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Last change
on this file since 340 was 294, checked in by krille_n_@…, 13 years ago |
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Commit 2/2 (BIOS):
- Fixed a bug in AH1h_HStatus.asm.
- Minor optimizations.
- Fixed spelling and did some cleaning.
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File size:
1.2 KB
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| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=41h, Check if Extensions Present.
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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=41h, Check if Extensions Present.
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| 9 | ;
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| 10 | ; AH41h_HandlerForCheckIfExtensionsPresent
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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 IDEPACK
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| 15 | ; Parameters on INTPACK:
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| 16 | ; BX: 55AAh
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| 17 | ; Returns with INTPACK:
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| 18 | ; AH: Major version of EBIOS extensions
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| 19 | ; BX: AA55h
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| 20 | ; CX: Support bits
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| 21 | ; CF: 0 if successful, 1 if error
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | AH41h_HandlerForCheckIfExtensionsPresent:
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| 25 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh
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| 26 | jne SHORT .EbiosNotSupported
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| 27 |
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| 28 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION
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| 29 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h
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| 30 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT
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| 31 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared
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| 32 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
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| 33 | .EbiosNotSupported:
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| 34 | jmp Int13h_UnsupportedFunction
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