efi_block.c File Reference

EFI block device protocols. More...

#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_wrap.h>
#include <ipxe/efi/efi_block.h>

Go to the source code of this file.

Data Structures
struct	efi_block_data
	EFI SAN device private data. More...
struct	efi_acpi_table
	An installed ACPI table. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
	EFI_REQUEST_PROTOCOL (EFI_ACPI_TABLE_PROTOCOL, &acpi)
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, void *buffer))
	Read from or write to EFI block device. More...
static EFI_STATUS EFIAPI	efi_block_io_reset (EFI_BLOCK_IO_PROTOCOL *block_io, BOOLEAN verify __unused)
	Reset EFI block device. More...
static EFI_STATUS EFIAPI	efi_block_io_read (EFI_BLOCK_IO_PROTOCOL *block_io, UINT32 media __unused, EFI_LBA lba, UINTN len, VOID *data)
	Read from EFI block device. More...
static EFI_STATUS EFIAPI	efi_block_io_write (EFI_BLOCK_IO_PROTOCOL *block_io, UINT32 media __unused, EFI_LBA lba, UINTN len, VOID *data)
	Write to EFI block device. More...
static EFI_STATUS EFIAPI	efi_block_io_flush (EFI_BLOCK_IO_PROTOCOL *block_io)
	Flush data to EFI block device. More...
static void	efi_block_connect (unsigned int drive, EFI_HANDLE handle)
	Connect all possible drivers to EFI block device. More...
static int	efi_block_hook (unsigned int drive, struct uri **uris, unsigned int count, unsigned int flags)
	Hook EFI block device. More...
static void	efi_block_unhook (unsigned int drive)
	Unhook EFI block device. More...
static	LIST_HEAD (efi_acpi_tables)
	List of installed ACPI tables. More...
static int	efi_block_install (struct acpi_header *hdr)
	Install ACPI table. More...
static int	efi_block_describe (void)
	Describe EFI block devices. More...
static int	efi_block_root (unsigned int drive, EFI_HANDLE handle, EFI_FILE_PROTOCOL **root)
	Open root directory within a filesystem. More...
static int	efi_block_filename (unsigned int drive, EFI_HANDLE handle, EFI_FILE_PROTOCOL *root, const char *filename)
	Check for existence of a file within a filesystem. More...
static int	efi_block_label (unsigned int drive, EFI_FILE_PROTOCOL *root, const char *label)
	Check for EFI block device filesystem label. More...
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)
	Check EFI block device filesystem match. More...
static int	efi_block_scan (unsigned int drive, EFI_HANDLE handle, struct san_boot_config *config, EFI_DEVICE_PATH_PROTOCOL **fspath)
	Scan EFI block device for a matching filesystem. More...
static int	efi_block_exec (unsigned int drive, EFI_DEVICE_PATH_PROTOCOL *fspath, const char *filename)
	Boot from EFI block device filesystem boot image. More...
static int	efi_block_local (EFI_HANDLE handle)
	Check that EFI block device is eligible for a local virtual drive number. More...
static int	efi_block_boot (unsigned int drive, struct san_boot_config *config)
	Boot from EFI block device. More...
	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)

Variables
static EFI_ACPI_TABLE_PROTOCOL *	acpi
	ACPI table protocol protocol. More...
static wchar_t	efi_block_boot_filename [] = EFI_REMOVABLE_MEDIA_FILE_NAME
	Boot filename. More...

Detailed Description

EFI block device protocols.

Definition in file efi_block.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

EFI_REQUEST_PROTOCOL()

EFI_REQUEST_PROTOCOL	(	EFI_ACPI_TABLE_PROTOCOL	,
		&	acpi
	)

efi_block_rw()

static int efi_block_rw ( struct san_device *  sandev, uint64_t  lba, void *  data, size_t  len, int(*)(struct san_device *sandev, uint64_t lba, unsigned int count, void *buffer)  sandev_rw  )

static

Read from or write to EFI block device.

Parameters

sandev	SAN device
lba	Starting LBA
data	Data buffer
len	Size of buffer
sandev_rw	SAN device read/write method

Return values

rc	Return status code

Definition at line 97 of file efi_block.c.

