s390x/sclpconsole-lm: Fix hanging SCLP line mode console
[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 "qemu/error-report.h"
24 #include "sysemu/device_tree.h"
25 #include "sysemu/sysemu.h"
26 #include "hw/loader.h"
27 #include "qemu/option.h"
28 #include "qemu/config-file.h"
29
30 #include <libfdt.h>
31
32 #define FDT_MAX_SIZE 0x10000
33
34 void *create_device_tree(int *sizep)
35 {
36 void *fdt;
37 int ret;
38
39 *sizep = FDT_MAX_SIZE;
40 fdt = g_malloc0(FDT_MAX_SIZE);
41 ret = fdt_create(fdt, FDT_MAX_SIZE);
42 if (ret < 0) {
43 goto fail;
44 }
45 ret = fdt_finish_reservemap(fdt);
46 if (ret < 0) {
47 goto fail;
48 }
49 ret = fdt_begin_node(fdt, "");
50 if (ret < 0) {
51 goto fail;
52 }
53 ret = fdt_end_node(fdt);
54 if (ret < 0) {
55 goto fail;
56 }
57 ret = fdt_finish(fdt);
58 if (ret < 0) {
59 goto fail;
60 }
61 ret = fdt_open_into(fdt, fdt, *sizep);
62 if (ret) {
63 error_report("Unable to copy device tree in memory");
64 exit(1);
65 }
66
67 return fdt;
68 fail:
69 error_report("%s Couldn't create dt: %s", __func__, fdt_strerror(ret));
70 exit(1);
71 }
72
73 void *load_device_tree(const char *filename_path, int *sizep)
74 {
75 int dt_size;
76 int dt_file_load_size;
77 int ret;
78 void *fdt = NULL;
79
80 *sizep = 0;
81 dt_size = get_image_size(filename_path);
82 if (dt_size < 0) {
83 error_report("Unable to get size of device tree file '%s'",
84 filename_path);
85 goto fail;
86 }
87
88 /* Expand to 2x size to give enough room for manipulation. */
89 dt_size += 10000;
90 dt_size *= 2;
91 /* First allocate space in qemu for device tree */
92 fdt = g_malloc0(dt_size);
93
94 dt_file_load_size = load_image(filename_path, fdt);
95 if (dt_file_load_size < 0) {
96 error_report("Unable to open device tree file '%s'",
97 filename_path);
98 goto fail;
99 }
100
101 ret = fdt_open_into(fdt, fdt, dt_size);
102 if (ret) {
103 error_report("Unable to copy device tree in memory");
104 goto fail;
105 }
106
107 /* Check sanity of device tree */
108 if (fdt_check_header(fdt)) {
109 error_report("Device tree file loaded into memory is invalid: %s",
110 filename_path);
111 goto fail;
112 }
113 *sizep = dt_size;
114 return fdt;
115
116 fail:
117 g_free(fdt);
118 return NULL;
119 }
120
121 static int findnode_nofail(void *fdt, const char *node_path)
122 {
123 int offset;
124
125 offset = fdt_path_offset(fdt, node_path);
126 if (offset < 0) {
127 error_report("%s Couldn't find node %s: %s", __func__, node_path,
128 fdt_strerror(offset));
129 exit(1);
130 }
131
132 return offset;
133 }
134
135 int qemu_fdt_setprop(void *fdt, const char *node_path,
136 const char *property, const void *val, int size)
137 {
138 int r;
139
140 r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
141 if (r < 0) {
142 error_report("%s: Couldn't set %s/%s: %s", __func__, node_path,
143 property, fdt_strerror(r));
144 exit(1);
145 }
146
147 return r;
148 }
149
150 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
151 const char *property, uint32_t val)
152 {
153 int r;
154
155 r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
156 if (r < 0) {
157 error_report("%s: Couldn't set %s/%s = %#08x: %s", __func__,
158 node_path, property, val, fdt_strerror(r));
159 exit(1);
160 }
161
162 return r;
163 }
164
165 int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
166 const char *property, uint64_t val)
167 {
168 val = cpu_to_be64(val);
169 return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
170 }
171
172 int qemu_fdt_setprop_string(void *fdt, const char *node_path,
173 const char *property, const char *string)
174 {
175 int r;
176
177 r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
178 if (r < 0) {
179 error_report("%s: Couldn't set %s/%s = %s: %s", __func__,
180 node_path, property, string, fdt_strerror(r));
181 exit(1);
182 }
183
184 return r;
185 }
186
