LXR uboot/lib/efi/efi

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (c) 2015 Google, Inc
   4 *
   5 * Access to the EFI information table
   6 */
   7
   8#include <common.h>
   9#include <efi.h>
  10#include <errno.h>
  11#include <mapmem.h>
  12#include <asm/global_data.h>
  13
  14int 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;
  43err:
  44        unmap_sysmem(info);
  45
  46        return ret;
  47}
  48