1 | ; Project name : XTIDE Universal BIOS
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2 | ; Description : Int 13h function AH=0h, Disk Controller Reset.
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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 | ; Int 13h function AH=0h, Disk Controller Reset.
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25 | ;
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26 | ; Note: We handle all AH=0h calls, even for drives handled by other
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27 | ; BIOSes!
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28 | ;
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29 | ; AH0h_HandlerForDiskControllerReset
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30 | ; Parameters:
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31 | ; DL: Translated Drive number (ignored so all drives are reset)
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32 | ; If bit 7 is set all hard disks and floppy disks reset.
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33 | ; DS:DI: Ptr to DPT (or Null if foreign drive)
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34 | ; SS:BP: Ptr to IDEPACK
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35 | ; Returns with INTPACK:
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36 | ; AH: Int 13h return status (from drive requested in DL)
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37 | ; CF: 0 if successful, 1 if error
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38 | ;--------------------------------------------------------------------
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39 | AH0h_HandlerForDiskControllerReset:
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40 | ; Reset foreign Floppy and Hard Drives (those handled by other BIOSes)
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41 | eMOVZX bx, dl ; Copy requested drive to BL and zero BH to assume no errors
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42 |
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43 | xor ah, ah ; Disk Controller Reset
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44 | call Int13h_CallPreviousInt13hHandler ; Reset floppy drives only or floppy drives and foreign hard disks
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45 | call BackupErrorCodeFromTheRequestedDriveToBH
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46 |
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47 | %ifdef MODULE_SERIAL_FLOPPY
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48 | ;
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49 | ; "Reset" emulated serial floppy drives, if any. There is nothing to actually do for this reset,
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50 | ; but record the proper error return code if one of these floppy drives is the drive requested.
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51 | ;
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52 | call RamVars_UnpackFlopCntAndFirstToAL
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53 | cbw ; Clears AH (there are flop drives) or ffh (there are not)
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54 | ; Either AH has success code (flop drives are present)
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55 | ; or it doesn't matter because we won't match drive ffh
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56 |
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57 | cwd ; clears DX (there are flop drives) or ffffh (there are not)
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58 |
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59 | adc dl, al ; second drive (CF set) if present
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60 | ; If no drive is present, this will result in ffh which
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61 | ; won't match a drive
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62 | call BackupErrorCodeFromTheRequestedDriveToBH
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63 | mov dl, al ; We may end up doing the first drive twice (if there is
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64 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful.
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65 | %endif
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66 | test bl, bl ; If we were called with a floppy disk, then we are done,
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67 | jns SHORT .SkipHardDiskReset ; don't do hard disks.
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68 |
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69 | ; Resetting our hard disks will modify dl and bl to be idevars offset based instead of drive number based,
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70 | ; such that this call must be the last in the list of reset routines called.
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71 | ;
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72 | ; This needs to happen after ResetForeignDrives, as that call may have set the error code for 80h,
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73 | ; and we need to override that value if we are xlate'd into 80h with one of our drives.
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74 | ;
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75 | call ResetHardDisksHandledByOurBIOS
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76 |
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77 | .SkipHardDiskReset:
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78 | mov ah, bh
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79 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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80 |
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81 |
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82 | ;--------------------------------------------------------------------
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83 | ; BackupErrorCodeFromTheRequestedDriveToBH
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84 | ; Parameters:
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85 | ; AH: Error code from the last resetted drive
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86 | ; DL: Drive last resetted
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87 | ; BL: Requested drive (DL when entering AH=00h)
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88 | ; Returns:
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89 | ; BH: Backuped error code
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90 | ; Corrupts registers:
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91 | ; Nothing
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92 | ;--------------------------------------------------------------------
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93 | BackupErrorCodeFromTheRequestedDriveToBH:
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94 | cmp dl, bl ; Requested drive?
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95 | eCMOVE bh, ah
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96 | ret
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97 |
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98 |
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99 |
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100 | ; This defines what is called when resetting our drives at the end of drive detection.
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101 | AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization equ ResetHardDisksHandledByOurBIOS.ErrorCodeNotUsed
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102 |
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103 | ;--------------------------------------------------------------------
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104 | ; ResetHardDisksHandledByOurBIOS
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105 | ; Parameters:
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106 | ; BL: Requested drive (DL when entering AH=00h)
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107 | ; DS:DI: Ptr to DPT for requested drive
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108 | ; If DPT pointer is not available, or error result in BH won't be used anyway,
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109 | ; enter through .ErrorCodeNotUsed.
