[PATCH 8/8] efi: add veriable to report secure boot support and status

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagn...@jcrosoft.com>
---
 drivers/efi/efi-device.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/efi/efi-device.c b/drivers/efi/efi-device.c
index db8b25147..6ed7f12b3 100644
--- a/drivers/efi/efi-device.c
+++ b/drivers/efi/efi-device.c
@@ -354,11 +354,41 @@ static void efi_businfo(struct device_d *dev)
        }
 }
 
+static int efi_is_secure_boot(void)
+{
+       uint8_t *val;
+       int ret = 0;
+
+       val = efi_get_variable("SecureBoot", &efi_global_variable_guid, NULL);
+       if (!IS_ERR(val)) {
+               ret = *val;
+               free(val);
+       }
+
+       return ret != 1;
+}
+
+static int efi_is_setup_mode(void)
+{
+       uint8_t *val;
+       int ret = 0;
+
+       val = efi_get_variable("SetupMode", &efi_global_variable_guid, NULL);
+       if (!IS_ERR(val)) {
+               ret = *val;
+               free(val);
+       }
+
+       return ret != 1;
+}
+
 static int efi_init_devices(void)
 {
        char *fw_vendor = NULL;
        u16 sys_major = efi_sys_table->hdr.revision >> 16;
        u16 sys_minor = efi_sys_table->hdr.revision & 0xffff;
+       int secure_boot = efi_is_secure_boot();
+       int setup_mode = efi_is_setup_mode();
 
        fw_vendor = strdup_wchar_to_char((const wchar_t 
*)efi_sys_table->fw_vendor);
 
@@ -374,6 +404,9 @@ static int efi_init_devices(void)
        dev_add_param_int_ro(efi_bus.dev, "major", sys_major, "%u");
        dev_add_param_int_ro(efi_bus.dev, "minor", sys_minor, "%u");
        dev_add_param_int_ro(efi_bus.dev, "fw_revision", 
efi_sys_table->fw_revision, "%u");
+       dev_add_param_int_ro(efi_bus.dev, "secure_boot", secure_boot, "%d");
+       dev_add_param_int_ro(efi_bus.dev, "secure_mode",
+                            secure_boot & setup_mode, "%u");
 
        efi_bus.dev->info = efi_businfo;
 
-- 
2.11.0


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