trap signals for "-serial mon:stdio"
[qemu.git] / device_tree.c
1 /*
2 * Functions to help device tree manipulation using libfdt.
3 * It also provides functions to read entries from device tree proc
4 * interface.
5 *
6 * Copyright 2008 IBM Corporation.
7 * Authors: Jerone Young <jyoung5@us.ibm.com>
8 * Hollis Blanchard <hollisb@us.ibm.com>
9 *
10 * This work is licensed under the GNU GPL license version 2 or later.
11 *
12 */
13
14 #include <stdio.h>
15 #include <sys/types.h>
16 #include <sys/stat.h>
17 #include <fcntl.h>
18 #include <unistd.h>
19 #include <stdlib.h>
20
21 #include "config.h"
22 #include "qemu-common.h"
23 #include "sysemu/device_tree.h"
24 #include "hw/loader.h"
25 #include "qemu/option.h"
26 #include "qemu/config-file.h"
27
28 #include <libfdt.h>
29
30 #define FDT_MAX_SIZE 0x10000
31
32 void *create_device_tree(int *sizep)
33 {
34 void *fdt;
35 int ret;
36
37 *sizep = FDT_MAX_SIZE;
38 fdt = g_malloc0(FDT_MAX_SIZE);
39 ret = fdt_create(fdt, FDT_MAX_SIZE);
40 if (ret < 0) {
41 goto fail;
42 }
43 ret = fdt_begin_node(fdt, "");
44 if (ret < 0) {
45 goto fail;
46 }
47 ret = fdt_end_node(fdt);
48 if (ret < 0) {
49 goto fail;
50 }
51 ret = fdt_finish(fdt);
52 if (ret < 0) {
53 goto fail;
54 }
55 ret = fdt_open_into(fdt, fdt, *sizep);
56 if (ret) {
57 fprintf(stderr, "Unable to copy device tree in memory\n");
58 exit(1);
59 }
60
61 return fdt;
62 fail:
63 fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
64 exit(1);
65 }
66
67 void *load_device_tree(const char *filename_path, int *sizep)
68 {
69 int dt_size;
70 int dt_file_load_size;
71 int ret;
72 void *fdt = NULL;
73
74 *sizep = 0;
75 dt_size = get_image_size(filename_path);
76 if (dt_size < 0) {
77 printf("Unable to get size of device tree file '%s'\n",
78 filename_path);
79 goto fail;
80 }
81
82 /* Expand to 2x size to give enough room for manipulation. */
83 dt_size += 10000;
84 dt_size *= 2;
85 /* First allocate space in qemu for device tree */
86 fdt = g_malloc0(dt_size);
87
88 dt_file_load_size = load_image(filename_path, fdt);
89 if (dt_file_load_size < 0) {
90 printf("Unable to open device tree file '%s'\n",
91 filename_path);
92 goto fail;
93 }
94
95 ret = fdt_open_into(fdt, fdt, dt_size);
96 if (ret) {
97 printf("Unable to copy device tree in memory\n");
98 goto fail;
99 }
100
101 /* Check sanity of device tree */
102 if (fdt_check_header(fdt)) {
103 printf ("Device tree file loaded into memory is invalid: %s\n",
104 filename_path);
105 goto fail;
106 }
107 *sizep = dt_size;
108 return fdt;
109
110 fail:
111 g_free(fdt);
112 return NULL;
113 }
114
115 static int findnode_nofail(void *fdt, const char *node_path)
116 {
117 int offset;
118
119 offset = fdt_path_offset(fdt, node_path);
120 if (offset < 0) {
121 fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path,
122 fdt_strerror(offset));
123 exit(1);
124 }
125
126 return offset;
127 }
128
129 int qemu_devtree_setprop(void *fdt, const char *node_path,
130 const char *property, const void *val_array, int size)
131 {
132 int r;
133
134 r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size);
135 if (r < 0) {
136 fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path,
137 property, fdt_strerror(r));
138 exit(1);
139 }
140
141 return r;
142 }
143
144 int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
145 const char *property, uint32_t val)
146 {
147 int r;
148
149 r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
150 if (r < 0) {
151 fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__,
152 node_path, property, val, fdt_strerror(r));
153 exit(1);
154 }
155
156 return r;
157 }
158
159 int qemu_devtree_setprop_u64(void *fdt, const char *node_path,
160 const char *property, uint64_t val)
161 {
162 val = cpu_to_be64(val);
163 return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val));
