Merge branch 'x86-topology-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[muen/linux.git] / drivers / firmware / efi / tpm.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2017 Google, Inc.
4  *     Thiebaud Weksteen <tweek@google.com>
5  */
6
7 #include <linux/efi.h>
8 #include <linux/init.h>
9 #include <linux/memblock.h>
10
11 #include <asm/early_ioremap.h>
12
13 /*
14  * Reserve the memory associated with the TPM Event Log configuration table.
15  */
16 int __init efi_tpm_eventlog_init(void)
17 {
18         struct linux_efi_tpm_eventlog *log_tbl;
19         unsigned int tbl_size;
20
21         if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
22                 return 0;
23
24         log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
25         if (!log_tbl) {
26                 pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
27                         efi.tpm_log);
28                 efi.tpm_log = EFI_INVALID_TABLE_ADDR;
29                 return -ENOMEM;
30         }
31
32         tbl_size = sizeof(*log_tbl) + log_tbl->size;
33         memblock_reserve(efi.tpm_log, tbl_size);
34         early_memunmap(log_tbl, sizeof(*log_tbl));
35         return 0;
36 }
37