[150] | 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 | ; IdeIrq_WaitForIRQ |
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| 9 | ; Parameters: |
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| 10 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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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 | IdeIrq_WaitForIRQ: |
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| 19 | |
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| 20 | ;-------------------------------------------------------------------- |
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| 21 | ; .NotifyOperatingSystemAboutWaitingForIRQ |
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| 22 | ; Parameters: |
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| 23 | ; Nothing |
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| 24 | ; Returns: |
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| 25 | ; CF: Set if wait done by operating system |
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| 26 | ; Cleared if BIOS must perform task flag polling |
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| 27 | ; Corrupts registers: |
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| 28 | ; AX |
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| 29 | ;-------------------------------------------------------------------- |
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| 30 | .NotifyOperatingSystemAboutWaitingForIRQ: |
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| 31 | push ds |
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| 32 | |
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| 33 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX |
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| 34 | mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h) |
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| 35 | cli ; Disable interrupts |
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| 36 | cmp al, [BDA.bHDTaskFlg] ; Task flag already set? |
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| 37 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification |
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| 38 | int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy |
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| 39 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting |
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| 40 | |
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| 41 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function |
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| 42 | test ah, ah ; OS hook supported? (clears CF) |
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| 43 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait |
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| 44 | stc ; Set CF since wait done by OS |
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| 45 | .ReturnFromWaitNotify: |
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[161] | 46 | sti ; Enable interrupts |
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[150] | 47 | pop ds |
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| 48 | ret |
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| 49 | |
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| 50 | |
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| 51 | ;-------------------------------------------------------------------- |
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| 52 | ; IDE Interrupt Service Routines. |
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| 53 | ; |
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| 54 | ; IdeIrq_InterruptServiceRoutineForIrqs2to7 |
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| 55 | ; IdeIrq_InterruptServiceRoutineForIrqs8to15 |
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| 56 | ; Parameters: |
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| 57 | ; Nothing |
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| 58 | ; Returns: |
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| 59 | ; Nothing |
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| 60 | ; Corrupts registers: |
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| 61 | ; Nothing |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | IdeIrq_InterruptServiceRoutineForIrqs2to7: |
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| 65 | push di |
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| 66 | push ax |
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| 67 | call AcknowledgeIdeInterruptAndSetTaskFlag |
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| 68 | |
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[152] | 69 | mov al, COMMAND_END_OF_INTERRUPT |
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[150] | 70 | jmp SHORT AcknowledgeMasterInterruptController |
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| 71 | |
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| 72 | |
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| 73 | ALIGN JUMP_ALIGN |
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| 74 | IdeIrq_InterruptServiceRoutineForIrqs8to15: |
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| 75 | push di |
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| 76 | push ax |
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| 77 | call AcknowledgeIdeInterruptAndSetTaskFlag |
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| 78 | |
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[152] | 79 | mov al, COMMAND_END_OF_INTERRUPT |
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| 80 | out SLAVE_8259_COMMAND_out, al ; Acknowledge Slave 8259 |
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[150] | 81 | AcknowledgeMasterInterruptController: |
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[152] | 82 | out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259 |
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[150] | 83 | |
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| 84 | ; Issue Int 15h, function AX=9100h (Interrupt ready) |
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| 85 | mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD) |
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| 86 | int BIOS_SYSTEM_INTERRUPT_15h |
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| 87 | |
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| 88 | pop ax |
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| 89 | pop di |
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| 90 | iret |
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| 91 | |
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| 92 | |
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| 93 | ;-------------------------------------------------------------------- |
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| 94 | ; AcknowledgeIdeInterruptAndSetTaskFlag |
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| 95 | ; Parameters: |
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| 96 | ; Nothing |
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| 97 | ; Returns: |
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| 98 | ; Nothing |
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| 99 | ; Corrupts registers: |
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| 100 | ; AX |
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| 101 | ;-------------------------------------------------------------------- |
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| 102 | ALIGN JUMP_ALIGN |
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| 103 | AcknowledgeIdeInterruptAndSetTaskFlag: |
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| 104 | push ds |
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[152] | 105 | push si |
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[150] | 106 | push dx |
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| 107 | push bx |
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| 108 | |
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| 109 | ; Reading Status Register acknowledges IDE interrupt |
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| 110 | call RamVars_GetSegmentToDS |
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[233] | 111 | mov bl, FLGH_DPT_INTERRUPT_IN_SERVICE |
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| 112 | call FindDPT_ToDSDIforFlagsHighInBL |
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[150] | 113 | mov dl, STATUS_REGISTER_in |
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[160] | 114 | call IdeIO_InputToALfromIdeRegisterInDL |
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[150] | 115 | |
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[152] | 116 | ; Clear Interrupt In-Service Flag from DPT |
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[158] | 117 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE |
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[152] | 118 | |
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[150] | 119 | ; Set Task Flag |
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| 120 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 121 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag |
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| 122 | |
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| 123 | pop bx |
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| 124 | pop dx |
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[152] | 125 | pop si |
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[150] | 126 | pop ds |
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| 127 | ret |
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