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
get_ppc_fw_sb_node(void)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
is_ppc_secureboot_enabled(void)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 node = of_find_node_by_path("/");
36 if (!of_property_read_u32(node, "ibm,secure-boot", &secureboot))
37 enabled = (secureboot > 1);
38 of_node_put(node);
39
40 out:
41 pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
42
43 return enabled;
44 }
45
is_ppc_trustedboot_enabled(void)46 bool is_ppc_trustedboot_enabled(void)
47 {
48 struct device_node *node;
49 bool enabled = false;
50 u32 trustedboot;
51
52 node = get_ppc_fw_sb_node();
53 enabled = of_property_read_bool(node, "trusted-enabled");
54 of_node_put(node);
55
56 if (enabled)
57 goto out;
58
59 node = of_find_node_by_path("/");
60 if (!of_property_read_u32(node, "ibm,trusted-boot", &trustedboot))
61 enabled = (trustedboot > 0);
62 of_node_put(node);
63
64 out:
65 pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
66
67 return enabled;
68 }
69