; Disk access through BIOS
iglobal
align 4
bd_callbacks:
dd bd_callbacks.end - bd_callbacks ; strucsize
dd 0 ; no close function
dd 0 ; no closemedia function
dd bd_querymedia
dd bd_read_interface
dd bd_write_interface
dd 0 ; no flush function
dd 0 ; use default cache size
.end:
endg
uglobal
bios_hdpos dd 0
bios_cur_sector dd ?
bios_read_len dd ?
cache_chain_ptr dd ?
int13_regs_in rb sizeof.v86_regs
int13_regs_out rb sizeof.v86_regs
cache_chain_size db ?
endg
;-----------------------------------------------------------------
proc bd_read_interface stdcall uses edi, \
userdata, buffer, startsector:qword, numsectors
; userdata = old [hdpos] = 80h + index in NumBiosDisks
; buffer = pointer to buffer for data
; startsector = 64-bit start sector
; numsectors = pointer to number of sectors on input,
; must be filled with number of sectors really read
locals
sectors_todo dd ?
endl
; 1. Initialize number of sectors: get number of requested sectors
; and say that no sectors were read yet.
mov ecx, [numsectors]
mov eax, [ecx]
mov dword [ecx], 0
mov [sectors_todo], eax
; 2. Acquire the global lock.
mov ecx, ide_mutex
call mutex_lock
; 3. Convert parameters to the form suitable for worker procedures.
; Underlying procedures do not know about 64-bit sectors.
; Worker procedures use global variables and edi for [buffer].
cmp dword [startsector+4], 0
jnz .fail
and [hd_error], 0
mov eax, [userdata]
mov [hdpos], eax
mov eax, dword [startsector]
mov edi, [buffer]
; 4. Worker procedures take one sectors per time, so loop over all sectors to read.
.sectors_loop:
call bd_read
cmp [hd_error], 0
jnz .fail
mov ecx, [numsectors]
inc dword [ecx] ; one more sector is read
dec [sectors_todo]
jz .done
inc eax
jnz .sectors_loop
; 5. Loop is done, either due to error or because everything is done.
; Release the global lock and return the corresponding status.
.fail:
mov ecx, ide_mutex
call mutex_unlock
or eax, -1
ret
.done:
mov ecx, ide_mutex
call mutex_unlock
xor eax, eax
ret
endp
;-----------------------------------------------------------------
proc bd_write_interface stdcall uses esi edi, \
userdata, buffer, startsector:qword, numsectors
; userdata = old [hdpos] = 80h + index in NumBiosDisks
; buffer = pointer to buffer with data
; startsector = 64-bit start sector
; numsectors = pointer to number of sectors on input,
; must be filled with number of sectors really written
locals
sectors_todo dd ?
endl
; 1. Initialize number of sectors: get number of requested sectors
; and say that no sectors were read yet.
mov ecx, [numsectors]
mov eax, [ecx]
mov dword [ecx], 0
mov [sectors_todo], eax
; 2. Acquire the global lock.
mov ecx, ide_mutex
call mutex_lock
; 3. Convert parameters to the form suitable for worker procedures.
; Underlying procedures do not know about 64-bit sectors.
; Worker procedures use global variables and esi for [buffer].
cmp dword [startsector+4], 0
jnz .fail
and [hd_error], 0
mov eax, [userdata]
mov [hdpos], eax
mov esi, [buffer]
lea edi, [startsector]
mov [cache_chain_ptr], edi
; 4. Worker procedures take max 16 sectors per time,
; loop until all sectors will be processed.
.sectors_loop:
mov ecx, 16
cmp ecx, [sectors_todo]
jbe @f
mov ecx, [sectors_todo]
@@:
mov [cache_chain_size], cl
call bd_write_cache_chain
cmp [hd_error], 0
jnz .fail
movzx ecx, [cache_chain_size]
mov eax, [numsectors]
add [eax], ecx
sub [sectors_todo], ecx
jz .done
add [edi], ecx
jc .fail
shl ecx, 9
add esi, ecx
jmp .sectors_loop
; 5. Loop is done, either due to error or because everything is done.
; Release the global lock and return the corresponding status.
.fail:
mov ecx, ide_mutex
call mutex_unlock
or eax, -1
ret
.done:
mov ecx, ide_mutex
call mutex_unlock
xor eax, eax
ret
endp
;-----------------------------------------------------------------
; This is a stub.
proc bd_querymedia stdcall, hd_data, mediainfo
mov eax, [mediainfo]
mov [eax+DISKMEDIAINFO.Flags], 0
mov [eax+DISKMEDIAINFO.SectorSize], 512
or dword [eax+DISKMEDIAINFO.Capacity], 0xFFFFFFFF
or dword [eax+DISKMEDIAINFO.Capacity+4], 0xFFFFFFFF
xor eax, eax
ret
endp
;-----------------------------------------------------------------
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
mov esi, eax
mov ecx, 512/4
cld
rep movsd
pop 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 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
;-----------------------------------------------------------------
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 'ide_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