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 <linux/string_choices.h>
9 #include <asm/secure_boot.h>
10
get_ppc_fw_sb_node(void)11 static struct device_node *get_ppc_fw_sb_node(void)
12 {
13 static const struct of_device_id ids[] = {
14 { .compatible = "ibm,secureboot", },
15 { .compatible = "ibm,secureboot-v1", },
16 { .compatible = "ibm,secureboot-v2", },
17 {},
18 };
19
20 return of_find_matching_node(NULL, ids);
21 }
22
is_ppc_secureboot_enabled(void)23 bool is_ppc_secureboot_enabled(void)
24 {
25 struct device_node *node;
26 bool enabled = false;
27 u32 secureboot;
28
29 node = get_ppc_fw_sb_node();
30 enabled = of_property_read_bool(node, "os-secureboot-enforcing");
31 of_node_put(node);
32
33 if (enabled)
34 goto out;
35
36 node = of_find_node_by_path("/");
37 if (!of_property_read_u32(node, "ibm,secure-boot", &secureboot))
38 enabled = (secureboot > 1);
39 of_node_put(node);
40
41 out:
42 pr_info("Secure boot mode %s\n", str_enabled_disabled(enabled));
43
44 return enabled;
45 }
46
is_ppc_trustedboot_enabled(void)47 bool is_ppc_trustedboot_enabled(void)
48 {
49 struct device_node *node;
50 bool enabled = false;
51 u32 trustedboot;
52
53 node = get_ppc_fw_sb_node();
54 enabled = of_property_read_bool(node, "trusted-enabled");
55 of_node_put(node);
56
57 if (enabled)
58 goto out;
59
60 node = of_find_node_by_path("/");
61 if (!of_property_read_u32(node, "ibm,trusted-boot", &trustedboot))
62 enabled = (trustedboot > 0);
63 of_node_put(node);
64
65 out:
66 pr_info("Trusted boot mode %s\n", str_enabled_disabled(enabled));
67
68 return enabled;
69 }
70