arch/powerpc/kernel/secure_boot.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 IBM Corporation
   4  * Author: Nayna Jain
   5  */
   6 #include <linux/types.h>
   7 #include <linux/of.h>
   8 #include <asm/secure_boot.h>
   9
  10 static struct device_node *get_ppc_fw_sb_node(void)
  11 {
  12         static const struct of_device_id ids[] = {
  13                 { .compatible = "ibm,secureboot", },
  14                 { .compatible = "ibm,secureboot-v1", },
  15                 { .compatible = "ibm,secureboot-v2", },
  16                 {},
  17         };
  18
  19         return of_find_matching_node(NULL, ids);
  20 }
  21
  22 bool is_ppc_secureboot_enabled(void)
  23 {
  24         struct device_node *node;
  25         bool enabled = false;
  26
  27         node = get_ppc_fw_sb_node();
  28         enabled = of_property_read_bool(node, "os-secureboot-enforcing");
  29
  30         of_node_put(node);
  31
  32         pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
  33
  34         return enabled;
  35 }
  36
  37 bool is_ppc_trustedboot_enabled(void)
  38 {
  39         struct device_node *node;
  40         bool enabled = false;
  41
  42         node = get_ppc_fw_sb_node();
  43         enabled = of_property_read_bool(node, "trusted-enabled");
  44
  45         of_node_put(node);
  46
  47         pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
  48
  49         return enabled;
  50 }