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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 4420 $
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$Revision: 4420 $
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; Access through BIOS by diamond
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; Disk access through BIOS
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iglobal
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iglobal
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align 4
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align 4
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bd_callbacks:
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bd_callbacks:
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        dd      0       ; no flush function
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        dd      0       ; no flush function
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        dd      0       ; use default cache size
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        dd      0       ; use default cache size
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.end:
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.end:
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endg
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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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proc bd_read_interface stdcall uses edi, \
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        userdata, buffer, startsector:qword, numsectors
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        userdata, buffer, startsector:qword, numsectors
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        ; userdata = old [hdpos] = 80h + index in NumBiosDisks
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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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        ; buffer = pointer to buffer for data
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        mov     ecx, ide_mutex
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        mov     ecx, ide_mutex
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        call    mutex_unlock
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        call    mutex_unlock
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        xor     eax, eax
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        xor     eax, eax
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        ret
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        ret
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endp
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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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proc bd_write_interface stdcall uses esi edi, \
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        userdata, buffer, startsector:qword, numsectors
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        userdata, buffer, startsector:qword, numsectors
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        ; userdata = old [hdpos] = 80h + index in NumBiosDisks
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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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        ; buffer = pointer to buffer with data
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        ; startsector = 64-bit start sector
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        ; startsector = 64-bit start sector
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        mov     ecx, ide_mutex
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        mov     ecx, ide_mutex
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        call    mutex_unlock
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        call    mutex_unlock
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        xor     eax, eax
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        xor     eax, eax
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        ret
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        ret
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endp
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endp
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;-----------------------------------------------------------------
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; This is a stub.
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; This is a stub.
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proc bd_querymedia stdcall, hd_data, mediainfo
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proc bd_querymedia stdcall, hd_data, mediainfo
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        mov     eax, [mediainfo]
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        mov     eax, [mediainfo]
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        mov     [eax+DISKMEDIAINFO.Flags], 0
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        mov     [eax+DISKMEDIAINFO.Flags], 0
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        mov     [eax+DISKMEDIAINFO.SectorSize], 512
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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], 0xFFFFFFFF
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        or      dword [eax+DISKMEDIAINFO.Capacity+4], 0xFFFFFFFF
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        or      dword [eax+DISKMEDIAINFO.Capacity+4], 0xFFFFFFFF
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        xor     eax, eax
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        xor     eax, eax
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        ret
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        ret
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endp
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endp
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;-----------------------------------------------------------------------------
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;-----------------------------------------------------------------
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; \begin{diamond}
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uglobal
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bios_hdpos      dd 0       ; 0 is invalid value for [hdpos]
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bios_cur_sector dd ?
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bios_read_len   dd ?
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endg
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;-----------------------------------------------------------------------------
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align 4
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bd_read:
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bd_read:
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        push    eax
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        push    eax
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        push    edx
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        push    edx
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        mov     edx, [bios_hdpos]
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        mov     edx, [bios_hdpos]
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        cmp     edx, [hdpos]
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        cmp     edx, [hdpos]
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        jmp     bd_read
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        jmp     bd_read
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.readerr:
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.readerr:
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.v86err:
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.v86err:
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        mov     [hd_error], 1
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        mov     [hd_error], 1
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        jmp     hd_read_error
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        jmp     hd_read_error
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;-----------------------------------------------------------------------------
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;-----------------------------------------------------------------
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align 4
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bd_write_cache_chain:
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bd_write_cache_chain:
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        pusha
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        pusha
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        mov     edi, OS_BASE + 0x9A000
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        mov     edi, OS_BASE + 0x9A000
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        movzx   ecx, [cache_chain_size]
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        movzx   ecx, [cache_chain_size]
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        push    ecx
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        push    ecx
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.v86err:
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.v86err:
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.writeerr:
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.writeerr:
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        popa
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        popa
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        mov     [hd_error], 1
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        mov     [hd_error], 1
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        jmp     hd_write_error
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        jmp     hd_write_error
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;-----------------------------------------------------------------------------
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;-----------------------------------------------------------------
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uglobal
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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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endg
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;-----------------------------------------------------------------------------
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align 4
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int13_call:
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int13_call:
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; Because this code uses fixed addresses,
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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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; 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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; 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 + 510h], 10h             ; packet length
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        test    byte [int13_regs_out+v86_regs.eflags], 1
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        test    byte [int13_regs_out+v86_regs.eflags], 1
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        jnz     @f
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        jnz     @f
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        mov     edx, ecx
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        mov     edx, ecx
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@@:
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@@:
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        ret
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        ret
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; \end{diamond}
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