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
|
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <libfdt.h>
#include <stdio.h>
#include <stdlib.h>
#include "kexec.h"
#include "dt-ops.h"
static const char n_chosen[] = "/chosen";
static const char p_bootargs[] = "bootargs";
static const char p_initrd_start[] = "linux,initrd-start";
static const char p_initrd_end[] = "linux,initrd-end";
int dtb_set_initrd(char **dtb, off_t *dtb_size, off_t start, off_t end)
{
int result;
uint64_t value;
dbgprintf("%s: start %jd, end %jd, size %jd (%jd KiB)\n",
__func__, (intmax_t)start, (intmax_t)end,
(intmax_t)(end - start),
(intmax_t)(end - start) / 1024);
value = cpu_to_fdt64(start);
result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_start,
&value, sizeof(value));
if (result)
return result;
value = cpu_to_fdt64(end);
result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_end,
&value, sizeof(value));
if (result) {
dtb_delete_property(*dtb, n_chosen, p_initrd_start);
return result;
}
return 0;
}
int dtb_set_bootargs(char **dtb, off_t *dtb_size, const char *command_line)
{
return dtb_set_property(dtb, dtb_size, n_chosen, p_bootargs,
command_line, strlen(command_line) + 1);
}
int dtb_set_property(char **dtb, off_t *dtb_size, const char *node,
const char *prop, const void *value, int value_len)
{
int result;
int nodeoffset;
void *new_dtb;
int new_size;
value_len = FDT_TAGALIGN(value_len);
new_size = FDT_TAGALIGN(*dtb_size + fdt_node_len(node)
+ fdt_prop_len(prop, value_len));
new_dtb = malloc(new_size);
if (!new_dtb) {
dbgprintf("%s: malloc failed\n", __func__);
return -ENOMEM;
}
result = fdt_open_into(*dtb, new_dtb, new_size);
if (result) {
dbgprintf("%s: fdt_open_into failed: %s\n", __func__,
fdt_strerror(result));
goto on_error;
}
nodeoffset = fdt_path_offset(new_dtb, node);
if (nodeoffset == -FDT_ERR_NOTFOUND) {
result = fdt_add_subnode(new_dtb, nodeoffset, node);
if (result) {
dbgprintf("%s: fdt_add_subnode failed: %s\n", __func__,
fdt_strerror(result));
goto on_error;
}
} else if (nodeoffset < 0) {
dbgprintf("%s: fdt_path_offset failed: %s\n", __func__,
fdt_strerror(nodeoffset));
goto on_error;
}
result = fdt_setprop(new_dtb, nodeoffset, prop, value, value_len);
if (result) {
dbgprintf("%s: fdt_setprop failed: %s\n", __func__,
fdt_strerror(result));
goto on_error;
}
/*
* Can't call free on dtb since dtb may have been mmaped by
* slurp_file().
*/
result = fdt_pack(new_dtb);
if (result)
dbgprintf("%s: Unable to pack device tree: %s\n", __func__,
fdt_strerror(result));
*dtb = new_dtb;
*dtb_size = fdt_totalsize(*dtb);
return 0;
on_error:
free(new_dtb);
return result;
}
int dtb_delete_property(char *dtb, const char *node, const char *prop)
{
int result;
int nodeoffset = fdt_path_offset(dtb, node);
if (nodeoffset < 0) {
dbgprintf("%s: fdt_path_offset failed: %s\n", __func__,
fdt_strerror(nodeoffset));
return nodeoffset;
}
result = fdt_delprop(dtb, nodeoffset, prop);
if (result)
dbgprintf("%s: fdt_delprop failed: %s\n", __func__,
fdt_strerror(nodeoffset));
return result;
}
|
