1 /* $OpenBSD: sys_machdep.c,v 1.7 2021/05/16 03:39:27 jsg Exp $ */
2 /* $NetBSD: sys_machdep.c,v 1.6 2003/07/15 00:24:42 lukem Exp $ */
3
4 /*
5 * Copyright (c) 1995-1997 Mark Brinicombe.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Mark Brinicombe
19 * 4. The name of the company nor the name of the author may be used to
20 * endorse or promote products derived from this software without specific
21 * prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * RiscBSD kernel project
36 *
37 * sys_machdep.c
38 *
39 * Machine dependant syscalls
40 *
41 * Created : 10/01/96
42 */
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/proc.h>
47 #include <sys/mount.h>
48 #include <uvm/uvm_extern.h>
49 #include <sys/sysctl.h>
50 #include <sys/syscallargs.h>
51
52 #include <machine/sysarch.h>
53
54 /* Prototypes */
55 static int arm32_sync_icache (struct proc *, char *, register_t *);
56 static int arm32_drain_writebuf (struct proc *, char *, register_t *);
57
58 static int
arm32_sync_icache(struct proc * p,char * args,register_t * retval)59 arm32_sync_icache(struct proc *p, char *args, register_t *retval)
60 {
61 struct arm_sync_icache_args ua;
62 struct vm_map *map = &p->p_vmspace->vm_map;
63 struct vm_map_entry *entry;
64 vaddr_t va;
65 vsize_t sz, chunk;
66 int error;
67
68 if ((error = copyin(args, &ua, sizeof(ua))) != 0)
69 return (error);
70
71 va = ua.addr;
72 sz = ua.len;
73
74 vm_map_lock_read(map);
75
76 if (va + sz <= vm_map_min(map) || va >= vm_map_max(map) ||
77 va + sz < va)
78 goto out;
79
80 if (va < vm_map_min(map)) {
81 sz -= vm_map_min(map) - va;
82 va = vm_map_min(map);
83 } else if (va + sz >= vm_map_max(map)) {
84 sz = vm_map_max(map) - va;
85 }
86
87 chunk = PAGE_SIZE - (va & PAGE_MASK);
88 while (sz > 0) {
89 if (chunk > sz)
90 chunk = sz;
91
92 if (uvm_map_lookup_entry(map, va, &entry))
93 cpu_icache_sync_range(va, chunk);
94
95 va += chunk;
96 sz -= chunk;
97 chunk = PAGE_SIZE;
98 }
99
100 out:
101 vm_map_unlock_read(map);
102
103 *retval = 0;
104 return(0);
105 }
106
107 static int
arm32_drain_writebuf(struct proc * p,char * args,register_t * retval)108 arm32_drain_writebuf(struct proc *p, char *args, register_t *retval)
109 {
110 /* No args. */
111
112 cpu_drain_writebuf();
113
114 *retval = 0;
115 return(0);
116 }
117
118 int
sys_sysarch(struct proc * p,void * v,register_t * retval)119 sys_sysarch(struct proc *p, void *v, register_t *retval)
120 {
121 struct sys_sysarch_args /* {
122 syscallarg(int) op;
123 syscallarg(void *) parms;
124 } */ *uap = v;
125 int error = 0;
126
127 switch(SCARG(uap, op)) {
128 case ARM_SYNC_ICACHE :
129 error = arm32_sync_icache(p, SCARG(uap, parms), retval);
130 break;
131
132 case ARM_DRAIN_WRITEBUF :
133 error = arm32_drain_writebuf(p, SCARG(uap, parms), retval);
134 break;
135
136 default:
137 error = EINVAL;
138 break;
139 }
140 return (error);
141 }
142