                                                                 {
        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, data ) ) != 0 ) {
                DBGC ( sandev->drive, "EFIBLK %#02x I/O failed: %s\n",
                       sandev->drive, strerror ( rc ) );
                return rc;
        }

        return 0;
}

References block, count, data, DBGC, san_device::drive, EINVAL, lba, len, san_device::priv, rc, efi_block_data::sandev, sandev_rw(), and strerror().

Referenced by efi_block_io_read(), and efi_block_io_write().

efi_block_io_reset()

static EFI_STATUS EFIAPI efi_block_io_reset ( EFI_BLOCK_IO_PROTOCOL *  block_io, BOOLEAN verify  __unused  )

static

Reset EFI block device.

Parameters

block_io	Block I/O protocol
verify	Perform extended verification

Return values

efirc

EFI status code

Definition at line 132 of file efi_block.c.

                                                                        {
        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 );
}

References block, efi_block_data::block_io, container_of, DBGC2, san_device::drive, efi_snp_claim(), efi_snp_release(), EFIRC, rc, and sandev_reset().

Referenced by efi_block_hook().

efi_block_io_read()

static EFI_STATUS EFIAPI efi_block_io_read ( EFI_BLOCK_IO_PROTOCOL *  block_io, UINT32 media  __unused, EFI_LBA  lba, UINTN  len, VOID *  data  )

static

Read from EFI block device.

Parameters

block_io	Block I/O protocol
media	Media identifier
lba	Starting LBA
len	Size of buffer
data	Data buffer

Return values

efirc

EFI status code

Definition at line 157 of file efi_block.c.

                                                         {
        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 );
}

References block, efi_block_data::block_io, container_of, data, DBGC2, san_device::drive, efi_block_rw(), efi_snp_claim(), efi_snp_release(), EFIRC, lba, len, rc, and sandev_read().

Referenced by efi_block_hook().

efi_block_io_write()

static EFI_STATUS EFIAPI efi_block_io_write ( EFI_BLOCK_IO_PROTOCOL *  block_io, UINT32 media  __unused, EFI_LBA  lba, UINTN  len, VOID *  data  )

static

Write to EFI block device.

Parameters

block_io	Block I/O protocol
media	Media identifier
lba	Starting LBA
len	Size of buffer
data	Data buffer

Return values

efirc

EFI status code

Definition at line 183 of file efi_block.c.

                                                          {
        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 );
}

References block, efi_block_data::block_io, container_of, data, DBGC2, san_device::drive, efi_block_rw(), efi_snp_claim(), efi_snp_release(), EFIRC, lba, len, rc, and sandev_write().

Referenced by efi_block_hook().

efi_block_io_flush()

static EFI_STATUS EFIAPI efi_block_io_flush ( EFI_BLOCK_IO_PROTOCOL *  block_io )

static

Flush data to EFI block device.

Parameters

block_io

Block I/O protocol

Return values

efirc

EFI status code

Definition at line 205 of file efi_block.c.

                                                       {
        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;
}

References block, efi_block_data::block_io, container_of, DBGC2, and san_device::drive.

Referenced by efi_block_hook().

efi_block_connect()

static void efi_block_connect ( unsigned int  drive, EFI_HANDLE  handle  )

static

Connect all possible drivers to EFI block device.

Parameters

drive	Drive number
handle	Block device handle

Definition at line 222 of file efi_block.c.

                                                                        {
        int rc;

        /* Try to connect all possible drivers to this block device */
        if ( ( rc = efi_connect ( handle, NULL ) ) != 0 ) {
                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 );
}

References DBGC, DBGC2, DBGC2_EFI_PROTOCOLS, drive, efi_connect(), handle, NULL, rc, and strerror().

Referenced by efi_block_hook(), and efi_block_scan().

efi_block_hook()

static int efi_block_hook ( unsigned int  drive, struct uri **  uris, unsigned int  count, unsigned int  flags  )

static

Hook EFI block device.

Parameters

drive	Drive number
uris	List of URIs
count	Number of URIs
flags	Flags

Return values

drive

Drive number, or negative error

Definition at line 244 of file efi_block.c.

