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Last change
on this file since 372 was 369, checked in by gregli@…, 13 years ago |
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Removed align directives for initalization code and added define for align in boot-time calls to the assembly library (defaulting to 1), resulting in a significant savings for the AT and 386 builds. Fixed a bug with switch command line handling in the serial server. Put in CR characters in licesnse.txt, so that it properly displays on Windows. In the configurator, added default values for user supplied CHS and LBA values, defaulting to values within range when those features are enabled. Updated the copyright message in the configurator as the literal word Copyright is important.
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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 | AH41h_HandlerForCheckIfExtensionsPresent:
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| 24 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh
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| 25 | jne SHORT .EbiosNotSupported
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| 26 |
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| 27 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION
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| 28 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h
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| 29 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT
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| 30 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared
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| 31 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
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| 32 | .EbiosNotSupported:
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| 33 | jmp Int13h_UnsupportedFunction
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