1 | ; Project name : XTIDE Universal BIOS
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2 | ; Description : Functions for creating Disk Parameter Table.
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3 |
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4 | ;
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5 | ; XTIDE Universal BIOS and Associated Tools
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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7 | ;
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8 | ; This program is free software; you can redistribute it and/or modify
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9 | ; it under the terms of the GNU General Public License as published by
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10 | ; the Free Software Foundation; either version 2 of the License, or
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11 | ; (at your option) any later version.
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12 | ;
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13 | ; This program is distributed in the hope that it will be useful,
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | ; GNU General Public License for more details.
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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18 | ;
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19 |
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20 | ; Section containing code
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21 | SECTION .text
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22 |
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23 | ;--------------------------------------------------------------------
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24 | ; Creates new Disk Parameter Table for detected hard disk.
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25 | ; Drive is then fully accessible using any BIOS function.
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26 | ;
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27 | ; CreateDPT_FromAtaInformation
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28 | ; Parameters:
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29 | ; BH: Drive Select byte for Drive and Head Register
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30 | ; DX: Autodetected port (for devices that support autodetection)
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31 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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32 | ; CS:BP: Ptr to IDEVARS for the controller
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33 | ; DS: RAMVARS segment
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34 | ; ES: BDA Segment
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35 | ; Returns:
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36 | ; DS:DI: Ptr to Disk Parameter Table (if successful)
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37 | ; CF: Cleared if DPT created successfully
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38 | ; Set if any error
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39 | ; Corrupts registers:
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40 | ; AX, BX, CX, DH
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41 | ;--------------------------------------------------------------------
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42 | CreateDPT_FromAtaInformation:
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43 | call FindDPT_ForNewDriveToDSDI
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44 | ; Fall to .InitializeDPT
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45 |
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46 | ;--------------------------------------------------------------------
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47 | ; .InitializeDPT
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48 | ; Parameters:
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49 | ; BH: Drive Select byte for Drive and Head Register
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50 | ; DX: Autodetected port (for devices that support autodetection)
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51 | ; DS:DI: Ptr to Disk Parameter Table
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52 | ; CS:BP: Ptr to IDEVARS for the controller
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53 | ; Returns:
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54 | ; Nothing
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55 | ; Corrupts registers:
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56 | ; AX
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57 | ;--------------------------------------------------------------------
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58 | .InitializeDPT:
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59 | call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
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60 | ; Fall to .StoreDriveSelectAndDriveControlByte
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61 |
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62 | ;--------------------------------------------------------------------
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63 | ; .StoreDriveSelectAndDriveControlByte
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64 | ; Parameters:
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65 | ; BH: Drive Select byte for Drive and Head Register
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66 | ; DS:DI: Ptr to Disk Parameter Table
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67 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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68 | ; CS:BP: Ptr to IDEVARS for the controller
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69 | ; Returns:
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70 | ; Nothing
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71 | ; Corrupts registers:
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72 | ; AX
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73 | ;--------------------------------------------------------------------
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74 | .StoreDriveSelectAndDriveControlByte:
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75 | mov al, bh
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76 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
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77 | %ifdef MODULE_IRQ
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78 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
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79 | jz SHORT .StoreFlags ; If not, do not set interrupt flag
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80 | or al, FLGL_DPT_ENABLE_IRQ
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81 | .StoreFlags:
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82 | %endif
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83 | mov [di+DPT.wFlags], ax
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84 | ; Fall to .StoreCHSparametersAndAddressingMode
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85 |
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86 | ;--------------------------------------------------------------------
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87 | ; .StoreCHSparametersAndAddressingMode
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88 | ; Parameters:
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89 | ; DS:DI: Ptr to Disk Parameter Table
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90 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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91 | ; CS:BP: Ptr to IDEVARS for the controller
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92 | ; Returns:
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93 | ; Nothing
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94 | ; Corrupts registers:
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95 | ; AX, BX, CX, DX
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96 | ;--------------------------------------------------------------------
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97 | .StoreCHSparametersAndAddressingMode:
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98 | ; Check if CHS defined in ROMVARS
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99 | call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
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100 | test cl, FLG_DRVPARAMS_USERCHS
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101 | jz SHORT .AutodetectPCHSvalues
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102 |
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103 | ; Translate P-CHS to L-CHS
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104 | call AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX
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105 | jmp SHORT .StoreLCHStoDPT
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106 | .AutodetectPCHSvalues:
