[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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| 4 | ; Structure containing variables for PIO transfer functions. |
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| 5 | ; This struct must not be larger than IDEPACK without INTPACK. |
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| 6 | struc PIOVARS |
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[218] | 7 | .wWordsInBlock resb 2 ; 0, Block size in WORDs |
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| 8 | .wWordsLeft resb 2 ; 2, WORDs left to transfer |
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| 9 | .wWordsDone resb 2 ; 4, Number of sectors xferred |
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[223] | 10 | resb 1 ; 6, |
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[218] | 11 | resb 1 ; 7, IDEPACK.bDeviceControl |
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| 12 | .wDataPort resb 2 ; 8, IDE Data Port |
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| 13 | .fnXfer resb 2 ; 10, Offset to transfer function |
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[150] | 14 | endstruc |
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| 15 | |
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| 16 | |
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| 17 | ; Section containing code |
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| 18 | SECTION .text |
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| 19 | |
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| 20 | ;-------------------------------------------------------------------- |
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| 21 | ; IdeTransfer_StartWithCommandInAL |
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| 22 | ; Parameters: |
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| 23 | ; AL: IDE command that was used to start the transfer |
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[171] | 24 | ; (all PIO read and write commands including Identify Device) |
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[218] | 25 | ; ES:SI: Ptr to normalized data buffer |
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[150] | 26 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 27 | ; SS:BP: Ptr to IDEPACK |
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| 28 | ; Returns: |
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| 29 | ; AH: INT 13h Error Code |
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[218] | 30 | ; CX: Number of successfully transferred sectors |
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[150] | 31 | ; CF: Cleared if success, Set if error |
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| 32 | ; Corrupts registers: |
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[218] | 33 | ; AL, BX, DX, SI, ES |
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[150] | 34 | ;-------------------------------------------------------------------- |
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| 35 | ALIGN JUMP_ALIGN |
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| 36 | IdeTransfer_StartWithCommandInAL: |
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[157] | 37 | ; Are we reading or writing? |
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[171] | 38 | 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] | 39 | mov ah, [bp+IDEPACK.bSectorCount] |
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| 40 | jnz SHORT WriteToDrive |
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[171] | 41 | cmp al, COMMAND_WRITE_MULTIPLE |
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[242] | 42 | je SHORT WriteToDrive |
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| 43 | ; Fall to ReadFromDrive |
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[150] | 44 | |
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| 45 | ;-------------------------------------------------------------------- |
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[242] | 46 | ; ReadFromDrive |
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[150] | 47 | ; Parameters: |
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[242] | 48 | ; AH: Number of sectors to transfer (1...128) |
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| 49 | ; ES:SI: Normalized ptr to buffer to receive data |
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[150] | 50 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 51 | ; SS:BP: Ptr to PIOVARS |
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| 52 | ; Returns: |
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[242] | 53 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[150] | 54 | ; AH: BIOS Error code |
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[218] | 55 | ; CX: Number of successfully transferred sectors |
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[150] | 56 | ; CF: 0 if transfer succesfull |
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| 57 | ; 1 if any error |
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| 58 | ; Corrupts registers: |
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[218] | 59 | ; AL, BX, DX, SI, ES |
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[150] | 60 | ;-------------------------------------------------------------------- |
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[242] | 61 | ReadFromDrive: |
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| 62 | ; Prepare to read data to ESSI |
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| 63 | mov bx, g_rgfnPioRead |
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| 64 | call InitializePiovarsInSSBPwithSectorCountInAH |
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| 65 | |
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| 66 | ; Wait until drive is ready to transfer |
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| 67 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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[218] | 68 | jc SHORT ReturnWithTransferErrorInAH |
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[242] | 69 | xchg si, di ; ES:DI now points buffer |
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[218] | 70 | |
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[242] | 71 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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| 72 | |
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[150] | 73 | ALIGN JUMP_ALIGN |
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[242] | 74 | .ReadNextBlockFromDrive: |
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[150] | 75 | mov dx, [bp+PIOVARS.wDataPort] |
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[218] | 76 | cmp [bp+PIOVARS.wWordsLeft], cx |
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[242] | 77 | jbe SHORT .ReadLastBlockFromDrive |
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[218] | 78 | call [bp+PIOVARS.fnXfer] |
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[169] | 79 | |
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[218] | 80 | ; Wait until ready for next block and check for errors |
