| 1 | ; Project name : IDE BIOS
|
|---|
| 2 | ; Description : Interrupt handling related functions.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; HIRQ_WaitForIRQ
|
|---|
| 9 | ; Parameters:
|
|---|
| 10 | ; DS: RAMVARS segment
|
|---|
| 11 | ; Returns:
|
|---|
| 12 | ; CF: Set if wait done by operating system
|
|---|
| 13 | ; Cleared if BIOS must perform task flag polling
|
|---|
| 14 | ; Corrupts registers:
|
|---|
| 15 | ; AX
|
|---|
| 16 | ;--------------------------------------------------------------------
|
|---|
| 17 | ALIGN JUMP_ALIGN
|
|---|
| 18 | HIRQ_WaitForIRQ:
|
|---|
| 19 | test BYTE [bx+DPT.bDrvCtrl], FLG_IDE_CTRL_nIEN ; Clears CF
|
|---|
| 20 | jz SHORT .NotifyOperatingSystemAboutWaitingForIRQ
|
|---|
| 21 | ret ; Go to poll status register
|
|---|
| 22 |
|
|---|
| 23 | ;--------------------------------------------------------------------
|
|---|
| 24 | ; .NotifyOperatingSystemAboutWaitingForIRQ
|
|---|
| 25 | ; Parameters:
|
|---|
| 26 | ; Nothing
|
|---|
| 27 | ; Returns:
|
|---|
| 28 | ; CF: Set if wait done by operating system
|
|---|
| 29 | ; Cleared if BIOS must perform task flag polling
|
|---|
| 30 | ; Corrupts registers:
|
|---|
| 31 | ; AX
|
|---|
| 32 | ;--------------------------------------------------------------------
|
|---|
| 33 | ALIGN JUMP_ALIGN
|
|---|
| 34 | .NotifyOperatingSystemAboutWaitingForIRQ:
|
|---|
| 35 | push ds
|
|---|
| 36 |
|
|---|
| 37 | LOAD_BDA_SEGMENT_TO ds, ax ; Zero AX
|
|---|
| 38 | cli ; Disable interrupts
|
|---|
| 39 | cmp al, [BDA.bHDTaskFlg] ; Task flag already set?
|
|---|
| 40 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
|
|---|
| 41 |
|
|---|
| 42 | mov ah, 90h ; Hard disk busy (AX=9000h)
|
|---|
| 43 | int INTV_SYSTEM_SERVICES ; OS hook, device busy
|
|---|
| 44 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
|
|---|
| 45 |
|
|---|
| 46 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
|
|---|
| 47 | test ah, ah ; OS hook supported? (clears CF)
|
|---|
| 48 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
|
|---|
| 49 | stc ; Set CF since wait done by OS
|
|---|
| 50 | .ReturnFromWaitNotify:
|
|---|
| 51 | pop ds
|
|---|
| 52 | sti ; Enable interrupts
|
|---|
| 53 | ret
|
|---|
| 54 |
|
|---|
| 55 |
|
|---|
| 56 | ;--------------------------------------------------------------------
|
|---|
| 57 | ; Clears task (interrupt) flag from BIOS Data Area.
|
|---|
| 58 | ;
|
|---|
| 59 | ; HIRQ_ClearTaskFlag
|
|---|
| 60 | ; Parameters:
|
|---|
| 61 | ; Nothing
|
|---|
| 62 | ; Returns:
|
|---|
| 63 | ; Nothing
|
|---|
| 64 | ; Corrupts registers:
|
|---|
| 65 | ; AX
|
|---|
| 66 | ;--------------------------------------------------------------------
|
|---|
| 67 | ALIGN JUMP_ALIGN
|
|---|
| 68 | HIRQ_ClearTaskFlag:
|
|---|
| 69 | push ds
|
|---|
| 70 | LOAD_BDA_SEGMENT_TO ds, ax ; Also zero AX
|
|---|
| 71 | mov [BDA.bHDTaskFlg], al
|
|---|
| 72 | pop ds
|
|---|
| 73 | ret
|
|---|
| 74 |
|
|---|
| 75 |
|
|---|
| 76 | ;--------------------------------------------------------------------
|
|---|
| 77 | ; IDE Interrupt Service Routines.
