1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2018 Linaro Ltd.
4 * Sam Protsenko <semen.protsenko@linaro.org>
5 */
6
7 #include <image-android-dt.h>
8 #include <dt_table.h>
9 #include <common.h>
10 #include <linux/libfdt.h>
11 #include <mapmem.h>
12
13 /**
14 * Check if image header is correct.
15 *
16 * @param hdr_addr Start address of DT image
17 * @return true if header is correct or false if header is incorrect
18 */
android_dt_check_header(ulong hdr_addr)19 bool android_dt_check_header(ulong hdr_addr)
20 {
21 const struct dt_table_header *hdr;
22 u32 magic;
23
24 hdr = map_sysmem(hdr_addr, sizeof(*hdr));
25 magic = fdt32_to_cpu(hdr->magic);
26 unmap_sysmem(hdr);
27
28 return magic == DT_TABLE_MAGIC;
29 }
30
31 /**
32 * Get the address of FDT (dtb or dtbo) in memory by its index in image.
33 *
34 * @param hdr_addr Start address of DT image
35 * @param index Index of desired FDT in image (starting from 0)
36 * @param[out] addr If not NULL, will contain address to specified FDT
37 * @param[out] size If not NULL, will contain size of specified FDT
38 *
39 * @return true on success or false on error
40 */
android_dt_get_fdt_by_index(ulong hdr_addr,u32 index,ulong * addr,u32 * size)41 bool android_dt_get_fdt_by_index(ulong hdr_addr, u32 index, ulong *addr,
42 u32 *size)
43 {
44 const struct dt_table_header *hdr;
45 const struct dt_table_entry *e;
46 u32 entry_count, entries_offset, entry_size;
47 ulong e_addr;
48 u32 dt_offset, dt_size;
49
50 hdr = map_sysmem(hdr_addr, sizeof(*hdr));
51 entry_count = fdt32_to_cpu(hdr->dt_entry_count);
52 entries_offset = fdt32_to_cpu(hdr->dt_entries_offset);
53 entry_size = fdt32_to_cpu(hdr->dt_entry_size);
54 unmap_sysmem(hdr);
55
56 if (index >= entry_count) {
57 printf("Error: index >= dt_entry_count (%u >= %u)\n", index,
58 entry_count);
59 return false;
60 }
61
62 e_addr = hdr_addr + entries_offset + index * entry_size;
63 e = map_sysmem(e_addr, sizeof(*e));
64 dt_offset = fdt32_to_cpu(e->dt_offset);
65 dt_size = fdt32_to_cpu(e->dt_size);
66 unmap_sysmem(e);
67
68 if (addr)
69 *addr = hdr_addr + dt_offset;
70 if (size)
71 *size = dt_size;
72
73 return true;
74 }
75
76 #if !defined(CONFIG_SPL_BUILD)
android_dt_print_fdt_info(const struct fdt_header * fdt)77 static void android_dt_print_fdt_info(const struct fdt_header *fdt)
78 {
79 u32 fdt_size;
80 int root_node_off;
81 const char *compatible;
82
83 root_node_off = fdt_path_offset(fdt, "/");
84 if (root_node_off < 0) {
85 printf("Error: Root node not found\n");
86 return;
87 }
88
89 fdt_size = fdt_totalsize(fdt);
90 compatible = fdt_getprop(fdt, root_node_off, "compatible",
91 NULL);
92
93 printf(" (FDT)size = %d\n", fdt_size);
94 printf(" (FDT)compatible = %s\n",
95 compatible ? compatible : "(unknown)");
96 }
97
98 /**
99 * Print information about DT image structure.
100 *
101 * @param hdr_addr Start address of DT image
102 */
android_dt_print_contents(ulong hdr_addr)103 void android_dt_print_contents(ulong hdr_addr)
104 {
105 const struct dt_table_header *hdr;
106 u32 entry_count, entries_offset, entry_size;
107 u32 i;
108
109 hdr = map_sysmem(hdr_addr, sizeof(*hdr));
110 entry_count = fdt32_to_cpu(hdr->dt_entry_count);
111 entries_offset = fdt32_to_cpu(hdr->dt_entries_offset);
112 entry_size = fdt32_to_cpu(hdr->dt_entry_size);
113
114 /* Print image header info */
115 printf("dt_table_header:\n");
116 printf(" magic = %08x\n", fdt32_to_cpu(hdr->magic));
117 printf(" total_size = %d\n", fdt32_to_cpu(hdr->total_size));
118 printf(" header_size = %d\n", fdt32_to_cpu(hdr->header_size));
119 printf(" dt_entry_size = %d\n", entry_size);
120 printf(" dt_entry_count = %d\n", entry_count);
121 printf(" dt_entries_offset = %d\n", entries_offset);
122 printf(" page_size = %d\n", fdt32_to_cpu(hdr->page_size));
123 printf(" version = %d\n", fdt32_to_cpu(hdr->version));
124
125 unmap_sysmem(hdr);
126
127 /* Print image entries info */
128 for (i = 0; i < entry_count; ++i) {
129 const ulong e_addr = hdr_addr + entries_offset + i * entry_size;
130 const struct dt_table_entry *e;
131 const struct fdt_header *fdt;
132 u32 dt_offset, dt_size;
133 u32 j;
134
135 e = map_sysmem(e_addr, sizeof(*e));
136 dt_offset = fdt32_to_cpu(e->dt_offset);
137 dt_size = fdt32_to_cpu(e->dt_size);
138
139 printf("dt_table_entry[%d]:\n", i);
140 printf(" dt_size = %d\n", dt_size);
141 printf(" dt_offset = %d\n", dt_offset);
142 printf(" id = %08x\n", fdt32_to_cpu(e->id));
143 printf(" rev = %08x\n", fdt32_to_cpu(e->rev));
144 for (j = 0; j < 4; ++j) {
145 printf(" custom[%d] = %08x\n", j,
146 fdt32_to_cpu(e->custom[j]));
147 }
148
149 unmap_sysmem(e);
150
151 /* Print FDT info for this entry */
152 fdt = map_sysmem(hdr_addr + dt_offset, sizeof(*fdt));
153 android_dt_print_fdt_info(fdt);
154 unmap_sysmem(fdt);
155 }
156 }
157 #endif
158