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 | ; 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 | ; Int 13h function AH=0h, Disk Controller Reset.
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9 | ;
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10 | ; AH0h_HandlerForDiskControllerReset
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11 | ; Parameters:
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12 | ; DL: Translated Drive number (ignored so all drives are reset)
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13 | ; If bit 7 is set all hard disks and floppy disks reset.
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14 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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15 | ; SS:BP: Ptr to IDEPACK
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16 | ; Returns with INTPACK:
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17 | ; AH: Int 13h return status (from drive requested in DL)
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18 | ; CF: 0 if succesfull, 1 if error
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19 | ;--------------------------------------------------------------------
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20 | ALIGN JUMP_ALIGN
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21 | AH0h_HandlerForDiskControllerReset:
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22 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
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23 | call ResetFloppyDrivesWithInt40h
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24 |
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25 | %ifdef MODULE_SERIAL_FLOPPY
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26 | ;
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27 | ; "Reset" emulatd serial floppy drives, if any. There is nothing to actually do for this reset,
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28 | ; but record the proper error return code if one of these floppy drives is the drive requested.
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29 | ;
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30 | call RamVars_UnpackFlopCntAndFirstToAL
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31 | cbw ; Clears AH (there are flop drives) or ffh (there are not)
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32 | ; Either AH has success code (flop drives are present)
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33 | ; or it doesn't matter because we won't match drive ffh
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34 |
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35 | cwd ; clears DX (there are flop drives) or ffffh (there are not)
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36 |
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37 | adc dl, al ; second drive (CF set) if present
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38 | ; If no drive is present, this will result in ffh which
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39 | ; won't match a drive
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40 | call BackupErrorCodeFromTheRequestedDriveToBH
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41 | mov dl, al ; We may end up doing the first drive twice (if there is
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42 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful.
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43 | %endif
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44 |
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45 | test bl, bl ; If we were called with a floppy disk, then we are done,
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46 | jns SHORT .SkipHardDiskReset ; don't do hard disks.
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47 |
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48 | call ResetForeignHardDisks
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49 |
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50 | ; Resetting our hard disks will modify dl and bl such that this call must be the last in the list
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51 | ;
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52 | call AH0h_ResetHardDisksHandledByOurBIOS
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53 |
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54 | .SkipHardDiskReset:
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55 | mov ah, bh
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56 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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57 |
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58 |
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59 | ;--------------------------------------------------------------------
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60 | ; ResetFloppyDrivesWithInt40h
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61 | ; Parameters:
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62 | ; BL: Requested drive (DL when entering AH=00h)
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63 | ; Returns:
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64 | ; BH: Error code from requested drive (if available)
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65 | ; Corrupts registers:
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66 | ; AX, DL, DI
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67 | ;--------------------------------------------------------------------
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68 | ALIGN JUMP_ALIGN
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69 | ResetFloppyDrivesWithInt40h:
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70 | call GetDriveNumberForForeignBiosesToDL
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71 | and dl, 7Fh ; Clear hard disk bit
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72 | xor ah, ah ; Disk Controller Reset
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73 | int BIOS_DISKETTE_INTERRUPT_40h
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74 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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75 |
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76 |
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77 | ;--------------------------------------------------------------------
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78 | ; ResetForeignHardDisks
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79 | ; Parameters:
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80 | ; BL: Requested drive (DL when entering AH=00h)
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81 | ; DS: RAMVARS segment
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82 | ; Returns:
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83 | ; BH: Error code from requested drive (if available)
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84 | ; Corrupts registers:
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85 | ; AX, DL, DI
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86 | ;--------------------------------------------------------------------
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87 | ALIGN JUMP_ALIGN
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88 | ResetForeignHardDisks:
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89 | call GetDriveNumberForForeignBiosesToDL
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90 | xor ah, ah ; Disk Controller Reset
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91 | call Int13h_CallPreviousInt13hHandler
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92 | ;;; fall-through to BackupErrorCodeFromTheRequestedDriveToBH
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93 |
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94 |
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95 | ;--------------------------------------------------------------------
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96 | ; BackupErrorCodeFromTheRequestedDriveToBH
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97 | ; Parameters:
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98 | ; AH: Error code from the last resetted drive
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99 | ; DL: Drive last resetted
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100 | ; BL: Requested drive (DL when entering AH=00h)
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101 | ; Returns:
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102 | ; BH: Backuped error code
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103 | ; Corrupts registers:
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104 | ; Nothing
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105 | ;--------------------------------------------------------------------
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106 | ALIGN JUMP_ALIGN
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107 | BackupErrorCodeFromTheRequestedDriveToBH:
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108 | cmp dl, bl ; Requested drive?
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109 | eCMOVE bh, ah
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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 | ; GetDriveNumberForForeignBiosesToDL
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115 | ; Parameters:
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116 | ; BL: Requested drive (DL when entering AH=00h)
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117 | ; DS: RAMVARS segment
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118 | ; Returns:
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119 | ; DL: BL if foreign drive
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120 | ; 80h if our drive
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121 | ; Corrupts registers:
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122 | ; DI
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123 | ;--------------------------------------------------------------------
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124 | ALIGN JUMP_ALIGN
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125 | GetDriveNumberForForeignBiosesToDL:
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126 | mov dl, bl
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127 | test di, di
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128 | jz SHORT .Return ; Return what was in BL unmodified
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129 | mov dl, 80h
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130 | .Return:
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131 | ret
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132 |
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133 |
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134 | ;--------------------------------------------------------------------
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135 | ; AH0h_ResetHardDisksHandledByOurBIOS
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136 | ; Parameters:
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137 | ; BL: Requested drive (DL when entering AH=00h)
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138 | ; DS: RAMVARS segment
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139 | ; SS:BP: Ptr to IDEPACK
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140 | ; Returns:
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141 | ; BH: Error code from requested drive (if available)
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142 | ; Corrupts registers:
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143 | ; AX, CX, DX, SI, DI
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144 | ;--------------------------------------------------------------------
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145 | ALIGN JUMP_ALIGN
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146 | AH0h_ResetHardDisksHandledByOurBIOS:
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147 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl
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148 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset
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149 |
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150 | call RamVars_GetIdeControllerCountToCX
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151 | jcxz .done ; just in case bIdeCnt is zero (shouldn't be)
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152 |
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153 | mov si, IterateFindFirstDPTforIdevars ; iteration routine (see below)
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154 |
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155 | .loop:
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156 | call IterateAllDPTs ; look for the first drive on this controller, if any
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157 | jc .notFound
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158 |
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159 | call AHDh_ResetDrive ; reset master and slave on that controller
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160 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry
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161 |
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162 | .notFound:
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163 | add dl, IDEVARS_size ; move Idevars pointer forward
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164 | loop .loop
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165 |
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166 | .done:
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167 | ret
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168 |
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169 | ;--------------------------------------------------------------------
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170 | ; Iteration routine for AH0h_ResetHardDisksHandledByOurBIOS,
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171 | ; for use with IterateAllDPTs
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172 | ;
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173 | ; Returns when DPT is found on the controller with Idevars offset in DL
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174 | ;--------------------------------------------------------------------
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175 | IterateFindFirstDPTforIdevars:
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176 | cmp dl, [di+DPT.bIdevarsOffset] ; Clears CF if matched
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177 | jz .done
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178 | stc ; Set CF for not found
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179 | .done:
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180 | ret
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