/*
   * Copyright (c) 2015 Google, Inc
   *
   * SPDX-License-Identifier:	GPL-2.0+
   *
   * Access to the EFI information table
   */
  
  #include <common.h>
  #include <efi.h>
  #include <errno.h>
  #include <mapmem.h>
  
  int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
  {
  	struct efi_entry_hdr *entry;
  	struct efi_info_hdr *info;
  	int ret;
  
  	if (!gd->arch.table)
  		return -ENODATA;
  
  	info = map_sysmem(gd->arch.table, 0);
  	if (info->version != EFI_TABLE_VERSION) {
  		ret = -EPROTONOSUPPORT;
  		goto err;
  	}
  
  	entry = (struct efi_entry_hdr *)((ulong)info + info->hdr_size);
  	while (entry->type != EFIET_END) {
  		if (entry->type == type) {
  			if (entry->addr)
  				*datap = map_sysmem(entry->addr, entry->size);
  			else
  				*datap = entry + 1;
  			*sizep = entry->size;
  			return 0;
  		}
  		entry = (struct efi_entry_hdr *)((ulong)entry + entry->link);
  	}
  
  	ret = -ENOENT;
  err:
  	unmap_sysmem(info);
  
  	return ret;
  }