/
efi_block.c
1096 lines (978 loc) · 28.7 KB
/
efi_block.c
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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 <stdio.h>
#include <string.h>
#include <strings.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/Guid/FileSystemInfo.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_strings.h>
#include <ipxe/efi/efi_snp.h>
#include <ipxe/efi/efi_path.h>
#include <ipxe/efi/efi_null.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;
/** 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->drive, "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->drive, "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->drive, "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->drive, "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->drive, "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->drive, "EFIBLK %#02x flush\n", sandev->drive );
/* Nothing to do */
return 0;
}
/**
* Connect all possible drivers to EFI block device
*
* @v drive Drive number
* @v handle Block device handle
*/
static void efi_block_connect ( unsigned int drive, EFI_HANDLE handle ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
/* Try to connect all possible drivers to this block device */
if ( ( efirc = bs->ConnectController ( handle, NULL, NULL,
TRUE ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not connect drivers: %s\n",
drive, strerror ( rc ) );
/* May not be an error; may already be connected */
}
DBGC2 ( drive, "EFIBLK %#02x supports protocols:\n", drive );
DBGC2_EFI_PROTOCOLS ( drive, 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;
struct san_device *sandev;
struct efi_block_data *block;
int leak = 0;
EFI_STATUS efirc;
int rc;
/* Sanity check */
if ( ! count ) {
DBGC ( drive, "EFIBLK %#02x has no URIs\n", drive );
rc = -ENOTTY;
goto err_no_uris;
}
/* Allocate and initialise structure */
sandev = alloc_sandev ( uris, count, sizeof ( *block ) );
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;
/* Register SAN device */
if ( ( rc = register_sandev ( sandev, drive, flags ) ) != 0 ) {
DBGC ( drive, "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 );
/* Construct device path */
if ( ! sandev->active ) {
rc = -ENODEV;
DBGC ( drive, "EFIBLK %#02x not active after registration\n",
drive );
goto err_active;
}
block->path = efi_describe ( &sandev->active->block );
if ( ! block->path ) {
rc = -ENODEV;
DBGC ( drive, "EFIBLK %#02x has no device path\n", drive );
goto err_describe;
}
DBGC2 ( drive, "EFIBLK %#02x has device path %s\n",
drive, efi_devpath_text ( block->path ) );
/* 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 ( drive, "EFIBLK %#02x could not install protocols: %s\n",
drive, strerror ( rc ) );
goto err_install;
}
DBGC ( drive, "EFIBLK %#02x installed as SAN drive %s\n",
drive, efi_handle_name ( block->handle ) );
/* Connect all possible protocols */
efi_block_connect ( drive, block->handle );
return drive;
if ( ( efirc = bs->UninstallMultipleProtocolInterfaces (
block->handle,
&efi_block_io_protocol_guid, &block->block_io,
&efi_device_path_protocol_guid, block->path,
NULL ) ) != 0 ) {
DBGC ( drive, "EFIBLK %#02x could not uninstall protocols: "
"%s\n", drive, strerror ( -EEFI ( efirc ) ) );
leak = 1;
}
efi_nullify_block ( &block->block_io );
err_install:
if ( ! leak ) {
free ( block->path );
block->path = NULL;
}
err_describe:
err_active:
unregister_sandev ( sandev );
err_register:
if ( ! leak )
sandev_put ( sandev );
err_alloc:
err_no_uris:
if ( leak )
DBGC ( drive, "EFIBLK %#02x nullified and leaked\n", drive );
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;
int leak = efi_shutdown_in_progress;
EFI_STATUS efirc;
/* Find SAN device */
sandev = sandev_find ( drive );
if ( ! sandev ) {
DBGC ( drive, "EFIBLK %#02x is not a SAN drive\n", drive );
return;
}
block = sandev->priv;
/* Uninstall protocols */
if ( ( ! efi_shutdown_in_progress ) &&
( ( efirc = bs->UninstallMultipleProtocolInterfaces (
block->handle,
&efi_block_io_protocol_guid, &block->block_io,
&efi_device_path_protocol_guid, block->path,
NULL ) ) != 0 ) ) {
DBGC ( drive, "EFIBLK %#02x could not uninstall protocols: "
"%s\n", drive, strerror ( -EEFI ( efirc ) ) );
leak = 1;
}
efi_nullify_block ( &block->block_io );
/* Free device path */
if ( ! leak ) {
free ( block->path );
block->path = NULL;