|
|---|
| 78 | ;
|
|---|
| 79 | ; HIRQ_InterruptServiceRoutineForIrqs2to7
|
|---|
| 80 | ; HIRQ_InterruptServiceRoutineForIrqs8to15
|
|---|
| 81 | ; Parameters:
|
|---|
| 82 | ; Nothing
|
|---|
| 83 | ; Returns:
|
|---|
| 84 | ; Nothing
|
|---|
| 85 | ; Corrupts registers:
|
|---|
| 86 | ; Nothing
|
|---|
| 87 | ;--------------------------------------------------------------------
|
|---|
| 88 | ALIGN JUMP_ALIGN
|
|---|
| 89 | HIRQ_InterruptServiceRoutineForIrqs2to7:
|
|---|
| 90 | push ax
|
|---|
| 91 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
|
|---|
| 92 |
|
|---|
| 93 | mov al, CMD_END_OF_INTERRUPT
|
|---|
| 94 | jmp SHORT AcknowledgeMasterInterruptController
|
|---|
| 95 |
|
|---|
| 96 |
|
|---|
| 97 | ALIGN JUMP_ALIGN
|
|---|
| 98 | HIRQ_InterruptServiceRoutineForIrqs8to15:
|
|---|
| 99 | push ax
|
|---|
| 100 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
|
|---|
| 101 |
|
|---|
| 102 | mov al, CMD_END_OF_INTERRUPT ; Load EOI command to AL
|
|---|
| 103 | out WPORT_8259SL_COMMAND, al ; Acknowledge Slave 8259
|
|---|
| 104 | AcknowledgeMasterInterruptController:
|
|---|
| 105 | out WPORT_8259MA_COMMAND, al ; Acknowledge Master 8259
|
|---|
| 106 |
|
|---|
| 107 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
|
|---|
| 108 | mov ax, 9100h ; Interrupt ready, device 0 (HD)
|
|---|
| 109 | int INTV_SYSTEM_SERVICES
|
|---|
| 110 |
|
|---|
| 111 | pop ax ; Restore AX
|
|---|
| 112 | iret
|
|---|
| 113 |
|
|---|
| 114 | ;--------------------------------------------------------------------
|
|---|
| 115 | ; Acknowledges IDE interrupt by reading status register and
|
|---|
| 116 | ; stores Status and Error Registers to BDA. Task flag in BDA will
|
|---|
| 117 | ; also be set.
|
|---|
| 118 | ;
|
|---|
| 119 | ; AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
|
|---|
| 120 | ; Parameters:
|
|---|
| 121 | ; Nothing
|
|---|
| 122 | ; Returns:
|
|---|
| 123 | ; Nothing
|
|---|
| 124 | ; Corrupts registers:
|
|---|
| 125 | ; AX
|
|---|
| 126 | ;--------------------------------------------------------------------
|
|---|
| 127 | ALIGN JUMP_ALIGN
|
|---|
| 128 | AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA:
|
|---|
| 129 | push ds
|
|---|
| 130 | push di
|
|---|
| 131 |
|
|---|
| 132 | ; Reading Status Register acknowledges IDE interrupt
|
|---|
| 133 | call RamVars_GetSegmentToDS
|
|---|
| 134 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
|
|---|
| 135 |
|
|---|
| 136 | ; Set Task Flag
|
|---|
| 137 | LOAD_BDA_SEGMENT_TO ds, ax
|
|---|
| 138 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
|
|---|
| 139 |
|
|---|
| 140 | pop di
|
|---|
| 141 | pop ds
|
|---|
| 142 | ret
|
|---|
