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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Hello world EFI application
- *
- * Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
- *
- * This test program is used to test the invocation of an EFI application.
- * It writes
- *
- * * a greeting
- * * the firmware's UEFI version
- * * the installed configuration tables
- * * the boot device's device path and the file path
- *
- * to the console.
- */
- #include <efi_api.h>
- static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
- static const efi_guid_t device_path_to_text_protocol_guid =
- EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
- static const efi_guid_t device_path_guid = EFI_DEVICE_PATH_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;
- static struct efi_system_table *systable;
- static struct efi_boot_services *boottime;
- static struct efi_simple_text_output_protocol *con_out;
- /**
- * print_uefi_revision() - print UEFI revision number
- */
- static void print_uefi_revision(void)
- {
- u16 rev[] = L"0.0.0";
- 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");
- }
- /**
- * print_config_tables() - print configuration tables
- */
- static void print_config_tables(void)
- {
- efi_uintn_t i;
- /* 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");
- }
- }
- /**
- * print_load_options() - print load options
- *
- * @systable: system table
- * @con_out: simple text output protocol
- */
- void print_load_options(struct efi_loaded_image *loaded_image)
- {
- /* 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"\r\n");
- }
- /**
- * print_device_path() - print device path
- *
- * @device_path: device path to print
- * @dp2txt: device path to text protocol
- */
- efi_status_t print_device_path(struct efi_device_path *device_path,
- struct efi_device_path_to_text_protocol *dp2txt)
- {
- u16 *string;
- efi_status_t ret;
- if (!device_path) {
- con_out->output_string(con_out, L"<none>\r\n");
- return EFI_SUCCESS;
- }
- string = dp2txt->convert_device_path_to_text(device_path, true, false);
- if (!string) {
- con_out->output_string
- (con_out, L"Cannot convert device path to text\r\n");
- return EFI_OUT_OF_RESOURCES;
- }
- con_out->output_string(con_out, string);
- con_out->output_string(con_out, L"\r\n");
- ret = boottime->free_pool(string);
- if (ret != EFI_SUCCESS) {
- con_out->output_string(con_out, L"Cannot free pool memory\r\n");
- return ret;
- }
- return EFI_SUCCESS;
- }
- /**
- * efi_main() - entry point of the EFI application.
- *
- * @handle: handle of the loaded image
- * @systab: system table
- * @return: status code
- */
- efi_status_t EFIAPI efi_main(efi_handle_t handle,
- struct efi_system_table *systab)
- {
- struct efi_loaded_image *loaded_image;
- struct efi_device_path_to_text_protocol *device_path_to_text;
- struct efi_device_path *device_path;
- efi_status_t ret;
- systable = systab;
- boottime = systable->boottime;
- con_out = systable->con_out;
- /* UEFI requires CR LF */
- con_out->output_string(con_out, L"Hello, world!\r\n");
- print_uefi_revision();
- print_config_tables();
- /* 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;
- }
- print_load_options(loaded_image);
- /* Get the device path to text protocol */
- ret = boottime->locate_protocol(&device_path_to_text_protocol_guid,
- NULL, (void **)&device_path_to_text);
- if (ret != EFI_SUCCESS) {
- con_out->output_string
- (con_out, L"Cannot open device path to text protocol\r\n");
- goto out;
- }
- if (!loaded_image->device_handle) {
- con_out->output_string
- (con_out, L"Missing device handle\r\n");
- goto out;
- }
- ret = boottime->handle_protocol(loaded_image->device_handle,
- &device_path_guid,
- (void **)&device_path);
- if (ret != EFI_SUCCESS) {
- con_out->output_string
- (con_out, L"Missing device path for device handle\r\n");
- goto out;
- }
- con_out->output_string(con_out, L"Boot device: ");
- ret = print_device_path(device_path, device_path_to_text);
- if (ret != EFI_SUCCESS)
- goto out;
- con_out->output_string(con_out, L"File path: ");
- ret = print_device_path(loaded_image->file_path, device_path_to_text);
- if (ret != EFI_SUCCESS)
- goto out;
- out:
- boottime->exit(handle, ret, 0, NULL);
- /* We should never arrive here */
- return ret;
- }
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