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-rw-r--r--lib/efi_loader/helloworld.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/efi_loader/helloworld.c b/lib/efi_loader/helloworld.c
index b8c147d7f2a..1ec01792263 100644
--- 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)