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[242] | 81 | xchg di, si ; DS:DI now points DPT |
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[218] | 82 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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| 83 | jc SHORT ReturnWithTransferErrorInAH |
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[242] | 84 | xchg si, di ; ES:DI now points buffer |
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[169] | 85 | |
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[242] | 86 | ; Increment number of successfully read WORDs |
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| 87 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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| 88 | sub [bp+PIOVARS.wWordsLeft], cx |
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| 89 | add [bp+PIOVARS.wWordsDone], cx |
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| 90 | jmp SHORT .ReadNextBlockFromDrive |
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[150] | 91 | |
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| 92 | ALIGN JUMP_ALIGN |
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[242] | 93 | .ReadLastBlockFromDrive: |
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[218] | 94 | mov cx, [bp+PIOVARS.wWordsLeft] |
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[150] | 95 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 96 | |
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[242] | 97 | ; Check for errors in last block |
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| 98 | mov di, si ; DS:DI now points DPT |
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| 99 | CheckErrorsAfterTransferringLastBlock: |
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| 100 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 101 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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[150] | 102 | |
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[242] | 103 | ; Return number of successfully read sectors |
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| 104 | ReturnWithTransferErrorInAH: |
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| 105 | mov cx, [bp+PIOVARS.wWordsDone] |
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| 106 | jc SHORT .ConvertTransferredWordsInCXtoSectors |
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| 107 | add cx, [bp+PIOVARS.wWordsLeft] ; Never sets CF |
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| 108 | .ConvertTransferredWordsInCXtoSectors: |
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| 109 | xchg cl, ch |
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| 110 | ret |
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| 111 | |
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| 112 | |
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[150] | 113 | ;-------------------------------------------------------------------- |
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[242] | 114 | ; WriteToDrive |
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[150] | 115 | ; Parameters: |
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[242] | 116 | ; AH: Number of sectors to transfer (1...128) |
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| 117 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 118 | ; ES:SI: Normalized ptr to buffer containing data |
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[150] | 119 | ; SS:BP: Ptr to PIOVARS |
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| 120 | ; Returns: |
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| 121 | ; AH: BIOS Error code |
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[218] | 122 | ; CX: Number of successfully transferred sectors |
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[150] | 123 | ; CF: 0 if transfer succesfull |
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| 124 | ; 1 if any error |
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| 125 | ; Corrupts registers: |
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[218] | 126 | ; AL, BX, DX, SI, ES |
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[150] | 127 | ;-------------------------------------------------------------------- |
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| 128 | ALIGN JUMP_ALIGN |
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[242] | 129 | WriteToDrive: |
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| 130 | ; Prepare to write data from ESSI |
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| 131 | mov bx, g_rgfnPioWrite |
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| 132 | call InitializePiovarsInSSBPwithSectorCountInAH |
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| 133 | |
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| 134 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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| 135 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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| 136 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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[218] | 137 | jc SHORT ReturnWithTransferErrorInAH |
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[150] | 138 | |
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[242] | 139 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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| 140 | |
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[218] | 141 | ALIGN JUMP_ALIGN |
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[242] | 142 | .WriteNextBlockToDrive: |
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[150] | 143 | mov dx, [bp+PIOVARS.wDataPort] |
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[218] | 144 | cmp [bp+PIOVARS.wWordsLeft], cx |
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[242] | 145 | jbe SHORT .WriteLastBlockToDrive |
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[218] | 146 | call [bp+PIOVARS.fnXfer] |
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[169] | 147 | |
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[218] | 148 | ; Wait until ready for next block and check for errors |
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| 149 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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| 150 | jc SHORT ReturnWithTransferErrorInAH |
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[150] | 151 | |
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[242] | 152 | ; Increment number of successfully written WORDs |
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| 153 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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| 154 | sub [bp+PIOVARS.wWordsLeft], cx |
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| 155 | add [bp+PIOVARS.wWordsDone], cx |
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| 156 | jmp SHORT .WriteNextBlockToDrive |
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[169] | 157 | |
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[150] | 158 | ALIGN JUMP_ALIGN |
