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 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 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 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