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- /*
- * Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- /**
- * @file
- *
- * EFI block device protocols
- *
- */
-
- #include <stddef.h>
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include <ipxe/refcnt.h>
- #include <ipxe/list.h>
- #include <ipxe/uri.h>
- #include <ipxe/interface.h>
- #include <ipxe/blockdev.h>
- #include <ipxe/xfer.h>
- #include <ipxe/open.h>
- #include <ipxe/retry.h>
- #include <ipxe/timer.h>
- #include <ipxe/process.h>
- #include <ipxe/sanboot.h>
- #include <ipxe/iso9660.h>
- #include <ipxe/acpi.h>
- #include <ipxe/efi/efi.h>
- #include <ipxe/efi/Protocol/BlockIo.h>
- #include <ipxe/efi/Protocol/SimpleFileSystem.h>
- #include <ipxe/efi/Protocol/AcpiTable.h>
- #include <ipxe/efi/efi_driver.h>
- #include <ipxe/efi/efi_strings.h>
- #include <ipxe/efi/efi_snp.h>
- #include <ipxe/efi/efi_utils.h>
- #include <ipxe/efi/efi_block.h>
-
- /** ACPI table protocol protocol */
- static EFI_ACPI_TABLE_PROTOCOL *acpi;
- EFI_REQUEST_PROTOCOL ( EFI_ACPI_TABLE_PROTOCOL, &acpi );
-
- /** Boot filename */
- static wchar_t efi_block_boot_filename[] = EFI_REMOVABLE_MEDIA_FILE_NAME;
-
- /** iPXE EFI block device vendor device path GUID */
- #define IPXE_BLOCK_DEVICE_PATH_GUID \
- { 0x8998b594, 0xf531, 0x4e87, \
- { 0x8b, 0xdf, 0x8f, 0x88, 0x54, 0x3e, 0x99, 0xd4 } }
-
- /** iPXE EFI block device vendor device path GUID */
- static EFI_GUID ipxe_block_device_path_guid
- = IPXE_BLOCK_DEVICE_PATH_GUID;
-
- /** An iPXE EFI block device vendor device path */
- struct efi_block_vendor_path {
- /** Generic vendor device path */
- VENDOR_DEVICE_PATH vendor;
- /** Block device URI */
- CHAR16 uri[0];
- } __attribute__ (( packed ));
-
- /** EFI SAN device private data */
- struct efi_block_data {
- /** SAN device */
- struct san_device *sandev;
- /** EFI handle */
- EFI_HANDLE handle;
- /** Media descriptor */
- EFI_BLOCK_IO_MEDIA media;
- /** Block I/O protocol */
- EFI_BLOCK_IO_PROTOCOL block_io;
- /** Device path protocol */
- EFI_DEVICE_PATH_PROTOCOL *path;
- };
-
- /**
- * Read from or write to EFI block device
- *
- * @v sandev SAN device
- * @v lba Starting LBA
- * @v data Data buffer
- * @v len Size of buffer
- * @v sandev_rw SAN device read/write method
- * @ret rc Return status code
- */
- static int efi_block_rw ( struct san_device *sandev, uint64_t lba,
- void *data, size_t len,
- int ( * sandev_rw ) ( struct san_device *sandev,
- uint64_t lba, unsigned int count,
- userptr_t buffer ) ) {
- struct efi_block_data *block = sandev->priv;
- unsigned int count;
- int rc;
-
- /* Sanity check */
- count = ( len / block->media.BlockSize );
- if ( ( count * block->media.BlockSize ) != len ) {
- DBGC ( sandev, "EFIBLK %#02x impossible length %#zx\n",
- sandev->drive, len );
- return -EINVAL;
- }
-
- /* Read from / write to block device */
- if ( ( rc = sandev_rw ( sandev, lba, count,
- virt_to_user ( data ) ) ) != 0 ) {
- DBGC ( sandev, "EFIBLK %#02x I/O failed: %s\n",
- sandev->drive, strerror ( rc ) );
- return rc;
- }
-
- return 0;
- }
-
- /**
- * Reset EFI block device
