1/*
 2 * Copyright (C) 2017 Google, Inc.
 3 *     Thiebaud Weksteen <tweek@google.com>
 4 *
 5 * This program is free software; you can redistribute it and/or modify
 6 * it under the terms of the GNU General Public License version 2 as
 7 * published by the Free Software Foundation.
 8 */
 9
10#include <linux/efi.h>
11#include <linux/init.h>
12#include <linux/memblock.h>
13
14#include <asm/early_ioremap.h>
15
16/*
17 * Reserve the memory associated with the TPM Event Log configuration table.
18 */
19int __init efi_tpm_eventlog_init(void)
20{
21	struct linux_efi_tpm_eventlog *log_tbl;
22	unsigned int tbl_size;
23
24	if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
25		return 0;
26
27	log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
28	if (!log_tbl) {
29		pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
30			efi.tpm_log);
31		efi.tpm_log = EFI_INVALID_TABLE_ADDR;
32		return -ENOMEM;
33	}
34
35	tbl_size = sizeof(*log_tbl) + log_tbl->size;
36	memblock_reserve(efi.tpm_log, tbl_size);
37	early_memunmap(log_tbl, sizeof(*log_tbl));
38	return 0;
39}
40