efi_loader: check tables in helloworld.efi

Check if the device tree and the SMBIOS table are available.

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 b8c147d7f2a271b9ebda5ee33221dbd69d2bc8c2..1ec0179226328f4f31b6fc44645699095153fab2 100644 (file)
--- a/lib/efi_loader/helloworld.c
+++ b/lib/efi_loader/helloworld.c
@@ -14,6 +14,22 @@
 #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.
@@ -29,6 +45,7 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle,
        struct efi_boot_services *boottime = systable->boottime;
        struct efi_loaded_image *loaded_image;
        efi_status_t ret;
+       efi_uintn_t i;
 
        con_out->output_string(con_out, L"Hello, world!\n");
 
@@ -40,6 +57,15 @@ 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)