1 | ; File name : AH0h_HReset.asm
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2 | ; Project name : IDE BIOS
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3 | ; Created date : 27.9.2007
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4 | ; Last update : 1.7.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : Int 13h function AH=0h, Disk Controller Reset.
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7 |
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8 | RETRIES_IF_RESET_FAILS EQU 3
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9 | TIMEOUT_BEFORE_RESET_RETRY EQU 5 ; System timer ticks
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10 |
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11 | ; Section containing code
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12 | SECTION .text
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13 |
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14 | ;--------------------------------------------------------------------
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15 | ; Int 13h function AH=0h, Disk Controller Reset.
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16 | ;
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17 | ; AH0h_HandlerForDiskControllerReset
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18 | ; Parameters:
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19 | ; AH: Bios function 0h
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20 | ; DL: Drive number (ignored so all drives are reset)
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21 | ; If bit 7 is set all hard disks and floppy disks reset.
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22 | ; Parameters loaded by Int13h_Jump:
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23 | ; DS: RAMVARS segment
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24 | ; Returns:
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25 | ; AH: Int 13h return status (from drive requested in DL)
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26 | ; CF: 0 if succesfull, 1 if error
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27 | ; IF: 1
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28 | ; Corrupts registers:
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29 | ; Flags
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30 | ;--------------------------------------------------------------------
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31 | ALIGN JUMP_ALIGN
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32 | AH0h_HandlerForDiskControllerReset:
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33 | push dx
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34 | push cx
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35 | push bx
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36 | push ax
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37 |
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38 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
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39 | call AH0h_ResetFloppyDrivesWithInt40h
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40 | test bl, 80h ; Reset hard disks too?
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41 | jz SHORT .Return
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42 | call AH0h_ResetForeignHardDisks
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43 | call AH0h_ResetAllOurControllers
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44 | ALIGN JUMP_ALIGN
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45 | .Return:
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46 | mov ah, bh ; Copy error code to AH
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47 | xor al, al ; Zero AL...
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48 | sub al, ah ; ...and set CF if error
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49 | jmp Int13h_PopXRegsAndReturn
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50 |
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51 |
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52 | ;--------------------------------------------------------------------
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53 | ; AH0h_ResetFloppyDrivesWithInt40h
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54 | ; Parameters:
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55 | ; BL: Requested drive (DL when entering AH=00h)
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56 | ; DL: Drive number
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57 | ; Returns:
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58 | ; BH: Error code from requested drive (if available)
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59 | ; Corrupts registers:
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60 | ; AX, DL
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61 | ;--------------------------------------------------------------------
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62 | ALIGN JUMP_ALIGN
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63 | AH0h_ResetFloppyDrivesWithInt40h:
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64 | xor ax, ax ; Disk Controller Reset
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65 | and dl, 7Fh ; Clear bit 7
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66 | int INTV_FLOPPY_FUNC
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67 | jmp SHORT AH0h_BackupErrorCodeFromTheRequestedDriveToBH
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68 |
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69 |
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70 | ;--------------------------------------------------------------------
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71 | ; AH0h_ResetForeignHardDisks
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72 | ; Parameters:
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73 | ; BL: Requested drive (DL when entering AH=00h)
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74 | ; DS: RAMVARS segment
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75 | ; Returns:
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76 | ; BH: Error code from requested drive (if available)
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77 | ; Corrupts registers:
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78 | ; AX, DL
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79 | ;--------------------------------------------------------------------
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80 | ALIGN JUMP_ALIGN
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81 | AH0h_ResetForeignHardDisks:
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82 | mov cl, [RAMVARS.bFirstDrv] ; Load number of first our drive
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83 | and cx, BYTE 7Fh ; CX = number of drives to reset
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84 | jz SHORT .Return
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85 | mov dl, 80h ; Start resetting from drive 80h
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86 | ALIGN JUMP_ALIGN
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87 | .DriveResetLoop:
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88 | mov ah, 0Dh ; Reset Hard Disk (Alternate reset)
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89 | pushf ; Push flags to simulate INT
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90 | cli ; Disable interrupts since INT does that
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91 | call FAR [RAMVARS.fpOldI13h]
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92 | sti ; Make sure interrupts are enabled again (some BIOSes fails to enable it)
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93 | call AH0h_BackupErrorCodeFromTheRequestedDriveToBH
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94 | inc dx ; Next drive to reset
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95 | loop .DriveResetLoop
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96 | ALIGN JUMP_ALIGN
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97 | .Return:
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98 | ret
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99 |
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100 |
