diff options
Diffstat (limited to 'src/interface')
| -rw-r--r-- | src/interface/efi/efi_download.c | 34 | ||||
| -rw-r--r-- | src/interface/efi/efi_file.c | 594 |
2 files changed, 607 insertions, 21 deletions
diff --git a/src/interface/efi/efi_download.c b/src/interface/efi/efi_download.c index 250946e28..7b19ad3a2 100644 --- a/src/interface/efi/efi_download.c +++ b/src/interface/efi/efi_download.c @@ -25,7 +25,7 @@ FILE_LICENCE ( GPL2_OR_LATER ); #include <ipxe/iobuf.h> #include <ipxe/xfer.h> #include <ipxe/efi/efi.h> -#include <ipxe/efi/ipxe_download.h> +#include <ipxe/efi/efi_download.h> /** iPXE download protocol GUID */ static EFI_GUID ipxe_download_protocol_guid @@ -187,47 +187,39 @@ static IPXE_DOWNLOAD_PROTOCOL ipxe_download_protocol_interface = { }; /** - * Create a new device handle with a iPXE download protocol attached to it. + * Install iPXE download protocol * - * @v device_handle Newly created device handle (output) + * @v handle EFI handle * @ret rc Return status code */ -int efi_download_install ( EFI_HANDLE *device_handle ) { +int efi_download_install ( EFI_HANDLE *handle ) { EFI_BOOT_SERVICES *bs = efi_systab->BootServices; EFI_STATUS efirc; - EFI_HANDLE handle = NULL; - if (efi_loaded_image->DeviceHandle) { /* TODO: ensure handle is the NIC (maybe efi_image has a better way to indicate the handle doing SNP?) */ - handle = efi_loaded_image->DeviceHandle; - } - DBG ( "Installing ipxe protocol interface (%p)... ", - &ipxe_download_protocol_interface ); efirc = bs->InstallMultipleProtocolInterfaces ( - &handle, + handle, &ipxe_download_protocol_guid, &ipxe_download_protocol_interface, NULL ); if ( efirc ) { - DBG ( "failed (%s)\n", efi_strerror ( efirc ) ); + DBG ( "Could not install download protocol: %s\n", + efi_strerror ( efirc ) ); return EFIRC_TO_RC ( efirc ); } - DBG ( "success (%p)\n", handle ); - *device_handle = handle; return 0; } /** - * Remove the iPXE download protocol from the given handle, and if nothing - * else is attached, destroy the handle. + * Uninstall iPXE download protocol * - * @v device_handle EFI device handle to remove from + * @v handle EFI handle */ -void efi_download_uninstall ( EFI_HANDLE device_handle ) { +void efi_download_uninstall ( EFI_HANDLE handle ) { EFI_BOOT_SERVICES *bs = efi_systab->BootServices; bs->UninstallMultipleProtocolInterfaces ( - device_handle, - ipxe_download_protocol_guid, - ipxe_download_protocol_interface ); + handle, + &ipxe_download_protocol_guid, + &ipxe_download_protocol_interface, NULL ); } diff --git a/src/interface/efi/efi_file.c b/src/interface/efi/efi_file.c new file mode 100644 index 000000000..ffe25fd66 --- /dev/null +++ b/src/interface/efi/efi_file.c @@ -0,0 +1,594 @@ +/* + * Copyright (C) 2013 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. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +/** + * @file + * + * EFI file protocols + * + */ + +#include <stddef.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <wchar.h> +#include <ipxe/image.h> +#include <ipxe/efi/efi.h> +#include <ipxe/efi/Protocol/SimpleFileSystem.h> +#include <ipxe/efi/Protocol/BlockIo.h> +#include <ipxe/efi/Guid/FileInfo.h> +#include <ipxe/efi/Guid/FileSystemInfo.h> +#include <ipxe/efi/efi_strings.h> +#include <ipxe/efi/efi_file.h> + +/** EFI simple file system protocol GUID */ +static EFI_GUID efi_simple_file_system_protocol_guid + = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID; + +/** EFI file information GUID */ +static EFI_GUID efi_file_info_id = EFI_FILE_INFO_ID; + +/** EFI file system information GUID */ +static EFI_GUID efi_file_system_info_id = EFI_FILE_SYSTEM_INFO_ID; + +/** EFI block I/O protocol GUID */ +static EFI_GUID efi_block_io_protocol_guid + = EFI_BLOCK_IO_PROTOCOL_GUID; + +/** EFI media ID */ +#define EFI_MEDIA_ID_MAGIC 0x69505845 + +/** An image exposed as an EFI file */ +struct efi_file { + /** EFI file protocol */ + EFI_FILE_PROTOCOL file; + /** Image */ + struct image *image; + /** Current file position */ + size_t pos; +}; + +static struct efi_file efi_file_root; + +/** + * Get EFI file name (for debugging) + * + * @v file EFI file + * @ret name Name + */ +static const char * efi_file_name ( struct efi_file *file ) { + + return ( file->image ? file->image->name : "<root>" ); +} + +/** + * Open file + * + * @v this EFI file + * @ret new New EFI file + * @v wname Filename + * @v mode File mode + * @v attributes File attributes (for newly-created files) + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI +efi_file_open ( EFI_FILE_PROTOCOL *this, EFI_FILE_PROTOCOL **new, + CHAR16 *wname, UINT64 mode __unused, + UINT64 attributes __unused ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + char name[ wcslen ( wname ) + 1 /* NUL */ ]; + struct efi_file *new_file; + struct image *image; + + /* Initial '\' indicates opening from the root directory */ + while ( *wname == L'\\' ) { + file = &efi_file_root; + wname++; + } + + /* Allow root directory itself to be opened */ + if ( ( wname[0] == L'\0' ) || ( wname[0] == L'.' ) ) { + *new = &efi_file_root.file; + return 0; + } + + /* Fail unless