[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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[169] | 7 | .wBlocksLeft resb 2 |
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[150] | 8 | .wBlockSize resb 2 ; Block size in WORDs (256...32768) |
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| 9 | .wDataPort resb 2 |
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[169] | 10 | .bSectorsInLastBlock: resb 1 |
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[150] | 11 | resb 1 ; Offset 7 = IDEPACK.bDeviceControl |
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| 12 | .fnXfer resb 2 ; Offset to transfer function |
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| 13 | endstruc |
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| 14 | |
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| 15 | |
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| 16 | ; Section containing code |
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| 17 | SECTION .text |
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| 18 | |
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| 19 | ;-------------------------------------------------------------------- |
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| 20 | ; IdeTransfer_StartWithCommandInAL |
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| 21 | ; Parameters: |
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| 22 | ; AL: IDE command that was used to start the transfer |
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| 23 | ; ES:SI: Ptr to destination buffer or source data |
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| 24 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 25 | ; SS:BP: Ptr to IDEPACK |
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| 26 | ; Returns: |
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| 27 | ; AH: INT 13h Error Code |
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| 28 | ; CF: Cleared if success, Set if error |
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| 29 | ; Corrupts registers: |
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| 30 | ; AL, BX, CX, DX, SI, ES |
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| 31 | ;-------------------------------------------------------------------- |
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| 32 | ALIGN JUMP_ALIGN |
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| 33 | IdeTransfer_StartWithCommandInAL: |
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[169] | 34 | mov ah, [bp+IDEPACK.bSectorCountHighExt] |
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| 35 | |
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[157] | 36 | ; Are we reading or writing? |
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[170] | 37 | test al, 11001b |
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| 38 | jpo SHORT .PrepareToWriteDataFromESSI |
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[150] | 39 | |
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| 40 | ; Prepare to read data to ESSI |
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| 41 | mov bx, g_rgfnPioRead |
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[169] | 42 | mov al, [bp+IDEPACK.bSectorCount] |
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| 43 | call InitializePiovarsInSSBPwithSectorCountInAX |
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[150] | 44 | xchg si, di |
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| 45 | call Registers_NormalizeESDI |
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[169] | 46 | jmp SHORT ReadFromDrive |
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[150] | 47 | |
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| 48 | ALIGN JUMP_ALIGN |
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| 49 | .PrepareToWriteDataFromESSI: |
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| 50 | mov bx, g_rgfnPioWrite |
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[169] | 51 | mov al, [bp+IDEPACK.bSectorCount] |
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| 52 | call InitializePiovarsInSSBPwithSectorCountInAX |
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[150] | 53 | call Registers_NormalizeESSI |
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[169] | 54 | ; Fall to WriteToDrive |
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[150] | 55 | |
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| 56 | |
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| 57 | ;-------------------------------------------------------------------- |
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[169] | 58 | ; WriteToDrive |
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[150] | 59 | ; Parameters: |
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| 60 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 61 | ; ES:SI: Normalized ptr to buffer containing data |
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| 62 | ; SS:BP: Ptr to PIOVARS |
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| 63 | ; Returns: |
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| 64 | ; AH: BIOS Error code |
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| 65 | ; CF: 0 if transfer succesfull |
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| 66 | ; 1 if any error |
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| 67 | ; Corrupts registers: |
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| 68 | ; AL, BX, CX, DX, SI, ES |
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| 69 | ;-------------------------------------------------------------------- |
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[169] | 70 | WriteToDrive: |
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[150] | 71 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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| 72 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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| 73 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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| 74 | jc SHORT .ReturnWithTransferErrorInAH |
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| 75 | ALIGN JUMP_ALIGN |
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| 76 | .WriteNextBlock: |
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| 77 | mov dx, [bp+PIOVARS.wDataPort] |
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[169] | 78 | dec WORD [bp+PIOVARS.wBlocksLeft] ; Transferring last (possibly partial) block? |
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[150] | 79 | jz SHORT .XferLastBlock ; If so, jump to transfer |
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| 80 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size in WORDs |
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| 81 | call [bp+PIOVARS.fnXfer] ; Transfer full block |
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[169] | 82 | |
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| 83 | ; Normalize pointer when necessary |
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| 84 | mov ax, si |
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| 85 | shr ax, 1 ; WORD offset |
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| 86 | add ax, [bp+PIOVARS.wBlockSize] |
