cmd/efi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015 Google, Inc
   4  * Written by Simon Glass <[email protected]>
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <efi.h>
  10 #include <errno.h>
  11 #include <log.h>
  12 #include <malloc.h>
  13 #include <sort.h>
  14
  15 static const char *const type_name[] = {
  16         "reserved",
  17         "loader_code",
  18         "loader_data",
  19         "bs_code",
  20         "bs_data",
  21         "rt_code",
  22         "rt_data",
  23         "conv",
  24         "unusable",
  25         "acpi_reclaim",
  26         "acpi_nvs",
  27         "io",
  28         "io_port",
  29         "pal_code",
  30 };
  31
  32 static struct attr_info {
  33         u64 val;
  34         const char *name;
  35 } mem_attr[] = {
  36         { EFI_MEMORY_UC, "uncached" },
  37         { EFI_MEMORY_WC, "write-coalescing" },
  38         { EFI_MEMORY_WT, "write-through" },
  39         { EFI_MEMORY_WB, "write-back" },
  40         { EFI_MEMORY_UCE, "uncached & exported" },
  41         { EFI_MEMORY_WP, "write-protect" },
  42         { EFI_MEMORY_RP, "read-protect" },
  43         { EFI_MEMORY_XP, "execute-protect" },
  44         { EFI_MEMORY_NV, "non-volatile" },
  45         { EFI_MEMORY_MORE_RELIABLE, "higher reliability" },
  46         { EFI_MEMORY_RO, "read-only" },
  47         { EFI_MEMORY_RUNTIME, "needs runtime mapping" }
  48 };
  49
  50 /* Maximum different attribute values we can track */
  51 #define ATTR_SEEN_MAX   30
  52
  53 static inline bool is_boot_services(int type)
  54 {
  55         return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
  56                 type == EFI_BOOT_SERVICES_CODE ||
  57                 type == EFI_BOOT_SERVICES_DATA;
  58 }
  59
  60 static int h_cmp_entry(const void *v1, const void *v2)
  61 {
  62         const struct efi_mem_desc *desc1 = v1;
  63         const struct efi_mem_desc *desc2 = v2;
  64         int64_t diff = desc1->physical_start - desc2->physical_start;
  65
  66         /*
  67          * Manually calculate the difference to avoid sign loss in the 64-bit
  68          * to 32-bit conversion
  69          */
  70         return diff < 0 ? -1 : diff > 0 ? 1 : 0;
  71 }
  72
  73 void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs)
  74 {
  75         struct efi_mem_desc *desc, *end, *base, *dest, *prev;
  76         int count;
  77         u64 addr;
  78
  79         base = malloc(size + sizeof(*desc));
  80         if (!base) {
  81                 debug("%s: Cannot allocate %#x bytes\n", __func__, size);
  82                 return NULL;
  83         }
  84         end = (struct efi_mem_desc *)((ulong)map + size);
  85         count = ((ulong)end - (ulong)map->desc) / map->desc_size;
  86         memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
  87         qsort(base, count, map->desc_size, h_cmp_entry);
  88         prev = NULL;
  89         addr = 0;
  90         dest = base;
  91         end = (struct efi_mem_desc *)((ulong)base + count * map->desc_size);
  92         for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
  93                 bool merge = true;
  94                 int type = desc->type;
  95
  96                 if (skip_bs && is_boot_services(desc->type))
  97                         type = EFI_CONVENTIONAL_MEMORY;
  98
  99                 memcpy(dest, desc, map->desc_size);
 100                 dest->type = type;
 101                 if (!skip_bs || !prev)
 102                         merge = false;
 103                 else if (desc->physical_start != addr)
 104                         merge = false;
 105                 else if (type != EFI_CONVENTIONAL_MEMORY)
 106                         merge = false;
 107                 else if (prev->type != EFI_CONVENTIONAL_MEMORY)
 108                         merge = false;
 109
 110                 if (merge) {
 111                         prev->num_pages += desc->num_pages;
 112                 } else {
 113                         prev = dest;
 114                         dest = efi_get_next_mem_desc(map, dest);
 115                 }
 116                 addr = desc->physical_start + (desc->num_pages <<
 117                                 EFI_PAGE_SHIFT);
 118         }
 119
 120         /* Mark the end */
 121         dest->type = EFI_TABLE_END;
 122
 123         return base;
 124 }
 125
 126 static void efi_print_mem_table(struct efi_entry_memmap *map,
 127                                 struct efi_mem_desc *desc, bool skip_bs)
 128 {
 129         u64 attr_seen[ATTR_SEEN_MAX];
 130         int attr_seen_count;
 131         int upto, i;
 132         u64 addr;
 133
 134         printf(" #  %-14s  %10s  %10s  %10s  %s\n", "Type", "Physical",
 135                "Virtual", "Size", "Attributes");
 136
 137         /* Keep track of all the different attributes we have seen */
 138         attr_seen_count = 0;
 139         addr = 0;
 140         for (upto = 0; desc->type != EFI_TABLE_END;
 141              upto++, desc = efi_get_next_mem_desc(map, desc)) {
 142                 const char *name;
 143                 u64 size;
 144
 145                 if (skip_bs && is_boot_services(desc->type))
 146                         continue;
 147                 if (desc->physical_start != addr) {
 148                         printf("    %-14s  %010llx  %10s  %010llx\n", "<gap>",
 149                                addr, "", desc->physical_start - addr);
 150                 }
 151                 size = desc->num_pages << EFI_PAGE_SHIFT;
 152
 153                 name = desc->type < ARRAY_SIZE(type_name) ?