187 const void *qemu_fdt_getprop(void *fdt, const char *node_path,
188 const char *property, int *lenp)
189 {
190 int len;
191 const void *r;
192 if (!lenp) {
193 lenp = &len;
194 }
195 r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
196 if (!r) {
197 error_report("%s: Couldn't get %s/%s: %s", __func__,
198 node_path, property, fdt_strerror(*lenp));
199 exit(1);
200 }
201 return r;
202 }
203
204 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
205 const char *property)
206 {
207 int len;
208 const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len);
209 if (len != 4) {
210 error_report("%s: %s/%s not 4 bytes long (not a cell?)",
211 __func__, node_path, property);
212 exit(1);
213 }
214 return be32_to_cpu(*p);
215 }
216
217 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
218 {
219 uint32_t r;
220
221 r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
222 if (r == 0) {
223 error_report("%s: Couldn't get phandle for %s: %s", __func__,
224 path, fdt_strerror(r));
225 exit(1);
226 }
227
228 return r;
229 }
230
231 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
232 const char *property,
233 const char *target_node_path)
234 {
235 uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
236 return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
237 }
238
239 uint32_t qemu_fdt_alloc_phandle(void *fdt)
240 {
241 static int phandle = 0x0;
242
243 /*
244 * We need to find out if the user gave us special instruction at
245 * which phandle id to start allocting phandles.
246 */
247 if (!phandle) {
248 phandle = qemu_opt_get_number(qemu_get_machine_opts(),
249 "phandle_start", 0);
250 }
251
252 if (!phandle) {
253 /*
254 * None or invalid phandle given on the command line, so fall back to
255 * default starting point.
256 */
257 phandle = 0x8000;
258 }
259
260 return phandle++;
261 }
262
263 int qemu_fdt_nop_node(void *fdt, const char *node_path)
264 {
265 int r;
266
267 r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
268 if (r < 0) {
269 error_report("%s: Couldn't nop node %s: %s", __func__, node_path,
270 fdt_strerror(r));
271 exit(1);
272 }
273
274 return r;
275 }
276
277 int qemu_fdt_add_subnode(void *fdt, const char *name)
278 {
279 char *dupname = g_strdup(name);
280 char *basename = strrchr(dupname, '/');
281 int retval;
282 int parent = 0;
283
284 if (!basename) {
285 g_free(dupname);
286 return -1;
287 }
288
289 basename[0] = '\0';
290 basename++;
291
292 if (dupname[0]) {
293 parent = findnode_nofail(fdt, dupname);
294 }
295
296 retval = fdt_add_subnode(fdt, parent, basename);
297 if (retval < 0) {
298 error_report("FDT: Failed to create subnode %s: %s", name,
299 fdt_strerror(retval));
300 exit(1);
301 }
302
303 g_free(dupname);
304 return retval;
305 }
306
307 void qemu_fdt_dumpdtb(void *fdt, int size)
308 {
309 const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
310
311 if (dumpdtb) {
312 /* Dump the dtb to a file and quit */
313 exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
314 }
315 }
316
317 int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
318 const char *node_path,
319 const char *property,
320 int numvalues,
321 uint64_t *values)
322 {
323 uint32_t *propcells;
324 uint64_t value;
325 int cellnum, vnum, ncells;
326 uint32_t hival;
327
328 propcells = g_new0(uint32_t, numvalues * 2);
329
330 cellnum = 0;
331 for (vnum = 0; vnum < numvalues; vnum++) {
332 ncells = values[vnum * 2];
333 if (ncells != 1 && ncells != 2) {
334 return -1;
335 }
336 value = values[vnum * 2 + 1];
337 hival = cpu_to_be32(value >> 32);
338 if (ncells > 1) {
339 propcells[cellnum++] = hival;
340 } else if (hival != 0) {
341 return -1;
342 }
343 propcells[cellnum++] = cpu_to_be32(value);
344 }
345
346 return qemu_fdt_setprop(fdt, node_path, property, propcells,
347 cellnum * sizeof(uint32_t));
348 }