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| 87 | jns SHORT .WaitUntilReadyToTransferNextBlock |
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| 88 | call Registers_NormalizeESSI |
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| 89 | |
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| 90 | ALIGN JUMP_ALIGN |
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| 91 | .WaitUntilReadyToTransferNextBlock: |
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[150] | 92 | %ifdef USE_186 |
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| 93 | push .WriteNextBlock |
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| 94 | jmp IdeWait_IRQorDRQ |
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| 95 | %else |
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| 96 | call IdeWait_IRQorDRQ |
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| 97 | jnc SHORT .WriteNextBlock |
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| 98 | %endif |
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| 99 | .ReturnWithTransferErrorInAH: |
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| 100 | ret |
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| 101 | |
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| 102 | ALIGN JUMP_ALIGN |
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| 103 | .XferLastBlock: |
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| 104 | xor cx, cx |
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| 105 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 106 | mov ch, [bp+PIOVARS.bSectorsInLastBlock]; CX = Partial block size in WORDs |
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| 107 | %ifdef USE_186 |
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| 108 | push IdeWait_IRQorStatusFlagInBLwithTimeoutInBH |
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| 109 | jmp [bp+PIOVARS.fnXfer] |
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| 110 | %else |
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| 111 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 112 | jmp IdeWait_IRQorStatusFlagInBLwithTimeoutInBH ; Check for errors |
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| 113 | %endif |
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| 114 | |
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| 115 | |
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| 116 | ;-------------------------------------------------------------------- |
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[169] | 117 | ; ReadFromDrive |
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[150] | 118 | ; Parameters: |
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| 119 | ; ES:DI: Normalized ptr to buffer to recieve data |
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| 120 | ; DS:SI: Ptr to DPT (in RAMVARS segment) |
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| 121 | ; SS:BP: Ptr to PIOVARS |
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| 122 | ; Returns: |
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| 123 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 124 | ; AH: BIOS Error code |
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| 125 | ; CF: 0 if transfer succesfull |
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| 126 | ; 1 if any error |
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| 127 | ; Corrupts registers: |
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| 128 | ; AL, BX, CX, DX, SI, ES |
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| 129 | ;-------------------------------------------------------------------- |
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| 130 | ALIGN JUMP_ALIGN |
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[169] | 131 | ReadFromDrive: |
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[150] | 132 | ; Wait until drive is ready to transfer |
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| 133 | xchg di, si ; DS:DI now points DPT |
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| 134 | call IdeWait_IRQorDRQ ; Wait until ready to transfer |
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[169] | 135 | jc SHORT WriteToDrive.ReturnWithTransferErrorInAH |
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[150] | 136 | xchg si, di ; ES:DI now points buffer |
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| 137 | |
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| 138 | ; Transfer full or last (possible partial) block |
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| 139 | mov dx, [bp+PIOVARS.wDataPort] |
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[169] | 140 | dec WORD [bp+PIOVARS.wBlocksLeft] |
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[150] | 141 | jz SHORT .XferLastBlock |
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| 142 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size in WORDs |
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[169] | 143 | call [bp+PIOVARS.fnXfer] ; Transfer full block |
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| 144 | |
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| 145 | ; Normalize pointer when necessary |
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| 146 | mov ax, di |
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| 147 | shr ax, 1 ; WORD offset |
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| 148 | add ax, [bp+PIOVARS.wBlockSize] |
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| 149 | jns SHORT ReadFromDrive |
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[167] | 150 | %ifdef USE_186 |
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[169] | 151 | push ReadFromDrive |
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| 152 | jmp Registers_NormalizeESDI |
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[167] | 153 | %else |
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[169] | 154 | call Registers_NormalizeESDI |
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| 155 | jmp SHORT ReadFromDrive ; Loop while blocks left |
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[167] | 156 | %endif |
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[150] | 157 | |
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[169] | 158 | |
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[150] | 159 | ALIGN JUMP_ALIGN |
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| 160 | .XferLastBlock: |
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| 161 | xor cx, cx |
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| 162 | mov ch, [bp+PIOVARS.bSectorsInLastBlock]; CX = Partial block size in WORDs |
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| 163 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block |
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| 164 | mov di, si ; DS:DI now points DPT |
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| 165 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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| 166 | jmp IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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| 167 | |
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| 168 | |
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| 169 | ;-------------------------------------------------------------------- |