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107 | call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX
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108 |
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109 | .StoreLCHStoDPT:
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110 | eSHL_IM dl, TRANSLATEMODE_FIELD_POSITION
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111 | or cl, dl
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112 | or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode
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113 | mov [di+DPT.wLchsCylinders], ax
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114 | mov [di+DPT.wLchsHeadsAndSectors], bx
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115 |
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116 | ; Store P-CHS to DPT
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117 | call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
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118 | mov [di+DPT.bPchsHeads], bl
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119 | %ifdef MODULE_EBIOS
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120 | mov [di+DPT.wPchsCylinders], ax
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121 | mov [di+DPT.bPchsSectorsPerTrack], bh
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122 | ; Fall to .StoreNumberOfLbaSectors
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123 |
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124 | ;--------------------------------------------------------------------
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125 | ; .StoreNumberOfLbaSectors
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126 | ; Parameters:
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127 | ; DS:DI: Ptr to Disk Parameter Table
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128 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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129 | ; CS:BP: Ptr to IDEVARS for the controller
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130 | ; Returns:
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131 | ; Nothing
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132 | ; Corrupts registers:
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133 | ; AX, BX, CX, DX
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134 | ;--------------------------------------------------------------------
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135 | ; Check if LBA supported
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136 | test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
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137 | jz SHORT .NoLbaSupportedSoNoEBIOS
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138 |
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139 | ; Store LBA 28/48 total sector count
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140 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
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141 | call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
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142 |
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143 | ; Load user defined LBA
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144 | call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
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145 | test cl, FLG_DRVPARAMS_USERLBA
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146 | jz SHORT .KeepTotalSectorsFromAtaID
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147 |
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148 | ; Compare user defined and ATA-ID sector count and select smaller
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149 | mov dx, bx
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150 | xor bx, bx ; User defined LBA now in BX:DX:AX
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151 | cmp bx, [di+DPT.twLbaSectors+4]
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152 | jb SHORT .StoreUserDefinedSectorCountToDPT
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153 | cmp dx, [di+DPT.twLbaSectors+2]
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154 | jb SHORT .StoreUserDefinedSectorCountToDPT
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155 | ja SHORT .KeepTotalSectorsFromAtaID
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156 | cmp ax, [di+DPT.twLbaSectors]
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157 | jae SHORT .KeepTotalSectorsFromAtaID
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158 | .StoreUserDefinedSectorCountToDPT:
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159 | ; CL bit FLGL_DPT_LBA48 is clear at this point
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160 | call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
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161 |
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162 | .KeepTotalSectorsFromAtaID:
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163 | .NoLbaSupportedSoNoEBIOS:
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164 | %endif ; MODULE_EBIOS
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165 | ; Fall to .StoreBlockMode
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166 |
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167 | ;--------------------------------------------------------------------
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168 | ; .StoreBlockMode
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169 | ; Parameters:
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170 | ; DS:DI: Ptr to Disk Parameter Table
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171 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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172 | ; CS:BP: Ptr to IDEVARS for the controller
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173 | ; Returns:
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174 | ; Nothing
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175 | ; Corrupts registers:
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176 | ; Nothing
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177 | ;--------------------------------------------------------------------
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178 | .StoreBlockMode:
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179 | cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
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180 | jbe SHORT .BlockModeTransfersNotSupported
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181 | or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
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182 | .BlockModeTransfersNotSupported:
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183 | ; Fall to .StoreDeviceSpecificParameters
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184 |
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185 | ;--------------------------------------------------------------------
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186 | ; .StoreDeviceSpecificParameters
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187 | ; Parameters:
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188 | ; DS:DI: Ptr to Disk Parameter Table
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189 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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190 | ; CS:BP: Ptr to IDEVARS for the controller
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191 | ; Returns:
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192 | ; Nothing
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193 | ; Corrupts registers:
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194 | ; AX, BX, CX, DX
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195 | ;--------------------------------------------------------------------
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196 | .StoreDeviceSpecificParameters:
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197 | call Device_FinalizeDPT
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198 |
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199 | ;----------------------------------------------------------------------
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200 | ; Update drive counts (hard and floppy)
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201 | ;----------------------------------------------------------------------
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202 |
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203 | %ifdef MODULE_SERIAL_FLOPPY
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204 | ;
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205 | ; These two instructions serve two purposes:
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206 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
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207 | ; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
