1 /* $NetBSD: scb.c,v 1.19 2017/05/22 16:53:05 ragge Exp $ */
2 /*
3 * Copyright (c) 1999 Ludd, University of Lule}, Sweden.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
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, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 /*
27 * Routines for dynamic allocation/release of SCB vectors.
28 */
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: scb.c,v 1.19 2017/05/22 16:53:05 ragge Exp $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/cpu.h>
36 #include <sys/device.h>
37 #include <sys/kernel.h>
38
39 #include <machine/trap.h>
40 #include <machine/scb.h>
41 #include <machine/frame.h>
42 #include <machine/sid.h>
43
44 struct scb *scb;
45 struct ivec_dsp *scb_vec;
46
47 void scb_stray(void *);
48 static volatile int vector, ipl, gotintr;
49
50 /*
51 * Generates a new SCB.
52 */
53 paddr_t
scb_init(paddr_t avail_start)54 scb_init(paddr_t avail_start)
55 {
56 struct ivec_dsp **ivec = (struct ivec_dsp **)avail_start;
57 struct ivec_dsp **old = (struct ivec_dsp **)KERNBASE;
58 vaddr_t vavail = avail_start + KERNBASE;
59 int scb_size = dep_call->cpu_scbsz;
60 int i;
61
62 scb = (struct scb *)vavail;
63 scb_vec = (struct ivec_dsp *)(vavail + (scb_size * VAX_NBPG));
64
65 /* Init the whole SCB with interrupt catchers */
66 for (i = 0; i < (scb_size * VAX_NBPG)/4; i++) {
67 ivec[i] = &scb_vec[i];
68 *(uintptr_t *)&ivec[i] |= 1; /* On istack, please */
69 scb_vec[i] = idsptch;
70 scb_vec[i].hoppaddr = scb_stray;
71 scb_vec[i].pushlarg = (void *) (i * 4);
72 scb_vec[i].ev = NULL;
73 }
74 /*
75 * Copy all pre-set interrupt vectors to the new SCB.
76 * It is known that these vectors is at KERNBASE from the
77 * beginning, and that if the vector is zero it should call
78 * stray instead.
79 */
80 for (i = 0; i < 64; i++)
81 if (old[i])
82 ivec[i] = old[i];
83 /* Last action: set the SCB */
84 mtpr(avail_start, PR_SCBB);
85
86 /* Return new avail_start. Also save space for the dispatchers. */
87 return avail_start + (1 + sizeof(struct ivec_dsp) / sizeof(void *))
88 * scb_size * VAX_NBPG;
89 };
90
91 /*
92 * Stray interrupt handler.
93 * This function must _not_ save any registers (in the reg save mask).
94 */
95 void
scb_stray(void * arg)96 scb_stray(void *arg)
97 {
98 gotintr = 1;
99 vector = ((int) arg) & ~3;
100 ipl = mfpr(PR_IPL);
101
102 if (cold == 0) {
103 printf("stray interrupt: vector 0x%x, ipl %d\n", vector, ipl);
104 } else if (dep_call->cpu_flags & CPU_RAISEIPL) {
105 struct icallsframe *icf = (void *) __builtin_frame_address(0);
106
107 icf->ica_psl = (icf->ica_psl & ~PSL_IPL) | ipl << 16;
108 }
109
110 mtpr(ipl + 1, PR_IPL);
111 }
112
113 /*
114 * Fake interrupt handler, to fool some bus' autodetect system.
115 * (May I say DW780? :-)
116 */
117 void
scb_fake(int vec,int br)118 scb_fake(int vec, int br)
119 {
120 vector = vec;
121 ipl = br;
122 gotintr = 1;
123 }
124
125 /*
126 * Returns last vector/ipl referenced. Clears vector/ipl after reading.
127 */
128 int
scb_vecref(int * rvec,int * ripl)129 scb_vecref(int *rvec, int *ripl)
130 {
131 int save;
132
133 if (rvec)
134 *rvec = vector;
135 if (ripl)
136 *ripl = ipl;
137 save = gotintr;
138 gotintr = vector = ipl = 0;
139 mtpr(0, PR_IPL);
140 return save;
141 }
142
143 /*
144 * Sets a vector to the specified function.
145 * Arg may not be greater than 63.
146 */
147 void
scb_vecalloc(int vecno,void (* func)(void *),void * arg,int stack,struct evcnt * ev)148 scb_vecalloc(int vecno, void (*func)(void *), void *arg,
149 int stack, struct evcnt *ev)
150 {
151 struct ivec_dsp *dsp = &scb_vec[vecno / 4];
152 dsp->hoppaddr = func;
153 dsp->pushlarg = arg;
154 dsp->ev = ev;
155 ((intptr_t *) scb)[vecno/4] = (intptr_t)(dsp) | stack;
156 }
157