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 : 2.5.2010 |
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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 |
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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 | test dl, 80h ; Reset floppy drives only? |
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39 | jz SHORT .ResetForeignControllers |
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40 | call AH0h_ResetOurControllers |
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41 | .ResetForeignControllers: |
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42 | call AH0h_ResetFloppyAndForeignHardDiskControllers |
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43 | jmp Int13h_PopXRegsAndReturn ; Return since error |
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44 | |
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45 | |
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46 | ;-------------------------------------------------------------------- |
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47 | ; Resets all IDE controllers handled by this BIOS. |
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48 | ; |
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49 | ; AH0h_ResetOurControllers |
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50 | ; Parameters: |
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51 | ; DS: RAMVARS segment |
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52 | ; Returns: |
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53 | ; AH: Int 13h return status |
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54 | ; CF: 0 if succesfull, 1 if error |
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55 | ; Corrupts registers: |
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56 | ; AL, BX, CX, DI |
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57 | ;-------------------------------------------------------------------- |
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58 | ALIGN JUMP_ALIGN |
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59 | AH0h_ResetOurControllers: |
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60 | push dx |
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61 | mov bx, ROMVARS.ideVars0 ; Load offset to first IDEVARS |
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62 | call Initialize_GetIdeControllerCountToCX |
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63 | ALIGN JUMP_ALIGN |
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64 | .ResetLoop: |
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65 | call AH0h_ResetIdevarsController |
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66 | jc SHORT .Return |
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67 | add bx, BYTE IDEVARS_size |
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68 | loop .ResetLoop |
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69 | xor ax, ax ; Clear AH and CF since no errors |
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70 | .Return: |
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71 | pop dx |
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72 | ret |
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73 | |
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74 | |
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75 | ;-------------------------------------------------------------------- |
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76 | ; Resets master and slave drive based on either drive number. |
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77 | ; |
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78 | ; AH0h_ResetIdevarsController |
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79 | ; Parameters: |
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80 | ; CS:BX: Ptr to IDEVARS |
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81 | ; DS: RAMVARS segment |
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82 | ; Returns: |
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83 | ; AH: Int 13h return status |
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84 | ; CF: 0 if succesfull, 1 if error |
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85 | ; Corrupts registers: |
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86 | ; AL, DX, DI |
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87 | ;-------------------------------------------------------------------- |
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88 | ALIGN JUMP_ALIGN |
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89 | AH0h_ResetIdevarsController: |
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90 | mov dx, [cs:bx+IDEVARS.wPort] |
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91 | call FindDPT_ForIdeMasterAtPort ; Find master drive to DL |
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92 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries |
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93 | call FindDPT_ForIdeSlaveAtPort ; Find slave if master not present |
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94 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries |
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95 | clc |
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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 | ; Resets master and slave drive based on either drive number. |
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101 | ; |
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102 | ; AH0h_ResetMasterAndSlaveDriveWithRetries |
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103 | ; Parameters: |
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104 | ; DL: Drive number for master or slave drive |
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105 | ; Returns: |
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106 | ; AH: Int 13h return status |
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107 | ; CF: 0 if succesfull, 1 if error |
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108 | ; Corrupts registers: |
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109 | ; AL, DX, DI |
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110 | ;-------------------------------------------------------------------- |
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111 | ALIGN JUMP_ALIGN |
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112 | AH0h_ResetMasterAndSlaveDriveWithRetries: |
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113 | push cx |
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114 | push bx |
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115 | mov cx, RETRIES_IF_RESET_FAILS |
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116 | ALIGN JUMP_ALIGN |
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117 | .RetryLoop: |
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118 | mov di, cx ; Backup counter |
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119 | call AHDh_ResetDrive |
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120 | jnc SHORT .Return |
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121 | mov cx, TIMEOUT_BEFORE_RESET_RETRY |
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122 | call SoftDelay_TimerTicks |
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123 | mov cx, di |
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124 | loop .RetryLoop |
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125 | mov ah, RET_HD_RESETFAIL |
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126 | stc |
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127 | ALIGN JUMP_ALIGN |
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128 | .Return: |
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129 | pop bx |
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130 | pop cx |
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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 | ; Resets floppy drives and foreign hard disks. |
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136 | ; |
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137 | ; AH0h_ResetFloppyAndForeignHardDiskControllers |
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138 | ; Parameters: |
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139 | ; DL: Drive number (ignored so all drives are reset) |
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140 | ; If bit 7 is set all hard disks and floppy disks reset. |
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141 | ; Returns: |
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142 | ; AH: Int 13h return status |
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143 | ; CF: 0 if succesfull, 1 if error |
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144 | ; Corrupts registers: |
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145 | ; Nothing |
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146 | ;-------------------------------------------------------------------- |
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147 | ALIGN JUMP_ALIGN |
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148 | AH0h_ResetFloppyAndForeignHardDiskControllers: |
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149 | xor ah, ah ; AH=0h, Disk Controller Reset |
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150 | pushf ; Push flags to simulate INT |
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151 | cli ; Disable interrupts |
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152 | call FAR [RAMVARS.fpOldI13h] |
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153 | ret |
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