1 /* 2 * EFI hello world 3 * 4 * Copyright (c) 2016 Google, Inc 5 * Written by Simon Glass <sjg@chromium.org> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 * 9 * This program demonstrates calling a boottime service. 10 * It writes a greeting and the load options to the console. 11 */ 12 13 #include <common.h> 14 #include <efi_api.h> 15 16 /* 17 * Entry point of the EFI application. 18 * 19 * @handle handle of the loaded image 20 * @systable system table 21 * @return status code 22 */ 23 efi_status_t EFIAPI efi_main(efi_handle_t handle, 24 struct efi_system_table *systable) 25 { 26 struct efi_simple_text_output_protocol *con_out = systable->con_out; 27 struct efi_boot_services *boottime = systable->boottime; 28 struct efi_loaded_image *loaded_image; 29 const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID; 30 efi_status_t ret; 31 32 con_out->output_string(con_out, L"Hello, world!\n"); 33 34 /* Get the loaded image protocol */ 35 ret = boottime->handle_protocol(handle, &loaded_image_guid, 36 (void **)&loaded_image); 37 if (ret != EFI_SUCCESS) { 38 con_out->output_string(con_out, 39 L"Cannot open loaded image protocol\n"); 40 goto out; 41 } 42 /* Output the load options */ 43 con_out->output_string(con_out, L"Load options: "); 44 if (loaded_image->load_options_size && loaded_image->load_options) 45 con_out->output_string(con_out, 46 (u16 *)loaded_image->load_options); 47 else 48 con_out->output_string(con_out, L"<none>"); 49 con_out->output_string(con_out, L"\n"); 50 51 out: 52 boottime->exit(handle, ret, 0, NULL); 53 54 /* We should never arrive here */ 55 return ret; 56 } 57