[471] | 1 | ; Project name : XTIDE Universal BIOS
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[545] | 2 | ; Description : Int 13h function AH=1Eh, Lo-tech XT-CF features
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| 3 | ;
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| 4 | ; More information at http://www.lo-tech.co.uk/XT-CF
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[471] | 5 |
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| 6 | ;
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[491] | 7 | ; XTIDE Universal BIOS and Associated Tools
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[526] | 8 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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[471] | 9 | ;
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| 10 | ; This program is free software; you can redistribute it and/or modify
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| 11 | ; it under the terms of the GNU General Public License as published by
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| 12 | ; the Free Software Foundation; either version 2 of the License, or
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| 13 | ; (at your option) any later version.
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[491] | 14 | ;
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[471] | 15 | ; This program is distributed in the hope that it will be useful,
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| 16 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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[491] | 18 | ; GNU General Public License for more details.
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[471] | 19 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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[491] | 20 | ;
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[471] | 21 |
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| 22 | ; Section containing code
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| 23 | SECTION .text
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| 24 |
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| 25 | ;--------------------------------------------------------------------
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| 26 | ; Int 13h function AH=1Eh, Lo-tech XT-CF features.
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| 27 | ; This function is supported only by XTIDE Universal BIOS.
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| 28 | ;
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| 29 | ; AH1Eh_HandlerForXTCFfeatures
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| 30 | ; Parameters:
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| 31 | ; AL, CX: Same as in INTPACK
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| 32 | ; DL: Translated Drive number
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| 33 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 34 | ; SS:BP: Ptr to IDEPACK
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| 35 | ; Parameters on INTPACK:
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| 36 | ; AL: XT-CF subcommand (see XTCF.inc for more info)
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| 37 | ; Returns with INTPACK:
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| 38 | ; AH: Int 13h return status
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| 39 | ; CF: 0 if successful, 1 if error
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[558] | 40 | ; DX: Command return values (see XTCF.inc)
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[471] | 41 | ;--------------------------------------------------------------------
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| 42 | AH1Eh_HandlerForXTCFfeatures:
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| 43 | %ifndef USE_186
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[475] | 44 | call ProcessXTCFsubcommandFromAL
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[471] | 45 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 46 | %else
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[558] | 47 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[475] | 48 | ; Fall to ProcessXTCFsubcommandFromAL
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[471] | 49 | %endif
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| 50 |
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| 51 |
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| 52 | ;--------------------------------------------------------------------
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[475] | 53 | ; ProcessXTCFsubcommandFromAL
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[471] | 54 | ; Parameters:
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[473] | 55 | ; AL: XT-CF subcommand (see XTCF.inc for more info)
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[471] | 56 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 57 | ; SS:BP: Ptr to IDEPACK
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| 58 | ; Returns:
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| 59 | ; AH: Int 13h return status
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| 60 | ; CF: 0 if successful, 1 if error
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| 61 | ; Corrupts registers:
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[473] | 62 | ; AL, BX, CX, DX, SI
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[471] | 63 | ;--------------------------------------------------------------------
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[475] | 64 | ProcessXTCFsubcommandFromAL:
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[472] | 65 | ; IS_THIS_DRIVE_XTCF. We check this for all commands.
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[473] | 66 | call AccessDPT_IsThisDeviceXTCF
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[588] | 67 | jc SHORT .XTCFnotFound
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[558] | 68 | and ax, 0FFh ; Subcommand now in AX (clears AH and CF)
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[545] | 69 | jz SHORT .XTCFfound ; Sub-function IS_THIS_DRIVE_XTCF (=0)
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[472] | 70 |
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[545] | 71 | dec ax ; Test subcommand...
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| 72 | jz SHORT .SetXTCFtransferMode ; ...for value 1 (SET_XTCF_TRANSFER_MODE)
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[491] | 73 |
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[545] | 74 | dec ax ; Test subcommand for value 2 (GET_XTCF_TRANSFER_MODE)
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[558] | 75 | jnz SHORT .AH1Eh_LoadInvalidCommandToAHandSetCF
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[473] | 76 |
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[545] | 77 | ; GET_XTCF_TRANSFER_MODE
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| 78 | call AH1Eh_GetCurrentXTCFmodeToAX
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[558] | 79 | mov dh, al
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[545] | 80 | mov dl, [di+DPT_ATA.bBlockSize]
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[558] | 81 | mov [bp+IDEPACK.intpack+INTPACK.dx], dx ; Return mode value (DH) and block size (DL) via INTPACK
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[545] | 82 | .XTCFfound:
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[558] | 83 | ret ; With AH and CF cleared
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[473] | 84 |
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[545] | 85 | .XTCFnotFound:
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| 86 | .AH1Eh_LoadInvalidCommandToAHandSetCF:
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[558] | 87 | stc ; Set carry flag since XT-CF not found or invalid subcommand
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[545] | 88 | mov ah, RET_HD_INVALID
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[558] | 89 | ret
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[545] | 90 |
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| 91 | .SetXTCFtransferMode:
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[558] | 92 | mov al, [bp+IDEPACK.intpack+INTPACK.dh] ; Get specified mode (eg XTCF_DMA_MODE)
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| 93 | ; Fall to AH1Eh_ChangeXTCFmodeBasedOnModeInAL
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[545] | 94 |
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| 95 |
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[473] | 96 | ;--------------------------------------------------------------------
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[545] | 97 | ; AH1Eh_ChangeXTCFmodeBasedOnModeInAL
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[473] | 98 | ; Parameters:
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[545] | 99 | ; AL: XT-CF Mode (see XTCF.inc)
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[473] | 100 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 101 | ; SS:BP: Ptr to IDEPACK
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[558] | 102 | ; Returns:
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[473] | 103 | ; AH: Int 13h return status
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| 104 | ; CF: 0 if successful, 1 if error
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| 105 | ; Corrupts registers:
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| 106 | ; AL, BX, CX, DX, SI
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| 107 | ;--------------------------------------------------------------------
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[545] | 108 | AH1Eh_ChangeXTCFmodeBasedOnModeInAL:
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| 109 | ; Note: Control register (as of XT-CFv3) is now a write-only register,
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[558] | 110 | ; whose purpose is *only* to raise DRQ. The register cannot be read.