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208 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
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209 | ; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
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210 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
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211 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
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212 | ; B. the auto serial code is always executed last
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213 | ; C. the serial server always returns floppy drives last
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214 | ;
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215 | adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
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216 | jnz .AllDone
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217 | %else
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218 | ;
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219 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
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220 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
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221 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
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222 | ;
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223 | jc .AllDone
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224 | %endif
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225 |
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226 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
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227 |
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228 | .AllDone:
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229 | clc
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230 | ret
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231 |
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232 |
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233 | ;--------------------------------------------------------------------
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234 | ; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
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235 | ; Parameters:
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236 | ; DX: Autodetected port (for devices that support autodetection)
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237 | ; DS:DI: Ptr to Disk Parameter Table
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238 | ; CS:BP: Ptr to IDEVARS for the controller
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239 | ; Returns:
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240 | ; Nothing
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241 | ; Corrupts registers:
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242 | ; AX
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243 | ;--------------------------------------------------------------------
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244 | CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
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245 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
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246 |
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247 | %ifdef MODULE_8BIT_IDE
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248 | call DetectDrives_DoesIdevarsInCSBPbelongToXTCF
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249 | jne SHORT .DeviceUsesPortSpecifiedInIDEVARS
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250 | mov [di+DPT.wBasePort], dx
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251 | ret
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252 | .DeviceUsesPortSpecifiedInIDEVARS:
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253 | %endif ; MODULE_8BIT_IDE
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254 |
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255 | mov ax, [cs:bp+IDEVARS.wBasePort]
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256 | mov [di+DPT.wBasePort], ax
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257 | ret
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258 |
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259 |
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260 | ;--------------------------------------------------------------------
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261 | ; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
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262 | ; Parameters:
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263 | ; DS:DI: Ptr to Disk Parameter Table
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264 | ; Returns:
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265 | ; AX: User defined P-CHS Cylinders or LBA low word
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266 | ; BX: User defined P-CHS Heads and Sectors or LBA high word
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267 | ; DX: Translate mode or TRANSLATEMODE_AUTO
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268 | ; CX: FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX
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269 | ; FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX
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270 | ; Zero if user has not defined capacity
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271 | ; Corrupts registers:
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272 | ; Nothing
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273 | ;--------------------------------------------------------------------
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274 | GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS:
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275 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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276 |
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277 | ; Get settings
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278 | mov cx, [cs:bx+DRVPARAMS.wFlags]
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279 | mov dx, cx
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280 | and cx, BYTE FLG_DRVPARAMS_USERCHS | FLG_DRVPARAMS_USERLBA
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281 | and dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE
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282 | eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION
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283 |
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284 | ; Get capacity
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285 | mov ax, [cs:bx+DRVPARAMS.wCylinders] ; Or .dwMaximumLBA
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286 | mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors] ; Or .dwMaximumLBA+2
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287 | ret
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288 |
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289 |
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290 | %ifdef MODULE_EBIOS
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291 | ;--------------------------------------------------------------------
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292 | ; StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
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293 | ; Parameters:
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294 | ; BX:DX:AX: Total Sector Count
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295 | ; CL: FLGL_DPT_LBA48 if LBA48 supported
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296 | ; DS:DI: Ptr to Disk Parameter Table
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297 | ; Returns:
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298 | ; Nothing
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299 | ; Corrupts registers:
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300 | ; CL
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301 | ;--------------------------------------------------------------------
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302 | StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX:
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303 | or cl, FLGL_DPT_LBA_AND_EBIOS_SUPPORTED
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304 | and BYTE [di+DPT.bFlagsLow], ~FLGL_DPT_LBA48
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305 | or [di+DPT.bFlagsLow], cl
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306 | mov [di+DPT.twLbaSectors], ax
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307 | mov [di+DPT.twLbaSectors+2], dx
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308 | mov [di+DPT.twLbaSectors+4], bx
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309 | ret
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310 | %endif ; MODULE_EBIOS
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