- *
- * @v block_io Block I/O protocol
- * @v verify Perform extended verification
- * @ret efirc EFI status code
- */
- static EFI_STATUS EFIAPI efi_block_io_reset ( EFI_BLOCK_IO_PROTOCOL *block_io,
- BOOLEAN verify __unused ) {
- struct efi_block_data *block =
- container_of ( block_io, struct efi_block_data, block_io );
- struct san_device *sandev = block->sandev;
- int rc;
-
- DBGC2 ( sandev, "EFIBLK %#02x reset\n", sandev->drive );
- efi_snp_claim();
- rc = sandev_reset ( sandev );
- efi_snp_release();
- return EFIRC ( rc );
- }
-
- /**
- * Read from EFI block device
- *
- * @v block_io Block I/O protocol
- * @v media Media identifier
- * @v lba Starting LBA
- * @v len Size of buffer
- * @v data Data buffer
- * @ret efirc EFI status code
- */
- static EFI_STATUS EFIAPI
- efi_block_io_read ( EFI_BLOCK_IO_PROTOCOL *block_io, UINT32 media __unused,
- EFI_LBA lba, UINTN len, VOID *data ) {
- struct efi_block_data *block =
- container_of ( block_io, struct efi_block_data, block_io );
- struct san_device *sandev = block->sandev;
- int rc;
-
- DBGC2 ( sandev, "EFIBLK %#02x read LBA %#08llx to %p+%#08zx\n",
- sandev->drive, lba, data, ( ( size_t ) len ) );
- efi_snp_claim();
- rc = efi_block_rw ( sandev, lba, data, len, sandev_read );
- efi_snp_release();
- return EFIRC ( rc );
- }
-
- /**
- * Write to EFI block device
- *
- * @v block_io Block I/O protocol
- * @v media Media identifier
- * @v lba Starting LBA
- * @v len Size of buffer
- * @v data Data buffer
- * @ret efirc EFI status code
- */
- static EFI_STATUS EFIAPI
- efi_block_io_write ( EFI_BLOCK_IO_PROTOCOL *block_io, UINT32 media __unused,
- EFI_LBA lba, UINTN len, VOID *data ) {
- struct efi_block_data *block =
- container_of ( block_io, struct efi_block_data, block_io );
- struct san_device *sandev = block->sandev;
- int rc;
-
- DBGC2 ( sandev, "EFIBLK %#02x write LBA %#08llx from %p+%#08zx\n",
- sandev->drive, lba, data, ( ( size_t ) len ) );
- efi_snp_claim();
- rc = efi_block_rw ( sandev, lba, data, len, sandev_write );
- efi_snp_release();
- return EFIRC ( rc );
- }
-
- /**
- * Flush data to EFI block device
- *
- * @v block_io Block I/O protocol
- * @ret efirc EFI status code
- */
- static EFI_STATUS EFIAPI
- efi_block_io_flush ( EFI_BLOCK_IO_PROTOCOL *block_io ) {
- struct efi_block_data *block =
- container_of ( block_io, struct efi_block_data, block_io );
- struct san_device *sandev = block->sandev;
-
- DBGC2 ( sandev, "EFIBLK %#02x flush\n", sandev->drive );
-
- /* Nothing to do */
- return 0;
- }
-
- /**
- * Connect all possible drivers to EFI block device
- *
- * @v sandev SAN device
- */
- static void efi_block_connect ( struct san_device *sandev ) {
- EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
- struct efi_block_data *block = sandev->priv;
- EFI_STATUS efirc;
- int rc;
-
- /* Try to connect all possible drivers to this block device */
- if ( ( efirc = bs->ConnectController ( block->handle, NULL,
- NULL, 1 ) ) != 0 ) {
- rc = -EEFI ( efirc );
- DBGC ( sandev, "EFIBLK %#02x could not connect drivers: %s\n",
- sandev->drive, strerror ( rc ) );
