1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Memory mapped 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 MEMPIOVARS |
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7 | .wWordsInBlock resb 2 ; 0, Block size in WORDs |
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8 | .wWordsLeft resb 2 ; 2, WORDs left to transfer |
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9 | .wWordsDone resb 2 ; 4, Number of sectors xferred |
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10 | resb 1 ; 6, |
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11 | resb 1 ; 7, IDEPACK.bDeviceControl |
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12 | .fpDPT resb 4 ; 8, Far pointer to DPT |
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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 | ; MemIdeTransfer_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 | ; (all PIO read and write commands including Identify Device) |
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24 | ; ES:SI: Ptr to normalized data buffer |
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25 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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26 | ; SS:BP: Ptr to IDEPACK |
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27 | ; Returns: |
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28 | ; AH: INT 13h Error Code |
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29 | ; CX: Number of successfully transferred sectors |
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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, DX, SI, ES |
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33 | ;-------------------------------------------------------------------- |
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34 | ALIGN JUMP_ALIGN |
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35 | MemIdeTransfer_StartWithCommandInAL: |
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36 | ; Initialize MEMPIOVARS |
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37 | xchg cx, ax ; IDE command to CL |
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38 | xor al, al |
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39 | mov ah, [bp+IDEPACK.bSectorCount] |
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40 | mov [bp+MEMPIOVARS.wWordsLeft], ax |
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41 | cbw |
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42 | mov [bp+MEMPIOVARS.wWordsDone], ax ; Zero |
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43 | mov ah, [di+DPT_ATA.bSetBlock] |
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44 | mov [bp+MEMPIOVARS.wWordsInBlock], ax |
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45 | mov [bp+MEMPIOVARS.fpDPT], di |
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46 | mov [bp+MEMPIOVARS.fpDPT+2], ds |
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47 | |
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48 | ; Are we reading or writing? |
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49 | test cl, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands |
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50 | jnz SHORT .PrepareToWriteDataFromESSI |
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51 | cmp cl, COMMAND_WRITE_MULTIPLE |
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52 | je SHORT .PrepareToWriteDataFromESSI |
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53 | |
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54 | ; Prepare to read data to ES:DI |
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55 | mov di, si |
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56 | push cs |
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57 | pop ds |
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58 | mov si, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET |
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59 | jmp SHORT ReadFromSectorAccessWindowInDSSItoESDI |
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60 | |
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61 | ALIGN JUMP_ALIGN |
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62 | .PrepareToWriteDataFromESSI: |
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63 | push es |
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64 | pop ds |
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65 | push cs |
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66 | pop es |
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67 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET |
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68 | ; Fall to WriteToSectorAccessWindowInESDIfromDSSI |
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69 | |
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70 | |
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71 | ;-------------------------------------------------------------------- |
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72 | ; WriteToSectorAccessWindowInESDIfromDSSI |
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73 | ; Parameters: |
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74 | ; DS:SI: Normalized ptr to buffer containing data |
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75 | ; ES:DI: Ptr to Sector Access Window |
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76 | ; SS:BP: Ptr to MEMPIOVARS |
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77 | ; Returns: |
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78 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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79 | ; AH: BIOS Error code |
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80 | ; CX: Number of successfully transferred sectors |
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81 | ; CF: 0 if transfer succesfull |
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82 | ; 1 if any error |
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83 | ; Corrupts registers: |
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84 | ; AL, BX, DX, SI, ES |
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85 | ;-------------------------------------------------------------------- |
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86 | WriteToSectorAccessWindowInESDIfromDSSI: |
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87 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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88 | call WaitUntilReadyToTransferNextBlock |
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89 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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90 | |
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91 | ALIGN JUMP_ALIGN |
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92 | .WriteNextBlockToDrive: |
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93 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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94 | cmp [bp+PIOVARS.wWordsLeft], cx |
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95 | jbe SHORT .WriteLastBlockToDrive |
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96 | eMOVZX dx, ch ; DX = Sectors in block |
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97 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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98 | call WaitUntilReadyToTransferNextBlock |
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99 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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100 | |
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101 | ; Increment number of successfully written WORDs |
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102 | mov ax, [bp+PIOVARS.wWordsInBlock] |
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103 | sub [bp+PIOVARS.wWordsLeft], ax |
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104 | add [bp+PIOVARS.wWordsDone], ax |
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105 | jmp SHORT .WriteNextBlockToDrive |
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106 | |
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107 | ALIGN JUMP_ALIGN |
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108 | .WriteLastBlockToDrive: |
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109 | eMOVZX dx, BYTE [bp+PIOVARS.wWordsLeft+1] ; Sectors left |
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110 | %ifdef USE_186 |
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111 | push CheckErrorsAfterTransferringLastMemoryMappedBlock |
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112 | jmp WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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113 | %else |
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114 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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115 | jmp SHORT CheckErrorsAfterTransferringLastMemoryMappedBlock |
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116 | %endif |
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117 | |
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118 | |
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119 | ;-------------------------------------------------------------------- |
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120 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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121 | ; Parameters: |
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122 | ; DX: Number of sectors in block |
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123 | ; DS:SI: Normalized ptr to source buffer |
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124 | ; ES:DI: Ptr to Sector Access Window |
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125 | ; Returns: |
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126 | ; CX, DX: Zero |
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127 | ; SI: Updated |
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128 | ; Corrupts registers: |
