[165] | 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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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[526] | 12 | ; |
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[376] | 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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[526] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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[376] | 19 | |
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[165] | 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=41h, Check if Extensions Present. |
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| 25 | ; |
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| 26 | ; AH41h_HandlerForCheckIfExtensionsPresent |
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| 27 | ; Parameters: |
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| 28 | ; DL: Translated Drive number |
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| 29 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 30 | ; SS:BP: Ptr to IDEPACK |
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| 31 | ; Parameters on INTPACK: |
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| 32 | ; BX: 55AAh |
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| 33 | ; Returns with INTPACK: |
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| 34 | ; AH: Major version of EBIOS extensions |
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[167] | 35 | ; BX: AA55h |
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[165] | 36 | ; CX: Support bits |
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[294] | 37 | ; CF: 0 if successful, 1 if error |
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[165] | 38 | ;-------------------------------------------------------------------- |
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| 39 | AH41h_HandlerForCheckIfExtensionsPresent: |
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| 40 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh |
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| 41 | jne SHORT .EbiosNotSupported |
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| 42 | |
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[167] | 43 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION |
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| 44 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h |
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[535] | 45 | |
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[550] | 46 | %ifdef MODULE_COMPATIBLE_TABLES |
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[535] | 47 | call AH41h_GetSupportBitsToCX |
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| 48 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx |
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| 49 | %else |
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[165] | 50 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT |
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[550] | 51 | %endif ; MODULE_COMPATIBLE_TABLES |
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[535] | 52 | |
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[165] | 53 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared |
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| 54 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode |
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| 55 | .EbiosNotSupported: |
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[417] | 56 | jmp Int13h_DirectCallToAnotherBios |
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[535] | 57 | |
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| 58 | |
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[550] | 59 | %ifdef MODULE_COMPATIBLE_TABLES |
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[535] | 60 | ;-------------------------------------------------------------------- |
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| 61 | ; AH41h_GetSupportBitsToCX |
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| 62 | ; Parameters: |
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| 63 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 64 | ; Returns: |
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| 65 | ; CX: Support bits returned by AH=41h |
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| 66 | ; Corrupts registers: |
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| 67 | ; Nothing |
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| 68 | ;-------------------------------------------------------------------- |
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| 69 | AH41h_GetSupportBitsToCX: |
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| 70 | mov cx, ENHANCED_DRIVE_ACCESS_SUPPORT |
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| 71 | |
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| 72 | ; DPTE needs buffer from RAM so do not return it in lite mode |
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| 73 | %ifndef USE_AT |
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| 74 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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| 75 | jz SHORT .DoNotSetEDDflag |
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| 76 | %endif |
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| 77 | |
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| 78 | %ifdef MODULE_8BIT_IDE OR MODULE_SERIAL |
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| 79 | ; DPTE contains information for device drivers. We should not return |
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| 80 | ; DPTE for 8-bit devices since software would think they are 16-bit devices. |
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| 81 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_ATA |
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| 82 | jae SHORT .DoNotSetEDDflag |
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| 83 | %endif |
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| 84 | |
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| 85 | or cl, ENHANCED_DISK_DRIVE_SUPPORT ; AH=48h returns DPTE |
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| 86 | .DoNotSetEDDflag: |
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| 87 | ret |
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| 88 | |
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[550] | 89 | %endif ; MODULE_COMPATIBLE_TABLES |
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