| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=1Eh, Lo-tech XT-CF features.
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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=1Eh, Lo-tech XT-CF features.
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| 25 | ; This function is supported only by XTIDE Universal BIOS.
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| 26 | ;
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| 27 | ; AH1Eh_HandlerForXTCFfeatures
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| 28 | ; Parameters:
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| 29 | ; AL, CX: Same as in INTPACK
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| 30 | ; DL: Translated Drive number
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| 31 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 32 | ; SS:BP: Ptr to IDEPACK
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| 33 | ; Parameters on INTPACK:
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| 34 | ; AL: XT-CF subcommand (see XTCF.inc for more info)
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| 35 | ; Returns with INTPACK:
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| 36 | ; AH: Int 13h return status
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| 37 | ; CF: 0 if successful, 1 if error
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| 38 | ;--------------------------------------------------------------------
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| 39 | AH1Eh_HandlerForXTCFfeatures:
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| 40 | xor ah, ah ; Subcommand now in AX
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| 41 | %ifndef USE_186
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| 42 | call AH1Eh_ProcessXTCFsubcommandFromAX
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| 43 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 44 | %else
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| 45 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 46 | ; Fall to AH1Eh_ProcessXTCFsubcommandFromAX
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| 47 | %endif
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| 48 |
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| 49 |
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| 50 | ;--------------------------------------------------------------------
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| 51 | ; AH1Eh_ProcessXTCFsubcommandFromAX
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| 52 | ; Parameters:
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| 53 | ; AX: XT-CF subcommand (see XTCF.inc for more info)
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| 54 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 55 | ; SS:BP: Ptr to IDEPACK
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| 56 | ; Returns:
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| 57 | ; AH: Int 13h return status
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| 58 | ; CF: 0 if successful, 1 if error
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| 59 | ; Corrupts registers:
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| 60 | ; AL, BX, CX, DX
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| 61 | ;--------------------------------------------------------------------
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| 62 | AH1Eh_ProcessXTCFsubcommandFromAX:
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| 63 | ; IS_THIS_DRIVE_XTCF. We check this for all commands.
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| 64 | dec ax ; Subcommand
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| 65 | mov dx, [di+DPT.wXTCFport]
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| 66 | test dx, dx ; Never zero for XT-CF, Always zero for other devices
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| 67 | jz SHORT XTCFnotFound
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| 68 |
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| 69 | ; READ_XTCF_CONTROL_REGISTER_TO_DH
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| 70 | add dl, XTCF_CONTROL_REGISTER ; DX to Control Register
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| 71 | dec ax ; Subcommand
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| 72 | jnz SHORT .SkipReadXtcfControlRegisterToDH
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| 73 | in al, dx
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| 74 | mov [bp+IDEPACK.intpack+INTPACK.dh], al
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| 75 | jmp SHORT .ReturnWithSuccess
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| 76 | .SkipReadXtcfControlRegisterToDH:
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| 77 |
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| 78 | ; WRITE_DH_TO_XTCF_CONTROL_REGISTER
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| 79 | dec ax ; Subcommand
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| 80 | jnz SHORT XTCFnotFound ; Invalid subcommand
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| 81 | mov al, [bp+IDEPACK.intpack+INTPACK.dh]
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| 82 | out dx, al
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| 83 | .ReturnWithSuccess:
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| 84 | xor ah, ah
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| 85 | ret
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| 86 |
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| 87 |
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| 88 | ;--------------------------------------------------------------------
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| 89 | ; AH1Eh_DetectXTCFwithBasePortInDX
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| 90 | ; Parameters:
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| 91 | ; DX: Base I/O port address to check
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| 92 | ; Returns:
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| 93 | ; AH: RET_HD_SUCCESS if XT-CF is found from port
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| 94 | ; RET_HD_INVALID if XT-CF is not found
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| 95 | ; CF: Cleared if XT-CF found
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| 96 | ; Set if XT-CF not found
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| 97 | ; Corrupts registers:
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| 98 | ; AL, DX
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| 99 | ;--------------------------------------------------------------------
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| 100 | AH1Eh_DetectXTCFwithBasePortInDX:
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| 101 | add dl, XTCT_CONTROL_REGISTER_INVERTED_in ; set DX to XT-CF config register (inverted)
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| 102 | in al, dx ; get value
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| 103 | mov ah, al ; save in ah
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| 104 | inc dx ; set DX to XT-CF config register (non-inverted)
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| 105 | in al, dx ; get value
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| 106 | not al ; invert it
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| 107 | sub ah, al ; do they match? (clear AH if they do)
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| 108 | jz SHORT XTCFfound
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| 109 |
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| 110 | XTCFnotFound:
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| 111 | stc ; set carry flag since XT-CF not found
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| 112 | mov ah, RET_HD_INVALID
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| 113 | XTCFfound:
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| 114 | ret ; and return
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