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