1 | ; File name : AHDh_HReset.asm
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2 | ; Project name : IDE BIOS
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3 | ; Created date : 9.12.2007
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4 | ; Last update : 28.7.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
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7 |
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8 | ; Section containing code
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9 | SECTION .text
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10 |
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11 | ;--------------------------------------------------------------------
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12 | ; Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
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13 | ;
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14 | ; AHDh_HandlerForResetHardDisk
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15 | ; Parameters:
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16 | ; AH: Bios function Dh
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17 | ; DL: Drive number
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18 | ; Returns:
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19 | ; AH: Int 13h return status
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20 | ; CF: 0 if succesfull, 1 if error
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21 | ; IF: 1
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22 | ; Corrupts registers:
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23 | ; Flags
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24 | ;--------------------------------------------------------------------
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25 | ALIGN JUMP_ALIGN
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26 | AHDh_HandlerForResetHardDisk:
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27 | call AHDh_ResetDrive
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28 | jmp Int13h_PopDiDsAndReturn
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29 |
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30 |
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31 | ;--------------------------------------------------------------------
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32 | ; Resets hard disk.
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33 | ;
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34 | ; AHDh_ResetDrive
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35 | ; Parameters:
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36 | ; DL: Drive number
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37 | ; DS: RAMVARS segment
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38 | ; Returns:
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39 | ; AH: Int 13h return status
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40 | ; CF: 0 if succesfull, 1 if error
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41 | ; Corrupts registers:
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42 | ; DI
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43 | ;--------------------------------------------------------------------
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44 | ALIGN JUMP_ALIGN
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45 | AHDh_ResetDrive:
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46 | push dx
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47 | push cx
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48 | push bx
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49 | push ax
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50 |
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51 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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52 | call AHDh_ResetMasterAndSlave
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53 | ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
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54 | ; (error register has special values after reset)
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55 |
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56 | ; Initialize Master and Slave drives
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57 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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58 | call AHDh_InitializeMasterAndSlave
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59 |
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60 | pop bx ; Pop old AX
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61 | mov al, bl ; Restore AL
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62 | pop bx
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63 | pop cx
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64 | pop dx
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65 | ret
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66 |
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67 |
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68 | ;--------------------------------------------------------------------
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69 | ; Resets Master and Slave drives at wanted port.
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70 | ; Both IDE drives will be reset. It is not possible to reset
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71 | ; Master or Slave only.
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72 | ;
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73 | ; AHDh_ResetMasterAndSlave
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74 | ; Parameters:
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75 | ; DS:DI: Ptr to DPT for Master or Slave drive
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76 | ; Returns:
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77 | ; CF: 0 if reset succesfull
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78 | ; 1 if any error
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79 | ; Corrupts registers:
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80 | ; AX, BX, CX, DX
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81 | ;--------------------------------------------------------------------
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82 | ALIGN JUMP_ALIGN
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83 | AHDh_ResetMasterAndSlave:
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84 | ; Reset controller
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85 | ; HSR0: Set_SRST
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86 | mov al, [di+DPT.bDrvCtrl] ; Load value for ACR
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87 | or al, FLG_IDE_CTRL_SRST ; Set Reset bit
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88 | call HDrvSel_OutputDeviceControlByte
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89 | mov cx, 5 ; Delay at least 5us
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90 | call SoftDelay_us
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91 |
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92 | ; HSR1: Clear_wait
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93 | and al, ~FLG_IDE_CTRL_SRST ; Clear Reset bit
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94 | out dx, al ; End Reset
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95 | mov cx, 2000 ; Delay at least 2ms
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96 | call SoftDelay_us
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97 |
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98 | ; HSR2: Check_status
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99 | mov cl, B_TIMEOUT_RESET ; Reset timeout delay
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100 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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101 | jmp HStatus_WaitBsyBase
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102 |
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103 |
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104 | ;--------------------------------------------------------------------
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105 | ; Initializes Master and Slave drive.
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106 | ;
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107 | ; AHDh_InitializeMasterAndSlave
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108 | ; Parameters:
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109 | ; DX: IDE Base Port address
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110 | ; Returns:
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111 | ; AH: Error code
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112 | ; CF: 0 if initialization succesfull
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113 | ; 1 if any error
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114 | ; Corrupts registers:
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115 | ; AL, BX, CX, DX, DI
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116 | ;--------------------------------------------------------------------
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117 | ALIGN JUMP_ALIGN
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118 | AHDh_InitializeMasterAndSlave:
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119 | push dx ; Store base port address
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120 | xor cx, cx ; Assume no errors
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121 | call FindDPT_ForIdeMasterAtPort
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122 | jnc SHORT .InitializeSlave ; Master drive not present
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123 | call AH9h_InitializeDriveForUse
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124 | mov cl, ah ; Copy error code to CL
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125 | ALIGN JUMP_ALIGN
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126 | .InitializeSlave:
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127 | pop dx ; Restore base port address
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128 | call FindDPT_ForIdeSlaveAtPort
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129 | jnc SHORT .CombineErrors ; Slave drive not present
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130 | call AH9h_InitializeDriveForUse
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131 | mov ch, ah ; Copy error code to CH
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132 | ALIGN JUMP_ALIGN
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133 | .CombineErrors:
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134 | or cl, ch ; OR error codes, clear CF
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135 | jnz SHORT .ReturnError
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136 | ret
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137 | .ReturnError:
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138 | mov ah, RET_HD_RESETFAIL ; Load Reset Failed error code
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139 | stc
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140 | ret
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