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101 | ;--------------------------------------------------------------------
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102 | ; AH0h_ResetAllOurControllers
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103 | ; Parameters:
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104 | ; BL: Requested drive (DL when entering AH=00h)
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105 | ; DS: RAMVARS segment
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106 | ; Returns:
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107 | ; BH: Error code from requested drive (if available)
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108 | ; Corrupts registers:
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109 | ; AX, CX, DX, DI
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110 | ;--------------------------------------------------------------------
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111 | ALIGN JUMP_ALIGN
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112 | AH0h_ResetAllOurControllers:
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113 | push si
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114 | mov si, ROMVARS.ideVars0 ; Load offset to first IDEVARS
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115 | call Initialize_GetIdeControllerCountToCX
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116 | ALIGN JUMP_ALIGN
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117 | .ResetLoop:
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118 | call AH0h_ResetIdevarsControllerMasterAndSlaveDrives
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119 | add si, BYTE IDEVARS_size
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120 | loop .ResetLoop
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121 | .Return:
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122 | pop si
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123 | ret
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124 |
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125 |
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126 | ;--------------------------------------------------------------------
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127 | ; AH0h_ResetIdevarsControllerMasterAndSlaveDrives
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128 | ; Parameters:
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129 | ; BL: Requested drive (DL when entering AH=00h)
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130 | ; CS:SI: Ptr to IDEVARS
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131 | ; DS: RAMVARS segment
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132 | ; Returns:
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133 | ; BH: Error code from requested drive (if available)
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134 | ; Corrupts registers:
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135 | ; AX, DX, DI
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136 | ;--------------------------------------------------------------------
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137 | ALIGN JUMP_ALIGN
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138 | AH0h_ResetIdevarsControllerMasterAndSlaveDrives:
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139 | mov dx, [cs:si+IDEVARS.wPort]
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140 | call FindDPT_ForIdeMasterAtPort ; Find master drive to DL
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141 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries
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142 | call FindDPT_ForIdeSlaveAtPort ; Find slave if master not present
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143 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries
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144 | ret
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145 |
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146 | ;--------------------------------------------------------------------
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147 | ; AH0h_ResetMasterAndSlaveDriveWithRetries
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148 | ; Parameters:
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149 | ; BL: Requested drive (DL when entering AH=00h)
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150 | ; DL: Drive number for master or slave drive
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151 | ; DS: RAMVARS segment
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152 | ; Returns:
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153 | ; BH: Error code from requested drive (if available)
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154 | ; Corrupts registers:
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155 | ; AX, DI
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156 | ;--------------------------------------------------------------------
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157 | ALIGN JUMP_ALIGN
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158 | AH0h_ResetMasterAndSlaveDriveWithRetries:
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159 | push dx
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160 | push cx
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161 | push bx
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162 | mov di, RETRIES_IF_RESET_FAILS
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163 | ALIGN JUMP_ALIGN
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164 | .RetryLoop:
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165 | call AHDh_ResetDrive
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166 | jnc SHORT .Return ; Jump if successful
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167 | mov cx, TIMEOUT_BEFORE_RESET_RETRY
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168 | call SoftDelay_TimerTicks
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169 | dec di
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170 | jnz SHORT .RetryLoop
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171 | ALIGN JUMP_ALIGN
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172 | .Return:
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173 | pop bx
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174 | pop cx
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175 | pop dx
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176 | ; Fall to AH0h_BackupErrorCodeFromTheRequestedDriveToBH
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177 |
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178 | ;--------------------------------------------------------------------
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179 | ; AH0h_BackupErrorCodeFromTheRequestedDriveToBH
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180 | ; Parameters:
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181 | ; AH: Error code from the last resetted drive
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182 | ; DL: Drive last resetted
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183 | ; BL: Requested drive (DL when entering AH=00h)
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184 | ; Returns:
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185 | ; BH: Backuped error code
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186 | ; Corrupts registers:
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187 | ; Nothing
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188 | ;--------------------------------------------------------------------
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189 | ALIGN JUMP_ALIGN
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190 | AH0h_BackupErrorCodeFromTheRequestedDriveToBH:
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191 | cmp dl, bl ; Requested drive?
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192 | jne SHORT .Return
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193 | mov bh, ah
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194 | ALIGN JUMP_ALIGN
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195 | .Return:
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196 | ret
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