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         u32 secureboot;
  27
  28         node = get_ppc_fw_sb_node();
  29         enabled = of_property_read_bool(node, "os-secureboot-enforcing");
  30         of_node_put(node);
  31
  32         if (enabled)
  33                 goto out;
  34
  35         if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot))
  36                 enabled = (secureboot > 1);
  37
  38 out:
  39         pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
  40
  41         return enabled;
  42 }
  43
  44 bool is_ppc_trustedboot_enabled(void)
  45 {
  46         struct device_node *node;
  47         bool enabled = false;
  48         u32 trustedboot;
  49
  50         node = get_ppc_fw_sb_node();
  51         enabled = of_property_read_bool(node, "trusted-enabled");
  52         of_node_put(node);
  53
  54         if (enabled)
  55                 goto out;
  56
  57         if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot))
  58                 enabled = (trustedboot > 0);
  59
  60 out:
  61         pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
  62
  63         return enabled;
  64 }