Skip to content
Newer
Older
100644 111 lines (91 sloc) 2.63 KB
68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored Jun 24, 2011
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.h"
24 #include "device_tree.h"
25 #include "hw/loader.h"
26
27 #include <libfdt.h>
28
29 void *load_device_tree(const char *filename_path, int *sizep)
30 {
31 int dt_size;
32 int dt_file_load_size;
33 int ret;
34 void *fdt = NULL;
35
36 *sizep = 0;
37 dt_size = get_image_size(filename_path);
38 if (dt_size < 0) {
39 printf("Unable to get size of device tree file '%s'\n",
40 filename_path);
41 goto fail;
42 }
43
44 /* Expand to 2x size to give enough room for manipulation. */
45 dt_size *= 2;
46 /* First allocate space in qemu for device tree */
47 fdt = qemu_mallocz(dt_size);
48
49 dt_file_load_size = load_image(filename_path, fdt);
50 if (dt_file_load_size < 0) {
51 printf("Unable to open device tree file '%s'\n",
52 filename_path);
53 goto fail;
54 }
55
56 ret = fdt_open_into(fdt, fdt, dt_size);
57 if (ret) {
58 printf("Unable to copy device tree in memory\n");
59 goto fail;
60 }
61
62 /* Check sanity of device tree */
63 if (fdt_check_header(fdt)) {
64 printf ("Device tree file loaded into memory is invalid: %s\n",
65 filename_path);
66 goto fail;
67 }
68 *sizep = dt_size;
69 return fdt;
70
71 fail:
72 qemu_free(fdt);
73 return NULL;
74 }
75
76 int qemu_devtree_setprop(void *fdt, const char *node_path,
77 const char *property, uint32_t *val_array, int size)
78 {
79 int offset;
80
81 offset = fdt_path_offset(fdt, node_path);
82 if (offset < 0)
83 return offset;
84
85 return fdt_setprop(fdt, offset, property, val_array, size);
86 }
87
88 int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
89 const char *property, uint32_t val)
90 {
91 int offset;
92
93 offset = fdt_path_offset(fdt, node_path);
94 if (offset < 0)
95 return offset;
96
97 return fdt_setprop_cell(fdt, offset, property, val);
98 }
99
100 int qemu_devtree_setprop_string(void *fdt, const char *node_path,
101 const char *property, const char *string)
102 {
103 int offset;
104
105 offset = fdt_path_offset(fdt, node_path);
106 if (offset < 0)
107 return offset;
108
109 return fdt_setprop_string(fdt, offset, property, string);
110 }
Something went wrong with that request. Please try again.