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Last change
on this file since 29 was 28, checked in by Tomi Tilli, 14 years ago |
- v1.1.1 broke booting from foreign drives, it is now fixed.
- Improved error handling a bit.
- Longer DRQ and IRQ timeouts to minimize write timouts with some (bad) CF cards.
- Default boot menu drive should now be properly selected.
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File size:
1.0 KB
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| 1 | ; File name : AH1h_HStatus.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 27.9.2007
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| 4 | ; Last update : 29.7.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Int 13h function AH=1h, Read Disk Status.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Int 13h function AH=1h, Read Disk Status.
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| 13 | ;
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| 14 | ; AH1h_HandlerForReadDiskStatus
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| 15 | ; Parameters:
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| 16 | ; AH: Bios function 1h
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| 17 | ; DL: Drive number (8xh)
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| 18 | ; Parameters loaded by Int13h_Jump:
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| 19 | ; DS: RAMVARS segment
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| 20 | ; Returns:
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| 21 | ; AH: Int 13h floppy return status
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| 22 | ; CF: 0 if AH = RET_HD_SUCCESS, 1 otherwise (error)
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| 23 | ; IF: 1
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| 24 | ; Corrupts registers:
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| 25 | ; Flags
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| 26 | ;--------------------------------------------------------------------
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| 27 | ALIGN JUMP_ALIGN
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| 28 | AH1h_HandlerForReadDiskStatus:
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| 29 | push ds
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| 30 |
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| 31 | LOAD_BDA_SEGMENT_TO ds, di
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| 32 | xor ah, ah ; Zero AH
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| 33 | cmp ah, [BDA.bHDLastSt] ; Set CF if error code is non-zero
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| 34 | xchg ah, [BDA.bHDLastSt] ; Last error to AH, zero to BDA
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| 35 |
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| 36 | pop ds
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| 37 | jmp Int13h_PopDiDsAndReturn
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