}
/* Unregister SAN device */
unregister_sandev ( sandev );
/* Drop reference to drive */
if ( ! leak )
sandev_put ( sandev );
/* Report leakage, if applicable */
if ( leak && ( ! efi_shutdown_in_progress ) )
DBGC ( drive, "EFIBLK %#02x nullified and leaked\n", drive );
}
/** 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 ) );
DBGC2_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 ) );
DBGC2_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;
}
/**
* Open root directory within a filesystem
*
* @v drive Drive number
* @v handle Filesystem handle
* @v root Root directory file to fill in
* @ret rc Return status code
*/
static int efi_block_root ( unsigned int drive, EFI_HANDLE handle,
EFI_FILE_PROTOCOL **root ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_GUID *protocol = &efi_simple_file_system_protocol_guid;
union {
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fs;
void *interface;
} u;
EFI_STATUS efirc;
int rc;
/* Open filesystem protocol */
if ( ( efirc = bs->OpenProtocol ( handle, protocol, &u.interface,
efi_image_handle, handle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not open %s filesystem: %s\n",
drive, efi_handle_name ( handle ), strerror ( rc ) );
goto err_open;
}
/* Open root volume */
if ( ( efirc = u.fs->OpenVolume ( u.fs, root ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not open %s root: %s\n",
drive, efi_handle_name ( handle ), strerror ( rc ) );
goto err_volume;
}
/* Success */
rc = 0;
err_volume:
bs->CloseProtocol ( handle, protocol, efi_image_handle, handle );
err_open:
return rc;
}
/**
* Check for existence of a file within a filesystem
*
* @v drive Drive number
* @v handle Filesystem handle
* @v root Root directory
* @v filename Filename (or NULL to use default)
* @ret rc Return status code
*/
static int efi_block_filename ( unsigned int drive, EFI_HANDLE handle,
EFI_FILE_PROTOCOL *root,
const char *filename ) {
CHAR16 tmp[ filename ? ( strlen ( filename ) + 1 /* wNUL */ ) : 0 ];
CHAR16 *wname;
EFI_FILE_PROTOCOL *file;
EFI_STATUS efirc;
int rc;
/* Construct filename */
if ( filename ) {
efi_snprintf ( tmp, sizeof ( tmp ), "%s", filename );
wname = tmp;
} else {
wname = efi_block_boot_filename;
}
/* Try opening file */
if ( ( efirc = root->Open ( root, &file, wname,
EFI_FILE_MODE_READ, 0 ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not open %s/%ls: %s\n",
drive, efi_handle_name ( handle ), wname,
strerror ( rc ) );
goto err_file;
}
/* Success */
rc = 0;
file->Close ( file );
err_file:
return rc;
}
/**
* Check for EFI block device filesystem label
*
* @v drive Drive number
* @v root Root directory
* @v label Volume label
* @ret rc Return status code
*/
static int efi_block_label ( unsigned int drive, EFI_FILE_PROTOCOL *root,
const char *label ) {
EFI_FILE_SYSTEM_INFO *info;
UINTN size;
char *actual;
EFI_STATUS efirc;
int rc;
/* Get length of file system information */
size = 0;
root->GetInfo ( root, &efi_file_system_info_id, &size, NULL );
/* Allocate file system information */
info = malloc ( size );
if ( ! info ) {
rc = -ENOMEM;
goto err_alloc_info;
}
/* Get file system information */
if ( ( efirc = root->GetInfo ( root, &efi_file_system_info_id, &size,
info ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not get filesystem info: "
"%s\n", drive, strerror ( rc ) );
goto err_get_info;
}
/* Construct volume label for comparison */
if ( asprintf ( &actual, "%ls", info->VolumeLabel ) < 0 ) {
rc = -ENOMEM;
goto err_alloc_label;
}
/* Compare volume label */
if ( strcasecmp ( label, actual ) != 0 ) {
DBGC ( drive, "EFIBLK %#02x has wrong label \"%s\"\n",
drive, actual );
rc = -ENOENT;
goto err_compare;
}
/* Success */
rc = 0;
err_compare:
free ( actual );
err_alloc_label:
err_get_info:
free ( info );
err_alloc_info:
return rc;
}
/**
* Check EFI block device filesystem match
*
* @v drive Drive number
* @v handle Filesystem handle
* @v path Block device path
* @v config Boot configuration parameters
* @v fspath Filesystem device path to fill in
* @ret rc Return status code
*/
static int efi_block_match ( unsigned int drive, EFI_HANDLE handle,
EFI_DEVICE_PATH_PROTOCOL *path,
struct san_boot_config *config,
EFI_DEVICE_PATH_PROTOCOL **fspath ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_GUID *protocol = &efi_device_path_protocol_guid;
union {
EFI_DEVICE_PATH_PROTOCOL *path;
