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