+// SPDX-License-Identifier: GPL-2.0+
/*
* EFI hello world
*
* Copyright (c) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
- * SPDX-License-Identifier: GPL-2.0+
+ * This program demonstrates calling a boottime service.
+ * It writes a greeting and the load options to the console.
*/
#include <common.h>
-#include <part_efi.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.
+ *
+ * @handle handle of the loaded image
+ * @systable system table
+ * @return status code
+ */
efi_status_t EFIAPI efi_main(efi_handle_t handle,
struct efi_system_table *systable)
{
struct efi_simple_text_output_protocol *con_out = systable->con_out;
struct efi_boot_services *boottime = systable->boottime;
+ 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");
- boottime->exit(handle, 0, 0, NULL);
- return EFI_SUCCESS;
+ /* 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);
+ if (ret != EFI_SUCCESS) {
+ con_out->output_string(con_out,
+ 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)
+ con_out->output_string(con_out,
+ (u16 *)loaded_image->load_options);
+ else
+ con_out->output_string(con_out, L"<none>");
+ con_out->output_string(con_out, L"\n");
+
+out:
+ boottime->exit(handle, ret, 0, NULL);
+
+ /* We should never arrive here */
+ return ret;
}