[474] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : IDE Device DMA transfer functions. |
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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 | ; Structure containing variables for DMA transfer functions. |
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| 21 | ; This struct must not be larger than IDEPACK without INTPACK. |
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| 22 | struc DMAVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc. |
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[479] | 23 | .wTotalBytesXferred resb 2 ; 0-1, |
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| 24 | .wBytesLeftToXfer resb 2 ; 2-3, 0 = 65536 |
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[477] | 25 | .bbbPhysicalAddress resb 3 ; 4-6, |
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| 26 | resb 1 ; 7, IDEPACK.bDeviceControl |
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[474] | 27 | endstruc |
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| 28 | |
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| 29 | |
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| 30 | ; Section containing code |
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| 31 | SECTION .text |
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| 32 | |
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| 33 | ;-------------------------------------------------------------------- |
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| 34 | ; IdeDmaTransfer_StartWithCommandInAL |
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| 35 | ; Parameters: |
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| 36 | ; AL: IDE command that was used to start the transfer |
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| 37 | ; (all PIO read and write commands including Identify Device) |
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[477] | 38 | ; ES:SI: Ptr to data buffer (not normalized) |
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[474] | 39 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 40 | ; SS:BP: Ptr to IDEPACK |
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| 41 | ; Returns: |
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| 42 | ; AH: INT 13h Error Code |
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| 43 | ; CX: Number of successfully transferred sectors |
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| 44 | ; CF: Cleared if success, Set if error |
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| 45 | ; Corrupts registers: |
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[477] | 46 | ; AL, BX, DX |
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[474] | 47 | ;-------------------------------------------------------------------- |
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| 48 | ALIGN JUMP_ALIGN |
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| 49 | IdeDmaTransfer_StartWithCommandInAL: |
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[477] | 50 | ; Initialize DMAVARS |
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| 51 | xor cx, cx |
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[479] | 52 | mov [bp+DMAVARS.wTotalBytesXferred], cx |
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[477] | 53 | mov ch, [bp+IDEPACK.bSectorCount] ; CX = WORDs to transfer |
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| 54 | shl cx, 1 ; WORDs to BYTEs, 0 = 65536 |
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[479] | 55 | mov [bp+DMAVARS.wBytesLeftToXfer], cx |
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[477] | 56 | |
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| 57 | ; Convert Segment:Offset type pointer to physical address |
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| 58 | xor bx, bx |
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| 59 | mov cx, es |
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| 60 | %rep 4 |
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[479] | 61 | shl cx, 1 |
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| 62 | rcl bx, 1 |
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[477] | 63 | %endrep |
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| 64 | add cx, si |
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| 65 | adc bl, bh |
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| 66 | mov [bp+DMAVARS.bbbPhysicalAddress], cx |
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| 67 | mov [bp+DMAVARS.bbbPhysicalAddress+2], bl |
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| 68 | |
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[479] | 69 | ; Calculate bytes for first page |
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[477] | 70 | neg cx ; Max number of bytes for first page, 0 = 65536 |
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[479] | 71 | MIN_U cx, [bp+DMAVARS.wBytesLeftToXfer] |
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[477] | 72 | |
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| 73 | ; Are we reading or writing? |
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[479] | 74 | mov bl, CHANNEL_3 | READ | AUTOINIT_DISABLE | ADDRESS_INCREMENT | DEMAND_MODE ; Assume write command |
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[477] | 75 | test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands |
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[479] | 76 | jnz SHORT TransferBlockToOrFromXTCF |
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[477] | 77 | cmp al, COMMAND_WRITE_MULTIPLE |
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[479] | 78 | je SHORT TransferBlockToOrFromXTCF |
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[477] | 79 | |
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[479] | 80 | ; Read command |
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| 81 | mov bl, CHANNEL_3 | WRITE | AUTOINIT_DISABLE | ADDRESS_INCREMENT | DEMAND_MODE |
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| 82 | ; Fall to TransferBlockToOrFromXTCF |
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[477] | 83 | |
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[479] | 84 | |
