[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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[167] | 7 | .wBlockLeftAndSectorsInLastBlock: |
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| 8 | .bBlocksLeft resb 1 |
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| 9 | .bSectorsInLastBlock: resb 1 |
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[150] | 10 | .wBlockSize resb 2 ; Block size in WORDs (256...32768) |
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| 11 | .wDataPort resb 2 |
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[167] | 12 | resb 1 |
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[150] | 13 | resb 1 ; Offset 7 = IDEPACK.bDeviceControl |
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| 14 | .fnXfer resb 2 ; Offset to transfer function |
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| 15 | endstruc |
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| 16 | |
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| 17 | |
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| 18 | ; Section containing code |
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| 19 | SECTION .text |
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| 20 | |
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| 21 | ;-------------------------------------------------------------------- |
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| 22 | ; IdeTransfer_StartWithCommandInAL |
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| 23 | ; Parameters: |
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| 24 | ; AL: IDE command that was used to start the transfer |
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| 25 | ; ES:SI: Ptr to destination buffer or source data |
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| 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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| 30 | ; CF: Cleared if success, Set if error |
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| 31 | ; Corrupts registers: |
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| 32 | ; AL, BX, CX, DX, SI, ES |
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| 33 | ;-------------------------------------------------------------------- |
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| 34 | ALIGN JUMP_ALIGN |
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| 35 | IdeTransfer_StartWithCommandInAL: |
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[157] | 36 | ; Are we reading or writing? |
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| 37 | 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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| 38 | jnz SHORT .PrepareToWriteDataFromESSI |
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[150] | 39 | cmp al, COMMAND_WRITE_MULTIPLE |
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| 40 | je SHORT .PrepareToWriteDataFromESSI |
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| 41 | |
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| 42 | ; Prepare to read data to ESSI |
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| 43 | mov bx, g_rgfnPioRead |
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[167] | 44 | call InitializePiovarsToSSBPfromIdepackInSSBP |
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[150] | 45 | xchg si, di |
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[167] | 46 | %ifdef USE_186 |
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| 47 | push ReadFromDriveToESDI |
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| 48 | jmp Registers_NormalizeESDI |
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| 49 | %else |
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[150] | 50 | call Registers_NormalizeESDI |
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[167] | 51 | jmp SHORT ReadFromDriveToESDI |
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| 52 | %endif |
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[150] | 53 | |
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| 54 | ALIGN JUMP_ALIGN |
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| 55 | .PrepareToWriteDataFromESSI: |
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| 56 | mov bx, g_rgfnPioWrite |
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[167] | 57 | call InitializePiovarsToSSBPfromIdepackInSSBP |
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[150] | 58 | call Registers_NormalizeESSI |
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[167] | 59 | ; Fall to WriteToDriveFromESSI |
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[150] | 60 | |
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| 61 | |
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| 62 | ;-------------------------------------------------------------------- |
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[167] | 63 | ; WriteToDriveFromESSI |
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[150] | 64 | ; Parameters: |
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| 65 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 66 | ; ES:SI: Normalized ptr to buffer containing data |
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| 67 | ; SS:BP: Ptr to PIOVARS |
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| 68 | ; Returns: |
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| 69 | ; AH: BIOS Error code |
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| 70 | ; CF: 0 if transfer succesfull |
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| 71 | ; 1 if any error |
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| 72 | ; Corrupts registers: |
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| 73 | ; AL, BX, CX, DX, SI, ES |
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| 74 | ;-------------------------------------------------------------------- |
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[167] | 75 | WriteToDriveFromESSI: |
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[150] | 76 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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| 77 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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| 78 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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| 79 | jc SHORT .ReturnWithTransferErrorInAH |
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| 80 | ALIGN JUMP_ALIGN |
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| 81 | .WriteNextBlock: |
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| 82 | mov dx, [bp+PIOVARS.wDataPort] |
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[167] | 83 | dec BYTE [bp+PIOVARS.bBlocksLeft] ; Transferring last (possibly partial) block? |
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[150] | 84 | jz SHORT .XferLastBlock ; If so, jump to transfer |
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| 85 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size in WORDs |
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| 86 | call [bp+PIOVARS.fnXfer] ; Transfer full block |
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| 87 | %ifdef USE_186 |
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| 88 | push .WriteNextBlock |
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| 89 | jmp IdeWait_IRQorDRQ |
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| 90 | %else |
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| 91 | call IdeWait_IRQorDRQ |
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| 92 | jnc SHORT .WriteNextBlock |
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| 93 | %endif |
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| 94 | .ReturnWithTransferErrorInAH: |
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| 95 | ret |
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| 96 | |
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| 97 | ALIGN JUMP_ALIGN |
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| 98 | .XferLastBlock: |
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| 99 | xor cx, cx |