                                                                     {
        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;
}

References san_device::active, alloc_sandev(), block_device_capacity::blksize, san_device::blksize_shift, block, san_path::block, block_device_capacity::blocks, EFI_SYSTEM_TABLE::BootServices, san_device::capacity, count, DBGC, DBGC2, drive, EEFI, efi_block_connect(), efi_block_io_flush(), efi_block_io_protocol_guid, EFI_BLOCK_IO_PROTOCOL_REVISION3, efi_block_io_read(), efi_block_io_reset(), efi_block_io_write(), efi_describe(), efi_device_path_protocol_guid, efi_devpath_text(), efi_handle_name(), efi_nullify_block(), efi_systab, ENODEV, ENOMEM, ENOTTY, flags, free, EFI_BOOT_SERVICES::InstallMultipleProtocolInterfaces, NULL, san_device::priv, rc, register_sandev(), efi_block_data::sandev, sandev_put(), strerror(), EFI_BOOT_SERVICES::UninstallMultipleProtocolInterfaces, and unregister_sandev().

efi_block_unhook()

static void efi_block_unhook ( unsigned int  drive )

static

Unhook EFI block device.

Parameters

drive

Drive number

Definition at line 358 of file efi_block.c.

                                                    {
        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 );
}

References block, EFI_SYSTEM_TABLE::BootServices, DBGC, drive, EEFI, efi_block_io_protocol_guid, efi_device_path_protocol_guid, efi_nullify_block(), efi_shutdown_in_progress, efi_systab, free, NULL, san_device::priv, efi_block_data::sandev, sandev_find(), sandev_put(), strerror(), EFI_BOOT_SERVICES::UninstallMultipleProtocolInterfaces, and unregister_sandev().

LIST_HEAD()

static LIST_HEAD ( efi_acpi_tables  )

static

List of installed ACPI tables.

efi_block_install()

static int efi_block_install ( struct acpi_header *  hdr )

static

Install ACPI table.

Parameters

hdr	ACPI description header

Return values

rc	Return status code

Definition at line 421 of file efi_block.c.

                                                         {
        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;
}

References acpi, acpi_fix_checksum(), acpi_name(), DBGC, DBGC2_HDA, EEFI, ENOMEM, free, hdr, _EFI_ACPI_TABLE_PROTOCOL::InstallAcpiTable, efi_acpi_table::key, le32_to_cpu, len, efi_acpi_table::list, list_add_tail, list_del, rc, strerror(), strncpy(), and zalloc().

Referenced by efi_block_describe().

efi_block_describe()

static int efi_block_describe ( void  )

static

Describe EFI block devices.

Return values

rc	Return status code

Definition at line 472 of file efi_block.c.

                                       {
        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;
}

References acpi, acpi_install(), DBG, DBGC, EEFI, efi_block_install(), ENOTSUP, free, key, efi_acpi_table::key, efi_acpi_table::list, list_del, list_for_each_entry_safe, rc, strerror(), tmp, and _EFI_ACPI_TABLE_PROTOCOL::UninstallAcpiTable.

efi_block_root()

static int efi_block_root ( unsigned int  drive, EFI_HANDLE  handle, EFI_FILE_PROTOCOL **  root  )

static

Open root directory within a filesystem.

Parameters

drive	Drive number
handle	Filesystem handle
root	Root directory file to fill in

Return values

rc	Return status code

Definition at line 517 of file efi_block.c.

                                                       {
        EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fs;
        EFI_STATUS efirc;
        int rc;

        /* Open filesystem protocol */
        if ( ( rc = efi_open ( handle, &efi_simple_file_system_protocol_guid,
                               &fs ) ) != 0 ) {
                DBGC ( drive, "EFIBLK %#02x could not open %s filesystem: %s\n",
                       drive, efi_handle_name ( handle ), strerror ( rc ) );
                return rc;
        }

        /* Open root volume */
        if ( ( efirc = fs->OpenVolume ( fs, root ) ) != 0 ) {
                rc = -EEFI ( efirc );
                DBGC ( drive, "EFIBLK %#02x could not open %s root: %s\n",
                       drive, efi_handle_name ( handle ), strerror ( rc ) );
                return rc;
        }

        return 0;
}

References DBGC, drive, EEFI, efi_handle_name(), efi_open, efi_simple_file_system_protocol_guid, fs, handle, rc, root, and strerror().

Referenced by efi_block_match().

efi_block_filename()

static int efi_block_filename ( unsigned int  drive, EFI_HANDLE  handle, EFI_FILE_PROTOCOL *  root, const char *  filename  )

static

Check for existence of a file within a filesystem.

