LXR linux/arch/powerpc/kernel/secure

   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
  10static 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
  22bool 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
  38out:
  39        pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
  40
  41        return enabled;
  42}
  43
  44bool 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
  60out:
  61        pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
  62
  63        return enabled;
  64}
  65