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[477] | 85 | ;-------------------------------------------------------------------- |
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[479] | 86 | ; TransferBlockToOrFromXTCF |
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[477] | 87 | ; Parameters: |
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[479] | 88 | ; BX: Mode byte for DMA Mode Register |
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| 89 | ; CX: Bytes in first page |
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[477] | 90 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 91 | ; SS:BP: Ptr to DMAVARS |
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| 92 | ; Returns: |
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| 93 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 94 | ; AH: BIOS Error code |
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| 95 | ; CX: Number of successfully transferred sectors |
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| 96 | ; CF: 0 if transfer successful |
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| 97 | ; 1 if any error |
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| 98 | ; Corrupts registers: |
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| 99 | ; AL, BX, DX |
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| 100 | ;-------------------------------------------------------------------- |
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[479] | 101 | TransferBlockToOrFromXTCF: |
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[477] | 102 | ; 8-bit DMA transfers must be done withing 64k physical page. |
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| 103 | ; We support maximum of 128 sectors (65536 bytes) per one INT 13h call |
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| 104 | ; so we might need to separate transfer to 2 separate DMA operations. |
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| 105 | |
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| 106 | ; Transfer first DMA page |
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[479] | 107 | call StartDMAtransferForXTCFwithDmaModeInBL |
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| 108 | jcxz .ReturnNumberOfSectorsXferred ; One page was enough (128 sectors) |
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| 109 | mov [bp+DMAVARS.wTotalBytesXferred], cx ; Store total BYTEs transferred so far |
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[477] | 110 | |
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[479] | 111 | ; Get bytes left to transfer for second DMA page |
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| 112 | mov ax, [bp+DMAVARS.wBytesLeftToXfer] |
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| 113 | sub ax, cx |
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| 114 | jz SHORT .ReturnNumberOfSectorsXferred ; Transfer was within 64k page |
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| 115 | |
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| 116 | ; Increment address |
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| 117 | xchg cx, ax |
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| 118 | add [bp+DMAVARS.bbbPhysicalAddress], ax |
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| 119 | adc [bp+DMAVARS.bbbPhysicalAddress+2], bh ; Never sets CF |
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| 120 | |
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[477] | 121 | ; Transfer second DMA page if necessary (always less than 64k) |
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[479] | 122 | call StartDMAtransferForXTCFwithDmaModeInBL |
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| 123 | add [bp+DMAVARS.wTotalBytesXferred], cx |
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[477] | 124 | |
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[479] | 125 | .ReturnNumberOfSectorsXferred: |
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| 126 | ; Check errors |
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[478] | 127 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY) |
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| 128 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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| 129 | jc SHORT .ErrorInTransfer |
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[479] | 130 | |
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| 131 | ; Return number of sectors transferred |
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| 132 | mov cx, [bp+DMAVARS.wTotalBytesXferred] |
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| 133 | jcxz .FullPageOf128SectorsXferred |
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| 134 | %ifdef USE_186 |
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| 135 | shr cx, 9 ; BYTEs to sectors |
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| 136 | %else |
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| 137 | xchg cl, ch ; BYTEs to WORDs |
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| 138 | shr cx, 1 ; WORDs to sectors |
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| 139 | %endif |
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| 140 | clc |
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[477] | 141 | ret |
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| 142 | |
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[479] | 143 | .FullPageOf128SectorsXferred: |
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| 144 | mov cx, 128 |
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| 145 | ret |
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| 146 | |
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[478] | 147 | .ErrorInTransfer: |
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[479] | 148 | mov cx, 0 ; No way to know how many sectors got transferred |
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[478] | 149 | ret |
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[477] | 150 | |
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[478] | 151 | |
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[477] | 152 | ;-------------------------------------------------------------------- |
