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