efi_loader: show UEFI revision in helloworld

Output the UEFI revision number in helloworld.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/lib/efi_loader/helloworld.c b/lib/efi_loader/helloworld.c
index 1ec0179226328f4f31b6fc44645699095153fab2..6c539ba2049853f786776b42caef0555bd074124 100644 (file)
--- a/lib/efi_loader/helloworld.c
+++ b/lib/efi_loader/helloworld.c
@@ -46,9 +46,27 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle,
        struct efi_loaded_image *loaded_image;
        efi_status_t ret;
        efi_uintn_t i;
+       u16 rev[] = L"0.0.0";
 
        con_out->output_string(con_out, L"Hello, world!\n");
 
+       /* Print the revision number */
+       rev[0] = (systable->hdr.revision >> 16) + '0';
+       rev[4] = systable->hdr.revision & 0xffff;
+       for (; rev[4] >= 10;) {
+               rev[4] -= 10;
+               ++rev[2];
+       }
+       /* Third digit is only to be shown if non-zero */
+       if (rev[4])
+               rev[4] += '0';
+       else
+               rev[3] = 0;
+
+       con_out->output_string(con_out, L"Running on UEFI ");
+       con_out->output_string(con_out, rev);
+       con_out->output_string(con_out, L"\n");
+
        /* Get the loaded image protocol */
        ret = boottime->handle_protocol(handle, &loaded_image_guid,
                                        (void **)&loaded_image);