Last change
on this file since 165 was
165,
checked in by aitotat@…, 13 years ago
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Changes to XTIDE Universal BIOS:
- Hopefully this commit is successful. Sorry for the mess.
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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=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: 55AAh |
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20 | ; CX: Support bits |
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21 | ; CF: 0 if succesfull, 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 WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT |
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29 | mov ah, EBIOS_VERSION |
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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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