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[242] | 159 | .WriteLastBlockToDrive: |
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[218] | 160 | mov cx, [bp+PIOVARS.wWordsLeft] |
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[242] | 161 | %ifdef USE_186 |
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| 162 | push CheckErrorsAfterTransferringLastBlock |
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| 163 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 164 | %else |
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[150] | 165 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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[242] | 166 | jmp SHORT CheckErrorsAfterTransferringLastBlock |
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| 167 | %endif |
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[218] | 168 | |
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[150] | 169 | |
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| 170 | ;-------------------------------------------------------------------- |
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[218] | 171 | ; InitializePiovarsInSSBPwithSectorCountInAH |
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[150] | 172 | ; Parameters: |
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[218] | 173 | ; AH: Number of sectors to transfer (1...128) |
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[150] | 174 | ; BX: Offset to transfer function lookup table |
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| 175 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[169] | 176 | ; SS:BP: Ptr to PIOVARS |
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[167] | 177 | ; Returns: |
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[169] | 178 | ; Nothing |
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[150] | 179 | ; Corrupts registers: |
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[242] | 180 | ; AX, BX, DX |
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[150] | 181 | ;-------------------------------------------------------------------- |
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| 182 | ALIGN JUMP_ALIGN |
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[218] | 183 | InitializePiovarsInSSBPwithSectorCountInAH: |
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| 184 | ; Store sizes |
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| 185 | xor al, al |
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| 186 | mov [bp+PIOVARS.wWordsLeft], ax |
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[242] | 187 | mov ah, [di+DPT_ATA.bSetBlock] |
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| 188 | mov [bp+PIOVARS.wWordsInBlock], ax |
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[218] | 189 | cbw |
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| 190 | mov [bp+PIOVARS.wWordsDone], ax ; Zero |
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[150] | 191 | |
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| 192 | ; Get transfer function based on bus type |
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[158] | 193 | xchg ax, bx ; Lookup table offset to AX |
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[242] | 194 | mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS |
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[150] | 195 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address |
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| 196 | mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX |
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| 197 | add bx, ax |
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[242] | 198 | mov [bp+PIOVARS.wDataPort], dx |
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[150] | 199 | mov ax, [cs:bx] ; Load offset to transfer function |
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| 200 | mov [bp+PIOVARS.fnXfer], ax |
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| 201 | ret |
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| 202 | |
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| 203 | |
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| 204 | ;-------------------------------------------------------------------- |
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[152] | 205 | ; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer |
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| 206 | ; SingleByteRead Single port 8-bit PIO read transfer |
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| 207 | ; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 208 | ; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer |
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| 209 | ; DWordRead VLB/PCI 32-bit IDE PIO read transfer |
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[150] | 210 | ; Parameters: |
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| 211 | ; CX: Block size in WORDs |
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| 212 | ; DX: IDE Data port address |
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[242] | 213 | ; ES:DI: Normalized ptr to buffer to receive data |
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[150] | 214 | ; Returns: |
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| 215 | ; Nothing |
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| 216 | ; Corrupts registers: |
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| 217 | ; AX, BX, CX |
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| 218 | ;-------------------------------------------------------------------- |
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| 219 | ALIGN JUMP_ALIGN |
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[152] | 220 | DualByteReadForXtide: |
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[181] | 221 | eSHR_IM cx, 2 ; Loop unrolling |
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[152] | 222 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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[150] | 223 | ALIGN JUMP_ALIGN |
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| 224 | .InswLoop: |
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[152] | 225 | XTIDE_INSW |
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| 226 | XTIDE_INSW |
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| 227 | XTIDE_INSW |
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| 228 | XTIDE_INSW |
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[150] | 229 | loop .InswLoop |
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| 230 | ret |
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| 231 | |
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[152] | 232 | ;---- |
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[150] | 233 | ALIGN JUMP_ALIGN |
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| 234 | SingleByteRead: |
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| 235 | %ifdef USE_186 ; INS instruction available |
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[242] | 236 | dec cx ; Avoid overflowing CX on a 128 sector transfer |
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[152] | 237 | shl cx, 1 ; WORD count to BYTE count |