void *interface;
} u;
EFI_FILE *root;
union uuid guid;
EFI_STATUS efirc;
int rc;
/* Identify device path */
if ( ( efirc = bs->OpenProtocol ( handle, protocol, &u.interface,
efi_image_handle, handle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not open %s device path: "
"%s\n", drive, efi_handle_name ( handle ),
strerror ( rc ) );
goto err_open;
}
*fspath = u.path;
/* Check if filesystem is a child of this block device */
if ( memcmp ( u.path, path, efi_path_len ( path ) ) != 0 ) {
/* Not a child device */
rc = -ENOTTY;
DBGC2 ( drive, "EFIBLK %#02x is not parent of %s\n",
drive, efi_handle_name ( handle ) );
goto err_not_child;
}
DBGC ( drive, "EFIBLK %#02x contains filesystem %s\n",
drive, efi_devpath_text ( u.path ) );
/* Check if filesystem matches GUID, if applicable */
if ( config->uuid ) {
if ( ( rc = efi_path_guid ( u.path, &guid ) ) != 0 ) {
DBGC ( drive, "EFIBLK %#02x could not determine GUID: "
"%s\n", drive, strerror ( rc ) );
goto err_no_guid;
}
if ( memcmp ( config->uuid, &guid, sizeof ( guid ) ) != 0 ) {
DBGC ( drive, "EFIBLK %#02x has wrong GUID %s\n",
drive, uuid_ntoa ( &guid ) );
rc = -ENOENT;
goto err_wrong_guid;
}
}
/* Open root directory */
if ( ( rc = efi_block_root ( drive, handle, &root ) ) != 0 )
goto err_root;
/* Check if filesystem contains boot filename */
if ( ( rc = efi_block_filename ( drive, handle, root,
config->filename ) ) != 0 ) {
goto err_filename;
}
/* Check if filesystem contains additional filename, if applicable */
if ( config->extra &&
( ( rc = efi_block_filename ( drive, handle, root,
config->extra ) ) != 0 ) ) {
goto err_extra;
}
/* Check volume label, if applicable */
if ( config->label &&
( ( rc = efi_block_label ( drive, root,
config->label ) ) != 0 ) ) {
goto err_label;
}
/* Success */
rc = 0;
err_label:
err_extra:
err_filename:
root->Close ( root );
err_root:
err_wrong_guid:
err_no_guid:
err_not_child:
bs->CloseProtocol ( handle, protocol, efi_image_handle, handle );
err_open:
return rc;
}
/**
* Scan EFI block device for a matching filesystem
*
* @v drive Drive number
* @v handle Block device handle
* @v config Boot configuration parameters
* @v fspath Filesystem device path to fill in
* @ret rc Return status code
*/
static int efi_block_scan ( unsigned int drive, EFI_HANDLE handle,
struct san_boot_config *config,
EFI_DEVICE_PATH_PROTOCOL **fspath ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_GUID *protocol = &efi_device_path_protocol_guid;
union {
EFI_DEVICE_PATH_PROTOCOL *path;
void *interface;
} u;
EFI_HANDLE *handles;
UINTN count;
unsigned int i;
EFI_STATUS efirc;
int rc;
/* Connect up possible file system drivers */
efi_block_connect ( drive, handle );
/* Identify device path */
if ( ( efirc = bs->OpenProtocol ( handle, protocol, &u.interface,
efi_image_handle, handle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not open device path: %s\n",
drive, strerror ( rc ) );
goto err_open;
}
/* Locate all Simple File System protocol handles */
if ( ( efirc = bs->LocateHandleBuffer (
ByProtocol, &efi_simple_file_system_protocol_guid,
NULL, &count, &handles ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x cannot locate file systems: %s\n",
drive, strerror ( rc ) );
goto err_locate;
}
/* Scan for a matching filesystem */
rc = -ENOENT;
for ( i = 0 ; i < count ; i++ ) {
/* Check for a matching filesystem */
if ( ( rc = efi_block_match ( drive, handles[i], u.path,
config, fspath ) ) != 0 )
continue;
break;
}
bs->FreePool ( handles );
err_locate:
bs->CloseProtocol ( handle, protocol, efi_image_handle, handle );
err_open:
return rc;
}
/**
* Boot from EFI block device filesystem boot image
*
* @v drive Drive number
* @v fspath Filesystem device path
* @v filename Filename (or NULL to use default)
* @ret rc Return status code
*/
static int efi_block_exec ( unsigned int drive,
EFI_DEVICE_PATH_PROTOCOL *fspath,
const char *filename ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_DEVICE_PATH_PROTOCOL *path;
FILEPATH_DEVICE_PATH *filepath;
EFI_DEVICE_PATH_PROTOCOL *end;
EFI_HANDLE image;
size_t fspath_len;
size_t filepath_len;
size_t path_len;
EFI_STATUS efirc;
int rc;
/* Construct device path for boot image */
end = efi_path_end ( fspath );
fspath_len = ( ( ( void * ) end ) - ( ( void * ) fspath ) );
filepath_len = ( SIZE_OF_FILEPATH_DEVICE_PATH +
( filename ?
