m25p80: don't let rogue SPI controllers cause buffer overruns
[qemu.git] / accel.c
1 /*
2 * QEMU System Emulator, accelerator interfaces
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2014 Red Hat Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26 #include "qemu/osdep.h"
27 #include "sysemu/accel.h"
28 #include "hw/boards.h"
29 #include "qemu-common.h"
30 #include "sysemu/arch_init.h"
31 #include "sysemu/sysemu.h"
32 #include "sysemu/kvm.h"
33 #include "sysemu/qtest.h"
34 #include "hw/xen/xen.h"
35 #include "qom/object.h"
36
37 int tcg_tb_size;
38 static bool tcg_allowed = true;
39
40 static int tcg_init(MachineState *ms)
41 {
42 tcg_exec_init(tcg_tb_size * 1024 * 1024);
43 return 0;
44 }
45
46 static const TypeInfo accel_type = {
47 .name = TYPE_ACCEL,
48 .parent = TYPE_OBJECT,
49 .class_size = sizeof(AccelClass),
50 .instance_size = sizeof(AccelState),
51 };
52
53 /* Lookup AccelClass from opt_name. Returns NULL if not found */
54 static AccelClass *accel_find(const char *opt_name)
55 {
56 char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
57 AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
58 g_free(class_name);
59 return ac;
60 }
61
62 static int accel_init_machine(AccelClass *acc, MachineState *ms)
63 {
64 ObjectClass *oc = OBJECT_CLASS(acc);
65 const char *cname = object_class_get_name(oc);
66 AccelState *accel = ACCEL(object_new(cname));
67 int ret;
68 ms->accelerator = accel;
69 *(acc->allowed) = true;
70 ret = acc->init_machine(ms);
71 if (ret < 0) {
72 ms->accelerator = NULL;
73 *(acc->allowed) = false;
74 object_unref(OBJECT(accel));
75 }
76 return ret;
77 }
78
79 void configure_accelerator(MachineState *ms)
80 {
81 const char *p;
82 char buf[10];
83 int ret;
84 bool accel_initialised = false;
85 bool init_failed = false;
86 AccelClass *acc = NULL;
87
88 p = qemu_opt_get(qemu_get_machine_opts(), "accel");
89 if (p == NULL) {
90 /* Use the default "accelerator", tcg */
91 p = "tcg";
92 }
93
94 while (!accel_initialised && *p != '\0') {
95 if (*p == ':') {
96 p++;
97 }
98 p = get_opt_name(buf, sizeof(buf), p, ':');
99 acc = accel_find(buf);
100 if (!acc) {
101 fprintf(stderr, "\"%s\" accelerator not found.\n", buf);
102 continue;
103 }
104 if (acc->available && !acc->available()) {
105 printf("%s not supported for this target\n",
106 acc->name);
107 continue;
108 }
109 ret = accel_init_machine(acc, ms);
110 if (ret < 0) {
111 init_failed = true;
112 fprintf(stderr, "failed to initialize %s: %s\n",
113 acc->name,
114 strerror(-ret));
115 } else {
116 accel_initialised = true;
117 }
118 }
119
120 if (!accel_initialised) {
121 if (!init_failed) {
122 fprintf(stderr, "No accelerator found!\n");
123 }
124 exit(1);
125 }
126
127 if (init_failed) {
128 fprintf(stderr, "Back to %s accelerator.\n", acc->name);
129 }
130 }
131
132
133 static void tcg_accel_class_init(ObjectClass *oc, void *data)
134 {
135 AccelClass *ac = ACCEL_CLASS(oc);
136 ac->name = "tcg";
137 ac->init_machine = tcg_init;
138 ac->allowed = &tcg_allowed;
139 }
140
141 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
142
143 static const TypeInfo tcg_accel_type = {
144 .name = TYPE_TCG_ACCEL,
145 .parent = TYPE_ACCEL,
146 .class_init = tcg_accel_class_init,
147 };
148
149 static void register_accel_types(void)
150 {
151 type_register_static(&accel_type);
152 type_register_static(&tcg_accel_type);
153 }
154
155 type_init(register_accel_types);