// SPDX-License-Identifier: GPL-2.0+ /* * EFI hello world * * Copyright (c) 2016 Google, Inc * Written by Simon Glass * * This program demonstrates calling a boottime service. * It writes a greeting and the load options to the console. */ #include #include static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID; static const efi_guid_t fdt_guid = EFI_FDT_GUID; static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID; static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID; /** * efi_main() - 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"; /* UEFI requires CR LF */ con_out->output_string(con_out, L"Hello, world!\r\n"); /* 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"\r\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\r\n"); goto out; } /* Find configuration tables */ for (i = 0; i < systable->nr_tables; ++i) { if (!memcmp(&systable->tables[i].guid, &fdt_guid, sizeof(efi_guid_t))) con_out->output_string (con_out, L"Have device tree\r\n"); if (!memcmp(&systable->tables[i].guid, &acpi_guid, sizeof(efi_guid_t))) con_out->output_string (con_out, L"Have ACPI 2.0 table\r\n"); if (!memcmp(&systable->tables[i].guid, &smbios_guid, sizeof(efi_guid_t))) con_out->output_string (con_out, L"Have SMBIOS table\r\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""); con_out->output_string(con_out, L"\r\n"); out: boottime->exit(handle, ret, 0, NULL); /* We should never arrive here */ return ret; }