| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Int 13h function AH=Ch, Seek. |
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| 3 | |
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| 4 | ; |
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| 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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| 12 | ; |
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| 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | ; GNU General Public License for more details. |
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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| 19 | |
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| 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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| 24 | ; Int 13h function AH=Ch, Seek. |
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| 25 | ; |
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| 26 | ; AHCh_HandlerForSeek |
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| 27 | ; Parameters: |
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| 28 | ; CX, DH: Same as in INTPACK |
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| 29 | ; DL: Translated Drive number |
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| 30 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 31 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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| 32 | ; Parameters on INTPACK: |
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| 33 | ; CH: Cylinder number, bits 7...0 |
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| 34 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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| 35 | ; Bits 5...0: Starting sector number (1...63) |
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| 36 | ; DH: Starting head number (0...255) |
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| 37 | ; Returns with INTPACK: |
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| 38 | ; AH: BIOS Error code |
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| 39 | ; CF: 0 if successful, 1 if error |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ALIGN JUMP_ALIGN |
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| 42 | AHCh_HandlerForSeek: |
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| 43 | %ifndef USE_186 |
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| 44 | call AHCh_SeekToCylinder |
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| 45 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 46 | %else |
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| 47 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 48 | ; Fall to AHCh_SeekToCylinder |
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| 49 | %endif |
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| 50 | |
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| 51 | ;-------------------------------------------------------------------- |
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| 52 | ; AHCh_SeekToCylinder |
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| 53 | ; Parameters: |
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| 54 | ; CH: Cylinder number, bits 7...0 |
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| 55 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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| 56 | ; Bits 5...0: Starting sector number (1...63) |
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| 57 | ; DH: Starting head number (0...255) |
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| 58 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 59 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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| 60 | ; Returns: |
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| 61 | ; AH: BIOS Error code |
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| 62 | ; CF: 0 if successful, 1 if error |
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| 63 | ; Corrupts registers: |
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| 64 | ; AL, BX, CX, DX |
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| 65 | ;-------------------------------------------------------------------- |
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| 66 | AHCh_SeekToCylinder: |
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| 67 | mov ah, COMMAND_SEEK |
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| 68 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 69 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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