| 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 | ;
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| 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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| 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=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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| 35 | ; BX: AA55h
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| 36 | ; CX: Support bits
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| 37 | ; CF: 0 if successful, 1 if error
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| 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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| 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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| 45 |
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| 46 | %ifdef CREATE_COMPATIBLE_DPT
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| 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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| 50 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT
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| 51 | %endif
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| 52 |
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| 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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| 56 | jmp Int13h_DirectCallToAnotherBios
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| 57 |
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| 58 |
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| 59 | %ifdef CREATE_COMPATIBLE_DPT
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| 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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| 89 | %endif ; CREATE_COMPATIBLE_DPT
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