Parameters

drive	Drive number
handle	Filesystem handle
root	Root directory
filename	Filename (or NULL to use default)

Return values

rc	Return status code

Definition at line 551 of file efi_block.c.

                                                       {
        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;
}

References _EFI_FILE_PROTOCOL::Close, DBGC, drive, EEFI, efi_block_boot_filename, EFI_FILE_MODE_READ, efi_handle_name(), efi_snprintf(), handle, rc, root, strerror(), strlen(), and tmp.

Referenced by efi_block_match().

efi_block_label()

static int efi_block_label ( unsigned int  drive, EFI_FILE_PROTOCOL *  root, const char *  label  )

static

Check for EFI block device filesystem label.

Parameters

drive	Drive number
root	Root directory
label	Volume label

Return values

rc	Return status code

Definition at line 594 of file efi_block.c.

                                                 {
        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;
}

References asprintf(), DBGC, drive, EEFI, efi_file_system_info_id, ENOENT, ENOMEM, free, info, malloc(), NULL, rc, root, size, strcasecmp(), and strerror().

Referenced by efi_block_match().

efi_block_match()

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  )

static

Check EFI block device filesystem match.

Parameters

drive	Drive number
handle	Filesystem handle
path	Block device path
config	Boot configuration parameters
fspath	Filesystem device path to fill in

Return values

rc	Return status code

Definition at line 658 of file efi_block.c.

                                                                 {
        EFI_FILE *root;
        union uuid guid;
        int rc;

        /* Identify device path */
        if ( ( rc = efi_open ( handle, &efi_device_path_protocol_guid,
                               fspath ) ) != 0 ) {
                DBGC ( drive, "EFIBLK %#02x could not open %s device path: "
                       "%s\n", drive, efi_handle_name ( handle ),
                       strerror ( rc ) );
                goto err_open;
        }

        /* Check if filesystem is a child of this block device */
        if ( memcmp ( *fspath, 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 ( *fspath ) );

        /* Check if filesystem matches GUID, if applicable */
        if ( config->uuid ) {
                if ( ( rc = efi_path_guid ( *fspath, &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:
 err_open:
        return rc;
}

References DBGC, DBGC2, drive, efi_block_filename(), efi_block_label(), efi_block_root(), efi_device_path_protocol_guid, efi_devpath_text(), efi_handle_name(), efi_open, efi_path_guid(), efi_path_len(), ENOENT, ENOTTY, san_boot_config::extra, san_boot_config::filename, guid, handle, san_boot_config::label, memcmp(), rc, root, strerror(), san_boot_config::uuid, and uuid_ntoa().

Referenced by efi_block_scan().

efi_block_scan()

static int efi_block_scan ( unsigned int  drive, EFI_HANDLE  handle, struct san_boot_config *  config, EFI_DEVICE_PATH_PROTOCOL **  fspath  )

static

Scan EFI block device for a matching filesystem.

Parameters

drive	Drive number
handle	Block device handle
config	Boot configuration parameters
fspath	Filesystem device path to fill in

Return values

rc	Return status code

Definition at line 749 of file efi_block.c.

                                                                {
        EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
        EFI_DEVICE_PATH_PROTOCOL *path;
        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 ( ( rc = efi_open ( handle, &efi_device_path_protocol_guid,
                               &path ) ) != 0 ) {
                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], path,
                                              config, fspath ) ) != 0 )
                        continue;

                break;
        }

        bs->FreePool ( handles );
 err_locate:
 err_open:
        return rc;
}

References EFI_SYSTEM_TABLE::BootServices, ByProtocol, count, DBGC, drive, EEFI, efi_block_connect(), efi_block_match(), efi_device_path_protocol_guid, efi_open, efi_simple_file_system_protocol_guid, efi_systab, ENOENT, EFI_BOOT_SERVICES::FreePool, handle, EFI_BOOT_SERVICES::LocateHandleBuffer, NULL, rc, and strerror().

Referenced by efi_block_boot().

efi_block_exec()

static int efi_block_exec ( unsigned int  drive, EFI_DEVICE_PATH_PROTOCOL *  fspath, const char *  filename  )

static

Boot from EFI block device filesystem boot image.

