1 /* 2 * libfdt - Flat Device Tree manipulation 3 * Tests if two given dtbs are structurally equal (including order) 4 * Copyright (C) 2007 David Gibson, IBM Corporation. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public License 8 * as published by the Free Software Foundation; either version 2.1 of 9 * the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #include <stdlib.h> 22 #include <stdio.h> 23 #include <string.h> 24 #include <stdint.h> 25 26 #include <libfdt.h> 27 28 #include "tests.h" 29 #include "testdata.h" 30 31 static int notequal; /* = 0 */ 32 33 #define MISMATCH(fmt, ...) \ 34 do { \ 35 if (notequal) \ 36 PASS(); \ 37 else \ 38 FAIL(fmt, ##__VA_ARGS__); \ 39 } while (0) 40 41 #define MATCH() \ 42 do { \ 43 if (!notequal) \ 44 PASS(); \ 45 else \ 46 FAIL("Trees match which shouldn't"); \ 47 } while (0) 48 49 #define CHECK(code) \ 50 { \ 51 err = (code); \ 52 if (err) \ 53 FAIL(#code ": %s", fdt_strerror(err)); \ 54 } 55 56 static void compare_mem_rsv(const void *fdt1, const void *fdt2) 57 { 58 int i; 59 uint64_t addr1, size1, addr2, size2; 60 int err; 61 62 if (fdt_num_mem_rsv(fdt1) != fdt_num_mem_rsv(fdt2)) 63 MISMATCH("Trees have different number of reserve entries"); 64 for (i = 0; i < fdt_num_mem_rsv(fdt1); i++) { 65 CHECK(fdt_get_mem_rsv(fdt1, i, &addr1, &size1)); 66 CHECK(fdt_get_mem_rsv(fdt2, i, &addr2, &size2)); 67 68 if ((addr1 != addr2) || (size1 != size2)) 69 MISMATCH("Mismatch in reserve entry %d: " 70 "(0x%llx, 0x%llx) != (0x%llx, 0x%llx)", i, 71 (unsigned long long)addr1, 72 (unsigned long long)size1, 73 (unsigned long long)addr2, 74 (unsigned long long)size2); 75 } 76 } 77 78 static void compare_structure(const void *fdt1, const void *fdt2) 79 { 80 int nextoffset1 = 0, nextoffset2 = 0; 81 int offset1, offset2; 82 uint32_t tag1, tag2; 83 const char *name1, *name2; 84 int err; 85 const struct fdt_property *prop1, *prop2; 86 int len1, len2; 87 88 while (1) { 89 do { 90 offset1 = nextoffset1; 91 tag1 = fdt_next_tag(fdt1, offset1, &nextoffset1); 92 } while (tag1 == FDT_NOP); 93 do { 94 offset2 = nextoffset2; 95 tag2 = fdt_next_tag(fdt2, offset2, &nextoffset2); 96 } while (tag2 == FDT_NOP); 97 98 if (tag1 != tag2) 99 MISMATCH("Tag mismatch (%d != %d) at (%d, %d)", 100 tag1, tag2, offset1, offset2); 101 102 switch (tag1) { 103 case FDT_BEGIN_NODE: 104 name1 = fdt_get_name(fdt1, offset1, &err); 105 if (!name1) 106 FAIL("fdt_get_name(fdt1, %d, ..): %s", 107 offset1, fdt_strerror(err)); 108 name2 = fdt_get_name(fdt2, offset2, NULL); 109 if (!name2) 110 FAIL("fdt_get_name(fdt2, %d, ..): %s", 111 offset2, fdt_strerror(err)); 112 113 if (!streq(name1, name2)) 114 MISMATCH("Name mismatch (\"%s\" != \"%s\") at (%d, %d)", 115 name1, name2, offset1, offset2); 116 break; 117 118 case FDT_PROP: 119 prop1 = fdt_offset_ptr(fdt1, offset1, sizeof(*prop1)); 120 if (!prop1) 121 FAIL("Could get fdt1 property at %d", offset1); 122 prop2 = fdt_offset_ptr(fdt2, offset2, sizeof(*prop2)); 123 if (!prop2) 124 FAIL("Could get fdt2 property at %d", offset2); 125 126 name1 = fdt_string(fdt1, fdt32_to_cpu(prop1->nameoff)); 127 name2 = fdt_string(fdt2, fdt32_to_cpu(prop2->nameoff)); 128 if (!streq(name1, name2)) 129 MISMATCH("Property name mismatch \"%s\" != \"%s\" " 130 "at (%d, %d)", name1, name2, offset1, offset2); 131 len1 = fdt32_to_cpu(prop1->len); 132 len2 = fdt32_to_cpu(prop2->len); 133 if (len1 != len2) 134 MISMATCH("Property length mismatch %u != %u " 135 "at (%d, %d)", len1, len2, offset1, offset2); 136 137 if (memcmp(prop1->data, prop2->data, len1) != 0) 138 MISMATCH("Property value mismatch at (%d, %d)", 139 offset1, offset2); 140 break; 141 142 case FDT_END: 143 return; 144 } 145 } 146 } 147 148 int main(int argc, char *argv[]) 149 { 150 void *fdt1, *fdt2; 151 uint32_t cpuid1, cpuid2; 152 153 test_init(argc, argv); 154 if ((argc != 3) 155 && ((argc != 4) || !streq(argv[1], "-n"))) 156 CONFIG("Usage: %s [-n] <dtb file> <dtb file>", argv[0]); 157 if (argc == 4) 158 notequal = 1; 159 160 fdt1 = load_blob(argv[argc-2]); 161 fdt2 = load_blob(argv[argc-1]); 162 163 compare_mem_rsv(fdt1, fdt2); 164 compare_structure(fdt1, fdt2); 165 166 cpuid1 = fdt_boot_cpuid_phys(fdt1); 167 cpuid2 = fdt_boot_cpuid_phys(fdt2); 168 if (cpuid1 != cpuid2) 169 MISMATCH("boot_cpuid_phys mismatch 0x%x != 0x%x", 170 cpuid1, cpuid2); 171 172 MATCH(); 173 } 174
