/**
* EFI entry point
*
* @v image_handle Image handle
* @v systab System table
* @ret efirc EFI return status code
*/
EFI_STATUS EFIAPI _efi_start ( EFI_HANDLE image_handle,
EFI_SYSTEM_TABLE *systab ) {
EFI_STATUS efirc;
int rc;
/* Initialise EFI environment */
if ( ( efirc = efi_init ( image_handle, systab ) ) != 0 )
goto err_init;
/* Record autoboot device (if any) */
efi_set_autoboot();
/* Claim SNP devices for use by iPXE */
efi_snp_claim();
/* Call to main() */
if ( ( rc = main() ) != 0 ) {
efirc = EFIRC ( rc );
goto err_main;
}
err_main:
efi_snp_release();
efi_loaded_image->Unload ( image_handle );
efi_driver_reconnect_all();
err_init:
return efirc;
}
/**
* Transfer finished or was aborted
*
* @v file Data transfer file
* @v rc Reason for close
*/
static void efi_download_close ( struct efi_download_file *file, int rc ) {
file->finish_callback ( file->context, EFIRC ( rc ) );
intf_shutdown ( &file->xfer, rc );
efi_snp_release();
}
/**
* EFI entry point
*
* @v image_handle Image handle
* @v systab System table
* @ret efirc EFI return status code
*/
EFI_STATUS EFIAPI _efidrv_start ( EFI_HANDLE image_handle,
EFI_SYSTEM_TABLE *systab ) {
EFI_STATUS efirc;
/* Initialise EFI environment */
if ( ( efirc = efi_init ( image_handle, systab ) ) != 0 )
return efirc;
/* Initialise iPXE environment */
initialise();
startup();
/* Release network devices for use via SNP */
efi_snp_release();
return 0;
}
/**
* Execute EFI image
*
* @v image EFI image
* @ret rc Return status code
*/
static int efi_image_exec ( struct image *image ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_snp_device *snpdev;
EFI_DEVICE_PATH_PROTOCOL *path;
union {
EFI_LOADED_IMAGE_PROTOCOL *image;
void *interface;
} loaded;
EFI_HANDLE handle;
wchar_t *cmdline;
EFI_STATUS efirc;
int rc;
/* Find an appropriate device handle to use */
snpdev = last_opened_snpdev();
if ( ! snpdev ) {
DBGC ( image, "EFIIMAGE %p could not identify SNP device\n",
image );
rc = -ENODEV;
goto err_no_snpdev;
}
/* Install file I/O protocols */
if ( ( rc = efi_file_install ( snpdev->handle ) ) != 0 ) {
DBGC ( image, "EFIIMAGE %p could not install file protocol: "
"%s\n", image, strerror ( rc ) );
goto err_file_install;
}
/* Install iPXE download protocol */
if ( ( rc = efi_download_install ( snpdev->handle ) ) != 0 ) {
DBGC ( image, "EFIIMAGE %p could not install iPXE download "
"protocol: %s\n", image, strerror ( rc ) );
goto err_download_install;
}
/* Create device path for image */
path = efi_image_path ( image, snpdev->path );
if ( ! path ) {
DBGC ( image, "EFIIMAGE %p could not create device path\n",
image );
rc = -ENOMEM;
goto err_image_path;
}
/* Create command line for image */
cmdline = efi_image_cmdline ( image );
if ( ! cmdline ) {
DBGC ( image, "EFIIMAGE %p could not create command line\n",
image );
rc = -ENOMEM;
goto err_cmdline;
}
/* Attempt loading image */
if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, path,
user_to_virt ( image->data, 0 ),
image->len, &handle ) ) != 0 ) {
/* Not an EFI image */
rc = -EEFI_LOAD ( efirc );
DBGC ( image, "EFIIMAGE %p could not load: %s\n",
image, strerror ( rc ) );
goto err_load_image;
}
/* Get the loaded image protocol for the newly loaded image */
efirc = bs->OpenProtocol ( handle, &efi_loaded_image_protocol_guid,
&loaded.interface, efi_image_handle,
NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL );
if ( efirc ) {
/* Should never happen */
rc = -EEFI ( efirc );
goto err_open_protocol;
}
/* Some EFI 1.10 implementations seem not to fill in DeviceHandle */
if ( loaded.image->DeviceHandle == NULL ) {
DBGC ( image, "EFIIMAGE %p filling in missing DeviceHandle\n",
image );
loaded.image->DeviceHandle = snpdev->handle;
}
/* Sanity checks */
assert ( loaded.image->ParentHandle == efi_image_handle );
assert ( loaded.image->DeviceHandle == snpdev->handle );
assert ( loaded.image->LoadOptionsSize == 0 );
assert ( loaded.image->LoadOptions == NULL );
/* Set command line */
loaded.image->LoadOptions = cmdline;
loaded.image->LoadOptionsSize =
( ( wcslen ( cmdline ) + 1 /* NUL */ ) * sizeof ( wchar_t ) );
/* Release network devices for use via SNP */
efi_snp_release();
/* Wrap calls made by the loaded image (for debugging) */
efi_wrap ( handle );
/* Start the image */
if ( ( efirc = bs->StartImage ( handle, NULL, NULL ) ) != 0 ) {
rc = -EEFI_START ( efirc );
DBGC ( image, "EFIIMAGE %p could not start (or returned with "
"error): %s\n", image, strerror ( rc ) );
goto err_start_image;
}
/* Success */
rc = 0;
err_start_image:
efi_snp_claim();
err_open_protocol:
/* If there was no error, then the image must have been
* started and returned successfully. It either unloaded
* itself, or it intended to remain loaded (e.g. it was a
* driver). We therefore do not unload successful images.
*
* If there was an error, attempt to unload the image. This
* may not work. In particular, there is no way to tell
* whether an error returned from StartImage() was due to
* being unable to start the image (in which case we probably
* should call UnloadImage()), or due to the image itself
* returning an error (in which case we probably should not
* call UnloadImage()). We therefore ignore any failures from
* the UnloadImage() call itself.
*/
if ( rc != 0 )
bs->UnloadImage ( handle );
err_load_image:
free ( cmdline );
err_cmdline:
free ( path );
err_image_path:
efi_download_uninstall ( snpdev->handle );
err_download_install:
efi_file_uninstall ( snpdev->handle );
err_file_install:
err_no_snpdev:
return rc;
}
