[3] | 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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[28] | 4 | ; Last update : 1.8.2010
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[3] | 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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[28] | 22 | ; AL
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[3] | 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] | 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 | call HError_ProcessErrorsAfterPollingTaskFlag
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| 39 | pop es
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| 40 | ret
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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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[3] | 55 | cli ; Disable interrupts
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[28] | 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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[3] | 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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[28] | 62 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
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[3] | 63 |
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[28] | 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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[3] | 69 | sti ; Enable interrupts
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| 70 | ret
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[28] | 71 | %endif
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[3] | 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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[28] | 76 | ; .WaitUntilTaskFlagIsSet
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[3] | 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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[28] | 81 | ; CF: Set if timeout
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| 82 | ; Cleared if Task Flag set
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[3] | 83 | ; Corrupts registers:
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[28] | 84 | ; AX
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[3] | 85 | ;--------------------------------------------------------------------
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| 86 | ALIGN JUMP_ALIGN
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[28] | 87 | .WaitUntilTaskFlagIsSet:
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| 88 | push cx
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| 89 |
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[3] | 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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[28] | 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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[3] | 98 | call SoftDelay_UpdTimeout ; Update timeout
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[28] | 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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[3] | 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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[28] | 104 | .Return:
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| 105 | pop cx
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| 106 | sti
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[3] | 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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[28] | 145 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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| 146 |
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[3] | 147 | mov al, CMD_END_OF_INTERRUPT
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[28] | 148 | jmp SHORT AcknowledgeMasterInterruptController
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[3] | 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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[28] | 153 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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[3] | 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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[28] | 157 | AcknowledgeMasterInterruptController:
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[3] | 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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[28] | 174 | ; AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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[3] | 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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[28] | 183 | AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA:
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[3] | 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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[28] | 190 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 191 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
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[3] | 192 |
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| 193 | pop dx
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| 194 | pop di
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| 195 | pop ds
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| 196 | ret
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