164 }
165
166 int qemu_devtree_setprop_string(void *fdt, const char *node_path,
167 const char *property, const char *string)
168 {
169 int r;
170
171 r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
172 if (r < 0) {
173 fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__,
174 node_path, property, string, fdt_strerror(r));
175 exit(1);
176 }
177
178 return r;
179 }
180
181 const void *qemu_devtree_getprop(void *fdt, const char *node_path,
182 const char *property, int *lenp)
183 {
184 int len;
185 const void *r;
186 if (!lenp) {
187 lenp = &len;
188 }
189 r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
190 if (!r) {
191 fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__,
192 node_path, property, fdt_strerror(*lenp));
193 exit(1);
194 }
195 return r;
196 }
197
198 uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path,
199 const char *property)
200 {
201 int len;
202 const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len);
203 if (len != 4) {
204 fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n",
205 __func__, node_path, property);
206 exit(1);
207 }
208 return be32_to_cpu(*p);
209 }
210
211 uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)
212 {
213 uint32_t r;
214
215 r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
216 if (r == 0) {
217 fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
218 path, fdt_strerror(r));
219 exit(1);
220 }
221
222 return r;
223 }
224
225 int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
226 const char *property,
227 const char *target_node_path)
228 {
229 uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path);
230 return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
231 }
232
233 uint32_t qemu_devtree_alloc_phandle(void *fdt)
234 {
235 static int phandle = 0x0;
236
237 /*
238 * We need to find out if the user gave us special instruction at
239 * which phandle id to start allocting phandles.
240 */
241 if (!phandle) {
242 QemuOpts *machine_opts;
243 machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
244 if (machine_opts) {
245 const char *phandle_start;
246 phandle_start = qemu_opt_get(machine_opts, "phandle_start");
247 if (phandle_start) {
248 phandle = strtoul(phandle_start, NULL, 0);
249 }
250 }
251 }
252
253 if (!phandle) {
254 /*
255 * None or invalid phandle given on the command line, so fall back to
256 * default starting point.
257 */
258 phandle = 0x8000;
259 }
260
261 return phandle++;
262 }
263
264 int qemu_devtree_nop_node(void *fdt, const char *node_path)
265 {
266 int r;
267
268 r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
269 if (r < 0) {
270 fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path,
271 fdt_strerror(r));
272 exit(1);
273 }
274
275 return r;
276 }
277
278 int qemu_devtree_add_subnode(void *fdt, const char *name)
279 {
280 char *dupname = g_strdup(name);
281 char *basename = strrchr(dupname, '/');
282 int retval;
283 int parent = 0;
284
285 if (!basename) {
286 g_free(dupname);
287 return -1;
288 }
289
290 basename[0] = '\0';
291 basename++;
292
293 if (dupname[0]) {
294 parent = findnode_nofail(fdt, dupname);
295 }
296
297 retval = fdt_add_subnode(fdt, parent, basename);
298 if (retval < 0) {
299 fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,
300 fdt_strerror(retval));
301 exit(1);
302 }
303
304 g_free(dupname);
305 return retval;
306 }
307
308 void qemu_devtree_dumpdtb(void *fdt, int size)
309 {
310 QemuOpts *machine_opts;
311
312 machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
313 if (machine_opts) {
314 const char *dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");
315 if (dumpdtb) {
316 /* Dump the dtb to a file and quit */
317 exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
318 }
319 }
320
321 }