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 */
71 void
72 powerpc_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 }
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