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[545] | 111 | ; Selected transfer mode is stored in BIOS variable (DPT_ATA.bDevice).
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[472] | 112 |
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[588] | 113 | ; Note that when selecting 'XTCF_8BIT_PIO_MODE_WITH_BIU_OFFLOAD' mode,
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[545] | 114 | ; the ATA device (i.e. CompactFlash card) will operate in 8-bit mode, but
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[558] | 115 | ; data will be transferred from its data register using 16-bit CPU instructions
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[545] | 116 | ; like REP INSW. This works because XT-CF adapters are 8-bit cards, and
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| 117 | ; the BIU in the machine splits each WORD requested by the CPU into two 8-bit
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| 118 | ; ISA cycles at base+0h and base+1h. The XT-CF cards do not decode A0, hence
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| 119 | ; both accesses appear the same to the card and the BIU then re-constructs
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| 120 | ; the data for presentation to the CPU.
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| 121 | ;
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[558] | 122 | ; Also note that some machines, noteably the Olivetti M24 (also known as
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[592] | 123 | ; the AT&T PC6300 or Xerox 6060 or Logabax Persona 1600), have hardware errors
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| 124 | ; in the BIU logic, resulting in reversed byte ordering. Therefore,
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| 125 | ; XTCF_8BIT_PIO_MODE is the default transfer mode for best system compatibility.
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[545] | 126 |
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[588] | 127 |
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| 128 | ; Is requested mode valid?
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| 129 | cmp al, 3 ; Valid modes are 0...3
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| 130 | ja SHORT ProcessXTCFsubcommandFromAL.AH1Eh_LoadInvalidCommandToAHandSetCF
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| 131 |
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| 132 | ; Convert mode to XT-CF device type (see RomVars.inc and XTCF.inc for full details)
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| 133 | eSHL_IM al, 1 ; Shift requested mode
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| 134 | add al, XTCF_DEVICE_OFFSET ; Add the device offset (already shifted)
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| 135 | mov [di+DPT_ATA.bDevice], al ; Set the new mode (or device actually)
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| 136 |
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| 137 | cmp al, DEVICE_8BIT_XTCF_PIO16_WITH_BIU_OFFLOAD
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| 138 | je SHORT AH23h_Disable8bitPioMode
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| 139 |
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[558] | 140 | ; We always need to enable 8-bit mode since 16-bit mode is restored
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| 141 | ; when controller is reset (AH=00h or 0Dh)
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[588] | 142 |
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| 143 | cmp al, DEVICE_8BIT_XTCF_DMA
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| 144 | jne SHORT AH23h_Enable8bitPioMode
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| 145 |
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| 146 | ; DMA transfers have limited block size
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| 147 | mov al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
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| 148 | cmp [di+DPT_ATA.bBlockSize], al
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| 149 | jbe SHORT AH23h_Enable8bitPioMode ; No need to limit block size
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| 150 | call AH24h_SetBlockSize
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| 151 | jmp SHORT AH23h_Enable8bitPioMode
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| 152 |
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| 153 |
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[472] | 154 | ;--------------------------------------------------------------------
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[545] | 155 | ; AH1Eh_GetCurrentXTCFmodeToAX
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[472] | 156 | ; Parameters:
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[545] | 157 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[558] | 158 | ; Returns:
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[589] | 159 | ; AX: XT-CF mode (see XTCF.inc)
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[545] | 160 | ; CF: Clear
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[472] | 161 | ; Corrupts registers:
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[545] | 162 | ; Nothing
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[472] | 163 | ;--------------------------------------------------------------------
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[545] | 164 | AH1Eh_GetCurrentXTCFmodeToAX:
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[588] | 165 | mov ax, -XTCF_DEVICE_OFFSET & 0FFh
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| 166 | add al, [di+DPT_ATA.bDevice]
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| 167 | shr al, 1
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| 168 | ret
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| 169 |
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