1 | ; Project name : XTIDE Universal BIOS
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2 | ; Description : Command and port direction functions for different device types.
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3 |
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4 | ; Section containing code
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5 | SECTION .text
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6 |
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7 | ;--------------------------------------------------------------------
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8 | ; Device_FinalizeDPT
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9 | ; Parameters:
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10 | ; DS:DI: Ptr to Disk Parameter Table
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11 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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12 | ; Returns:
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13 | ; Nothing
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14 | ; Corrupts registers:
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15 | ; AX, BX, CX, DX
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16 | ;--------------------------------------------------------------------
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17 | Device_FinalizeDPT:
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18 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
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19 | jnz SHORT ReturnSuccessForSerialPort
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20 | jmp IdeDPT_Finalize
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21 | .FinalizeDptForSerialPortDevice:
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22 | jmp SerialDPT_Finalize
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23 |
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24 |
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25 | ;--------------------------------------------------------------------
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26 | ; Device_ResetMasterAndSlaveController
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27 | ; Parameters:
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28 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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29 | ; Returns:
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30 | ; AH: INT 13h Error Code
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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, CX, DX
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34 | ;--------------------------------------------------------------------
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35 | Device_ResetMasterAndSlaveController:
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36 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
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37 | jnz SHORT ReturnSuccessForSerialPort
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38 | jmp IdeCommand_ResetMasterAndSlaveController
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39 |
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40 |
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41 | ;--------------------------------------------------------------------
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42 | ; Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
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43 | ; Parameters:
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44 | ; BH: Drive Select byte for Drive and Head Select Register
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45 | ; DS: Segment to RAMVARS
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46 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information
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47 | ; CS:BP: Ptr to IDEVARS
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48 | ; Returns:
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49 | ; AH: INT 13h Error Code
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50 | ; CF: Cleared if success, Set if error
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51 | ; Corrupts registers:
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52 | ; AL, BL, CX, DX, SI, DI, ES
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53 | ;--------------------------------------------------------------------
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54 | Device_IdentifyToBufferInESSIwithDriveSelectByteInBH:
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55 | cmp BYTE [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT
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56 | je SHORT .IdentifyDriveFromSerialPort
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57 | jmp IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
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58 | .IdentifyDriveFromSerialPort:
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59 | jmp SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
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60 |
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61 |
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62 | ;--------------------------------------------------------------------
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63 | ; Device_OutputCommandWithParameters
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64 | ; Parameters:
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65 | ; BH: Default system timer ticks for timeout (can be ignored)
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66 | ; BL: IDE Status Register bit to poll after command
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67 | ; ES:SI: Ptr to buffer (for data transfer commands)
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68 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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69 | ; SS:BP: Ptr to IDEPACK
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70 | ; Returns:
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71 | ; AH: INT 13h Error Code
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72 | ; CF: Cleared if success, Set if error
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73 | ; Corrupts registers:
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74 | ; AL, BX, CX, DX, (ES:SI for data transfer commands)
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75 | ;--------------------------------------------------------------------
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76 | ALIGN JUMP_ALIGN
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77 | Device_OutputCommandWithParameters:
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78 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
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79 | jnz SHORT .OutputCommandToSerialPort
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80 | jmp IdeCommand_OutputWithParameters
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81 | ALIGN JUMP_ALIGN
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82 | .OutputCommandToSerialPort:
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83 | jmp SerialCommand_OutputWithParameters
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84 |
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85 |
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86 | ;--------------------------------------------------------------------
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87 | ; Device_SelectDrive
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88 | ; Parameters:
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89 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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90 | ; SS:BP: Ptr to IDEPACK
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91 | ; Returns:
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92 | ; AH: INT 13h Error Code
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93 | ; CF: Cleared if success, Set if error
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94 | ; Corrupts registers:
