xref: /openbmc/u-boot/lib/efi/efi_info.c (revision 6a7b52bc)
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 }
48