efi_loader: show UEFI revision in helloworld

[u-boot] / lib / efi_loader / helloworld.c

diff --git a/lib/efi_loader/helloworld.c b/lib/efi_loader/helloworld.c
index e59c24c7881b5b8466f32ec8dfd116b73aadcce7..6c539ba2049853f786776b42caef0555bd074124 100644 (file)
--- a/lib/efi_loader/helloworld.c
+++ b/lib/efi_loader/helloworld.c
@@ -13,6 +13,24 @@
 #include <common.h>
 #include <efi_api.h>
 
+static const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
+static const efi_guid_t fdt_guid = EFI_FDT_GUID;
+static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
+
+static int hw_memcmp(const void *buf1, const void *buf2, size_t length)
+{
+       const u8 *pos1 = buf1;
+       const u8 *pos2 = buf2;
+
+       for (; length; --length) {
+               if (*pos1 != *pos2)
+                       return *pos1 - *pos2;
+               ++pos1;
+               ++pos2;
+       }
+       return 0;
+}
+
 /*
  * Entry point of the EFI application.
  *
@@ -26,11 +44,29 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle,
        struct efi_simple_text_output_protocol *con_out = systable->con_out;
        struct efi_boot_services *boottime = systable->boottime;
        struct efi_loaded_image *loaded_image;
-       const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
        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);
@@ -39,6 +75,15 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle,
                                       L"Cannot open loaded image protocol\n");
                goto out;
        }
+       /* Find configuration tables */
+       for (i = 0; i < systable->nr_tables; ++i) {
+               if (!hw_memcmp(&systable->tables[i].guid, &fdt_guid,
+                              sizeof(efi_guid_t)))
+                       con_out->output_string(con_out, L"Have device tree\n");
+               if (!hw_memcmp(&systable->tables[i].guid, &smbios_guid,
+                              sizeof(efi_guid_t)))
+                       con_out->output_string(con_out, L"Have SMBIOS table\n");
+       }
        /* Output the load options */
        con_out->output_string(con_out, L"Load options: ");
        if (loaded_image->load_options_size && loaded_image->load_options)