drivers/firmware/efi/tpm.c

   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  */
  19 int __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