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| 100 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 101 | mov ch, [bp+PIOVARS.bSectorsInLastBlock]; CX = Partial block size in WORDs |
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| 102 | %ifdef USE_186 |
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| 103 | push IdeWait_IRQorStatusFlagInBLwithTimeoutInBH |
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| 104 | jmp [bp+PIOVARS.fnXfer] |
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| 105 | %else |
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| 106 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 107 | jmp IdeWait_IRQorStatusFlagInBLwithTimeoutInBH ; Check for errors |
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| 108 | %endif |
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| 109 | |
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| 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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[167] | 112 | ; ReadFromDriveToESDI |
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[150] | 113 | ; Parameters: |
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| 114 | ; ES:DI: Normalized ptr to buffer to recieve data |
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| 115 | ; DS:SI: Ptr to DPT (in RAMVARS segment) |
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| 116 | ; SS:BP: Ptr to PIOVARS |
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| 117 | ; Returns: |
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| 118 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 119 | ; AH: BIOS Error code |
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| 120 | ; CF: 0 if transfer succesfull |
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| 121 | ; 1 if any error |
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| 122 | ; Corrupts registers: |
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| 123 | ; AL, BX, CX, DX, SI, ES |
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| 124 | ;-------------------------------------------------------------------- |
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| 125 | ALIGN JUMP_ALIGN |
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[167] | 126 | ReadFromDriveToESDI: |
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[150] | 127 | ; Wait until drive is ready to transfer |
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| 128 | xchg di, si ; DS:DI now points DPT |
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| 129 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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[167] | 130 | jc SHORT WriteToDriveFromESSI.ReturnWithTransferErrorInAH |
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[150] | 131 | xchg si, di ; ES:DI now points buffer |
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| 132 | |
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| 133 | ; Transfer full or last (possible partial) block |
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| 134 | mov dx, [bp+PIOVARS.wDataPort] |
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[167] | 135 | dec BYTE [bp+PIOVARS.bBlocksLeft] |
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[150] | 136 | jz SHORT .XferLastBlock |
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| 137 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size in WORDs |
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[167] | 138 | %ifdef USE_186 |
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| 139 | push ReadFromDriveToESDI |
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| 140 | jmp [bp+PIOVARS.fnXfer] |
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| 141 | %else |
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[150] | 142 | call [bp+PIOVARS.fnXfer] ; Transfer full block |
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[167] | 143 | jmp SHORT ReadFromDriveToESDI ; Loop while blocks left |
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| 144 | %endif |
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[150] | 145 | |
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| 146 | ALIGN JUMP_ALIGN |
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| 147 | .XferLastBlock: |
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| 148 | xor cx, cx |
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| 149 | mov ch, [bp+PIOVARS.bSectorsInLastBlock]; CX = Partial block size in WORDs |
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| 150 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 151 | mov di, si ; DS:DI now points DPT |
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| 152 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 153 | jmp IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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| 154 | |
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| 155 | |
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| 156 | ;-------------------------------------------------------------------- |
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[167] | 157 | ; InitializePiovarsToSSBPfromIdepackInSSBP |
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[150] | 158 | ; Parameters: |
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| 159 | ; BX: Offset to transfer function lookup table |
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| 160 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[167] | 161 | ; SS:BP: Ptr to IDEPACK |
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| 162 | ; Returns: |
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[150] | 163 | ; SS:BP: Ptr to PIOVARS |
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| 164 | ; Corrupts registers: |
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| 165 | ; AX, BX, CX, DX |
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| 166 | ;-------------------------------------------------------------------- |
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| 167 | ALIGN JUMP_ALIGN |
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[167] | 168 | InitializePiovarsToSSBPfromIdepackInSSBP: |
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[150] | 169 | ; Store number of blocks to transfer |
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[167] | 170 | eMOVZX cx, BYTE [di+DPT_ATA.bSetBlock] ; Block size in sectors, zero CH |
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| 171 | eMOVZX ax, BYTE [bp+IDEPACK.bSectorCount] ; AX = sectors to transfer (1...128) |
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| 172 | div cl ; AL = Full blocks to transfer |
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| 173 | test ah, ah ; AH = Sectors in partial block |
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[150] | 174 | jz SHORT .NoPartialBlocksToTransfer |
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[167] | 175 | inc ax ; Add partial block to total block count |
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| 176 | SKIP2B dx ; Skip mov ah, cl |
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[150] | 177 | .NoPartialBlocksToTransfer: |
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[167] | 178 | mov ah, cl ; Full block size if no partial blocks to transfer |
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| 179 | mov [bp+PIOVARS.wBlockLeftAndSectorsInLastBlock], ax |
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[150] | 180 | |
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| 181 | ; Store block size in WORDs |
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| 182 | xchg ch, cl ; CX = Block size in WORDs |
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| 183 | mov [bp+PIOVARS.wBlockSize], cx |
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| 184 | |
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| 185 | ; Get transfer function based on bus type |
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[158] | 186 | xchg ax, bx ; Lookup table offset to AX |
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[150] | 187 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS |
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| 188 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address |
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| 189 | mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX |
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| 190 | add bx, ax |
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| 191 | mov ax, [cs:bx] ; Load offset to transfer function |
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| 192 | mov [bp+PIOVARS.wDataPort], dx |
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| 193 | mov [bp+PIOVARS.fnXfer], ax |
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| 194 | ret |
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| 195 | |
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| 196 | |
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| 197 | ;-------------------------------------------------------------------- |
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[152] | 198 | ; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer |
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| 199 | ; SingleByteRead Single port 8-bit PIO read transfer |
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| 200 | ; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 201 | ; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer |
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| 202 | ; DWordRead VLB/PCI 32-bit IDE PIO read transfer |
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[150] | 203 | ; Parameters: |
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| 204 | ; CX: Block size in WORDs |
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| 205 | ; DX: IDE Data port address |
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| 206 | ; ES:DI: Normalized ptr to buffer to recieve data |
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| 207 | ; Returns: |
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| 208 | ; Nothing |
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| 209 | ; Corrupts registers: |
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| 210 | ; AX, BX, CX |
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| 211 | ;-------------------------------------------------------------------- |
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| 212 | ALIGN JUMP_ALIGN |
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[152] | 213 | DualByteReadForXtide: |
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[161] | 214 | %ifdef USE_186 |
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| 215 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 216 | %else |
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[152] | 217 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 218 | %endif |
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[152] | 219 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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[150] | 220 | ALIGN JUMP_ALIGN |
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| 221 | .InswLoop: |
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[152] | 222 | XTIDE_INSW |
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| 223 | XTIDE_INSW |
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| 224 | XTIDE_INSW |
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| 225 | XTIDE_INSW |
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[150] | 226 | loop .InswLoop |
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| 227 | ret |
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| 228 | |
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[152] | 229 | ;---- |
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[150] | 230 | ALIGN JUMP_ALIGN |
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| 231 | SingleByteRead: |
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| 232 | %ifdef USE_186 ; INS instruction available |
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[152] | 233 | shl cx, 1 ; WORD count to BYTE count |
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[150] | 234 | rep insb |
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| 235 | %else ; If 8088/8086 |
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[152] | 236 | shr cx, 1 ; WORD count to DWORD count |
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[150] | 237 | ALIGN JUMP_ALIGN |
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| 238 | .InsdLoop: |
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| 239 | in al, dx |
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[152] | 240 | stosb ; Store to [ES:DI] |
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[150] | 241 | in al, dx |
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| 242 | stosb |
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| 243 | in al, dx |
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| 244 | stosb |
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| 245 | in al, dx |
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| 246 | stosb |
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| 247 | loop .InsdLoop |
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| 248 | %endif |
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| 249 | ret |
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| 250 | |
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[152] | 251 | ;---- |
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| 252 | %ifndef USE_186 |
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| 253 | ALIGN JUMP_ALIGN |
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| 254 | WordReadForXTIDEmod: |
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| 255 | times 2 shr cx, 1 ; WORD count to QWORD count |
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| 256 | ALIGN JUMP_ALIGN |
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| 257 | .ReadNextQword: |
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| 258 | in ax, dx ; Read 1st WORD |
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| 259 | stosw ; Store 1st WORD to [ES:DI] |
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| 260 | in ax, dx |
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| 261 | stosw ; 2nd |
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| 262 | in ax, dx |
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| 263 | stosw ; 3rd |
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| 264 | in ax, dx |
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| 265 | stosw ; 4th |
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| 266 | loop .ReadNextQword |
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| 267 | ret |
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| 268 | %endif |
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[150] | 269 | |
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[152] | 270 | ;---- |
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| 271 | ALIGN JUMP_ALIGN |
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| 272 | WordReadForXTplusAndAT: |
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| 273 | rep |
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| 274 | db 6Dh ; INSW (we want this in XT build) |
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| 275 | ret |
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| 276 | |
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| 277 | ;---- |
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| 278 | ALIGN JUMP_ALIGN |
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| 279 | DWordRead: |
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| 280 | shr cx, 1 ; WORD count to DWORD count |
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| 281 | rep |
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| 282 | db 66h ; Override operand size to 32-bit |
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| 283 | db 6Dh ; INSW/INSD |
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| 284 | ret |
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| 285 | |
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| 286 | |
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[150] | 287 | ;-------------------------------------------------------------------- |
