cmd/efi.c

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