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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