source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1h_HStatus.asm @ 277

Last change on this file since 277 was 258, checked in by gregli@…, 12 years ago

Added floppy drive emulation over the serial connection (MODULE_SERIAL_FLOPPY). Along the way, various optimizations were made to stay within the 8K ROM size target. Also, serial code now returns the number of sectors transferred.
File size: 1.1 KB
RevLine 
[116]1; Project name  :   XTIDE Universal BIOS
[3]2; Description   :   Int 13h function AH=1h, Read Disk Status.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=1h, Read Disk Status.
9;
10; AH1h_HandlerForReadDiskStatus
11;   Parameters:
[148]12;       DL:     Translated Drive number
13;       DS:DI:  Ptr to DPT (in RAMVARS segment)
[150]14;       SS:BP:  Ptr to IDEREGS_AND_INTPACK
15;   Returns with INTPACK:
[3]16;       AH:     Int 13h floppy return status
17;       CF:     0 if AH = RET_HD_SUCCESS, 1 otherwise (error)
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20AH1h_HandlerForReadDiskStatus:
[148]21    LOAD_BDA_SEGMENT_TO ds, ax, !
[258]22
23%ifdef MODULE_SERIAL_FLOPPY
24    test    dl, dl
25    jns     .HardDisk
26    mov     ah, [BDA.bFDRetST]      ; Unlike for hard disks below, floppy version does not clear the status
27    jmp     .done
28.HardDisk: 
29%endif
30       
[148]31    xchg    ah, [BDA.bHDLastSt]     ; Load and clear last error
[258]32                                    ; Note that AH is cleared with the LOAD_BDA_SEGMENT above
33               
34.done:
[150]35    call    Int13h_SetErrorCodeToIntpackInSSBPfromAH
[148]36    jmp     Int13h_ReturnFromHandlerWithoutStoringErrorCode
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