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 <efi.h>
9#include <errno.h>
10#include <mapmem.h>
11#include <asm/global_data.h>
12
13int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
14{
15	struct efi_entry_hdr *entry;
16	struct efi_info_hdr *info;
17	int ret;
18
19	if (!gd->arch.table)
20		return -ENODATA;
21
22	info = map_sysmem(gd->arch.table, 0);
23	if (info->version != EFI_TABLE_VERSION) {
24		ret = -EPROTONOSUPPORT;
25		goto err;
26	}
27
28	entry = (struct efi_entry_hdr *)((ulong)info + info->hdr_size);
29	while (entry->type != EFIET_END) {
30		if (entry->type == type) {
31			if (entry->addr)
32				*datap = map_sysmem(entry->addr, entry->size);
33			else
34				*datap = entry + 1;
35			*sizep = entry->size;
36			return 0;
37		}
38		entry = (struct efi_entry_hdr *)((ulong)entry + entry->link);
39	}
40
41	ret = -ENOENT;
42err:
43	unmap_sysmem(info);
44
45	return ret;
46}
47