lib/efi/efi_info.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  *
   6  * Access to the EFI information table
   7  */
   8
   9 #include <common.h>
  10 #include <efi.h>
  11 #include <errno.h>
  12 #include <mapmem.h>
  13
  14 int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
  15 {
  16         struct efi_entry_hdr *entry;
  17         struct efi_info_hdr *info;
  18         int ret;
  19
  20         if (!gd->arch.table)
  21                 return -ENODATA;
  22
  23         info = map_sysmem(gd->arch.table, 0);
  24         if (info->version != EFI_TABLE_VERSION) {
  25                 ret = -EPROTONOSUPPORT;
  26                 goto err;
  27         }
  28
  29         entry = (struct efi_entry_hdr *)((ulong)info + info->hdr_size);
  30         while (entry->type != EFIET_END) {
  31                 if (entry->type == type) {
  32                         if (entry->addr)
  33                                 *datap = map_sysmem(entry->addr, entry->size);
  34                         else
  35                                 *datap = entry + 1;
  36                         *sizep = entry->size;
  37                         return 0;
  38                 }
  39                 entry = (struct efi_entry_hdr *)((ulong)entry + entry->link);
  40         }
  41
  42         ret = -ENOENT;
  43 err:
  44         unmap_sysmem(info);
  45
  46         return ret;
  47 }