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110 | ; SS:BP: Ptr to IDEPACK
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111 | ; Returns:
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112 | ; BH: Error code from requested drive (if available)
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113 | ; Corrupts registers:
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114 | ; AX, BX, CX, DX, SI, DI
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115 | ;--------------------------------------------------------------------
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116 | ResetHardDisksHandledByOurBIOS:
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117 | xor bl, bl ; Assume Null IdevarsOffset for now, assuming foreign drive
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118 | test di, di
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119 | jz SHORT .ErrorCodeNotUsed
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120 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl
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121 | .ErrorCodeNotUsed:
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122 |
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123 | mov si, ControllerResetForDPTinDSDI
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124 | call .CallSIforEveryController ; Reset all drives to power on settings
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125 | mov si, ControllerInitForMasterOrSingleDPTinDSDI
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126 | ; Fall to .CallSIforEveryController ; Initialize all controllers (Master and Slave drives)
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127 |
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128 | .CallSIforEveryController: ; BH will be garbage on exit if this entry point is used,
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129 | ; but reset of all drives will still happen
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130 |
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131 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset
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132 |
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133 | ; Get count of ALL Idevars structures, not just the ones that are configured. This may seem odd,
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134 | ; but it catches the .ideVarsSerialAuto structure, which would not be scanned if the count from
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135 | ; RamVars_GetIdeControllerCountToCX was used. Unused controllers won't make a difference, since no DPT
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136 | ; will point to them. Performance isn't an issue, as this is a reset operation.
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137 | ;
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138 | mov cx, NUMBER_OF_IDEVARS
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139 |
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140 | .loop:
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141 | push si
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142 | call FindDPT_ForIdevarsOffsetInDL ; look for the first drive on this controller, if any
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143 | pop si
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144 | jc SHORT .notFound
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145 |
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146 | push bx
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147 | push cx
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148 | push dx
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149 | call si ; Reset Master AND Slave or initialize Master OR Slave drive
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150 | pop dx
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151 | pop cx
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152 | pop bx
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153 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry
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154 |
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155 | .notFound:
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156 | add dl, IDEVARS_size ; move Idevars pointer forward
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157 | loop .loop
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158 | ret
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159 |
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160 |
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161 | ;--------------------------------------------------------------------
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162 | ; ControllerResetForDPTinDSDI
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163 | ; Parameters:
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164 | ; DS:DI: Ptr to DPT for drive to reset (resets both Master and Slave drive)
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165 | ; SS:BP: Ptr to IDEPACK
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166 | ; Returns:
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167 | ; AH: Int 13h return status
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168 | ; Corrupts registers:
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169 | ; AL, BX, CX, DX
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170 | ;--------------------------------------------------------------------
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171 | ControllerResetForDPTinDSDI:
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172 | %ifdef MODULE_IRQ
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173 | call Interrupts_UnmaskInterruptControllerForDriveInDSDI
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174 | %endif
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175 | %ifdef MODULE_ADVANCED_ATA
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176 | call Device_ResetMasterAndSlaveController
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177 | jmp AdvAtaInit_InitializeControllerForDPTinDSDI
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178 | %else
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179 | jmp Device_ResetMasterAndSlaveController
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180 | %endif
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181 |
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182 |
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183 | ;--------------------------------------------------------------------
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184 | ; ControllerInitForMasterOrSingleDPTinDSDI
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185 | ; Parameters:
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186 | ; DS:DI: Ptr to DPT for Master or Single Drive (initializes both Master and Slave drive)
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187 | ; SS:BP: Ptr to IDEPACK
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188 | ; Returns:
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189 | ; AH: Int 13h return status
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190 | ; Corrupts registers:
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191 | ; AL, BX, CX, DX
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192 | ;--------------------------------------------------------------------
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193 | ControllerInitForMasterOrSingleDPTinDSDI:
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194 | call AH9h_InitializeDriveForUse ; Init Master or Single drive
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195 | push ax ; Store error code
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196 |
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197 | eMOVZX ax, BYTE [di+DPT.bIdevarsOffset] ; Clear AH
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198 | add di, BYTE LARGEST_DPT_SIZE ; Slave drive or next controller
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199 | cmp [di+DPT.bIdevarsOffset], al
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200 | jne SHORT .NoSlaveDrivePresent
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201 |
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202 | call AH9h_InitializeDriveForUse ; Init Slave drive
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203 | .NoSlaveDrivePresent:
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204 | pop bx
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205 | MAX_U ah, bh ; Return error code from either drive
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206 | ret
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