- /* May not be an error; may already be connected */
- }
- DBGC2 ( sandev, "EFIBLK %#02x supports protocols:\n", sandev->drive );
- DBGC2_EFI_PROTOCOLS ( sandev, block->handle );
- }
-
- /**
- * Hook EFI block device
- *
- * @v drive Drive number
- * @v uris List of URIs
- * @v count Number of URIs
- * @v flags Flags
- * @ret drive Drive number, or negative error
- */
- static int efi_block_hook ( unsigned int drive, struct uri **uris,
- unsigned int count, unsigned int flags ) {
- EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
- EFI_DEVICE_PATH_PROTOCOL *end;
- struct efi_block_vendor_path *vendor;
- struct efi_snp_device *snpdev;
- struct san_device *sandev;
- struct efi_block_data *block;
- size_t prefix_len;
- size_t uri_len;
- size_t vendor_len;
- size_t len;
- char *uri_buf;
- EFI_STATUS efirc;
- int rc;
-
- /* Sanity check */
- if ( ! count ) {
- DBG ( "EFIBLK has no URIs\n" );
- rc = -ENOTTY;
- goto err_no_uris;
- }
-
- /* Find an appropriate parent device handle */
- snpdev = last_opened_snpdev();
- if ( ! snpdev ) {
- DBG ( "EFIBLK could not identify SNP device\n" );
- rc = -ENODEV;
- goto err_no_snpdev;
- }
-
- /* Calculate length of private data */
- prefix_len = efi_devpath_len ( snpdev->path );
- uri_len = format_uri ( uris[0], NULL, 0 );
- vendor_len = ( sizeof ( *vendor ) +
- ( ( uri_len + 1 /* NUL */ ) * sizeof ( wchar_t ) ) );
- len = ( sizeof ( *block ) + uri_len + 1 /* NUL */ + prefix_len +
- vendor_len + sizeof ( *end ) );
-
- /* Allocate and initialise structure */
- sandev = alloc_sandev ( uris, count, len );
- if ( ! sandev ) {
- rc = -ENOMEM;
- goto err_alloc;
- }
- block = sandev->priv;
- block->sandev = sandev;
- block->media.MediaPresent = 1;
- block->media.LogicalBlocksPerPhysicalBlock = 1;
- block->block_io.Revision = EFI_BLOCK_IO_PROTOCOL_REVISION3;
- block->block_io.Media = &block->media;
- block->block_io.Reset = efi_block_io_reset;
- block->block_io.ReadBlocks = efi_block_io_read;
- block->block_io.WriteBlocks = efi_block_io_write;
- block->block_io.FlushBlocks = efi_block_io_flush;
- uri_buf = ( ( ( void * ) block ) + sizeof ( *block ) );
- block->path = ( ( ( void * ) uri_buf ) + uri_len + 1 /* NUL */ );
-
- /* Construct device path */
- memcpy ( block->path, snpdev->path, prefix_len );
- vendor = ( ( ( void * ) block->path ) + prefix_len );
- vendor->vendor.Header.Type = HARDWARE_DEVICE_PATH;
- vendor->vendor.Header.SubType = HW_VENDOR_DP;
- vendor->vendor.Header.Length[0] = ( vendor_len & 0xff );
- vendor->vendor.Header.Length[1] = ( vendor_len >> 8 );
- memcpy ( &vendor->vendor.Guid, &ipxe_block_device_path_guid,
- sizeof ( vendor->vendor.Guid ) );
- format_uri ( uris[0], uri_buf, ( uri_len + 1 /* NUL */ ) );
- efi_snprintf ( vendor->uri, ( uri_len + 1 /* NUL */ ), "%s", uri_buf );
- end = ( ( ( void * ) vendor ) + vendor_len );
- end->Type = END_DEVICE_PATH_TYPE;
- end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
- end->Length[0] = sizeof ( *end );
- DBGC ( sandev, "EFIBLK %#02x has device path %s\n",
- drive, efi_devpath_text ( block->path ) );
-
