| 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 | ;
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| 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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| 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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| 12 | ;
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| 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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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 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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| 28 | ; Nothing
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| 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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| 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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| 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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| 44 | sti ; Enable interrupts
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| 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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| 63 | mov al, COMMAND_END_OF_INTERRUPT
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| 64 |
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| 65 | %ifdef USE_AT
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| 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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| 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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| 73 | JMP_DELAY
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| 74 | AcknowledgeMasterInterruptController:
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| 75 | %endif ; USE_AT
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| 76 |
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| 77 | out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259
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| 78 |
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| 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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| 86 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
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| 87 | jz SHORT .DoNotPostSinceIrqOccurredBeforeWait
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| 88 | mov ah, OS_HOOK_DEVICE_POST ; Interrupt ready, device 0 (HD)
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| 89 | int BIOS_SYSTEM_INTERRUPT_15h
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| 90 | .DoNotPostSinceIrqOccurredBeforeWait:
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| 91 |
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| 92 | pop ax
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| 93 | iret
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