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[169] | 170 | ; InitializePiovarsInSSBPwithSectorCountInAX |
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[150] | 171 | ; Parameters: |
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[169] | 172 | ; AX: Number of sectors to transfer (1...65535) |
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[150] | 173 | ; BX: Offset to transfer function lookup table |
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| 174 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[169] | 175 | ; SS:BP: Ptr to PIOVARS |
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[167] | 176 | ; Returns: |
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[169] | 177 | ; Nothing |
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[150] | 178 | ; Corrupts registers: |
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| 179 | ; AX, BX, CX, DX |
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| 180 | ;-------------------------------------------------------------------- |
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| 181 | ALIGN JUMP_ALIGN |
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[169] | 182 | InitializePiovarsInSSBPwithSectorCountInAX: |
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[150] | 183 | ; Store number of blocks to transfer |
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[169] | 184 | eMOVZX cx, BYTE [di+DPT_ATA.bSetBlock] ; Block size in sectors |
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| 185 | xor dx, dx ; DX:AX = Sectors to transfer (1...65535) |
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| 186 | div cx ; AX = Full blocks to transfer |
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| 187 | test dx, dx |
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| 188 | mov dh, cl ; DH = Full block size if no partial blocks to transfer |
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[150] | 189 | jz SHORT .NoPartialBlocksToTransfer |
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[169] | 190 | inc ax ; Partial block |
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| 191 | mov dh, dl ; DH = Size of partial block in sectors |
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[150] | 192 | .NoPartialBlocksToTransfer: |
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[169] | 193 | mov [bp+PIOVARS.wBlocksLeft], ax |
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| 194 | mov [bp+PIOVARS.bSectorsInLastBlock], dh |
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[150] | 195 | |
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| 196 | ; Store block size in WORDs |
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| 197 | xchg ch, cl ; CX = Block size in WORDs |
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| 198 | mov [bp+PIOVARS.wBlockSize], cx |
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| 199 | |
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| 200 | ; Get transfer function based on bus type |
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[158] | 201 | xchg ax, bx ; Lookup table offset to AX |
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[150] | 202 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS |
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| 203 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address |
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| 204 | mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX |
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| 205 | add bx, ax |
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| 206 | mov ax, [cs:bx] ; Load offset to transfer function |
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| 207 | mov [bp+PIOVARS.wDataPort], dx |
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| 208 | mov [bp+PIOVARS.fnXfer], ax |
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| 209 | ret |
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| 210 | |
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| 211 | |
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| 212 | ;-------------------------------------------------------------------- |
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[152] | 213 | ; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer |
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| 214 | ; SingleByteRead Single port 8-bit PIO read transfer |
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| 215 | ; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 216 | ; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer |
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| 217 | ; DWordRead VLB/PCI 32-bit IDE PIO read transfer |
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[150] | 218 | ; Parameters: |
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| 219 | ; CX: Block size in WORDs |
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| 220 | ; DX: IDE Data port address |
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| 221 | ; ES:DI: Normalized ptr to buffer to recieve data |
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| 222 | ; Returns: |
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| 223 | ; Nothing |
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| 224 | ; Corrupts registers: |
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| 225 | ; AX, BX, CX |
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| 226 | ;-------------------------------------------------------------------- |
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| 227 | ALIGN JUMP_ALIGN |
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[152] | 228 | DualByteReadForXtide: |
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[161] | 229 | %ifdef USE_186 |
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| 230 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 231 | %else |
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[152] | 232 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 233 | %endif |
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[152] | 234 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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[150] | 235 | ALIGN JUMP_ALIGN |
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| 236 | .InswLoop: |
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[152] | 237 | XTIDE_INSW |
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| 238 | XTIDE_INSW |
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| 239 | XTIDE_INSW |
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| 240 | XTIDE_INSW |
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[150] | 241 | loop .InswLoop |
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| 242 | ret |
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| 243 | |
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[152] | 244 | ;---- |
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[150] | 245 | ALIGN JUMP_ALIGN |
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| 246 | SingleByteRead: |
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| 247 | %ifdef USE_186 ; INS instruction available |
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[152] | 248 | shl cx, 1 ; WORD count to BYTE count |