- /* Register SAN device */
- if ( ( rc = register_sandev ( sandev, drive, flags ) ) != 0 ) {
- DBGC ( sandev, "EFIBLK %#02x could not register: %s\n",
- drive, strerror ( rc ) );
- goto err_register;
- }
-
- /* Update media descriptor */
- block->media.BlockSize =
- ( sandev->capacity.blksize << sandev->blksize_shift );
- block->media.LastBlock =
- ( ( sandev->capacity.blocks >> sandev->blksize_shift ) - 1 );
-
- /* Install protocols */
- if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
- &block->handle,
- &efi_block_io_protocol_guid, &block->block_io,
- &efi_device_path_protocol_guid, block->path,
- NULL ) ) != 0 ) {
- rc = -EEFI ( efirc );
- DBGC ( sandev, "EFIBLK %#02x could not install protocols: %s\n",
- sandev->drive, strerror ( rc ) );
- goto err_install;
- }
-
- /* Connect all possible protocols */
- efi_block_connect ( sandev );
-
- return drive;
-
- bs->UninstallMultipleProtocolInterfaces (
- block->handle,
- &efi_block_io_protocol_guid, &block->block_io,
- &efi_device_path_protocol_guid, block->path, NULL );
- err_install:
- unregister_sandev ( sandev );
- err_register:
- sandev_put ( sandev );
- err_alloc:
- err_no_snpdev:
- err_no_uris:
- return rc;
- }
-
- /**
- * Unhook EFI block device
- *
- * @v drive Drive number
- */
- static void efi_block_unhook ( unsigned int drive ) {
- EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
- struct san_device *sandev;
- struct efi_block_data *block;
-
- /* Find SAN device */
- sandev = sandev_find ( drive );
- if ( ! sandev ) {
- DBG ( "EFIBLK cannot find drive %#02x\n", drive );
- return;
- }
- block = sandev->priv;
-
- /* Uninstall protocols */
- bs->UninstallMultipleProtocolInterfaces (
- block->handle,
- &efi_block_io_protocol_guid, &block->block_io,
- &efi_device_path_protocol_guid, block->path, NULL );
-
- /* Unregister SAN device */
- unregister_sandev ( sandev );
-
- /* Drop reference to drive */
- sandev_put ( sandev );
- }
-
- /** An installed ACPI table */
- struct efi_acpi_table {
- /** List of installed tables */
- struct list_head list;
- /** Table key */
- UINTN key;
- };
-
- /** List of installed ACPI tables */
- static LIST_HEAD ( efi_acpi_tables );
-
- /**
- * Install ACPI table
- *
- * @v hdr ACPI description header
- * @ret rc Return status code
- */
- static int efi_block_install ( struct acpi_header *hdr ) {
- size_t len = le32_to_cpu ( hdr->length );
- struct efi_acpi_table *installed;
- EFI_STATUS efirc;
- int rc;
-
- /* Allocate installed table record */
- installed = zalloc ( sizeof ( *installed ) );
- if ( ! installed ) {
- rc = -ENOMEM;
- goto err_alloc;
- }
-
- /* Fill in common parameters */
- strncpy ( hdr->oem_id, "FENSYS", sizeof ( hdr->oem_id ) );
- strncpy ( hdr->oem_table_id, "iPXE", sizeof ( hdr->oem_table_id ) );
-
- /* Fix up ACPI checksum */
- acpi_fix_checksum ( hdr );
-
- /* Install table */
- if ( ( efirc = acpi->InstallAcpiTable ( acpi, hdr, len,
- &installed->key ) ) != 0 ){
- rc = -EEFI ( efirc );
- DBGC ( acpi, "EFIBLK could not install %s: %s\n",
- acpi_name ( hdr->signature ), strerror ( rc ) );
- DBGC_HDA ( acpi, 0, hdr, len );
