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Last change
on this file since 148 was
148,
checked in by aitotat, 13 years ago
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Changes to XTIDE Universal BIOS:
- INT 13h optimizations to save almost 100 bytes.
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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=15h, Read Disk Drive Size. |
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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=15h, Read Disk Drive Size. |
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| 9 | ; |
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| 10 | ; AH15h_HandlerForReadDiskDriveSize |
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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 INTPACK |
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| 15 | ; Returns with INTPACK in SS:BP: |
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| 16 | ; If succesfull: |
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| 17 | ; AH: 3 (Hard disk accessible) |
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| 18 | ; CX:DX: Total number of sectors |
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| 19 | ; CF: 0 |
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| 20 | ; If failed: |
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| 21 | ; AH: 0 (Drive not present) |
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| 22 | ; CX:DX: 0 |
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| 23 | ; CF: 1 |
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| 24 | ;-------------------------------------------------------------------- |
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| 25 | ALIGN JUMP_ALIGN |
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| 26 | AH15h_HandlerForReadDiskDriveSize: |
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| 27 | call HCapacity_GetSectorCountFromOurAH08h ; Sector count to DX:AX |
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| 28 | mov [bp+INTPACK.cx], dx ; HIWORD to CX |
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| 29 | mov [bp+INTPACK.dx], ax ; LOWORD to DX |
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| 30 | |
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| 31 | xor ah, ah |
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| 32 | call HError_SetErrorCodeToIntpackInSSBPfromAH ; Store success to BDA and CF |
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| 33 | mov BYTE [bp+INTPACK.ah], 3 ; Type code = Hard disk |
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| 34 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode |
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