Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 | /*
* Functions to help device tree manipulation using libfdt.
* It also provides functions to read entries from device tree proc
* interface.
*
* Copyright 2008 IBM Corporation.
* Authors: Jerone Young <jyoung5@us.ibm.com>
* Hollis Blanchard <hollisb@us.ibm.com>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "config.h"
#include "qemu-common.h"
#include "sysemu/device_tree.h"
#include "sysemu/sysemu.h"
#include "hw/loader.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include <libfdt.h>
#define FDT_MAX_SIZE 0x10000
void *create_device_tree(int *sizep)
{
void *fdt;
int ret;
*sizep = FDT_MAX_SIZE;
fdt = g_malloc0(FDT_MAX_SIZE);
ret = fdt_create(fdt, FDT_MAX_SIZE);
if (ret < 0) {
goto fail;
}
ret = fdt_begin_node(fdt, "");
if (ret < 0) {
goto fail;
}
ret = fdt_end_node(fdt);
if (ret < 0) {
goto fail;
}
ret = fdt_finish(fdt);
if (ret < 0) {
goto fail;
}
ret = fdt_open_into(fdt, fdt, *sizep);
if (ret) {
fprintf(stderr, "Unable to copy device tree in memory\n");
exit(1);
}
return fdt;
fail:
fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
exit(1);
}
void *load_device_tree(const char *filename_path, int *sizep)
{
int dt_size;
int dt_file_load_size;
int ret;
void *fdt = NULL;
*sizep = 0;
dt_size = get_image_size(filename_path);
if (dt_size < 0) {
printf("Unable to get size of device tree file '%s'\n",
filename_path);
goto fail;
}
/* Expand to 2x size to give enough room for manipulation. */
dt_size += 10000;
dt_size *= 2;
/* First allocate space in qemu for device tree */
fdt = g_malloc0(dt_size);
dt_file_load_size = load_image(filename_path, fdt);
if (dt_file_load_size < 0) {
printf("Unable to open device tree file '%s'\n",
filename_path);
goto fail;
}
ret = fdt_open_into(fdt, fdt, dt_size);
if (ret) {
printf("Unable to copy device tree in memory\n");
goto fail;
}
/* Check sanity of device tree */
if (fdt_check_header(fdt)) {
printf ("Device tree file loaded into memory is invalid: %s\n",
filename_path);
goto fail;
}
*sizep = dt_size;
return fdt;
fail:
g_free(fdt);
return NULL;
}
static int findnode_nofail(void *fdt, const char *node_path)
{
int offset;
offset = fdt_path_offset(fdt, node_path);
if (offset < 0) {
fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path,
fdt_strerror(offset));
exit(1);
}
return offset;
}
int qemu_devtree_setprop(void *fdt, const char *node_path,
const char *property, const void *val_array, int size)
{
int r;
r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size);
if (r < 0) {
fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path,
property, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
const char *property, uint32_t val)
{
int r;
r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
if (r < 0) {
fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__,
node_path, property, val, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_devtree_setprop_u64(void *fdt, const char *node_path,
const char *property, uint64_t val)
{
val = cpu_to_be64(val);
return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val));
}
int qemu_devtree_setprop_string(void *fdt, const char *node_path,
const char *property, const char *string)
{
int r;
r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
if (r < 0) {
fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__,
node_path, property, string, fdt_strerror(r));
exit(1);
}
return r;
}
const void *qemu_devtree_getprop(void *fdt, const char *node_path,
const char *property, int *lenp)
{
int len;
const void *r;
if (!lenp) {
lenp = &len;
}
r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
if (!r) {
fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__,
node_path, property, fdt_strerror(*lenp));
exit(1);
}
return r;
}
uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path,
const char *property)
{
int len;
const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len);
if (len != 4) {
fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n",
__func__, node_path, property);
exit(1);
}
return be32_to_cpu(*p);
}
uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)
{
uint32_t r;
r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
if (r == 0) {
fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
path, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path)
{
uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path);
return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
}
uint32_t qemu_devtree_alloc_phandle(void *fdt)
{
static int phandle = 0x0;
/*
* We need to find out if the user gave us special instruction at
* which phandle id to start allocting phandles.
*/
if (!phandle) {
phandle = qemu_opt_get_number(qemu_get_machine_opts(),
"phandle_start", 0);
}
if (!phandle) {
/*
* None or invalid phandle given on the command line, so fall back to
* default starting point.
*/
phandle = 0x8000;
}
return phandle++;
}
int qemu_devtree_nop_node(void *fdt, const char *node_path)
{
int r;
r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
if (r < 0) {
fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path,
fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_devtree_add_subnode(void *fdt, const char *name)
{
char *dupname = g_strdup(name);
char *basename = strrchr(dupname, '/');
int retval;
int parent = 0;
if (!basename) {
g_free(dupname);
return -1;
}
basename[0] = '\0';
basename++;
if (dupname[0]) {
parent = findnode_nofail(fdt, dupname);
}
retval = fdt_add_subnode(fdt, parent, basename);
if (retval < 0) {
fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,
fdt_strerror(retval));
exit(1);
}
g_free(dupname);
return retval;
}
void qemu_devtree_dumpdtb(void *fdt, int size)
{
const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
if (dumpdtb) {
/* Dump the dtb to a file and quit */
exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
}
}
int qemu_devtree_setprop_sized_cells_from_array(void *fdt,
const char *node_path,
const char *property,
int numvalues,
uint64_t *values)
{
uint32_t *propcells;
uint64_t value;
int cellnum, vnum, ncells;
uint32_t hival;
propcells = g_new0(uint32_t, numvalues * 2);
cellnum = 0;
for (vnum = 0; vnum < numvalues; vnum++) {
ncells = values[vnum * 2];
if (ncells != 1 && ncells != 2) {
return -1;
}
value = values[vnum * 2 + 1];
hival = cpu_to_be32(value >> 32);
if (ncells > 1) {
propcells[cellnum++] = hival;
} else if (hival != 0) {
return -1;
}
propcells[cellnum++] = cpu_to_be32(value);
}
return qemu_devtree_setprop(fdt, node_path, property, propcells,
cellnum * sizeof(uint32_t));
}
|