- goto err_install;
- }
-
- /* Add to list of installed tables */
- list_add_tail ( &installed->list, &efi_acpi_tables );
-
- DBGC ( acpi, "EFIBLK installed %s as ACPI table %#lx:\n",
- acpi_name ( hdr->signature ),
- ( ( unsigned long ) installed->key ) );
- DBGC_HDA ( acpi, 0, hdr, len );
- return 0;
-
- list_del ( &installed->list );
- err_install:
- free ( installed );
- err_alloc:
- return rc;
- }
-
- /**
- * Describe EFI block devices
- *
- * @ret rc Return status code
- */
- static int efi_block_describe ( void ) {
- struct efi_acpi_table *installed;
- struct efi_acpi_table *tmp;
- UINTN key;
- EFI_STATUS efirc;
- int rc;
-
- /* Sanity check */
- if ( ! acpi ) {
- DBG ( "EFIBLK has no ACPI table protocol\n" );
- return -ENOTSUP;
- }
-
- /* Uninstall any existing ACPI tables */
- list_for_each_entry_safe ( installed, tmp, &efi_acpi_tables, list ) {
- key = installed->key;
- if ( ( efirc = acpi->UninstallAcpiTable ( acpi, key ) ) != 0 ) {
- rc = -EEFI ( efirc );
- DBGC ( acpi, "EFIBLK could not uninstall ACPI table "
- "%#lx: %s\n", ( ( unsigned long ) key ),
- strerror ( rc ) );
- /* Continue anyway */
- }
- list_del ( &installed->list );
- free ( installed );
- }
-
- /* Install ACPI tables */
- if ( ( rc = acpi_install ( efi_block_install ) ) != 0 ) {
- DBGC ( acpi, "EFIBLK could not install ACPI tables: %s\n",
- strerror ( rc ) );
- return rc;
- }
-
- return 0;
- }
-
- /**
- * Try booting from child device of EFI block device
- *
- * @v sandev SAN device
- * @v handle EFI handle
- * @v filename Filename (or NULL to use default)
- * @v image Image handle to fill in
- * @ret rc Return status code
- */
- static int efi_block_boot_image ( struct san_device *sandev, EFI_HANDLE handle,
- const char *filename, EFI_HANDLE *image ) {
- EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
- struct efi_block_data *block = sandev->priv;
- union {
- EFI_DEVICE_PATH_PROTOCOL *path;
- void *interface;
- } path;
- EFI_DEVICE_PATH_PROTOCOL *boot_path;
- FILEPATH_DEVICE_PATH *filepath;
- EFI_DEVICE_PATH_PROTOCOL *end;
- size_t prefix_len;
- size_t filepath_len;
- size_t boot_path_len;
- EFI_STATUS efirc;
- int rc;
-
- /* Identify device path */
- if ( ( efirc = bs->OpenProtocol ( handle,
- &efi_device_path_protocol_guid,
- &path.interface, efi_image_handle,
- handle,
- EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
- DBGC ( sandev, "EFIBLK %#02x found filesystem with no device "
- "path??", sandev->drive );
- rc = -EEFI ( efirc );
- goto err_open_device_path;
- }
-
- /* Check if this device is a child of our block device */
- prefix_len = efi_devpath_len ( block->path );
- if ( memcmp ( path.path, block->path, prefix_len ) != 0 ) {
- /* Not a child device */
- rc = -ENOTTY;
- goto err_not_child;
- }
- DBGC ( sandev, "EFIBLK %#02x found child device %s\n",
- sandev->drive, efi_devpath_text ( path.path ) );
-
- /* Construct device path for boot image */
- end = efi_devpath_end ( path.path );
- prefix_len = ( ( ( void * ) end ) - ( ( void * ) path.path ) );
- filepath_len = ( SIZE_OF_FILEPATH_DEVICE_PATH +
- ( filename ?
