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Last change
on this file since 291 was 258, checked in by gregli@…, 13 years ago |
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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.
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File size:
1.1 KB
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| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=1h, Read Disk Status.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Int 13h function AH=1h, Read Disk Status.
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| 9 | ;
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| 10 | ; AH1h_HandlerForReadDiskStatus
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| 11 | ; Parameters:
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| 12 | ; DL: Translated Drive number
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| 13 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 14 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK
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| 15 | ; Returns with INTPACK:
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| 16 | ; AH: Int 13h floppy return status
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| 17 | ; CF: 0 if AH = RET_HD_SUCCESS, 1 otherwise (error)
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| 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| 20 | AH1h_HandlerForReadDiskStatus:
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| 21 | LOAD_BDA_SEGMENT_TO ds, ax, !
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| 22 |
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| 23 | %ifdef MODULE_SERIAL_FLOPPY
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| 24 | test dl, dl
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| 25 | jns .HardDisk
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| 26 | mov ah, [BDA.bFDRetST] ; Unlike for hard disks below, floppy version does not clear the status
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| 27 | jmp .done
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| 28 | .HardDisk:
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| 29 | %endif
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| 30 |
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| 31 | xchg ah, [BDA.bHDLastSt] ; Load and clear last error
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| 32 | ; Note that AH is cleared with the LOAD_BDA_SEGMENT above
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| 33 |
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| 34 | .done:
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| 35 | call Int13h_SetErrorCodeToIntpackInSSBPfromAH
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| 36 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
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