[471] | 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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[472] | 40 | xor ah, ah ; Subcommand now in AX |
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[471] | 41 | %ifndef USE_186 |
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[472] | 42 | call AH1Eh_ProcessXTCFsubcommandFromAX |
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[471] | 43 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 44 | %else |
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| 45 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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[472] | 46 | ; Fall to AH1Eh_ProcessXTCFsubcommandFromAX |
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[471] | 47 | %endif |
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| 48 | |
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| 49 | |
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| 50 | ;-------------------------------------------------------------------- |
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[472] | 51 | ; AH1Eh_ProcessXTCFsubcommandFromAX |
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[471] | 52 | ; Parameters: |
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[472] | 53 | ; AX: XT-CF subcommand (see XTCF.inc for more info) |
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[471] | 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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[472] | 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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