[150] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : IDE Device transfer functions. |
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| 3 | |
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[376] | 4 | ; |
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[445] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[376] | 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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[445] | 12 | ; |
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[376] | 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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[445] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[445] | 18 | ; |
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[376] | 19 | |
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[150] | 20 | ; Structure containing variables for PIO transfer functions. |
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| 21 | ; This struct must not be larger than IDEPACK without INTPACK. |
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[414] | 22 | struc PIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc. |
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| 23 | .wDataPort resb 2 ; 0-1, IDE Data Port |
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| 24 | .fnXfer resb 2 ; 2-3, Offset to transfer function |
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| 25 | .wSectorsInBlock resb 2 ; 4-5, Block size in sectors |
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[363] | 26 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer |
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[218] | 27 | resb 1 ; 7, IDEPACK.bDeviceControl |
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[363] | 28 | .bSectorsDone resb 1 ; 8, Number of sectors xferred |
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[150] | 29 | endstruc |
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| 30 | |
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| 31 | |
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| 32 | ; Section containing code |
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| 33 | SECTION .text |
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| 34 | |
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| 35 | ;-------------------------------------------------------------------- |
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| 36 | ; IdeTransfer_StartWithCommandInAL |
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| 37 | ; Parameters: |
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| 38 | ; AL: IDE command that was used to start the transfer |
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[171] | 39 | ; (all PIO read and write commands including Identify Device) |
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[218] | 40 | ; ES:SI: Ptr to normalized data buffer |
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[150] | 41 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 42 | ; SS:BP: Ptr to IDEPACK |
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| 43 | ; Returns: |
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| 44 | ; AH: INT 13h Error Code |
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[218] | 45 | ; CX: Number of successfully transferred sectors |
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[150] | 46 | ; CF: Cleared if success, Set if error |
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| 47 | ; Corrupts registers: |
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[218] | 48 | ; AL, BX, DX, SI, ES |
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[150] | 49 | ;-------------------------------------------------------------------- |
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| 50 | ALIGN JUMP_ALIGN |
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| 51 | IdeTransfer_StartWithCommandInAL: |
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[157] | 52 | ; Are we reading or writing? |
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[171] | 53 | 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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[242] | 54 | mov ah, [bp+IDEPACK.bSectorCount] |
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| 55 | jnz SHORT WriteToDrive |
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[171] | 56 | cmp al, COMMAND_WRITE_MULTIPLE |
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[242] | 57 | je SHORT WriteToDrive |
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| 58 | ; Fall to ReadFromDrive |
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[150] | 59 | |
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| 60 | ;-------------------------------------------------------------------- |
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[242] | 61 | ; ReadFromDrive |
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[150] | 62 | ; Parameters: |
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[242] | 63 | ; AH: Number of sectors to transfer (1...128) |
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| 64 | ; ES:SI: Normalized ptr to buffer to receive data |
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[150] | 65 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 66 | ; SS:BP: Ptr to PIOVARS |
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| 67 | ; Returns: |
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[242] | 68 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[150] | 69 | ; AH: BIOS Error code |
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[218] | 70 | ; CX: Number of successfully transferred sectors |
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[294] | 71 | ; CF: 0 if transfer successful |
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[150] | 72 | ; 1 if any error |
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| 73 | ; Corrupts registers: |
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[218] | 74 | ; AL, BX, DX, SI, ES |
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[150] | 75 | ;-------------------------------------------------------------------- |
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[242] | 76 | ReadFromDrive: |
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| 77 | ; Prepare to read data to ESSI |
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| 78 | mov bx, g_rgfnPioRead |
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| 79 | call InitializePiovarsInSSBPwithSectorCountInAH |
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| 80 | |
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| 81 | ; Wait until drive is ready to transfer |
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| 82 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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[218] | 83 | jc SHORT ReturnWithTransferErrorInAH |
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[242] | 84 | xchg si, di ; ES:DI now points buffer |
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[218] | 85 | |
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[363] | 86 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128 |
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[242] | 87 | |
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[150] | 88 | ALIGN JUMP_ALIGN |
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[242] | 89 | .ReadNextBlockFromDrive: |
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[150] | 90 | mov dx, [bp+PIOVARS.wDataPort] |
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[363] | 91 | cmp [bp+PIOVARS.bSectorsLeft], cl |
