[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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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[480] | 40 | ; ES:SI: Ptr to 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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[480] | 64 | ; ES:SI: 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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[480] | 141 | ; ES:SI: 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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[480] | 200 | ; ES:SI: Ptr to data buffer |
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[169] | 201 | ; SS:BP: Ptr to PIOVARS |
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[167] | 202 | ; Returns: |
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[169] | 203 | ; Nothing |
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[150] | 204 | ; Corrupts registers: |
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[242] | 205 | ; AX, BX, DX |
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[150] | 206 | ;-------------------------------------------------------------------- |
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| 207 | ALIGN JUMP_ALIGN |
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[218] | 208 | InitializePiovarsInSSBPwithSectorCountInAH: |
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[473] | 209 | ; Store sizes and Data Port |
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[363] | 210 | mov [bp+PIOVARS.bSectorsLeft], ah |
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[473] | 211 | mov ax, [di+DPT.wBasePort] |
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| 212 | mov [bp+PIOVARS.wDataPort], ax |
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[370] | 213 | eMOVZX ax, [di+DPT_ATA.bBlockSize] |
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[363] | 214 | mov [bp+PIOVARS.wSectorsInBlock], ax |
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| 215 | mov [bp+PIOVARS.bSectorsDone], ah ; Zero |
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[150] | 216 | |
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| 217 | ; Get transfer function based on bus type |
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[158] | 218 | xchg ax, bx ; Lookup table offset to AX |
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[400] | 219 | mov bl, [di+DPT_ATA.bDevice] |
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[493] | 220 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[480] | 221 | mov dl, bl |
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| 222 | %endif |
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[150] | 223 | add bx, ax |
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| 224 | mov ax, [cs:bx] ; Load offset to transfer function |
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| 225 | mov [bp+PIOVARS.fnXfer], ax |
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[480] | 226 | |
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| 227 | ; Normalize pointer for PIO-transfers and convert to physical address for DMA transfers |
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[493] | 228 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[480] | 229 | cmp dl, DEVICE_8BIT_XTCF_DMA |
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| 230 | jb SHORT IdeTransfer_NormalizePointerInESSI |
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| 231 | |
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| 232 | ; Convert ES:SI to physical address |
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[491] | 233 | %ifdef USE_186 ; Bytes EU Cycles(286) |
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| 234 | mov ax, es ; 2 2 |
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| 235 | rol ax, 4 ; 3 9 |
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| 236 | mov dx, ax ; 2 2 |
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| 237 | and ax, BYTE 0Fh; 3 3 |
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| 238 | xor dx, ax ; 2 2 |
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| 239 | add si, dx ; 2 2 |
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| 240 | adc al, ah ; 2 2 |
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| 241 | mov es, ax ; 2 2 |
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| 242 | ;------------------------------------ |
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| 243 | ; 18 24 |
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| 244 | %else ; 808x |
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| 245 | |
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| 246 | %if 0 |
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| 247 | ; Bytes EU Cycles(808x) |
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| 248 | mov al, 4 ; 2 4 |
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| 249 | mov dx, es ; 2 2 |
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| 250 | xchg cx, ax ; 1 3 |
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| 251 | rol dx, cl ; 2 24 |
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| 252 | mov cx, dx ; 2 2 |
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| 253 | xchg cx, ax ; 1 3 |
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| 254 | and ax, BYTE 0Fh; 3 4 |
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| 255 | xor dx, ax ; 2 3 |
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| 256 | add si, dx ; 2 3 |
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| 257 | adc al, ah ; 2 3 |
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| 258 | mov es, ax ; 2 2 |
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| 259 | ;------------------------------------ |
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| 260 | ; 21 53 |
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| 261 | ; |
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| 262 | ; Judging by the Execution Unit cycle count the above block of code is |
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| 263 | ; apparently slower. However, the shifts and rotates in the block below |