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[152] | 288 | ; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer |
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| 289 | ; SingleByteWrite Single port 8-bit PIO write transfer |
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| 290 | ; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 291 | ; WordWrite Normal 16-bit IDE PIO write transfer |
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| 292 | ; DWordWrite VLB/PCI 32-bit IDE PIO write transfer |
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[150] | 293 | ; Parameters: |
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| 294 | ; CX: Block size in WORDs |
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| 295 | ; DX: IDE Data port address |
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| 296 | ; ES:SI: Normalized ptr to buffer containing data |
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| 297 | ; Returns: |
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| 298 | ; Nothing |
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| 299 | ; Corrupts registers: |
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| 300 | ; AX, CX |
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| 301 | ;-------------------------------------------------------------------- |
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| 302 | ALIGN JUMP_ALIGN |
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[152] | 303 | DualByteWriteForXtide: |
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[150] | 304 | push ds |
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| 305 | push bx |
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[161] | 306 | %ifdef USE_186 |
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| 307 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 308 | %else |
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[152] | 309 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 310 | %endif |
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[152] | 311 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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| 312 | push es ; Copy ES... |
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| 313 | pop ds ; ...to DS |
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[150] | 314 | ALIGN JUMP_ALIGN |
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| 315 | .OutswLoop: |
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[152] | 316 | XTIDE_OUTSW |
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| 317 | XTIDE_OUTSW |
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| 318 | XTIDE_OUTSW |
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| 319 | XTIDE_OUTSW |
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[150] | 320 | loop .OutswLoop |
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| 321 | pop bx |
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| 322 | pop ds |
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| 323 | ret |
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| 324 | |
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[152] | 325 | ;---- |
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[150] | 326 | ALIGN JUMP_ALIGN |
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| 327 | SingleByteWrite: |
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| 328 | %ifdef USE_186 ; OUTS instruction available |
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[152] | 329 | shl cx, 1 ; WORD count to BYTE count |
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| 330 | eSEG es ; Source is ES segment |
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[150] | 331 | rep outsb |
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| 332 | %else ; If 8088/8086 |
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[152] | 333 | shr cx, 1 ; WORD count to DWORD count |
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| 334 | push ds ; Store DS |
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| 335 | push es ; Copy ES... |
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| 336 | pop ds ; ...to DS |
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[150] | 337 | ALIGN JUMP_ALIGN |
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| 338 | .OutsdLoop: |
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[152] | 339 | lodsb ; Load from [DS:SI] to AL |
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[150] | 340 | out dx, al |
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| 341 | lodsb |
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| 342 | out dx, al |
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| 343 | lodsb |
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| 344 | out dx, al |
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| 345 | lodsb |
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| 346 | out dx, al |
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| 347 | loop .OutsdLoop |
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[152] | 348 | pop ds ; Restore DS |
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[150] | 349 | %endif |
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| 350 | ret |
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| 351 | |
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[152] | 352 | ;--- |
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| 353 | ALIGN JUMP_ALIGN |
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| 354 | WordWriteForXTIDEmod: |
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| 355 | push ds |
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[161] | 356 | %ifdef USE_186 |
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| 357 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 358 | %else |
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[152] | 359 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 360 | %endif |
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[152] | 361 | push es ; Copy ES... |
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| 362 | pop ds ; ...to DS |
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| 363 | ALIGN JUMP_ALIGN |
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| 364 | .WriteNextQword: |
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| 365 | XTIDE_MOD_OUTSW |
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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 | loop .WriteNextQword |
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| 370 | pop ds |
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| 371 | ret |
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[150] | 372 | |
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[152] | 373 | ;---- |
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| 374 | ALIGN JUMP_ALIGN |
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| 375 | WordWrite: |
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| 376 | eSEG es ; Source is ES segment |
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| 377 | rep |
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[155] | 378 | db 6Fh ; OUTSW (we want this in XT build) |
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[152] | 379 | ret |
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| 380 | |
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| 381 | ALIGN JUMP_ALIGN |
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| 382 | DWordWrite: |
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| 383 | shr cx, 1 ; WORD count to DWORD count |
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| 384 | eSEG es ; Source is ES segment |
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| 385 | rep |
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| 386 | db 66h ; Override operand size to 32-bit |
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| 387 | db 6Fh ; OUTSW/OUTSD |
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| 388 | ret |
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| 389 | |
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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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