| [150] | 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Interrupt handling related functions.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; IdeIrq_WaitForIRQ
|
|---|
| 9 | ; Parameters:
|
|---|
| 10 | ; DS:DI: Ptr to DPT (in 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 | IdeIrq_WaitForIRQ:
|
|---|
| 19 |
|
|---|
| 20 | ;--------------------------------------------------------------------
|
|---|
| 21 | ; .NotifyOperatingSystemAboutWaitingForIRQ
|
|---|
| 22 | ; Parameters:
|
|---|
| 23 | ; Nothing
|
|---|
| 24 | ; Returns:
|
|---|
| 25 | ; CF: Set if wait done by operating system
|
|---|
| 26 | ; Cleared if BIOS must perform task flag polling
|
|---|
| 27 | ; Corrupts registers:
|
|---|
| 28 | ; AX
|
|---|
| 29 | ;--------------------------------------------------------------------
|
|---|
| 30 | .NotifyOperatingSystemAboutWaitingForIRQ:
|
|---|
| 31 | push ds
|
|---|
| 32 |
|
|---|
| 33 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX
|
|---|
| 34 | mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h)
|
|---|
| 35 | cli ; Disable interrupts
|
|---|
| 36 | cmp al, [BDA.bHDTaskFlg] ; Task flag already set?
|
|---|
| 37 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
|
|---|
| 38 | int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy
|
|---|
| 39 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
|
|---|
| 40 |
|
|---|
| 41 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
|
|---|
| 42 | test ah, ah ; OS hook supported? (clears CF)
|
|---|
| 43 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
|
|---|
| 44 | stc ; Set CF since wait done by OS
|
|---|
| 45 | .ReturnFromWaitNotify:
|
|---|
| 46 | pop ds
|
|---|
| 47 | sti ; Enable interrupts
|
|---|
| 48 | ret
|
|---|
| 49 |
|
|---|
| 50 |
|
|---|
| 51 | ;--------------------------------------------------------------------
|
|---|
| 52 | ; IdeIrq_SetInServiceDPTandClearTaskFlag
|
|---|
| 53 | ; Parameters:
|
|---|
| 54 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
|---|
| 55 | ; Returns:
|
|---|
| 56 | ; Nothing
|
|---|
| 57 | ; Corrupts registers:
|
|---|
| 58 | ; AX
|
|---|
| 59 | ;--------------------------------------------------------------------
|
|---|
| 60 | ALIGN JUMP_ALIGN
|
|---|
| 61 | IdeIrq_SetInServiceDPTandClearTaskFlag:
|
|---|
| 62 | mov [RAMVARS.pInServiceDPT], di
|
|---|
| 63 | push ds
|
|---|
| 64 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Also zero AX
|
|---|
| 65 | mov [BDA.bHDTaskFlg], al
|
|---|
| 66 | pop ds
|
|---|
| 67 | ret
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | ;--------------------------------------------------------------------
|
|---|
| 71 | ; IDE Interrupt Service Routines.
|
|---|
| 72 | ;
|
|---|
| 73 | ; IdeIrq_InterruptServiceRoutineForIrqs2to7
|
|---|
| 74 | ; IdeIrq_InterruptServiceRoutineForIrqs8to15
|
|---|
| 75 | ; Parameters:
|
|---|
| 76 | ; Nothing
|
|---|
| 77 | ; Returns:
|
|---|
| 78 | ; Nothing
|
|---|
| 79 | ; Corrupts registers:
|
|---|
| 80 | ; Nothing
|
|---|
| 81 | ;--------------------------------------------------------------------
|
|---|
| 82 | ALIGN JUMP_ALIGN
|
|---|
| 83 | IdeIrq_InterruptServiceRoutineForIrqs2to7:
|
|---|
| 84 | push di
|
|---|
| 85 | push ax
|
|---|
| 86 | call AcknowledgeIdeInterruptAndSetTaskFlag
|
|---|
| 87 |
|
|---|
| 88 | mov al, CMD_END_OF_INTERRUPT
|
|---|
| 89 | jmp SHORT AcknowledgeMasterInterruptController
|
|---|
| 90 |
|
|---|
| 91 |
|
|---|
| 92 | ALIGN JUMP_ALIGN
|
|---|
| 93 | IdeIrq_InterruptServiceRoutineForIrqs8to15:
|
|---|
| 94 | push di
|
|---|
| 95 | push ax
|
|---|
| 96 | call AcknowledgeIdeInterruptAndSetTaskFlag
|
|---|
| 97 |
|
|---|
| 98 | mov al, CMD_END_OF_INTERRUPT ; Load EOI command to AL
|
|---|
| 99 | out WPORT_8259SL_COMMAND, al ; Acknowledge Slave 8259
|
|---|
| 100 | AcknowledgeMasterInterruptController:
|
|---|
| 101 | out WPORT_8259MA_COMMAND, al ; Acknowledge Master 8259
|
|---|
| 102 |
|
|---|
| 103 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
|
|---|
| 104 | mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD)
|
|---|
| 105 | int BIOS_SYSTEM_INTERRUPT_15h
|
|---|
| 106 |
|
|---|
| 107 | pop ax
|
|---|
| 108 | pop di
|
|---|
| 109 | iret
|
|---|
| 110 |
|
|---|
| 111 |
|
|---|
| 112 | ;--------------------------------------------------------------------
|
|---|
| 113 | ; AcknowledgeIdeInterruptAndSetTaskFlag
|
|---|
| 114 | ; Parameters:
|
|---|
| 115 | ; Nothing
|
|---|
| 116 | ; Returns:
|
|---|
| 117 | ; Nothing
|
|---|
| 118 | ; Corrupts registers:
|
|---|
| 119 | ; AX
|
|---|
| 120 | ;--------------------------------------------------------------------
|
|---|
| 121 | ALIGN JUMP_ALIGN
|
|---|
| 122 | AcknowledgeIdeInterruptAndSetTaskFlag:
|
|---|
| 123 | push ds
|
|---|
| 124 | push dx
|
|---|
| 125 | push bx
|
|---|
| 126 |
|
|---|
| 127 | ; Reading Status Register acknowledges IDE interrupt
|
|---|
| 128 | call RamVars_GetSegmentToDS
|
|---|
| 129 | mov di, [RAMVARS.pInServiceDPT] ; DS:DI now points to DPT
|
|---|
| 130 | mov dl, STATUS_REGISTER_in
|
|---|
| 131 | call Device_InputToALfromIdeRegisterInDL
|
|---|
| 132 |
|
|---|
| 133 | ; Set Task Flag
|
|---|
| 134 | LOAD_BDA_SEGMENT_TO ds, ax
|
|---|
| 135 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
|
|---|
| 136 |
|
|---|
| 137 | pop bx
|
|---|
| 138 | pop dx
|
|---|
| 139 | pop ds
|
|---|
| 140 | ret
|
|---|
