[PATCH 1/3] efi_loader: print boot device and file path in helloworld
Heinrich Schuchardt
xypron.glpk at gmx.de
Tue Jan 12 20:58:40 CET 2021
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 at 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 at chromium.org>
+ * Copyright 2020, Heinrich Schuchardt <xypron.glpk at 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
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