 154                                 type_name[desc->type] : "<invalid>";
 155                 printf("%2d  %x:%-12s  %010llx  %010llx  %010llx  ", upto,
 156                        desc->type, name, desc->physical_start,
 157                        desc->virtual_start, size);
 158                 if (desc->attribute & EFI_MEMORY_RUNTIME)
 159                         putc('r');
 160                 printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
 161                 putc('\n');
 162
 163                 for (i = 0; i < attr_seen_count; i++) {
 164                         if (attr_seen[i] == desc->attribute)
 165                                 break;
 166                 }
 167                 if (i == attr_seen_count && i < ATTR_SEEN_MAX)
 168                         attr_seen[attr_seen_count++] = desc->attribute;
 169                 addr = desc->physical_start + size;
 170         }
 171
 172         printf("\nAttributes key:\n");
 173         for (i = 0; i < attr_seen_count; i++) {
 174                 u64 attr = attr_seen[i];
 175                 bool first;
 176                 int j;
 177
 178                 printf("%c%llx: ", (attr & EFI_MEMORY_RUNTIME) ? 'r' : ' ',
 179                        attr & ~EFI_MEMORY_RUNTIME);
 180                 for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
 181                         if (attr & mem_attr[j].val) {
 182                                 if (first)
 183                                         first = false;
 184                                 else
 185                                         printf(", ");
 186                                 printf("%s", mem_attr[j].name);
 187                         }
 188                 }
 189                 putc('\n');
 190         }
 191         if (skip_bs)
 192                 printf("*Some areas are merged (use 'all' to see)\n");
 193 }
 194
 195 static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
 196                       char *const argv[])
 197 {
 198         struct efi_mem_desc *desc;
 199         struct efi_entry_memmap *map;
 200         int size, ret;
 201         bool skip_bs;
 202
 203         skip_bs = !argc || *argv[0] != 'a';
 204         ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
 205         switch (ret) {
 206         case -ENOENT:
 207                 printf("No EFI table available\n");
 208                 goto done;
 209         case -EPROTONOSUPPORT:
 210                 printf("Incorrect EFI table version\n");
 211                 goto done;
 212         }
 213         printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
 214                gd->arch.table, map, size, map->version, map->desc_size);
 215         if (map->version != EFI_MEM_DESC_VERSION) {
 216                 printf("Incorrect memory map version\n");
 217                 ret = -EPROTONOSUPPORT;
 218                 goto done;
 219         }
 220
 221         desc = efi_build_mem_table(map, size, skip_bs);
 222         if (!desc) {
 223                 ret = -ENOMEM;
 224                 goto done;
 225         }
 226
 227         efi_print_mem_table(map, desc, skip_bs);
 228         free(desc);
 229 done:
 230         if (ret)
 231                 printf("Error: %d\n", ret);
 232
 233         return ret ? CMD_RET_FAILURE : 0;
 234 }
 235
 236 static struct cmd_tbl efi_commands[] = {
 237         U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
 238 };
 239
 240 static int do_efi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 241 {
 242         struct cmd_tbl *efi_cmd;
 243         int ret;
 244
 245         if (argc < 2)
 246                 return CMD_RET_USAGE;
 247         efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
 248         argc -= 2;
 249         argv += 2;
 250         if (!efi_cmd || argc > efi_cmd->maxargs)
 251                 return CMD_RET_USAGE;
 252
 253         ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
 254
 255         return cmd_process_error(efi_cmd, ret);
 256 }
 257
 258 U_BOOT_CMD(
 259         efi,     3,      1,      do_efi,
 260         "EFI access",
 261         "mem [all]        Dump memory information [include boot services]"
 262 );