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129 | ; Nothing |
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130 | ;-------------------------------------------------------------------- |
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131 | ALIGN JUMP_ALIGN |
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132 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI: |
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133 | mov cx, JRIDE_SECTOR_ACCESS_WINDOW_SIZE / 2 |
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134 | rep movsw |
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135 | sub di, JRIDE_SECTOR_ACCESS_WINDOW_SIZE ; Reset for next sector |
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136 | dec dx |
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137 | jnz SHORT WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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138 | ret |
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139 | |
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140 | |
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141 | ;-------------------------------------------------------------------- |
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142 | ; ReadFromSectorAccessWindowInDSSItoESDI |
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143 | ; Parameters: |
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144 | ; ES:DI: Normalized ptr to buffer to recieve data |
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145 | ; DS:SI: Ptr to Sector Access Window |
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146 | ; SS:BP: Ptr to MEMPIOVARS |
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147 | ; Returns: |
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148 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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149 | ; AH: BIOS Error code |
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150 | ; CX: Number of successfully transferred sectors |
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151 | ; CF: 0 if transfer succesfull |
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152 | ; 1 if any error |
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153 | ; Corrupts registers: |
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154 | ; AL, BX, DX, SI, ES |
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155 | ;-------------------------------------------------------------------- |
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156 | ALIGN JUMP_ALIGN |
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157 | ReadFromSectorAccessWindowInDSSItoESDI: |
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158 | call WaitUntilReadyToTransferNextBlock |
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159 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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160 | |
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161 | ALIGN JUMP_ALIGN |
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162 | .ReadNextBlockFromDrive: |
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163 | mov cx, [bp+PIOVARS.wWordsInBlock] |
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164 | cmp [bp+PIOVARS.wWordsLeft], cx |
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165 | jbe SHORT .ReadLastBlockFromDrive |
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166 | eMOVZX dx, ch ; DX = Sectors in block |
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167 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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168 | call WaitUntilReadyToTransferNextBlock |
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169 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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170 | |
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171 | ; Increment number of successfully read WORDs |
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172 | mov ax, [bp+PIOVARS.wWordsInBlock] |
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173 | sub [bp+PIOVARS.wWordsLeft], ax |
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174 | add [bp+PIOVARS.wWordsDone], ax |
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175 | jmp SHORT .ReadNextBlockFromDrive |
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176 | |
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177 | ALIGN JUMP_ALIGN |
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178 | .ReadLastBlockFromDrive: |
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179 | eMOVZX dx, BYTE [bp+PIOVARS.wWordsLeft+1] ; Sectors left |
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180 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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181 | |
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182 | ; Check for errors in last block |
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183 | CheckErrorsAfterTransferringLastMemoryMappedBlock: |
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184 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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185 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY) |
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186 | call IDEDEVICE%+Wait_PollStatusFlagInBLwithTimeoutInBH |
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187 | |
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188 | ; Return number of successfully read sectors |
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189 | ReturnWithMemoryIOtransferErrorInAH: |
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190 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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191 | mov cx, [bp+PIOVARS.wWordsDone] |
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192 | jc SHORT .ConvertTransferredWordsInCXtoSectors |
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193 | add cx, [bp+PIOVARS.wWordsLeft] ; Never sets CF |
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194 | .ConvertTransferredWordsInCXtoSectors: |
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195 | xchg cl, ch |
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196 | ret |
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197 | |
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198 | |
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199 | ;-------------------------------------------------------------------- |
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200 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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201 | ; Parameters: |
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202 | ; DX: Number of sectors in block |
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203 | ; ES:DI: Normalized ptr to buffer to recieve data (destination) |
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204 | ; DS:SI: Ptr to Sector Access Window (source) |
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205 | ; Returns: |
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206 | ; CX, DX: Zero |
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207 | ; DI: Updated |
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208 | ; Corrupts registers: |
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209 | ; Nothing |
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210 | ;-------------------------------------------------------------------- |
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211 | ALIGN JUMP_ALIGN |
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212 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI: |
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213 | mov cx, JRIDE_SECTOR_ACCESS_WINDOW_SIZE / 2 |
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214 | rep movsw |
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215 | sub si, JRIDE_SECTOR_ACCESS_WINDOW_SIZE ; Reset for next sector |
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216 | dec dx |
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217 | jnz SHORT ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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218 | ret |
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219 | |
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220 | |
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221 | ;-------------------------------------------------------------------- |
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222 | ; WaitUntilReadyToTransferNextBlock |
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223 | ; Parameters: |
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224 | ; SS:BP: Ptr to MEMPIOVARS |
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225 | ; Returns: |
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226 | ; AH: INT 13h Error Code |
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227 | ; CF: Cleared if success, Set if error |
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228 | ; Corrupts registers: |
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229 | ; AL, BX, CX, DX |
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230 | ;-------------------------------------------------------------------- |
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231 | ALIGN JUMP_ALIGN |
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232 | WaitUntilReadyToTransferNextBlock: |
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233 | push ds |
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234 | push di |
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235 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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236 | call IDEDEVICE%+Wait_IRQorDRQ ; Always polls |
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237 | pop di |
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238 | pop ds |
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239 | ret |
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