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| 264 | ; execute faster than the Bus Interface Unit on an 8088 can fetch them, |
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| 265 | ; thus causing the EU to starve. The difference in true execution speed |
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| 266 | ; (if any) might not be worth the extra 5 bytes. |
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| 267 | ; In other words, we could use a real world test here. |
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| 268 | ; |
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| 269 | %endif ; 0 |
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| 270 | ; Bytes EU Cycles(808x/286) |
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| 271 | xor dx, dx ; 2 3/2 |
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| 272 | mov ax, es ; 2 2/2 |
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[480] | 273 | %rep 4 |
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[491] | 274 | shl ax, 1 ; 8 8/8 |
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| 275 | rcl dx, 1 ; 8 8/8 |
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[480] | 276 | %endrep |
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[491] | 277 | add si, ax ; 2 3/2 |
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| 278 | adc dl, dh ; 2 3/2 |
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| 279 | mov es, dx ; 2 2/2 |
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| 280 | ;------------------------------------ |
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| 281 | %endif ; 26 29/26 |
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[150] | 282 | ret |
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[493] | 283 | %endif ; MODULE_8BIT_IDE_ADVANCED |
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[480] | 284 | ; Fall to IdeTransfer_NormalizePointerInESSI if no MODULE_8BIT_IDE |
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[150] | 285 | |
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| 286 | |
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[480] | 287 | ;-------------------------------------------------------------------- |
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| 288 | ; IdeTransfer_NormalizePointerInESSI |
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| 289 | ; Parameters: |
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| 290 | ; ES:SI: Ptr to be normalized |
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| 291 | ; Returns: |
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| 292 | ; ES:SI: Normalized pointer (SI = 0...15) |
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| 293 | ; Corrupts registers: |
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| 294 | ; AX, DX |
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| 295 | ;-------------------------------------------------------------------- |
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| 296 | IdeTransfer_NormalizePointerInESSI: |
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| 297 | NORMALIZE_FAR_POINTER es, si, ax, dx |
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| 298 | ret |
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[400] | 299 | |
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[480] | 300 | |
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[150] | 301 | ; Lookup tables to get transfer function based on bus type |
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| 302 | ALIGN WORD_ALIGN |
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| 303 | g_rgfnPioRead: |
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[473] | 304 | dw IdePioBlock_ReadFrom16bitDataPort ; 0, DEVICE_16BIT_ATA |
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| 305 | dw IdePioBlock_ReadFrom32bitDataPort ; 1, DEVICE_32BIT_ATA |
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[400] | 306 | %ifdef MODULE_8BIT_IDE |
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[480] | 307 | dw IdePioBlock_ReadFrom8bitDataPort ; 2, DEVICE_8BIT_ATA |
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[491] | 308 | dw IdePioBlock_ReadFromXtideRev1 ; 3, DEVICE_8BIT_XTIDE_REV1 |
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[480] | 309 | dw IdePioBlock_ReadFromXtideRev2 ; 4, DEVICE_8BIT_XTIDE_REV2 |
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[493] | 310 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[480] | 311 | dw IdePioBlock_ReadFrom8bitDataPort ; 5, DEVICE_8BIT_XTCF_PIO8 |
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| 312 | dw IdeDmaBlock_ReadFromXTCF ; 6, DEVICE_8BIT_XTCF_DMA |
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[473] | 313 | %endif |
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[493] | 314 | %endif |
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[400] | 315 | |
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[480] | 316 | |
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[473] | 317 | g_rgfnPioWrite: |
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| 318 | dw IdePioBlock_WriteTo16bitDataPort ; 0, DEVICE_16BIT_ATA |
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| 319 | dw IdePioBlock_WriteTo32bitDataPort ; 1, DEVICE_32BIT_ATA |
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[400] | 320 | %ifdef MODULE_8BIT_IDE |
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[480] | 321 | dw IdePioBlock_WriteTo8bitDataPort ; 2, DEVICE_8BIT_ATA |
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| 322 | dw IdePioBlock_WriteToXtideRev1 ; 3, DEVICE_8BIT_XTIDE_REV1 |
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| 323 | dw IdePioBlock_WriteToXtideRev2 ; 4, DEVICE_8BIT_XTIDE_REV2 |
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[526] | 324 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[480] | 325 | dw IdePioBlock_WriteTo8bitDataPort ; 5, DEVICE_8BIT_XTCF_PIO8 |
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| 326 | dw IdeDmaBlock_WriteToXTCF ; 6, DEVICE_8BIT_XTCF_DMA |
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[361] | 327 | %endif |
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[493] | 328 | %endif |
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