- ( ( strlen ( filename ) + 1 /* NUL */ ) *
- sizeof ( filepath->PathName[0] ) ) :
- sizeof ( efi_block_boot_filename ) ) );
- boot_path_len = ( prefix_len + filepath_len + sizeof ( *end ) );
- boot_path = zalloc ( boot_path_len );
- if ( ! boot_path ) {
- rc = -ENOMEM;
- goto err_alloc_path;
- }
- memcpy ( boot_path, path.path, prefix_len );
- filepath = ( ( ( void * ) boot_path ) + prefix_len );
- filepath->Header.Type = MEDIA_DEVICE_PATH;
- filepath->Header.SubType = MEDIA_FILEPATH_DP;
- filepath->Header.Length[0] = ( filepath_len & 0xff );
- filepath->Header.Length[1] = ( filepath_len >> 8 );
- if ( filename ) {
- efi_sprintf ( filepath->PathName, "%s", filename );
- } else {
- memcpy ( filepath->PathName, efi_block_boot_filename,
- sizeof ( efi_block_boot_filename ) );
- }
- end = ( ( ( void * ) filepath ) + filepath_len );
- end->Type = END_DEVICE_PATH_TYPE;
- end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
- end->Length[0] = sizeof ( *end );
- DBGC ( sandev, "EFIBLK %#02x trying to load %s\n",
- sandev->drive, efi_devpath_text ( boot_path ) );
-
- /* Try loading boot image from this device */
- if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, boot_path,
- NULL, 0, image ) ) != 0 ) {
- rc = -EEFI ( efirc );
- DBGC ( sandev, "EFIBLK %#02x could not load image: %s\n",
- sandev->drive, strerror ( rc ) );
- goto err_load_image;
- }
-
- /* Success */
- rc = 0;
-
- err_load_image:
- free ( boot_path );
- err_alloc_path:
- err_not_child:
- err_open_device_path:
- return rc;
- }
-
- /**
- * Boot from EFI block device
- *
- * @v drive Drive number
- * @v filename Filename (or NULL to use default)
- * @ret rc Return status code
- */
- static int efi_block_boot ( unsigned int drive, const char *filename ) {
- EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
- struct san_device *sandev;
- EFI_HANDLE *handles;
- EFI_HANDLE image = NULL;
- UINTN count;
- unsigned int i;
- EFI_STATUS efirc;
- int rc;
-
- /* Find SAN device */
- sandev = sandev_find ( drive );
- if ( ! sandev ) {
- DBG ( "EFIBLK cannot find drive %#02x\n", drive );
- rc = -ENODEV;
- goto err_sandev_find;
- }
-
- /* Release SNP devices */
- efi_snp_release();
-
- /* Connect all possible protocols */
- efi_block_connect ( sandev );
-
- /* Locate all handles supporting the Simple File System protocol */
- if ( ( efirc = bs->LocateHandleBuffer (
- ByProtocol, &efi_simple_file_system_protocol_guid,
- NULL, &count, &handles ) ) != 0 ) {
- rc = -EEFI ( efirc );
- DBGC ( sandev, "EFIBLK %#02x cannot locate file systems: %s\n",
- sandev->drive, strerror ( rc ) );
- goto err_locate_file_systems;
- }
-
- /* Try booting from any available child device containing a
- * suitable boot image. This is something of a wild stab in
- * the dark, but should end up conforming to user expectations
- * most of the time.
- */
- rc = -ENOENT;
- for ( i = 0 ; i < count ; i++ ) {
- if ( ( rc = efi_block_boot_image ( sandev, handles[i], filename,
- &image ) ) != 0 )
- continue;
- DBGC ( sandev, "EFIBLK %#02x found boot image\n",
- sandev->drive );
- efirc = bs->StartImage ( image, NULL, NULL );
- rc = ( efirc ? -EEFI ( efirc ) : 0 );
- bs->UnloadImage ( image );
- DBGC ( sandev, "EFIBLK %#02x boot image returned: %s\n",
- sandev->drive, strerror ( rc ) );
- break;
- }
-
- bs->FreePool ( handles );
- err_locate_file_systems:
- efi_snp_claim();
- err_sandev_find:
- return rc;
- }
-
- PROVIDE_SANBOOT ( efi, san_hook, efi_block_hook );
- PROVIDE_SANBOOT ( efi, san_unhook, efi_block_unhook );
- PROVIDE_SANBOOT ( efi, san_describe, efi_block_describe );
- PROVIDE_SANBOOT ( efi, san_boot, efi_block_boot );
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