| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Interrupt handling related functions.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; HIRQ_WaitForIRQ
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| 9 | ; Parameters:
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| 10 | ; DS:BX: Ptr to DPT
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| 11 | ; Returns:
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| 12 | ; CF: Set if wait done by operating system
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| 13 | ; Cleared if BIOS must perform task flag polling
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| 14 | ; Corrupts registers:
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| 15 | ; AX
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| 16 | ;--------------------------------------------------------------------
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| 17 | ALIGN JUMP_ALIGN
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| 18 | HIRQ_WaitForIRQ:
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| 19 | test BYTE [bx+DPT.bDrvCtrl], FLG_IDE_CTRL_nIEN ; Clears CF
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| 20 | jz SHORT .NotifyOperatingSystemAboutWaitingForIRQ
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| 21 | ret ; Go to poll status register
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; .NotifyOperatingSystemAboutWaitingForIRQ
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| 25 | ; Parameters:
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| 26 | ; Nothing
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| 27 | ; Returns:
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| 28 | ; CF: Set if wait done by operating system
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| 29 | ; Cleared if BIOS must perform task flag polling
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| 30 | ; Corrupts registers:
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| 31 | ; AX
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| 32 | ;--------------------------------------------------------------------
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| 33 | ALIGN JUMP_ALIGN
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| 34 | .NotifyOperatingSystemAboutWaitingForIRQ:
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| 35 | push ds
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| 36 |
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| 37 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX
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| 38 | mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h)
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| 39 | cli ; Disable interrupts
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| 40 | cmp al, [BDA.bHDTaskFlg] ; Task flag already set?
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| 41 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
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| 42 | int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy
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| 43 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
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| 44 |
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| 45 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
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| 46 | test ah, ah ; OS hook supported? (clears CF)
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| 47 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
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| 48 | stc ; Set CF since wait done by OS
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| 49 | .ReturnFromWaitNotify:
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| 50 | pop ds
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| 51 | sti ; Enable interrupts
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| 52 | ret
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| 53 |
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| 54 |
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| 55 | ;--------------------------------------------------------------------
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| 56 | ; Clears task (interrupt) flag from BIOS Data Area.
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| 57 | ;
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| 58 | ; HIRQ_ClearTaskFlag
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| 59 | ; Parameters:
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| 60 | ; Nothing
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| 61 | ; Returns:
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| 62 | ; Nothing
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| 63 | ; Corrupts registers:
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| 64 | ; AX
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| 65 | ;--------------------------------------------------------------------
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| 66 | ALIGN JUMP_ALIGN
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| 67 | HIRQ_ClearTaskFlag:
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| 68 | push ds
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| 69 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Also zero AX
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| 70 | mov [BDA.bHDTaskFlg], al
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| 71 | pop ds
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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 | ; IDE Interrupt Service Routines.
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| 77 | ;
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| 78 | ; HIRQ_InterruptServiceRoutineForIrqs2to7
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| 79 | ; HIRQ_InterruptServiceRoutineForIrqs8to15
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| 80 | ; Parameters:
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| 81 | ; Nothing
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| 82 | ; Returns:
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| 83 | ; Nothing
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| 84 | ; Corrupts registers:
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| 85 | ; Nothing
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| 86 | ;--------------------------------------------------------------------
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| 87 | ALIGN JUMP_ALIGN
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| 88 | HIRQ_InterruptServiceRoutineForIrqs2to7:
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| 89 | push ax
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| 90 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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| 91 |
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| 92 | mov al, CMD_END_OF_INTERRUPT
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| 93 | jmp SHORT AcknowledgeMasterInterruptController
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| 94 |
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| 95 |
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| 96 | ALIGN JUMP_ALIGN
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| 97 | HIRQ_InterruptServiceRoutineForIrqs8to15:
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| 98 | push ax
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| 99 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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| 100 |
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| 101 | mov al, CMD_END_OF_INTERRUPT ; Load EOI command to AL
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| 102 | out WPORT_8259SL_COMMAND, al ; Acknowledge Slave 8259
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| 103 | AcknowledgeMasterInterruptController:
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| 104 | out WPORT_8259MA_COMMAND, al ; Acknowledge Master 8259
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| 105 |
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| 106 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
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| 107 | mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD)
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| 108 | int BIOS_SYSTEM_INTERRUPT_15h
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| 109 |
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| 110 | pop ax ; Restore AX
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| 111 | iret
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| 112 |
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| 113 | ;--------------------------------------------------------------------
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| 114 | ; Acknowledges IDE interrupt by reading status register and
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| 115 | ; stores Status and Error Registers to BDA. Task flag in BDA will
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| 116 | ; also be set.
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| 117 | ;
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| 118 | ; AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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| 119 | ; Parameters:
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| 120 | ; Nothing
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| 121 | ; Returns:
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| 122 | ; Nothing
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| 123 | ; Corrupts registers:
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| 124 | ; AX
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| 125 | ;--------------------------------------------------------------------
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| 126 | ALIGN JUMP_ALIGN
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| 127 | AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA:
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| 128 | push ds
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| 129 | push di
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| 130 |
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| 131 | ; Reading Status Register acknowledges IDE interrupt
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| 132 | call RamVars_GetSegmentToDS
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| 133 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 134 |
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| 135 | ; Set Task Flag
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| 136 | LOAD_BDA_SEGMENT_TO ds, ax
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| 137 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
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| 138 |
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| 139 | pop di
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| 140 | pop ds
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| 141 | ret
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