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}