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95 | ; AL, BX, CX, DX
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96 | ;--------------------------------------------------------------------
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97 | ALIGN JUMP_ALIGN
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98 | Device_SelectDrive:
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99 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
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100 | jnz SHORT ReturnSuccessForSerialPort
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101 | jmp IdeCommand_SelectDrive
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102 | ReturnSuccessForSerialPort:
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103 | xor ax, ax
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104 | ret
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105 |
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106 |
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107 | ;--------------------------------------------------------------------
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108 | ; Device_OutputALtoIdeRegisterInDL
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109 | ; Parameters:
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110 | ; AL: Byte to output
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111 | ; DL: IDE Register
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112 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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113 | ; Returns:
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114 | ; Nothing
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115 | ; Corrupts registers:
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116 | ; BX, DX
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117 | ;--------------------------------------------------------------------
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118 | ALIGN JUMP_ALIGN
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119 | Device_OutputALtoIdeRegisterInDL:
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120 | mov bx, IdeIO_OutputALtoIdeRegisterInDX
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121 | jmp SHORT TranslateRegisterAddressInDLifNecessaryThenJumpToBX
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122 |
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123 |
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124 | ;--------------------------------------------------------------------
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125 | ; Device_OutputALtoIdeControlBlockRegisterInDL
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126 | ; Parameters:
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127 | ; AL: Byte to output
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128 | ; DL: IDE Control Block Register
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129 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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130 | ; Returns:
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131 | ; Nothing
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132 | ; Corrupts registers:
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133 | ; BX, DX
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134 | ;--------------------------------------------------------------------
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135 | ALIGN JUMP_ALIGN
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136 | Device_OutputALtoIdeControlBlockRegisterInDL:
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137 | mov bx, IdeIO_OutputALtoIdeControlBlockRegisterInDX
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138 | jmp SHORT TranslateRegisterAddressInDLifNecessaryThenJumpToBX
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139 |
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140 |
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141 | ;--------------------------------------------------------------------
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142 | ; Device_InputToALfromIdeRegisterInDL
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143 | ; Parameters:
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144 | ; DL: IDE Register
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145 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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146 | ; Returns:
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147 | ; AL: Inputted byte
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148 | ; Corrupts registers:
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149 | ; BX, DX
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150 | ;--------------------------------------------------------------------
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151 | ALIGN JUMP_ALIGN
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152 | Device_InputToALfromIdeRegisterInDL:
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153 | mov bx, IdeIO_InputToALfromIdeRegisterInDX
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154 | ; Fall to TranslateRegisterAddressInDLifNecessaryThenJumpToBX
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155 |
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156 |
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157 | ;--------------------------------------------------------------------
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158 | ; TranslateRegisterAddressInDLifNecessaryThenJumpToBX
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159 | ; Parameters:
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160 | ; AL: Byte to output (if output function in BX)
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161 | ; DL: IDE Register
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162 | ; BX: I/O function to jump to
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163 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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164 | ; Returns:
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165 | ; AL: Inputted byte (if input function in BX)
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166 | ; Corrupts registers:
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167 | ; BX, DX
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168 | ;--------------------------------------------------------------------
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169 | TranslateRegisterAddressInDLifNecessaryThenJumpToBX:
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170 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_REVERSED_A0_AND_A3
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171 | jz SHORT .JumpToIoFunctionInSI
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172 |
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173 | ; Exchange address lines A0 and A3 from DL
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174 | mov dh, MASK_A3_AND_A0_ADDRESS_LINES
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175 | and dh, dl ; DH = 0, 1, 8 or 9, we can ignore 0 and 9
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176 | jz SHORT .JumpToIoFunctionInSI ; Jump out since DH is 0
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177 | xor dh, MASK_A3_AND_A0_ADDRESS_LINES
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178 | jz SHORT .JumpToIoFunctionInSI ; Jump out since DH was 9
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179 | and dl, ~MASK_A3_AND_A0_ADDRESS_LINES
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180 | or dl, dh ; Address lines now reversed
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181 |
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182 | ALIGN JUMP_ALIGN
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183 | .JumpToIoFunctionInSI:
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184 | push bx
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185 | xor dh, dh
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186 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset]; CS:BX now points to IDEVARS
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187 | ret
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