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[479] | 153 | ; StartDMAtransferForXTCFwithDmaModeInBL |
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[477] | 154 | ; Parameters: |
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[479] | 155 | ; BL: Byte for DMA Mode Register |
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| 156 | ; CX: Number of BYTEs to transfer |
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[477] | 157 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 158 | ; SS:BP: Ptr to DMAVARS |
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| 159 | ; Returns: |
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[478] | 160 | ; Nothing |
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[477] | 161 | ; Corrupts registers: |
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[478] | 162 | ; AL, DX |
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[477] | 163 | ;-------------------------------------------------------------------- |
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[478] | 164 | ALIGN JUMP_ALIGN |
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[479] | 165 | StartDMAtransferForXTCFwithDmaModeInBL: |
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[477] | 166 | ; Program 8-bit DMA Controller |
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| 167 | ; Disable Interrupts and DMA Channel 3 during DMA setup |
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| 168 | cli ; Disable interrupts |
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| 169 | mov al, SET_CH3_MASK_BIT |
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| 170 | out MASK_REGISTER_DMA8_out, al ; Disable DMA Channel 3 |
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| 171 | |
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| 172 | ; Set DMA Mode (read or write using channel 3) |
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[479] | 173 | mov al, bl |
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[477] | 174 | out MODE_REGISTER_DMA8_out, al |
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| 175 | |
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| 176 | ; Set address to DMA controller |
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| 177 | out CLEAR_FLIPFLOP_DMA8_out, al ; Reset flip-flop to low byte |
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| 178 | mov ax, [bp+DMAVARS.bbbPhysicalAddress] |
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| 179 | out BASE_AND_CURRENT_ADDRESS_REGISTER_DMA8_CH3_out, al ; Low byte |
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| 180 | mov al, ah |
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| 181 | out BASE_AND_CURRENT_ADDRESS_REGISTER_DMA8_CH3_out, al ; High byte |
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| 182 | mov al, [bp+DMAVARS.bbbPhysicalAddress+2] |
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| 183 | out PAGE_DMA8_CH_3, al |
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| 184 | |
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| 185 | ; Set number of bytes to transfer (DMA controller must be programmed number of bytes - 1) |
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| 186 | out CLEAR_FLIPFLOP_DMA8_out, al ; Reset flip-flop to low byte |
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| 187 | mov ax, cx |
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[479] | 188 | dec ax ; DMA controller is programmed for one byte less |
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[477] | 189 | out BASE_AND_CURRENT_COUNT_REGISTER_DMA8_CH3_out, al ; Low byte |
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| 190 | mov al, ah |
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| 191 | out BASE_AND_CURRENT_COUNT_REGISTER_DMA8_CH3_out, al ; High byte |
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| 192 | |
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| 193 | ; Enable DMA Channel 3 |
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| 194 | mov al, CLEAR_CH3_MASK_BIT |
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| 195 | out MASK_REGISTER_DMA8_out, al ; Enable DMA Channel 3 |
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| 196 | sti ; Enable interrupts |
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| 197 | |
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| 198 | |
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[479] | 199 | ; XT-CF transfers 16 bytes at a time. We need to manually |
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| 200 | ; start transfer for every block. |
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[477] | 201 | mov dx, [di+DPT.wBasePort] |
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| 202 | add dl, XTCF_CONTROL_REGISTER |
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[478] | 203 | ALIGN JUMP_ALIGN |
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[479] | 204 | .TransferNextBlock: |
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| 205 | mov al, RAISE_DRQ_AND_CLEAR_XTCF_XFER_COUNTER |
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| 206 | cli ; We want no ISR to read DMA Status Register before we do |
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| 207 | out dx, al ; Transfer up to 16 bytes to/from XT-CF card |
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| 208 | ; * Here XT-CF sets CPU to wait states during transfer * |
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| 209 | in al, STATUS_REGISTER_DMA8_in |
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| 210 | sti |
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| 211 | test al, FLG_CH3_HAS_REACHED_TERMINAL_COUNT |
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| 212 | jz SHORT .TransferNextBlock ; All bytes transferred? |
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[477] | 213 | |
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[479] | 214 | ; Restore XT-CF to normal operation |
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| 215 | mov al, XTCF_DMA_MODE |
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| 216 | out dx, al |
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[477] | 217 | ret |
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