1 /* $NetBSD: softint_machdep.c,v 1.3 2023/05/07 12:41:49 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 __RCSID("$NetBSD: softint_machdep.c,v 1.3 2023/05/07 12:41:49 skrll Exp $");
35
36 #define __INTR_PRIVATE
37
38 #include <sys/param.h>
39 #include <sys/intr.h>
40
41 #include <riscv/locore.h>
42
43 #ifdef __HAVE_FAST_SOFTINTS
44
45 #define SOFTINT2IPLMAP \
46 (((IPL_SOFTSERIAL - IPL_SOFTCLOCK) << (SOFTINT_SERIAL * 4)) | \
47 ((IPL_SOFTNET - IPL_SOFTCLOCK) << (SOFTINT_NET * 4)) | \
48 ((IPL_SOFTBIO - IPL_SOFTCLOCK) << (SOFTINT_BIO * 4)) | \
49 ((IPL_SOFTCLOCK - IPL_SOFTCLOCK) << (SOFTINT_CLOCK * 4)))
50 #define SOFTINT2IPL(l) ((SOFTINT2IPLMAP >> ((l) * 4)) & 0x0f)
51
52 /*
53 * This returns a mask of softint IPLs that be dispatch at <ipl>
54 * SOFTIPLMASK(IPL_NONE) = 0x0000000f
55 * SOFTIPLMASK(IPL_SOFTCLOCK) = 0x0000000e
56 * SOFTIPLMASK(IPL_SOFTBIO) = 0x0000000c
57 * SOFTIPLMASK(IPL_SOFTNET) = 0x00000008
58 * SOFTIPLMASK(IPL_SOFTSERIAL) = 0x00000000
59 */
60 #define SOFTIPLMASK(ipl) ((0x0f << (ipl)) & 0x0f)
61
62 void softint_switch(lwp_t *, int);
63
64 void
softint_trigger(uintptr_t mask)65 softint_trigger(uintptr_t mask)
66 {
67 curcpu()->ci_softints |= mask;
68 }
69
70 void
softint_init_md(lwp_t * l,u_int level,uintptr_t * machdep)71 softint_init_md(lwp_t *l, u_int level, uintptr_t *machdep)
72 {
73 lwp_t ** lp = &l->l_cpu->ci_softlwps[level];
74 KASSERT(*lp == NULL || *lp == l);
75 *lp = l;
76 *machdep = 1 << SOFTINT2IPL(level);
77 KASSERT(level != SOFTINT_CLOCK || *machdep == (1 << (IPL_SOFTCLOCK - IPL_SOFTCLOCK)));
78 KASSERT(level != SOFTINT_BIO || *machdep == (1 << (IPL_SOFTBIO - IPL_SOFTCLOCK)));
79 KASSERT(level != SOFTINT_NET || *machdep == (1 << (IPL_SOFTNET - IPL_SOFTCLOCK)));
80 KASSERT(level != SOFTINT_SERIAL || *machdep == (1 << (IPL_SOFTSERIAL - IPL_SOFTCLOCK)));
81 }
82
83 void
softint_deliver(void)84 softint_deliver(void)
85 {
86 struct cpu_info * const ci = curcpu();
87 const int opl = ci->ci_cpl;
88 const uint32_t softiplmask = SOFTIPLMASK(opl);
89
90 splhigh();
91 for (;;) {
92 u_int softints = ci->ci_softints & softiplmask;
93 KASSERT((softints != 0) == ((ci->ci_softints >> opl) != 0));
94 KASSERT(opl == IPL_NONE || (softints & (1 << (opl - IPL_SOFTCLOCK))) == 0);
95 if (softints == 0) {
96 splx(opl);
97 return;
98 }
99 #define DOSOFTINT(n) \
100 if (ci->ci_softints & (1 << (IPL_SOFT ## n - IPL_SOFTCLOCK))) { \
101 ci->ci_softints &= \
102 ~(1 << (IPL_SOFT ## n - IPL_SOFTCLOCK)); \
103 cpu_fast_switchto(ci->ci_softlwps[SOFTINT_ ## n], \
104 IPL_SOFT ## n); \
105 continue; \
106 }
107 DOSOFTINT(SERIAL);
108 DOSOFTINT(NET);
109 DOSOFTINT(BIO);
110 DOSOFTINT(CLOCK);
111 panic("dosoftints wtf (softints=%u?, ipl=%d)", softints, opl);
112 }
113 }
114 #endif /* __HAVE_FAST_SOFTINTS */
115