Let helloworld.efi print the device path of the boot device and the file path as provided by the loaded image protocol.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- lib/efi_loader/helloworld.c | 167 +++++++++++++++++++++++++++++------- 1 file changed, 137 insertions(+), 30 deletions(-)
diff --git a/lib/efi_loader/helloworld.c b/lib/efi_loader/helloworld.c index 9ae2ee3389..5c8b7a96f9 100644 --- a/lib/efi_loader/helloworld.c +++ b/lib/efi_loader/helloworld.c @@ -1,43 +1,41 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * EFI hello world + * Hello world EFI application * - * Copyright (c) 2016 Google, Inc - * Written by Simon Glass sjg@chromium.org + * Copyright 2020, Heinrich Schuchardt xypron.glpk@gmx.de * - * This program demonstrates calling a boottime service. - * It writes a greeting and the load options to the console. + * 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 <common.h> #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; + /** - * efi_main() - entry point of the EFI application. - * - * @handle: handle of the loaded image - * @systable: system table - * @return: status code + * print_uefi_revision() - print UEFI revision number */ -efi_status_t EFIAPI efi_main(efi_handle_t handle, - struct efi_system_table *systable) +static void print_uefi_revision(void) { - 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;) { @@ -53,15 +51,15 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle, 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;
- /* 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, @@ -77,6 +75,16 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle, 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) @@ -85,6 +93,105 @@ efi_status_t EFIAPI efi_main(efi_handle_t handle, 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 devide 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); -- 2.29.2