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[242] | 238 | inc cx |
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[150] | 239 | rep insb |
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[242] | 240 | insb |
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[150] | 241 | %else ; If 8088/8086 |
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[152] | 242 | shr cx, 1 ; WORD count to DWORD count |
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[150] | 243 | ALIGN JUMP_ALIGN |
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| 244 | .InsdLoop: |
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| 245 | in al, dx |
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[152] | 246 | stosb ; Store to [ES:DI] |
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[150] | 247 | in al, dx |
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| 248 | stosb |
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| 249 | in al, dx |
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| 250 | stosb |
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| 251 | in al, dx |
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| 252 | stosb |
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| 253 | loop .InsdLoop |
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| 254 | %endif |
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| 255 | ret |
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| 256 | |
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[152] | 257 | ;---- |
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| 258 | %ifndef USE_186 |
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| 259 | ALIGN JUMP_ALIGN |
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| 260 | WordReadForXTIDEmod: |
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| 261 | times 2 shr cx, 1 ; WORD count to QWORD count |
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| 262 | ALIGN JUMP_ALIGN |
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| 263 | .ReadNextQword: |
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| 264 | in ax, dx ; Read 1st WORD |
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| 265 | stosw ; Store 1st WORD to [ES:DI] |
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| 266 | in ax, dx |
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| 267 | stosw ; 2nd |
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| 268 | in ax, dx |
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| 269 | stosw ; 3rd |
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| 270 | in ax, dx |
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| 271 | stosw ; 4th |
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| 272 | loop .ReadNextQword |
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| 273 | ret |
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| 274 | %endif |
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[150] | 275 | |
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[152] | 276 | ;---- |
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| 277 | ALIGN JUMP_ALIGN |
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| 278 | WordReadForXTplusAndAT: |
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| 279 | rep |
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| 280 | db 6Dh ; INSW (we want this in XT build) |
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| 281 | ret |
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| 282 | |
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| 283 | ;---- |
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| 284 | ALIGN JUMP_ALIGN |
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| 285 | DWordRead: |
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| 286 | shr cx, 1 ; WORD count to DWORD count |
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| 287 | rep |
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| 288 | db 66h ; Override operand size to 32-bit |
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| 289 | db 6Dh ; INSW/INSD |
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| 290 | ret |
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| 291 | |
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| 292 | |
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[150] | 293 | ;-------------------------------------------------------------------- |
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[152] | 294 | ; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer |
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| 295 | ; SingleByteWrite Single port 8-bit PIO write transfer |
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| 296 | ; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 297 | ; WordWrite Normal 16-bit IDE PIO write transfer |
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| 298 | ; DWordWrite VLB/PCI 32-bit IDE PIO write transfer |
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[150] | 299 | ; Parameters: |
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| 300 | ; CX: Block size in WORDs |
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| 301 | ; DX: IDE Data port address |
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| 302 | ; ES:SI: Normalized ptr to buffer containing data |
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| 303 | ; Returns: |
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| 304 | ; Nothing |
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| 305 | ; Corrupts registers: |
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| 306 | ; AX, CX |
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| 307 | ;-------------------------------------------------------------------- |
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| 308 | ALIGN JUMP_ALIGN |
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[152] | 309 | DualByteWriteForXtide: |
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[150] | 310 | push ds |
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| 311 | push bx |
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[181] | 312 | eSHR_IM cx, 2 ; Loop unrolling |
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[152] | 313 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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| 314 | push es ; Copy ES... |
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| 315 | pop ds ; ...to DS |
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[150] | 316 | ALIGN JUMP_ALIGN |
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| 317 | .OutswLoop: |
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[152] | 318 | XTIDE_OUTSW |
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| 319 | XTIDE_OUTSW |
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| 320 | XTIDE_OUTSW |
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| 321 | XTIDE_OUTSW |
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[150] | 322 | loop .OutswLoop |
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| 323 | pop bx |
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| 324 | pop ds |
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| 325 | ret |
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| 326 | |