Parameters

drive	Drive number
fspath	Filesystem device path
filename	Filename (or NULL to use default)

Return values

rc	Return status code

Definition at line 807 of file efi_block.c.

                                                   {
        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;
                }
        }

        /* Wrap calls made by the loaded image (for debugging) */
        efi_wrap_image ( image );

        /* 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 ) );

        /* Remove wrapper */
        efi_unwrap();

 err_load_security_violation:
        bs->UnloadImage ( image );
 err_load:
        free ( path );
 err_alloc:
        return rc;
}

References EFI_SYSTEM_TABLE::BootServices, DBGC, drive, EEFI, efi_block_boot_filename, efi_devpath_text(), efi_image_handle, efi_path_end(), efi_path_terminate(), EFI_SECURITY_VIOLATION, efi_sprintf, efi_systab, efi_unwrap(), efi_wrap_image(), end, ENOMEM, FALSE, free, FILEPATH_DEVICE_PATH::Header, EFI_DEVICE_PATH_PROTOCOL::Length, EFI_BOOT_SERVICES::LoadImage, MEDIA_DEVICE_PATH, MEDIA_FILEPATH_DP, memcpy(), NULL, FILEPATH_DEVICE_PATH::PathName, rc, SIZE_OF_FILEPATH_DEVICE_PATH, EFI_BOOT_SERVICES::StartImage, strerror(), strlen(), EFI_DEVICE_PATH_PROTOCOL::SubType, EFI_DEVICE_PATH_PROTOCOL::Type, EFI_BOOT_SERVICES::UnloadImage, and zalloc().

Referenced by efi_block_boot().

efi_block_local()

static int efi_block_local ( EFI_HANDLE  handle )

static

Check that EFI block device is eligible for a local virtual drive number.

Parameters

handle

Block device handle

Return values

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.

Definition at line 896 of file efi_block.c.

                                                 {
        struct san_device *sandev;
        struct efi_block_data *block;
        EFI_BLOCK_IO_PROTOCOL *blockio;
        int rc;

        /* Check if handle belongs to a SAN device */
        for_each_sandev ( sandev ) {
                block = sandev->priv;
                if ( handle == block->handle )
                        return -ENOTTY;
        }

        /* Open block I/O protocol */
        if ( ( rc = efi_open ( handle, &efi_block_io_protocol_guid,
                               &blockio ) ) != 0 ) {
                DBGC ( handle, "EFIBLK %s could not open block I/O: %s\n",
                       efi_handle_name ( handle ), strerror ( rc ) );
                return rc;
        }

        /* Do not assign drive numbers for partitions */
        if ( blockio->Media->LogicalPartition ) {
                DBGC2 ( handle, "EFLBLK %s is a partition\n",
                        efi_handle_name ( handle ) );
                return -ENOTTY;
        }

        return 0;
}

References block, DBGC, DBGC2, efi_block_io_protocol_guid, efi_handle_name(), efi_open, ENOTTY, for_each_sandev, handle, EFI_BLOCK_IO_MEDIA::LogicalPartition, _EFI_BLOCK_IO_PROTOCOL::Media, san_device::priv, rc, efi_block_data::sandev, and strerror().

Referenced by efi_block_boot().

efi_block_boot()

static int efi_block_boot ( unsigned int  drive, struct san_boot_config *  config  )

static

Boot from EFI block device.

Parameters

drive	Drive number
config	Boot configuration parameters

Return values

rc	Return status code

Definition at line 934 of file efi_block.c.

                                                             {
        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;

        /* Ensure that any local drives are connected */
        efi_driver_reconnect_all();

        /* 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 ) {
                rc = -EEFI ( efirc );
                DBGC ( drive, "EFIBLK %#02x cannot locate block I/O: %s\n",
                       drive, strerror ( rc ) );
                goto err_locate_block_io;
        }

        /* Try booting from the first matching block device, if any */
        rc = -ENOENT;
        for ( vdrive = 0, index = 0 ; ; vdrive++ ) {

                /* Identify next drive number and block I/O handle */
                if ( ( sandev = sandev_next ( vdrive ) ) &&
                     ( ( sandev->drive == vdrive ) ||
                       ( sandev->drive <= SAN_DEFAULT_DRIVE ) ||
                       ( index >= count ) ) ) {

