[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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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[526] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 18 | ; |
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[376] | 19 | |
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[150] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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| 24 | ; IdeIrq_WaitForIRQ |
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| 25 | ; Parameters: |
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| 26 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 27 | ; Returns: |
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[535] | 28 | ; Nothing |
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[150] | 29 | ; Corrupts registers: |
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| 30 | ; AX |
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| 31 | ;-------------------------------------------------------------------- |
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| 32 | ALIGN JUMP_ALIGN |
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| 33 | IdeIrq_WaitForIRQ: |
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| 34 | push ds |
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| 35 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX |
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| 36 | mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h) |
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| 37 | cli ; Disable interrupts |
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[540] | 38 | dec BYTE [BDA.bHDTaskFlg] ; Clear to zero if still waiting for IRQ |
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| 39 | pop ds |
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| 40 | jnz SHORT .ReturnFromWaitNotify ; IRQ already! (CompactFlash was faster than CPU) |
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[150] | 41 | int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy |
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| 42 | |
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| 43 | .ReturnFromWaitNotify: |
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[161] | 44 | sti ; Enable interrupts |
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[150] | 45 | ret |
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| 46 | |
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| 47 | |
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| 48 | ;-------------------------------------------------------------------- |
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| 49 | ; IDE Interrupt Service Routines. |
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| 50 | ; |
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| 51 | ; IdeIrq_InterruptServiceRoutineForIrqs2to7 |
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| 52 | ; IdeIrq_InterruptServiceRoutineForIrqs8to15 |
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| 53 | ; Parameters: |
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| 54 | ; Nothing |
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| 55 | ; Returns: |
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| 56 | ; Nothing |
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| 57 | ; Corrupts registers: |
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| 58 | ; Nothing |
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| 59 | ;-------------------------------------------------------------------- |
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| 60 | ALIGN JUMP_ALIGN |
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| 61 | IdeIrq_InterruptServiceRoutineForIrqs2to7: |
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| 62 | push ax |
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[540] | 63 | mov al, COMMAND_END_OF_INTERRUPT |
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[150] | 64 | |
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[540] | 65 | %ifdef USE_AT |
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[150] | 66 | jmp SHORT AcknowledgeMasterInterruptController |
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| 67 | |
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| 68 | ALIGN JUMP_ALIGN |
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| 69 | IdeIrq_InterruptServiceRoutineForIrqs8to15: |
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| 70 | push ax |
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[152] | 71 | mov al, COMMAND_END_OF_INTERRUPT |
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| 72 | out SLAVE_8259_COMMAND_out, al ; Acknowledge Slave 8259 |
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[540] | 73 | JMP_DELAY |
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[150] | 74 | AcknowledgeMasterInterruptController: |
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[540] | 75 | %endif ; USE_AT |
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| 76 | |
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[152] | 77 | out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259 |
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[150] | 78 | |
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[540] | 79 | ; Set Task Flag |
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| 80 | push ds |
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| 81 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Clear AL and CF for INT 15h |
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| 82 | dec BYTE [BDA.bHDTaskFlg] ; Set task flag (or clear if IRQ occurred before call to INT 15h AH=90h) |
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| 83 | sti ; Enable interrupts |
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| 84 | pop ds |
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| 85 | |
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[150] | 86 | ; Issue Int 15h, function AX=9100h (Interrupt ready) |
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[540] | 87 | jz SHORT .DoNotPostSinceIrqOccurredBeforeWait |
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| 88 | mov ah, OS_HOOK_DEVICE_POST ; Interrupt ready, device 0 (HD) |
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[150] | 89 | int BIOS_SYSTEM_INTERRUPT_15h |
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[540] | 90 | .DoNotPostSinceIrqOccurredBeforeWait: |
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[150] | 91 | |
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| 92 | pop ax |
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| 93 | iret |
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