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[150] | 249 | rep insb |
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| 250 | %else ; If 8088/8086 |
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[152] | 251 | shr cx, 1 ; WORD count to DWORD count |
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[150] | 252 | ALIGN JUMP_ALIGN |
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| 253 | .InsdLoop: |
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| 254 | in al, dx |
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[152] | 255 | stosb ; Store to [ES:DI] |
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[150] | 256 | in al, dx |
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| 257 | stosb |
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| 258 | in al, dx |
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| 259 | stosb |
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| 260 | in al, dx |
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| 261 | stosb |
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| 262 | loop .InsdLoop |
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| 263 | %endif |
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| 264 | ret |
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| 265 | |
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[152] | 266 | ;---- |
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| 267 | %ifndef USE_186 |
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| 268 | ALIGN JUMP_ALIGN |
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| 269 | WordReadForXTIDEmod: |
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| 270 | times 2 shr cx, 1 ; WORD count to QWORD count |
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| 271 | ALIGN JUMP_ALIGN |
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| 272 | .ReadNextQword: |
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| 273 | in ax, dx ; Read 1st WORD |
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| 274 | stosw ; Store 1st WORD to [ES:DI] |
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| 275 | in ax, dx |
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| 276 | stosw ; 2nd |
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| 277 | in ax, dx |
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| 278 | stosw ; 3rd |
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| 279 | in ax, dx |
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| 280 | stosw ; 4th |
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| 281 | loop .ReadNextQword |
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| 282 | ret |
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| 283 | %endif |
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[150] | 284 | |
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[152] | 285 | ;---- |
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| 286 | ALIGN JUMP_ALIGN |
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| 287 | WordReadForXTplusAndAT: |
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| 288 | rep |
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| 289 | db 6Dh ; INSW (we want this in XT build) |
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| 290 | ret |
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| 291 | |
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| 292 | ;---- |
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| 293 | ALIGN JUMP_ALIGN |
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| 294 | DWordRead: |
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| 295 | shr cx, 1 ; WORD count to DWORD count |
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| 296 | rep |
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| 297 | db 66h ; Override operand size to 32-bit |
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| 298 | db 6Dh ; INSW/INSD |
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| 299 | ret |
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| 300 | |
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| 301 | |
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[150] | 302 | ;-------------------------------------------------------------------- |
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[152] | 303 | ; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer |
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| 304 | ; SingleByteWrite Single port 8-bit PIO write transfer |
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| 305 | ; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer |
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| 306 | ; WordWrite Normal 16-bit IDE PIO write transfer |
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| 307 | ; DWordWrite VLB/PCI 32-bit IDE PIO write transfer |
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[150] | 308 | ; Parameters: |
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| 309 | ; CX: Block size in WORDs |
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| 310 | ; DX: IDE Data port address |
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| 311 | ; ES:SI: Normalized ptr to buffer containing data |
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| 312 | ; Returns: |
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| 313 | ; Nothing |
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| 314 | ; Corrupts registers: |
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| 315 | ; AX, CX |
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| 316 | ;-------------------------------------------------------------------- |
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| 317 | ALIGN JUMP_ALIGN |
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[152] | 318 | DualByteWriteForXtide: |
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[150] | 319 | push ds |
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| 320 | push bx |
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[161] | 321 | %ifdef USE_186 |
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| 322 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 323 | %else |
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[152] | 324 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 325 | %endif |
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[152] | 326 | mov bx, 8 ; Bit mask for toggling data low/high reg |
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| 327 | push es ; Copy ES... |
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| 328 | pop ds ; ...to DS |
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[150] | 329 | ALIGN JUMP_ALIGN |
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| 330 | .OutswLoop: |
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[152] | 331 | XTIDE_OUTSW |
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| 332 | XTIDE_OUTSW |
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| 333 | XTIDE_OUTSW |
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| 334 | XTIDE_OUTSW |
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[150] | 335 | loop .OutswLoop |
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| 336 | pop bx |
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| 337 | pop ds |
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| 338 | ret |
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| 339 | |
