1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2016 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
8 * This program demonstrates calling a boottime service.
9 * It writes a greeting and the load options to the console.
15 static const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
16 static const efi_guid_t fdt_guid = EFI_FDT_GUID;
17 static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
19 static int hw_memcmp(const void *buf1, const void *buf2, size_t length)
21 const u8 *pos1 = buf1;
22 const u8 *pos2 = buf2;
24 for (; length; --length) {
34 * Entry point of the EFI application.
36 * @handle handle of the loaded image
37 * @systable system table
40 efi_status_t EFIAPI efi_main(efi_handle_t handle,
41 struct efi_system_table *systable)
43 struct efi_simple_text_output_protocol *con_out = systable->con_out;
44 struct efi_boot_services *boottime = systable->boottime;
45 struct efi_loaded_image *loaded_image;
50 con_out->output_string(con_out, L"Hello, world!\n");
52 /* Print the revision number */
53 rev[0] = (systable->hdr.revision >> 16) + '0';
54 rev[4] = systable->hdr.revision & 0xffff;
55 for (; rev[4] >= 10;) {
59 /* Third digit is only to be shown if non-zero */
65 con_out->output_string(con_out, L"Running on UEFI ");
66 con_out->output_string(con_out, rev);
67 con_out->output_string(con_out, L"\n");
69 /* Get the loaded image protocol */
70 ret = boottime->handle_protocol(handle, &loaded_image_guid,
71 (void **)&loaded_image);
72 if (ret != EFI_SUCCESS) {
73 con_out->output_string(con_out,
74 L"Cannot open loaded image protocol\n");
77 /* Find configuration tables */
78 for (i = 0; i < systable->nr_tables; ++i) {
79 if (!hw_memcmp(&systable->tables[i].guid, &fdt_guid,
81 con_out->output_string(con_out, L"Have device tree\n");
82 if (!hw_memcmp(&systable->tables[i].guid, &smbios_guid,
84 con_out->output_string(con_out, L"Have SMBIOS table\n");
86 /* Output the load options */
87 con_out->output_string(con_out, L"Load options: ");
88 if (loaded_image->load_options_size && loaded_image->load_options)
89 con_out->output_string(con_out,
90 (u16 *)loaded_image->load_options);
92 con_out->output_string(con_out, L"<none>");
93 con_out->output_string(con_out, L"\n");
96 boottime->exit(handle, ret, 0, NULL);
98 /* We should never arrive here */