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