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[152] | 340 | ;---- |
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[150] | 341 | ALIGN JUMP_ALIGN |
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| 342 | SingleByteWrite: |
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| 343 | %ifdef USE_186 ; OUTS instruction available |
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[152] | 344 | shl cx, 1 ; WORD count to BYTE count |
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| 345 | eSEG es ; Source is ES segment |
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[150] | 346 | rep outsb |
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| 347 | %else ; If 8088/8086 |
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[152] | 348 | shr cx, 1 ; WORD count to DWORD count |
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| 349 | push ds ; Store DS |
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| 350 | push es ; Copy ES... |
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| 351 | pop ds ; ...to DS |
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[150] | 352 | ALIGN JUMP_ALIGN |
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| 353 | .OutsdLoop: |
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[152] | 354 | lodsb ; Load from [DS:SI] to AL |
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[150] | 355 | out dx, al |
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| 356 | lodsb |
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| 357 | out dx, al |
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| 358 | lodsb |
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| 359 | out dx, al |
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| 360 | lodsb |
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| 361 | out dx, al |
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| 362 | loop .OutsdLoop |
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[152] | 363 | pop ds ; Restore DS |
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[150] | 364 | %endif |
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| 365 | ret |
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| 366 | |
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[152] | 367 | ;--- |
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| 368 | ALIGN JUMP_ALIGN |
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| 369 | WordWriteForXTIDEmod: |
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| 370 | push ds |
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[161] | 371 | %ifdef USE_186 |
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| 372 | shr cx, 2 ; Smaller but slower on 186/286 |
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| 373 | %else |
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[152] | 374 | times 2 shr cx, 1 ; Loop unrolling |
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[161] | 375 | %endif |
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[152] | 376 | push es ; Copy ES... |
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| 377 | pop ds ; ...to DS |
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| 378 | ALIGN JUMP_ALIGN |
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| 379 | .WriteNextQword: |
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| 380 | XTIDE_MOD_OUTSW |
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| 381 | XTIDE_MOD_OUTSW |
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| 382 | XTIDE_MOD_OUTSW |
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| 383 | XTIDE_MOD_OUTSW |
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| 384 | loop .WriteNextQword |
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| 385 | pop ds |
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| 386 | ret |
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[150] | 387 | |
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[152] | 388 | ;---- |
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| 389 | ALIGN JUMP_ALIGN |
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| 390 | WordWrite: |
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| 391 | eSEG es ; Source is ES segment |
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| 392 | rep |
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[155] | 393 | db 6Fh ; OUTSW (we want this in XT build) |
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[152] | 394 | ret |
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| 395 | |
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| 396 | ALIGN JUMP_ALIGN |
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| 397 | DWordWrite: |
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| 398 | shr cx, 1 ; WORD count to DWORD count |
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| 399 | eSEG es ; Source is ES segment |
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| 400 | rep |
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| 401 | db 66h ; Override operand size to 32-bit |
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| 402 | db 6Fh ; OUTSW/OUTSD |
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| 403 | ret |
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| 404 | |
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| 405 | |
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| 406 | |
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[150] | 407 | ; Lookup tables to get transfer function based on bus type |
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| 408 | ALIGN WORD_ALIGN |
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| 409 | g_rgfnPioRead: |
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[152] | 410 | dw DualByteReadForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE |
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| 411 | %ifdef USE_186 |
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| 412 | dw WordReadForXTplusAndAT ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0 |
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| 413 | %else |
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| 414 | dw WordReadForXTIDEmod |
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| 415 | %endif |
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| 416 | dw SingleByteRead ; DEVICE_8BIT_SINGLE_PORT |
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| 417 | dw WordReadForXTplusAndAT ; DEVICE_16BIT_ATA |
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| 418 | dw DWordRead ; DEVICE_32BIT_ATA |
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| 419 | |
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[150] | 420 | g_rgfnPioWrite: |
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[152] | 421 | dw DualByteWriteForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE |
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| 422 | dw WordWriteForXTIDEmod ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0 |
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| 423 | dw SingleByteWrite ; DEVICE_8BIT_SINGLE_PORT |
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| 424 | dw WordWrite ; DEVICE_16BIT_ATA |
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| 425 | dw DWordWrite ; DEVICE_32BIT_ATA |
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