1 /* $OpenBSD: sys_machdep.c,v 1.11 2019/12/20 13:34:41 visa Exp $ */
2
3 /*
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)sys_machdep.c 8.1 (Berkeley) 6/10/93
39 */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/ioctl.h>
44 #include <sys/time.h>
45 #include <sys/proc.h>
46 #include <sys/kernel.h>
47 #include <sys/buf.h>
48
49 #include <sys/mount.h>
50 #include <sys/syscallargs.h>
51
52 #include <uvm/uvm_extern.h>
53
54 #include <mips64/cache.h>
55 #include <mips64/sysarch.h>
56
57 #include <machine/autoconf.h>
58
59 int mips64_cacheflush(struct proc *, struct mips64_cacheflush_args *);
60
61 int
sys_sysarch(struct proc * p,void * v,register_t * retval)62 sys_sysarch(struct proc *p, void *v, register_t *retval)
63 {
64 struct sys_sysarch_args /* {
65 syscallarg(int) op;
66 syscallarg(char *) parms;
67 } */ *uap = v;
68 int error = 0;
69
70 switch(SCARG(uap, op)) {
71 case MIPS64_CACHEFLUSH:
72 {
73 struct mips64_cacheflush_args cfa;
74
75 if ((error = copyin(SCARG(uap, parms), &cfa, sizeof cfa)) != 0)
76 return error;
77 error = mips64_cacheflush(p, &cfa);
78 }
79 break;
80 default:
81 error = EINVAL;
82 break;
83 }
84
85 return error;
86 }
87
88 int
mips64_cacheflush(struct proc * p,struct mips64_cacheflush_args * cfa)89 mips64_cacheflush(struct proc *p, struct mips64_cacheflush_args *cfa)
90 {
91 vaddr_t va;
92 paddr_t pa;
93 size_t sz, chunk;
94 struct vm_map *map = &p->p_vmspace->vm_map;
95 struct pmap *pm = map->pmap;
96 struct vm_map_entry *entry;
97 int rc = 0;
98
99 /*
100 * Sanity checks.
101 */
102 if ((cfa->which & BCACHE) != cfa->which)
103 return EINVAL;
104
105 if (cfa->which == 0)
106 return 0;
107
108 va = cfa->va;
109 sz = cfa->sz;
110 chunk = PAGE_SIZE - (va & PAGE_MASK);
111 vm_map_lock_read(map);
112 if (va < vm_map_min(map) || va + sz > vm_map_max(map) || va + sz < va)
113 rc = EFAULT;
114 else while (sz != 0) {
115 if (chunk > sz)
116 chunk = sz;
117
118 /*
119 * Check for a resident mapping first, this is faster than
120 * uvm_map_lookup_entry().
121 */
122 if (pmap_extract(pm, va, &pa) != 0) {
123 if (cfa->which & ICACHE)
124 Mips_InvalidateICache(p->p_cpu, va, chunk);
125 if (cfa->which & DCACHE)
126 Mips_HitSyncDCache(p->p_cpu, va, chunk);
127 } else {
128 if (uvm_map_lookup_entry(map, va, &entry) == FALSE) {
129 rc = EFAULT;
130 break;
131 }
132 /* else simply not resident at the moment */
133 }
134
135 va += chunk;
136 sz -= chunk;
137 chunk = PAGE_SIZE;
138 }
139 vm_map_unlock_read(map);
140
141 return rc;
142 }
143