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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "device-path-util.h"
#include "drivers.h"
#include "util.h"
static EFI_STATUS load_one_driver(
EFI_HANDLE parent_image,
EFI_LOADED_IMAGE_PROTOCOL *loaded_image,
const char16_t *fname) {
_cleanup_(unload_imagep) EFI_HANDLE image = NULL;
_cleanup_free_ EFI_DEVICE_PATH *path = NULL;
_cleanup_free_ char16_t *spath = NULL;
EFI_STATUS err;
assert(parent_image);
assert(loaded_image);
assert(fname);
spath = xasprintf("\\EFI\\systemd\\drivers\\%ls", fname);
err = make_file_device_path(loaded_image->DeviceHandle, spath, &path);
if (err != EFI_SUCCESS)
return log_error_status(err, "Error making file device path: %m");
err = BS->LoadImage(false, parent_image, path, NULL, 0, &image);
if (err != EFI_SUCCESS)
return log_error_status(err, "Failed to load image %ls: %m", fname);
err = BS->HandleProtocol(image, MAKE_GUID_PTR(EFI_LOADED_IMAGE_PROTOCOL), (void **) &loaded_image);
if (err != EFI_SUCCESS)
return log_error_status(err, "Failed to find protocol in driver image %ls: %m", fname);
if (loaded_image->ImageCodeType != EfiBootServicesCode &&
loaded_image->ImageCodeType != EfiRuntimeServicesCode)
return log_error("Image %ls is not a driver, refusing.", fname);
err = BS->StartImage(image, NULL, NULL);
if (err != EFI_SUCCESS) {
/* EFI_ABORTED signals an initializing driver. It uses this error code on success
* so that it is unloaded after. */
if (err != EFI_ABORTED)
log_error_status(err, "Failed to start image %ls: %m", fname);
return err;
}
TAKE_PTR(image);
return EFI_SUCCESS;
}
EFI_STATUS reconnect_all_drivers(void) {
_cleanup_free_ EFI_HANDLE *handles = NULL;
size_t n_handles = 0;
EFI_STATUS err;
/* Reconnects all handles, so that any loaded drivers can take effect. */
err = BS->LocateHandleBuffer(AllHandles, NULL, NULL, &n_handles, &handles);
if (err != EFI_SUCCESS)
return log_error_status(err, "Failed to get list of handles: %m");
for (size_t i = 0; i < n_handles; i++)
/* Some firmware gives us some bogus handles (or they might become bad due to
* reconnecting everything). Security policy may also prevent us from doing so too.
* There is nothing we can realistically do on errors anyways, so just ignore them. */
(void) BS->ConnectController(handles[i], NULL, NULL, true);
return EFI_SUCCESS;
}
EFI_STATUS load_drivers(
EFI_HANDLE parent_image,
EFI_LOADED_IMAGE_PROTOCOL *loaded_image,
EFI_FILE *root_dir) {
_cleanup_(file_closep) EFI_FILE *drivers_dir = NULL;
_cleanup_free_ EFI_FILE_INFO *dirent = NULL;
size_t dirent_size = 0, n_succeeded = 0;
EFI_STATUS err;
err = open_directory(
root_dir,
u"\\EFI\\systemd\\drivers",
&drivers_dir);
if (err == EFI_NOT_FOUND)
return EFI_SUCCESS;
if (err != EFI_SUCCESS)
return log_error_status(err, "Failed to open \\EFI\\systemd\\drivers: %m");
for (;;) {
err = readdir(drivers_dir, &dirent, &dirent_size);
if (err != EFI_SUCCESS)
return log_error_status(err, "Failed to read extra directory of loaded image: %m");
if (!dirent) /* End of directory */
break;
if (dirent->FileName[0] == '.')
continue;
if (FLAGS_SET(dirent->Attribute, EFI_FILE_DIRECTORY))
continue;
if (!endswith_no_case(dirent->FileName, EFI_MACHINE_TYPE_NAME u".efi"))
continue;
err = load_one_driver(parent_image, loaded_image, dirent->FileName);
if (err != EFI_SUCCESS)
continue;
n_succeeded++;
}
if (n_succeeded > 0)
(void) reconnect_all_drivers();
return EFI_SUCCESS;
}
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