boot: add get_os_indications_supported() helper

We inquire the EFI var for this at two places, let's add a helper that
queries it and gracefully handles it if we can't get it, by returning a
zero mask, i.e. no features supported.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c
index e500069d51..13697c9433 100644
--- a/src/boot/efi/util.c
+++ b/src/boot/efi/util.c
@@ -743,3 +743,17 @@ EFI_STATUS open_directory(
         *ret = TAKE_PTR(dir);
         return EFI_SUCCESS;
 }
+
+UINT64 get_os_indications_supported(VOID) {
+        UINT64 osind;
+        EFI_STATUS err;
+
+        /* Returns the supported OS indications. If we can't acquire it, returns a zeroed out mask, i.e. no
+         * supported features. */
+
+        err = efivar_get_uint64_le(EFI_GLOBAL_GUID, L"OsIndicationsSupported", &osind);
+        if (EFI_ERROR(err))
+                return 0;
+
+        return osind;
+}