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[242] | 92 | jbe SHORT .ReadLastBlockFromDrive |
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[218] | 93 | call [bp+PIOVARS.fnXfer] |
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[169] | 94 | |
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[218] | 95 | ; Wait until ready for next block and check for errors |
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[242] | 96 | xchg di, si ; DS:DI now points DPT |
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[218] | 97 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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| 98 | jc SHORT ReturnWithTransferErrorInAH |
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[242] | 99 | xchg si, di ; ES:DI now points buffer |
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[169] | 100 | |
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[363] | 101 | ; Increment number of successfully read sectors |
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| 102 | mov cx, [bp+PIOVARS.wSectorsInBlock] |
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| 103 | sub [bp+PIOVARS.bSectorsLeft], cl |
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| 104 | add [bp+PIOVARS.bSectorsDone], cl |
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[242] | 105 | jmp SHORT .ReadNextBlockFromDrive |
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[150] | 106 | |
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| 107 | ALIGN JUMP_ALIGN |
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[242] | 108 | .ReadLastBlockFromDrive: |
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[363] | 109 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero |
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[419] | 110 | push cx |
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[150] | 111 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 112 | |
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[242] | 113 | ; Check for errors in last block |
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| 114 | mov di, si ; DS:DI now points DPT |
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| 115 | CheckErrorsAfterTransferringLastBlock: |
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[417] | 116 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY) |
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[242] | 117 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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[419] | 118 | pop cx ; [bp+PIOVARS.bSectorsLeft] |
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| 119 | jc SHORT ReturnWithTransferErrorInAH |
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[150] | 120 | |
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[445] | 121 | ; All sectors successfully transferred |
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[419] | 122 | add cx, [bp+PIOVARS.bSectorsDone] ; Never sets CF |
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| 123 | ret |
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| 124 | |
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[242] | 125 | ; Return number of successfully read sectors |
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| 126 | ReturnWithTransferErrorInAH: |
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[370] | 127 | %ifdef USE_386 |
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| 128 | movzx cx, [bp+PIOVARS.bSectorsDone] |
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| 129 | %else |
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[363] | 130 | mov cl, [bp+PIOVARS.bSectorsDone] |
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| 131 | mov ch, 0 ; Preserve CF |
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[370] | 132 | %endif |
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[242] | 133 | ret |
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| 134 | |
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| 135 | |
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[150] | 136 | ;-------------------------------------------------------------------- |
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[242] | 137 | ; WriteToDrive |
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[150] | 138 | ; Parameters: |
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[242] | 139 | ; AH: Number of sectors to transfer (1...128) |
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| 140 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 141 | ; ES:SI: Normalized ptr to buffer containing data |
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[150] | 142 | ; SS:BP: Ptr to PIOVARS |
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| 143 | ; Returns: |
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| 144 | ; AH: BIOS Error code |
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[218] | 145 | ; CX: Number of successfully transferred sectors |
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[294] | 146 | ; CF: 0 if transfer successful |
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[150] | 147 | ; 1 if any error |
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| 148 | ; Corrupts registers: |
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[218] | 149 | ; AL, BX, DX, SI, ES |
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[150] | 150 | ;-------------------------------------------------------------------- |
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| 151 | ALIGN JUMP_ALIGN |
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[242] | 152 | WriteToDrive: |
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| 153 | ; Prepare to write data from ESSI |
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| 154 | mov bx, g_rgfnPioWrite |
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| 155 | call InitializePiovarsInSSBPwithSectorCountInAH |
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| 156 | |
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| 157 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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| 158 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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| 159 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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[218] | 160 | jc SHORT ReturnWithTransferErrorInAH |
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[150] | 161 | |
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[363] | 162 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128 |
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[242] | 163 | |
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[218] | 164 | ALIGN JUMP_ALIGN |
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[242] | 165 | .WriteNextBlockToDrive: |
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[150] | 166 | mov dx, [bp+PIOVARS.wDataPort] |
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[363] | 167 | cmp [bp+PIOVARS.bSectorsLeft], cl |
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[242] | 168 | jbe SHORT .WriteLastBlockToDrive |
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[218] | 169 | call [bp+PIOVARS.fnXfer] |
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[169] | 170 | |
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[218] | 171 | ; Wait until ready for next block and check for errors |
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| 172 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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| 173 | jc SHORT ReturnWithTransferErrorInAH |
