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 "opt_hwpmc_hooks.h"
35 #include "opt_platform.h"
36
37 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/bus.h>
42 #include <sys/interrupt.h>
43 #include <sys/kernel.h>
44 #include <sys/kthread.h>
45 #include <sys/ktr.h>
46 #include <sys/lock.h>
47 #include <sys/malloc.h>
48 #include <sys/mutex.h>
49 #ifdef HWPMC_HOOKS
50 #include <sys/pmckern.h>
51 #endif
52 #include <sys/proc.h>
53 #include <sys/smp.h>
54 #include <sys/unistd.h>
55 #include <sys/vmmeter.h>
56
57 #include <machine/cpu.h>
58 #include <machine/clock.h>
59 #include <machine/db_machdep.h>
60 #include <machine/fpu.h>
61 #include <machine/frame.h>
62 #include <machine/intr_machdep.h>
63 #include <machine/md_var.h>
64 #include <machine/pcb.h>
65 #include <machine/psl.h>
66 #include <machine/trap.h>
67 #include <machine/spr.h>
68 #include <machine/sr.h>
69
70 #include "pic_if.h"
71
72 #ifdef POWERNV
73 int (*hmi_handler)(struct trapframe *);
74 #endif
75
76 /*
77 * A very short dispatch, to try and maximise assembler code use
78 * between all exception types. Maybe 'true' interrupts should go
79 * here, and the trap code can come in separately
80 */
81 void
82 powerpc_interrupt(struct trapframe *framep)
83 {
84 struct thread *td;
85 struct trapframe *oldframe;
86 register_t ee;
87
88 td = curthread;
89
90 CTR2(KTR_INTR, "%s: EXC=%x", __func__, framep->exc);
91
92 switch (framep->exc) {
93 case EXC_EXI:
94 case EXC_HVI:
95 critical_enter();
96 PIC_DISPATCH(root_pic, framep);
97 critical_exit();
98 #ifdef BOOKE
99 framep->srr1 &= ~PSL_WE;
100 #endif
101 break;
102
103 case EXC_DECR:
104 critical_enter();
105 atomic_add_int(&td->td_intr_nesting_level, 1);
106 oldframe = td->td_intr_frame;
107 td->td_intr_frame = framep;
108 decr_intr(framep);
109 td->td_intr_frame = oldframe;
110 atomic_subtract_int(&td->td_intr_nesting_level, 1);
111 critical_exit();
112 #ifdef BOOKE
113 framep->srr1 &= ~PSL_WE;
114 #endif
115 break;
116 #ifdef HWPMC_HOOKS
117 case EXC_PERF:
118 critical_enter();
119 KASSERT(pmc_intr != NULL, ("Performance exception, but no handler!"));
120 (*pmc_intr)(framep);
121 critical_exit();
122 if (pmc_hook && (PCPU_GET(curthread)->td_pflags & TDP_CALLCHAIN))
123 pmc_hook(PCPU_GET(curthread), PMC_FN_USER_CALLCHAIN, framep);
124 break;
125 #endif
126
127 #ifdef POWERNV
128 case EXC_HMI:
129 if (hmi_handler != 0 && hmi_handler(framep) == 0)
130 break;
131 /* If no handler, or failure to handle, just drop to trap. */
132 #endif
133
134 default:
135 /* Re-enable interrupts if applicable. */
136 ee = framep->srr1 & PSL_EE;
137 if (ee != 0)
138 mtmsr(mfmsr() | ee);
139 trap(framep);
140 }
141 }
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