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// SPDX-License-Identifier: GPL-2.0 /* * fdtdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com> */ #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> #include <fdt.h> #include <libfdt_env.h> #include "util.h" #define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1)) #define PALIGN(p, a) ((void *)(ALIGN((unsigned long)(p), (a)))) #define GET_CELL(p) (p += 4, *((const uint32_t *)(p-4))) static void print_data(const char *data, int len) { int i; const char *p = data; /* no data, don't print */ if (len == 0) return; if (util_is_printable_string(data, len)) { printf(" = \"%s\"", (const char *)data); } else if ((len % 4) == 0) { printf(" = <"); for (i = 0; i < len; i += 4) printf("0x%08x%s", fdt32_to_cpu(GET_CELL(p)), i < (len - 4) ? " " : ""); printf(">"); } else { printf(" = ["); for (i = 0; i < len; i++) printf("%02x%s", *p++, i < len - 1 ? " " : ""); printf("]"); } } static void dump_blob(void *blob) { struct fdt_header *bph = blob; uint32_t off_mem_rsvmap = fdt32_to_cpu(bph->off_mem_rsvmap); uint32_t off_dt = fdt32_to_cpu(bph->off_dt_struct); uint32_t off_str = fdt32_to_cpu(bph->off_dt_strings); struct fdt_reserve_entry *p_rsvmap = (struct fdt_reserve_entry *)((char *)blob + off_mem_rsvmap); const char *p_struct = (const char *)blob + off_dt; const char *p_strings = (const char *)blob + off_str; uint32_t version = fdt32_to_cpu(bph->version); uint32_t totalsize = fdt32_to_cpu(bph->totalsize); uint32_t tag; const char *p, *s, *t; int depth, sz, shift; int i; uint64_t addr, size; depth = 0; shift = 4; printf("/dts-v1/;\n"); printf("// magic:\t\t0x%x\n", fdt32_to_cpu(bph->magic)); printf("// totalsize:\t\t0x%x (%d)\n", totalsize, totalsize); printf("// off_dt_struct:\t0x%x\n", off_dt); printf("// off_dt_strings:\t0x%x\n", off_str); printf("// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap); printf("// version:\t\t%d\n", version); printf("// last_comp_version:\t%d\n", fdt32_to_cpu(bph->last_comp_version)); if (version >= 2) printf("// boot_cpuid_phys:\t0x%x\n", fdt32_to_cpu(bph->boot_cpuid_phys)); if (version >= 3) printf("// size_dt_strings:\t0x%x\n", fdt32_to_cpu(bph->size_dt_strings)); if (version >= 17) printf("// size_dt_struct:\t0x%x\n", fdt32_to_cpu(bph->size_dt_struct)); printf("\n"); for (i = 0; ; i++) { addr = fdt64_to_cpu(p_rsvmap[i].address); size = fdt64_to_cpu(p_rsvmap[i].size); if (addr == 0 && size == 0) break; printf("/memreserve/ %llx %llx;\n", (unsigned long long)addr, (unsigned long long)size); } p = p_struct; while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) { /* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */ if (tag == FDT_BEGIN_NODE) { s = p; p = PALIGN(p + strlen(s) + 1, 4); if (*s == '\0') s = "/"; printf("%*s%s {\n", depth * shift, "", s); depth++; continue; } if (tag == FDT_END_NODE) { depth--; printf("%*s};\n", depth * shift, ""); continue; } if (tag == FDT_NOP) { printf("%*s// [NOP]\n", depth * shift, ""); continue; } if (tag != FDT_PROP) { fprintf(stderr, "%*s ** Unknown tag 0x%08x\n", depth * shift, "", tag); break; } sz = fdt32_to_cpu(GET_CELL(p)); s = p_strings + fdt32_to_cpu(GET_CELL(p)); if (version < 16 && sz >= 8) p = PALIGN(p, 8); t = p; p = PALIGN(p + sz, 4); printf("%*s%s", depth * shift, "", s); print_data(t, sz); printf(";\n"); } } int main(int argc, char *argv[]) { char *buf; if (argc < 2) { fprintf(stderr, "supply input filename\n"); return 5; } buf = utilfdt_read(argv[1]); if (buf) dump_blob(buf); else return 10; return 0; }
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