1 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
new file mode 100644
index 000000000..f9af305d9
--- /dev/null
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain
+ */
+#include <linux/types.h>
+#include <linux/of.h>
+#include <asm/secure_boot.h>
+
+static struct device_node *get_ppc_fw_sb_node(void)
+{
+	static const struct of_device_id ids[] = {
+		{ .compatible = "ibm,secureboot", },
+		{ .compatible = "ibm,secureboot-v1", },
+		{ .compatible = "ibm,secureboot-v2", },
+		{},
+	};
+
+	return of_find_matching_node(NULL, ids);
+}
+
+bool is_ppc_secureboot_enabled(void)
+{
+	struct device_node *node;
+	bool enabled = false;
+	u32 secureboot;
+
+	node = get_ppc_fw_sb_node();
+	enabled = of_property_read_bool(node, "os-secureboot-enforcing");
+	of_node_put(node);
+
+	if (enabled)
+		goto out;
+
+	if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot))
+		enabled = (secureboot > 1);
+
+out:
+	pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
+
+	return enabled;
+}
+
+bool is_ppc_trustedboot_enabled(void)
+{
+	struct device_node *node;
+	bool enabled = false;
+	u32 trustedboot;
+
+	node = get_ppc_fw_sb_node();
+	enabled = of_property_read_bool(node, "trusted-enabled");
+	of_node_put(node);
+
+	if (enabled)
+		goto out;
+
+	if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot))
+		enabled = (trustedboot > 0);
+
+out:
+	pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
+
+	return enabled;
+}