| [116] | 1 | ; Project name : XTIDE Universal BIOS |
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| [3] | 2 | ; Description : Int 13h function AH=Ch, Seek. |
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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=Ch, Seek. |
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| 9 | ; |
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| 10 | ; AHCh_HandlerForSeek |
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| 11 | ; Parameters: |
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| [148] | 12 | ; CX, DH: Same as in INTPACK |
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| 13 | ; DL: Translated Drive number |
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| 14 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 15 | ; SS:BP: Ptr to INTPACK |
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| 16 | ; Parameters on INTPACK in SS:BP: |
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| [3] | 17 | ; CH: Cylinder number, bits 7...0 |
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| 18 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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| 19 | ; Bits 5...0: Starting sector number (1...63) |
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| 20 | ; DH: Starting head number (0...255) |
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| [148] | 21 | ; Returns with INTPACK in SS:BP: |
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| [3] | 22 | ; AH: BIOS Error code |
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| 23 | ; CF: 0 if succesfull, 1 if error |
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| 24 | ;-------------------------------------------------------------------- |
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| 25 | ALIGN JUMP_ALIGN |
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| 26 | AHCh_HandlerForSeek: |
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| [84] | 27 | %ifndef USE_186 |
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| [3] | 28 | call AHCh_SeekToCylinder |
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| [148] | 29 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| [84] | 30 | %else |
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| [148] | 31 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| [84] | 32 | ; Fall through to AHCh_SeekToCylinder |
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| 33 | %endif |
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| [3] | 34 | |
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| 35 | |
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| 36 | ;-------------------------------------------------------------------- |
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| 37 | ; AHCh_SeekToCylinder |
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| 38 | ; Parameters: |
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| 39 | ; CH: Cylinder number, bits 7...0 |
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| 40 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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| 41 | ; Bits 5...0: Starting sector number (1...63) |
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| 42 | ; DH: Starting head number (0...255) |
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| [148] | 43 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| [3] | 44 | ; Returns: |
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| 45 | ; AH: BIOS Error code |
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| 46 | ; CF: 0 if succesfull, 1 if error |
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| 47 | ; Corrupts registers: |
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| 48 | ; AL, BX, CX, DX |
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| 49 | ;-------------------------------------------------------------------- |
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| 50 | AHCh_SeekToCylinder: |
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| 51 | mov ax, HCMD_SEEK<<8 ; Load cmd to AH, AL=zero sector cnt |
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| 52 | call HCommand_OutputCountAndLCHSandCommand |
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| [148] | 53 | jc SHORT .ReturnWithErrorCodeInAH |
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| [3] | 54 | mov bx, di ; DS:BX now points to DPT |
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| 55 | jmp HStatus_WaitIrqOrRdy ; Wait for IRQ or RDY |
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| [148] | 56 | .ReturnWithErrorCodeInAH: |
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| [3] | 57 | ret |
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