1 | ; File name : HIRQ.asm
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2 | ; Project name : IDE BIOS
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3 | ; Created date : 11.12.2009
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4 | ; Last update : 23.8.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : Interrupt handling related functions.
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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 | ; Wait for IRQ.
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13 | ;
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14 | ; HIRQ_WaitIRQ
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15 | ; Parameters:
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16 | ; DS: RAMVARS segment
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17 | ; Returns:
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18 | ; AH: BIOS Error code
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19 | ; CF: Cleared if wait succesfull
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20 | ; Set if any error
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21 | ; Corrupts registers:
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22 | ; AL
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23 | ;--------------------------------------------------------------------
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24 | ALIGN JUMP_ALIGN
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25 | HIRQ_WaitIRQ:
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26 | push es
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27 |
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28 | LOAD_BDA_SEGMENT_TO es, ax
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29 | %ifdef USE_AT ; OS hook only available on AT+ machines
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30 | call .NotifyOperatingSystemAboutWaitingForIRQ
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31 | cmc
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32 | jnc SHORT .TaskFlagPollingComplete
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33 | %endif
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34 | call .WaitUntilTaskFlagIsSet ; Process errors
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35 |
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36 | ALIGN JUMP_ALIGN
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37 | .TaskFlagPollingComplete:
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38 | pop es
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39 | jmp HError_ProcessErrorsAfterPollingTaskFlag
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40 |
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41 |
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42 | ;--------------------------------------------------------------------
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43 | ; .NotifyOperatingSystemAboutWaitingForIRQ
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44 | ; Parameters:
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45 | ; ES: BDA segment (zero)
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46 | ; Returns:
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47 | ; CF: Set if wait done by operating system
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48 | ; Cleared if BIOS must perform task flag polling
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49 | ; Corrupts registers:
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50 | ; AX
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51 | ;--------------------------------------------------------------------
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52 | %ifdef USE_AT
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53 | ALIGN JUMP_ALIGN
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54 | .NotifyOperatingSystemAboutWaitingForIRQ:
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55 | cli ; Disable interrupts
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56 | xor ax, ax
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57 | cmp al, [es:BDA.bHDTaskFlg] ; Task flag already set?
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58 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
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59 |
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60 | mov ah, 90h ; Hard disk busy (AX=9000h)
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61 | int INTV_SYSTEM_SERVICES ; OS hook, device busy
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62 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
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63 |
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64 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
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65 | test ah, ah ; OS hook supported? (clears CF)
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66 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
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67 | stc ; Set CF since wait done by OS
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68 | .ReturnFromWaitNotify:
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69 | sti ; Enable interrupts
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70 | ret
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71 | %endif
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72 |
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73 | ;--------------------------------------------------------------------
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74 | ; Polls IRQ Task Flag until it has been set or timeout.
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75 | ;
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76 | ; .WaitUntilTaskFlagIsSet
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77 | ; Parameters:
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78 | ; DS: RAMVARS segment
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79 | ; ES: BDA segment
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80 | ; Returns:
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81 | ; CF: Set if timeout
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82 | ; Cleared if Task Flag set
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83 | ; Corrupts registers:
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84 | ; AX
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85 | ;--------------------------------------------------------------------
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86 | ALIGN JUMP_ALIGN
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87 | .WaitUntilTaskFlagIsSet:
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88 | push cx
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89 |
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90 | mov cl, B_TIMEOUT_DRQ ; Load timeout ticks
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91 | call SoftDelay_InitTimeout ; Initialize timeout counter
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92 | xor ax, ax ; Zero AX
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93 | ALIGN JUMP_ALIGN
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94 | .PollIrqFlag:
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95 | cli ; Disable interrupt until next HLT
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96 | cmp [es:BDA.bHDTaskFlg], al ; Task flag set? (clears CF)
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97 | jne SHORT .Return
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98 | call SoftDelay_UpdTimeout ; Update timeout
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99 | jc SHORT .Return ; Return if timeout
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100 | sti ; Enable interrupts (STI has delay so HLT will catch all interrupts)
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101 | hlt ; Sleep until any interrupt
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102 | jmp SHORT .PollIrqFlag ; Jump to check if IDE interrupt
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103 | ALIGN JUMP_ALIGN
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104 | .Return:
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105 | pop cx
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106 | sti
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107 | ret
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108 |
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109 |
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110 | ;--------------------------------------------------------------------
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111 | ; Clears task (interrupt) flag from BIOS Data Area.
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112 | ;
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113 | ; HIRQ_ClearTaskFlag
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114 | ; Parameters:
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115 | ; Nothing
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116 | ; Returns:
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117 | ; Nothing
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118 | ; Corrupts registers:
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119 | ; AX
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120 | ;--------------------------------------------------------------------
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121 | ALIGN JUMP_ALIGN
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122 | HIRQ_ClearTaskFlag:
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123 | push ds
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124 | LOAD_BDA_SEGMENT_TO ds, ax ; Also zero AX
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125 | mov [BDA.bHDTaskFlg], al
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126 | pop ds
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127 | ret
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128 |
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129 |
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130 | ;--------------------------------------------------------------------
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131 | ; IDE Interrupt Service Routines.
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132 | ;
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133 | ; HIRQ_InterruptServiceRoutineForIrqs2to7
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134 | ; HIRQ_InterruptServiceRoutineForIrqs8to15
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135 | ; Parameters:
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136 | ; Nothing
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137 | ; Returns:
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138 | ; Nothing
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139 | ; Corrupts registers:
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140 | ; Nothing
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141 | ;--------------------------------------------------------------------
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142 | ALIGN JUMP_ALIGN
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143 | HIRQ_InterruptServiceRoutineForIrqs2to7:
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144 | push ax
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145 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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146 |
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147 | mov al, CMD_END_OF_INTERRUPT
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148 | jmp SHORT AcknowledgeMasterInterruptController
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149 |
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150 | ALIGN JUMP_ALIGN
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151 | HIRQ_InterruptServiceRoutineForIrqs8to15:
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152 | push ax
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153 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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154 |
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155 | mov al, CMD_END_OF_INTERRUPT ; Load EOI command to AL
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156 | out WPORT_8259SL_COMMAND, al ; Acknowledge Slave 8259
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157 | AcknowledgeMasterInterruptController:
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158 | out WPORT_8259MA_COMMAND, al ; Acknowledge Master 8259
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159 |
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160 | %ifdef USE_AT ; OS hook only available on AT+ machines
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161 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
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162 | mov ax, 9100h ; Interrupt ready, device 0 (HD)
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163 | int INTV_SYSTEM_SERVICES
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164 | %endif
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165 |
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166 | pop ax ; Restore AX
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167 | iret
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168 |
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169 | ;--------------------------------------------------------------------
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170 | ; Acknowledges IDE interrupt by reading status register and
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171 | ; stores Status and Error Registers to BDA. Task flag in BDA will
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172 | ; also be set.
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173 | ;
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174 | ; AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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175 | ; Parameters:
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176 | ; Nothing
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177 | ; Returns:
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178 | ; Nothing
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179 | ; Corrupts registers:
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180 | ; AX
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181 | ;--------------------------------------------------------------------
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182 | ALIGN JUMP_ALIGN
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183 | AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA:
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184 | push ds
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185 | push di
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186 | push dx
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187 |
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188 | ; Reading Status Register acknowledges IDE interrupt
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189 | ;call RamVars_GetSegmentToDS
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190 | ;call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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191 | LOAD_BDA_SEGMENT_TO ds, ax
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192 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
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193 |
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194 | pop dx
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195 | pop di
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196 | pop ds
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197 | ret
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