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/*
* Copyright (c) 1995 Shantanu Goel
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*/
#include <mach/machine/asm.h>
#include <i386/ipl.h>
#include <i386/pic.h>
#include <i386/i386asm.h>
#define READ_ISR (OCW_TEMPLATE|READ_NEXT_RD|READ_IS_ONRD)
/*
* Generic interrupt handler.
*
* On entry, %eax contains the irq number.
*/
ENTRY(interrupt)
pushl %eax /* save irq number */
movl %eax,%ecx /* copy irq number */
shll $2,%ecx /* irq * 4 */
call spl7 /* set ipl */
movl EXT(iunit)(%ecx),%edx /* get device unit number */
pushl %eax /* push previous ipl */
pushl %edx /* push unit number */
call *EXT(ivect)(%ecx) /* call interrupt handler */
addl $4,%esp /* pop unit number */
call splx_cli /* restore previous ipl */
addl $4,%esp /* pop previous ipl */
cli /* XXX no more nested interrupts */
popl %ecx /* restore irq number */
movl $1,%eax
shll %cl,%eax /* get corresponding IRQ mask */
orl EXT(curr_pic_mask),%eax /* add current mask */
cmpl $8,%ecx /* do we need to ack slave? */
jl 1f /* no, only master */
/* EOI on slave */
movb %ah,%al
outb %al,$(PIC_SLAVE_OCW) /* mask slave out */
movb $(SPECIFIC_EOI),%al /* specific EOI for this irq */
andb $7,%cl /* irq number for the slave */
orb %cl,%al /* combine them */
outb %al,$(PIC_SLAVE_ICW) /* ack interrupt to slave */
movb $(SPECIFIC_EOI + I_AM_SLAVE_2),%al /* specific master EOI for cascaded slave */
outb %al,$(PIC_MASTER_ICW) /* ack interrupt to master */
movl EXT(curr_pic_mask),%eax /* restore original mask */
movb %ah,%al
outb %al,$(PIC_SLAVE_OCW) /* unmask slave */
jmp 2f
1:
/* EOI on master */
outb %al,$(PIC_MASTER_OCW) /* mask master out */
movb $(SPECIFIC_EOI),%al /* specific EOI for this irq */
orb %cl,%al /* combine with irq number */
outb %al,$(PIC_MASTER_ICW) /* ack interrupt to master */
movl EXT(curr_pic_mask),%eax /* restore original mask */
outb %al,$(PIC_MASTER_OCW) /* unmask master */
2:
ret
END(interrupt)
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