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[150] | 174 | |
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[363] | 175 | ; Increment number of successfully written sectors |
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| 176 | mov cx, [bp+PIOVARS.wSectorsInBlock] |
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| 177 | sub [bp+PIOVARS.bSectorsLeft], cl |
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| 178 | add [bp+PIOVARS.bSectorsDone], cl |
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[242] | 179 | jmp SHORT .WriteNextBlockToDrive |
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[169] | 180 | |
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[150] | 181 | ALIGN JUMP_ALIGN |
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[242] | 182 | .WriteLastBlockToDrive: |
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[363] | 183 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero |
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[419] | 184 | push cx |
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[242] | 185 | %ifdef USE_186 |
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| 186 | push CheckErrorsAfterTransferringLastBlock |
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| 187 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 188 | %else |
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[150] | 189 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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[242] | 190 | jmp SHORT CheckErrorsAfterTransferringLastBlock |
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| 191 | %endif |
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[218] | 192 | |
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[150] | 193 | |
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| 194 | ;-------------------------------------------------------------------- |
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[218] | 195 | ; InitializePiovarsInSSBPwithSectorCountInAH |
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[150] | 196 | ; Parameters: |
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[218] | 197 | ; AH: Number of sectors to transfer (1...128) |
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[150] | 198 | ; BX: Offset to transfer function lookup table |
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| 199 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[169] | 200 | ; SS:BP: Ptr to PIOVARS |
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[167] | 201 | ; Returns: |
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[169] | 202 | ; Nothing |
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[150] | 203 | ; Corrupts registers: |
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[242] | 204 | ; AX, BX, DX |
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[150] | 205 | ;-------------------------------------------------------------------- |
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| 206 | ALIGN JUMP_ALIGN |
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[218] | 207 | InitializePiovarsInSSBPwithSectorCountInAH: |
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[473] | 208 | ; Store sizes and Data Port |
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[363] | 209 | mov [bp+PIOVARS.bSectorsLeft], ah |
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[473] | 210 | mov ax, [di+DPT.wBasePort] |
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| 211 | mov [bp+PIOVARS.wDataPort], ax |
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[370] | 212 | eMOVZX ax, [di+DPT_ATA.bBlockSize] |
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[363] | 213 | mov [bp+PIOVARS.wSectorsInBlock], ax |
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| 214 | mov [bp+PIOVARS.bSectorsDone], ah ; Zero |
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[150] | 215 | |
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| 216 | ; Get transfer function based on bus type |
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[158] | 217 | xchg ax, bx ; Lookup table offset to AX |
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[400] | 218 | mov bl, [di+DPT_ATA.bDevice] |
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[150] | 219 | add bx, ax |
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| 220 | mov ax, [cs:bx] ; Load offset to transfer function |
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| 221 | mov [bp+PIOVARS.fnXfer], ax |
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| 222 | ret |
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| 223 | |
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| 224 | |
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[400] | 225 | |
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[150] | 226 | ; Lookup tables to get transfer function based on bus type |
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| 227 | ALIGN WORD_ALIGN |
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| 228 | g_rgfnPioRead: |
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[473] | 229 | %ifdef USE_AT |
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| 230 | dw IdePioBlock_ReadFrom16bitDataPort ; 0, DEVICE_16BIT_ATA |
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| 231 | dw IdePioBlock_ReadFrom32bitDataPort ; 1, DEVICE_32BIT_ATA |
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| 232 | %else |
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| 233 | dd 0 |
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| 234 | %endif |
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[400] | 235 | %ifdef MODULE_8BIT_IDE |
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[473] | 236 | dw IdePioBlock_ReadFromXtideRev1 ; 2, DEVICE_8BIT_XTIDE_REV1 |
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| 237 | %ifndef USE_AT |
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| 238 | g_rgfnPioWrite: |
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[400] | 239 | %endif |
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[473] | 240 | dw IdePioBlock_ReadFromXtideRev2 ; 3, DEVICE_8BIT_XTIDE_REV2 |
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| 241 | dw IdePioBlock_ReadFrom8bitDataPort ; 4, DEVICE_8BIT_XTCF_PIO8 |
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| 242 | %endif |
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[400] | 243 | |
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[401] | 244 | %ifdef USE_AT |
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[473] | 245 | g_rgfnPioWrite: |
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| 246 | dw IdePioBlock_WriteTo16bitDataPort ; 0, DEVICE_16BIT_ATA |
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| 247 | dw IdePioBlock_WriteTo32bitDataPort ; 1, DEVICE_32BIT_ATA |
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[401] | 248 | %endif |
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[400] | 249 | %ifdef MODULE_8BIT_IDE |
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[473] | 250 | dw IdePioBlock_WriteToXtideRev1 ; 2, DEVICE_8BIT_XTIDE_REV1 |
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| 251 | dw IdePioBlock_WriteToXtideRev2 ; 3, DEVICE_8BIT_XTIDE_REV2 |
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| 252 | dw IdePioBlock_WriteTo8bitDataPort ; 4, DEVICE_8BIT_XTCF_PIO8 |
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[361] | 253 | %endif |
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