                        /* There is a SAN drive that either:
                         *
                         * a) has the current virtual drive number, or
                         * b) has a drive number below SAN_DEFAULT_DRIVE, or
                         * c) has a drive number higher than any local drive
                         *
                         * Use this SAN drive, since the explicit SAN
                         * drive numbering takes precedence over the
                         * implicit local drive numbering.
                         */
                        block = sandev->priv;
                        handle = block->handle;

                        /* Use SAN drive's explicit drive number */
                        vdrive = sandev->drive;
                        DBGC ( vdrive, "EFIBLK %#02x is SAN drive %s\n",
                               vdrive, efi_handle_name ( handle ) );

                } else if ( index < count ) {

                        /* There is no SAN drive meeting any of the
                         * above criteria.  Try the next block I/O
                         * handle.
                         */
                        handle = handles[index++];

                        /* Check if this handle is eligible to be
                         * given a local virtual drive number.
                         *
                         * Do not record this as the overall error
                         * status, since it is not an interesting
                         * error.
                         */
                        if ( efi_block_local ( handle ) != 0 ) {
                                /* Do not consume virtual drive number */
                                vdrive--;
                                continue;
                        }

                        /* Use the current virtual drive number, with
                         * a minimum of SAN_DEFAULT_DRIVE to match
                         * typical BIOS drive numbering.
                         */
                        if ( vdrive < SAN_DEFAULT_DRIVE )
                                vdrive = SAN_DEFAULT_DRIVE;
                        DBGC ( vdrive, "EFIBLK %#02x is local drive %s\n",
                               vdrive, efi_handle_name ( handle ) );

                } else {

                        /* No more SAN or local drives */
                        break;
                }

                /* Skip non-matching drives */
                if ( drive && ( drive != vdrive ) )
                        continue;
                DBGC ( vdrive, "EFIBLK %#02x attempting to boot\n", vdrive );

                /* Scan for a matching filesystem within this drive */
                if ( ( rc = efi_block_scan ( vdrive, handle, config,
                                             &fspath ) ) != 0 ) {
                        continue;
                }

                /* Attempt to boot from the matched filesystem */
                rc = efi_block_exec ( vdrive, fspath, config->filename );
                break;
        }

        bs->FreePool ( handles );
 err_locate_block_io:
        efi_snp_claim();
        return rc;
}

References block, EFI_SYSTEM_TABLE::BootServices, ByProtocol, count, DBGC, drive, san_device::drive, EEFI, efi_block_exec(), efi_block_io_protocol_guid, efi_block_local(), efi_block_scan(), efi_driver_reconnect_all(), efi_handle_name(), efi_snp_claim(), efi_snp_release(), efi_systab, ENOENT, san_boot_config::filename, EFI_BOOT_SERVICES::FreePool, handle, index, EFI_BOOT_SERVICES::LocateHandleBuffer, NULL, san_device::priv, rc, SAN_DEFAULT_DRIVE, efi_block_data::sandev, sandev_next(), and strerror().

PROVIDE_SANBOOT() [1/4]

PROVIDE_SANBOOT	(	efi	,
		san_hook	,
		efi_block_hook
	)

PROVIDE_SANBOOT() [2/4]

PROVIDE_SANBOOT	(	efi	,
		san_unhook	,
		efi_block_unhook
	)

PROVIDE_SANBOOT() [3/4]

PROVIDE_SANBOOT	(	efi	,
		san_describe	,
		efi_block_describe
	)

PROVIDE_SANBOOT() [4/4]

PROVIDE_SANBOOT	(	efi	,
		san_boot	,
		efi_block_boot
	)

Variable Documentation

acpi

EFI_ACPI_TABLE_PROTOCOL* acpi

static

ACPI table protocol protocol.

Definition at line 67 of file efi_block.c.

Referenced by acpi_extract(), acpi_fix_checksum(), acpi_poweroff(), acpi_settings_fetch(), acpi_timer_probe(), dummy_install(), ecam_find(), efi_block_describe(), efi_block_install(), efipci_discover_one(), ibft_install(), int13_install(), nii_pci_open(), spcr_console(), and typeof().

efi_block_boot_filename

wchar_t efi_block_boot_filename[] = EFI_REMOVABLE_MEDIA_FILE_NAME

static

Boot filename.

Definition at line 71 of file efi_block.c.

Referenced by efi_block_exec(), and efi_block_filename().