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 static const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID; 17 18 /* 19 * Entry point of the EFI application. 20 * 21 * @handle handle of the loaded image 22 * @systable system table 23 * @return status code 24 */ 25 efi_status_t EFIAPI efi_main(efi_handle_t handle, 26 struct efi_system_table *systable) 27 { 28 struct efi_simple_text_output_protocol *con_out = systable->con_out; 29 struct efi_boot_services *boottime = systable->boottime; 30 struct efi_loaded_image *loaded_image; 31 efi_status_t ret; 32 33 con_out->output_string(con_out, L"Hello, world!\n"); 34 35 /* Get the loaded image protocol */ 36 ret = boottime->handle_protocol(handle, &loaded_image_guid, 37 (void **)&loaded_image); 38 if (ret != EFI_SUCCESS) { 39 con_out->output_string(con_out, 40 L"Cannot open loaded image protocol\n"); 41 goto out; 42 } 43 /* Output the load options */ 44 con_out->output_string(con_out, L"Load options: "); 45 if (loaded_image->load_options_size && loaded_image->load_options) 46 con_out->output_string(con_out, 47 (u16 *)loaded_image->load_options); 48 else 49 con_out->output_string(con_out, L"<none>"); 50 con_out->output_string(con_out, L"\n"); 51 52 out: 53 boottime->exit(handle, ret, 0, NULL); 54 55 /* We should never arrive here */ 56 return ret; 57 } 58