1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fdtdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com>
4 */
5
6 #include <stdint.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <ctype.h>
11
12 #include <fdt.h>
13 #include <libfdt_env.h>
14
15 #include "util.h"
16
17 #define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1))
18 #define PALIGN(p, a) ((void *)(ALIGN((unsigned long)(p), (a))))
19 #define GET_CELL(p) (p += 4, *((const uint32_t *)(p-4)))
20
print_data(const char * data,int len)21 static void print_data(const char *data, int len)
22 {
23 int i;
24 const char *p = data;
25
26 /* no data, don't print */
27 if (len == 0)
28 return;
29
30 if (util_is_printable_string(data, len)) {
31 printf(" = \"%s\"", (const char *)data);
32 } else if ((len % 4) == 0) {
33 printf(" = <");
34 for (i = 0; i < len; i += 4)
35 printf("0x%08x%s", fdt32_to_cpu(GET_CELL(p)),
36 i < (len - 4) ? " " : "");
37 printf(">");
38 } else {
39 printf(" = [");
40 for (i = 0; i < len; i++)
41 printf("%02x%s", *p++, i < len - 1 ? " " : "");
42 printf("]");
43 }
44 }
45
dump_blob(void * blob)46 static void dump_blob(void *blob)
47 {
48 struct fdt_header *bph = blob;
49 uint32_t off_mem_rsvmap = fdt32_to_cpu(bph->off_mem_rsvmap);
50 uint32_t off_dt = fdt32_to_cpu(bph->off_dt_struct);
51 uint32_t off_str = fdt32_to_cpu(bph->off_dt_strings);
52 struct fdt_reserve_entry *p_rsvmap =
53 (struct fdt_reserve_entry *)((char *)blob + off_mem_rsvmap);
54 const char *p_struct = (const char *)blob + off_dt;
55 const char *p_strings = (const char *)blob + off_str;
56 uint32_t version = fdt32_to_cpu(bph->version);
57 uint32_t totalsize = fdt32_to_cpu(bph->totalsize);
58 uint32_t tag;
59 const char *p, *s, *t;
60 int depth, sz, shift;
61 int i;
62 uint64_t addr, size;
63
64 depth = 0;
65 shift = 4;
66
67 printf("/dts-v1/;\n");
68 printf("// magic:\t\t0x%x\n", fdt32_to_cpu(bph->magic));
69 printf("// totalsize:\t\t0x%x (%d)\n", totalsize, totalsize);
70 printf("// off_dt_struct:\t0x%x\n", off_dt);
71 printf("// off_dt_strings:\t0x%x\n", off_str);
72 printf("// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
73 printf("// version:\t\t%d\n", version);
74 printf("// last_comp_version:\t%d\n",
75 fdt32_to_cpu(bph->last_comp_version));
76 if (version >= 2)
77 printf("// boot_cpuid_phys:\t0x%x\n",
78 fdt32_to_cpu(bph->boot_cpuid_phys));
79
80 if (version >= 3)
81 printf("// size_dt_strings:\t0x%x\n",
82 fdt32_to_cpu(bph->size_dt_strings));
83 if (version >= 17)
84 printf("// size_dt_struct:\t0x%x\n",
85 fdt32_to_cpu(bph->size_dt_struct));
86 printf("\n");
87
88 for (i = 0; ; i++) {
89 addr = fdt64_to_cpu(p_rsvmap[i].address);
90 size = fdt64_to_cpu(p_rsvmap[i].size);
91 if (addr == 0 && size == 0)
92 break;
93
94 printf("/memreserve/ %llx %llx;\n",
95 (unsigned long long)addr, (unsigned long long)size);
96 }
97
98 p = p_struct;
99 while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
100
101 /* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */
102
103 if (tag == FDT_BEGIN_NODE) {
104 s = p;
105 p = PALIGN(p + strlen(s) + 1, 4);
106
107 if (*s == '\0')
108 s = "/";
109
110 printf("%*s%s {\n", depth * shift, "", s);
111
112 depth++;
113 continue;
114 }
115
116 if (tag == FDT_END_NODE) {
117 depth--;
118
119 printf("%*s};\n", depth * shift, "");
120 continue;
121 }
122
123 if (tag == FDT_NOP) {
124 printf("%*s// [NOP]\n", depth * shift, "");
125 continue;
126 }
127
128 if (tag != FDT_PROP) {
129 fprintf(stderr, "%*s ** Unknown tag 0x%08x\n", depth * shift, "", tag);
130 break;
131 }
132 sz = fdt32_to_cpu(GET_CELL(p));
133 s = p_strings + fdt32_to_cpu(GET_CELL(p));
134 if (version < 16 && sz >= 8)
135 p = PALIGN(p, 8);
136 t = p;
137
138 p = PALIGN(p + sz, 4);
139
140 printf("%*s%s", depth * shift, "", s);
141 print_data(t, sz);
142 printf(";\n");
143 }
144 }
145
146
main(int argc,char * argv[])147 int main(int argc, char *argv[])
148 {
149 char *buf;
150
151 if (argc < 2) {
152 fprintf(stderr, "supply input filename\n");
153 return 5;
154 }
155
156 buf = utilfdt_read(argv[1]);
157 if (buf)
158 dump_blob(buf);
159 else
160 return 10;
161
162 return 0;
163 }
164