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  • /*
     * 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 <efi_api.h>
    
    
    /*
     * 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;
    	const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
    	efi_status_t ret;
    
    
    	con_out->output_string(con_out, L"Hello, world!\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;
    	}
    	/* 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;