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[152] | 327 | ;---- |
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[150] | 328 | ALIGN JUMP_ALIGN |
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| 329 | SingleByteWrite: |
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| 330 | %ifdef USE_186 ; OUTS instruction available |
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[242] | 331 | dec cx ; Avoid overflowing CX on a 128 sector transfer |
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[152] | 332 | shl cx, 1 ; WORD count to BYTE count |
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[242] | 333 | inc cx |
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[223] | 334 | es ; Source is ES segment |
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[150] | 335 | rep outsb |
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[242] | 336 | es outsb |
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[150] | 337 | %else ; If 8088/8086 |
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[152] | 338 | shr cx, 1 ; WORD count to DWORD count |
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| 339 | push ds ; Store DS |
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| 340 | push es ; Copy ES... |
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| 341 | pop ds ; ...to DS |
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[150] | 342 | ALIGN JUMP_ALIGN |
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| 343 | .OutsdLoop: |
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[152] | 344 | lodsb ; Load from [DS:SI] to AL |
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[150] | 345 | out dx, al |
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| 346 | lodsb |
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| 347 | out dx, al |
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| 348 | lodsb |
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| 349 | out dx, al |
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| 350 | lodsb |
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| 351 | out dx, al |
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| 352 | loop .OutsdLoop |
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[152] | 353 | pop ds ; Restore DS |
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[150] | 354 | %endif |
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| 355 | ret |
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| 356 | |
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[152] | 357 | ;--- |
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| 358 | ALIGN JUMP_ALIGN |
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| 359 | WordWriteForXTIDEmod: |
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| 360 | push ds |
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[181] | 361 | eSHR_IM cx, 2 ; Loop unrolling |
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[152] | 362 | push es ; Copy ES... |
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| 363 | pop ds ; ...to DS |
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| 364 | ALIGN JUMP_ALIGN |
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| 365 | .WriteNextQword: |
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| 366 | XTIDE_MOD_OUTSW |
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| 367 | XTIDE_MOD_OUTSW |
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| 368 | XTIDE_MOD_OUTSW |
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| 369 | XTIDE_MOD_OUTSW |
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| 370 | loop .WriteNextQword |
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| 371 | pop ds |
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| 372 | ret |
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[150] | 373 | |
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[152] | 374 | ;---- |
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| 375 | ALIGN JUMP_ALIGN |
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| 376 | WordWrite: |
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[223] | 377 | es ; Source is ES segment |
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[152] | 378 | rep |
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[155] | 379 | db 6Fh ; OUTSW (we want this in XT build) |
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[152] | 380 | ret |
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| 381 | |
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| 382 | ALIGN JUMP_ALIGN |
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| 383 | DWordWrite: |
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| 384 | shr cx, 1 ; WORD count to DWORD count |
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[223] | 385 | es ; Source is ES segment |
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[152] | 386 | rep |
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| 387 | db 66h ; Override operand size to 32-bit |
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| 388 | db 6Fh ; OUTSW/OUTSD |
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| 389 | ret |
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| 390 | |
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| 391 | |
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[150] | 392 | ; Lookup tables to get transfer function based on bus type |
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| 393 | ALIGN WORD_ALIGN |
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| 394 | g_rgfnPioRead: |
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[152] | 395 | dw DualByteReadForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE |
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| 396 | %ifdef USE_186 |
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| 397 | dw WordReadForXTplusAndAT ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0 |
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| 398 | %else |
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| 399 | dw WordReadForXTIDEmod |
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| 400 | %endif |
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| 401 | dw SingleByteRead ; DEVICE_8BIT_SINGLE_PORT |
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| 402 | dw WordReadForXTplusAndAT ; DEVICE_16BIT_ATA |
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| 403 | dw DWordRead ; DEVICE_32BIT_ATA |
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| 404 | |
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[150] | 405 | g_rgfnPioWrite: |
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[152] | 406 | dw DualByteWriteForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE |
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| 407 | dw WordWriteForXTIDEmod ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0 |
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| 408 | dw SingleByteWrite ; DEVICE_8BIT_SINGLE_PORT |
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| 409 | dw WordWrite ; DEVICE_16BIT_ATA |
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| 410 | dw DWordWrite ; DEVICE_32BIT_ATA |
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