1/*-
2 * Copyright 2002 by Peter Grehan. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30/*
31 * Interrupts are dispatched to here from locore asm
32 */
33
34#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/bus.h>
39#include <sys/interrupt.h>
40#include <sys/kernel.h>
41#include <sys/kthread.h>
42#include <sys/ktr.h>
43#include <sys/lock.h>
44#include <sys/malloc.h>
45#include <sys/mutex.h>
46#include <sys/proc.h>
47#include <sys/smp.h>
48#include <sys/unistd.h>
49#include <sys/vmmeter.h>
50
51#include <machine/cpu.h>
52#include <machine/clock.h>
53#include <machine/db_machdep.h>
54#include <machine/fpu.h>
55#include <machine/frame.h>
56#include <machine/intr_machdep.h>
57#include <machine/md_var.h>
58#include <machine/pcb.h>
59#include <machine/psl.h>
60#include <machine/trap.h>
61#include <machine/spr.h>
62#include <machine/sr.h>
63
64#include "pic_if.h"
65
66/*
67 * A very short dispatch, to try and maximise assembler code use
68 * between all exception types. Maybe 'true' interrupts should go
69 * here, and the trap code can come in separately
70 */
71void
72powerpc_interrupt(struct trapframe *framep)
73{
74	struct thread *td;
75	struct trapframe *oldframe;
76	register_t ee;
77
78	td = curthread;
79
80	CTR2(KTR_INTR, "%s: EXC=%x", __func__, framep->exc);
81
82	switch (framep->exc) {
83	case EXC_EXI:
84		critical_enter();
85		PIC_DISPATCH(root_pic, framep);
86		critical_exit();
87		break;
88
89	case EXC_DECR:
90		critical_enter();
91		atomic_add_int(&td->td_intr_nesting_level, 1);
92		oldframe = td->td_intr_frame;
93		td->td_intr_frame = framep;
94		decr_intr(framep);
95		td->td_intr_frame = oldframe;
96		atomic_subtract_int(&td->td_intr_nesting_level, 1);
97		critical_exit();
98		break;
99
100	default:
101		/* Re-enable interrupts if applicable. */
102		ee = framep->srr1 & PSL_EE;
103		if (ee != 0)
104			mtmsr(mfmsr() | ee);
105		trap(framep);
106	}
107}
108