( ( strlen ( filename ) + 1 /* NUL */ ) *
sizeof ( filepath->PathName[0] ) ) :
sizeof ( efi_block_boot_filename ) ) );
path_len = ( fspath_len + filepath_len + sizeof ( *end ) );
path = zalloc ( path_len );
if ( ! path ) {
rc = -ENOMEM;
goto err_alloc;
}
memcpy ( path, fspath, fspath_len );
filepath = ( ( ( void * ) path ) + fspath_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 );
efi_path_terminate ( end );
DBGC ( drive, "EFIBLK %#02x trying to load %s\n",
drive, efi_devpath_text ( path ) );
/* Load image */
image = NULL;
if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, path, NULL, 0,
&image ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not load: %s\n",
drive, strerror ( rc ) );
if ( efirc == EFI_SECURITY_VIOLATION ) {
goto err_load_security_violation;
} else {
goto err_load;
}
}
/* Start image */
efirc = bs->StartImage ( image, NULL, NULL );
rc = ( efirc ? -EEFI ( efirc ) : 0 );
DBGC ( drive, "EFIBLK %#02x boot image returned: %s\n",
drive, strerror ( rc ) );
err_load_security_violation:
bs->UnloadImage ( image );
err_load:
free ( path );
err_alloc:
return rc;
}
/**
* Check that EFI block device is eligible for a local virtual drive number
*
* @v handle Block device handle
* @ret rc Return status code
*
* We assign virtual drive numbers for local (non-SAN) EFI block
* devices that represent complete disks, to provide roughly
* equivalent functionality to BIOS drive numbers.
*/
static int efi_block_local ( EFI_HANDLE handle ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_GUID *protocol = &efi_block_io_protocol_guid;
struct san_device *sandev;
struct efi_block_data *block;
union {
EFI_BLOCK_IO_PROTOCOL *blockio;
void *interface;
} u;
EFI_STATUS efirc;
int rc;
/* Check if handle belongs to a SAN device */
for_each_sandev ( sandev ) {
block = sandev->priv;
if ( handle == block->handle ) {
rc = -ENOTTY;
goto err_sandev;
}
}
/* Open block I/O protocol */
if ( ( efirc = bs->OpenProtocol ( handle, protocol, &u.interface,
efi_image_handle, handle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( handle, "EFIBLK %s could not open block I/O: %s\n",
efi_handle_name ( handle ), strerror ( rc ) );
goto err_open;
}
/* Do not assign drive numbers for partitions */
if ( u.blockio->Media->LogicalPartition ) {
rc = -ENOTTY;
DBGC2 ( handle, "EFLBLK %s is a partition\n",
efi_handle_name ( handle ) );
goto err_partition;
}
/* Success */
rc = 0;
err_partition:
bs->CloseProtocol ( handle, protocol, efi_image_handle, handle );
err_open:
err_sandev:
return rc;
}
/**
* Boot from EFI block device
*
* @v drive Drive number
* @v config Boot configuration parameters
* @ret rc Return status code
*/
static int efi_block_boot ( unsigned int drive,
struct san_boot_config *config ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_DEVICE_PATH_PROTOCOL *fspath = NULL;
EFI_HANDLE *handles;
EFI_HANDLE handle;
UINTN count;
struct san_device *sandev;
struct efi_block_data *block;
unsigned int vdrive;
unsigned int index;
EFI_STATUS efirc;
int rc;
/* Release SNP devices */
efi_snp_release();
/* Locate all block I/O protocol handles */
if ( ( efirc = bs->LocateHandleBuffer ( ByProtocol,
&efi_block_io_protocol_guid,
NULL, &count,
&handles ) ) != 0 ) {