opening from the root */ + if ( file->image ) { + DBGC ( file, "EFIFILE %s is not a directory\n", + efi_file_name ( file ) ); + return EFI_NOT_FOUND; + } + + /* Identify image */ + snprintf ( name, sizeof ( name ), "%ls", wname ); + image = find_image ( name ); + if ( ! image ) { + DBGC ( file, "EFIFILE \"%s\" does not exist\n", name ); + return EFI_NOT_FOUND; + } + + /* Fail unless opening read-only */ + if ( mode != EFI_FILE_MODE_READ ) { + DBGC ( file, "EFIFILE %s cannot be opened in mode %#08llx\n", + image->name, mode ); + return EFI_WRITE_PROTECTED; + } + + /* Allocate and initialise file */ + new_file = zalloc ( sizeof ( *new_file ) ); + memcpy ( &new_file->file, &efi_file_root.file, + sizeof ( new_file->file ) ); + new_file->image = image_get ( image ); + *new = &new_file->file; + DBGC ( new_file, "EFIFILE %s opened\n", efi_file_name ( new_file ) ); + + return 0; +} + +/** + * Close file + * + * @v this EFI file + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_close ( EFI_FILE_PROTOCOL *this ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + /* Do nothing if this is the root */ + if ( ! file->image ) + return 0; + + /* Close file */ + DBGC ( file, "EFIFILE %s closed\n", efi_file_name ( file ) ); + image_put ( file->image ); + free ( file ); + + return 0; +} + +/** + * Close and delete file + * + * @v this EFI file + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_delete ( EFI_FILE_PROTOCOL *this ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + DBGC ( file, "EFIFILE %s cannot be deleted\n", efi_file_name ( file ) ); + + /* Close file */ + efi_file_close ( this ); + + /* Warn of failure to delete */ + return EFI_WARN_DELETE_FAILURE; +} + +/** + * Return variable-length data structure + * + * @v base Base data structure (starting with UINT64) + * @v base_len Length of base data structure + * @v name Name to append to base data structure + * @v len Length of data buffer + * @v data Data buffer + * @ret efirc EFI status code + */ +static EFI_STATUS efi_file_varlen ( UINT64 *base, size_t base_len, + const char *name, UINTN *len, VOID *data ) { + size_t name_len; + + /* Calculate structure length */ + name_len = strlen ( name ); + *base = ( base_len + ( name_len + 1 /* NUL */ ) * sizeof ( wchar_t ) ); + if ( *len < *base ) { + *len = *base; + return EFI_BUFFER_TOO_SMALL; + } + + /* Copy data to buffer */ + *len = *base; + memcpy ( data, base, base_len ); + efi_snprintf ( ( data + base_len ), ( name_len + 1 /* NUL */ ), + "%s", name ); + + return 0; +} + +/** + * Return file information structure + * + * @v image Image, or NULL for the root directory + * @v len Length of data buffer + * @v data Data buffer + * @ret efirc EFI status code + */ +static EFI_STATUS efi_file_info ( struct image *image, UINTN *len, + VOID *data ) { + EFI_FILE_INFO info; + const char *name; + + /* Populate file information */ + memset ( &info, 0, sizeof ( info ) ); + if ( image ) { + info.FileSize = image->len; + info.PhysicalSize = image->len; + info.Attribute = EFI_FILE_READ_ONLY; + name = image->name; + } else { + info.Attribute = ( EFI_FILE_READ_ONLY | EFI_FILE_DIRECTORY ); + name = ""; + } + + return efi_file_varlen ( &info.Size, SIZE_OF_EFI_FILE_INFO, name, + len, data ); +} + +/** + * Read directory entry + * + * @v file EFI file + * @v len Length to read + * @v data Data buffer + * @ret efirc EFI status code + */ +static EFI_STATUS efi_file_read_dir ( struct efi_file *file, UINTN *len, + VOID *data ) { + EFI_STATUS efirc; + struct image *image; + unsigned int index; + + /* Construct directory entry at current position */ + index = file->pos; + for_each_image ( image ) { + if ( index-- == 0 ) { + efirc = efi_file_info ( image, len, data ); + if ( efirc == 0 ) + file->pos++; + return efirc; + } + } + + /* No more entries */ + *len = 0; + return 0; +} + +/** + * Read from file + * + * @v this EFI file + * @v len Length to read + * @v data Data buffer + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_read ( EFI_FILE_PROTOCOL *this, + UINTN *len, VOID *data ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + size_t remaining; + + /* If this is the root directory, then construct a directory entry */ + if ( ! file->image ) + return efi_file_read_dir ( file, len, data ); + + /* Read from the file */ + remaining = ( file->image->len - file->pos ); + if ( *len > remaining ) + *len = remaining; + DBGC ( file, "EFIFILE %s read [%#08zx,%#08zx)\n", + efi_file_name ( file ), file->pos, + ( ( size_t ) ( file->pos + *len ) ) ); + copy_from_user ( data, file->image->data, file->pos, *len ); + file->pos += *len; + return 0; +} + +/** + * Write to file + * + * @v this EFI file + * @v len Length to write + * @v data Data buffer + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_write ( EFI_FILE_PROTOCOL *this, + UINTN *len, VOID *data __unused ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + DBGC ( file, "EFIFILE %s cannot write [%#08zx, %#08zx)\n", + efi_file_name ( file ), file->pos, + ( ( size_t ) ( file->pos + *len ) ) ); + return EFI_WRITE_PROTECTED; +} + +/** + * Set file position + * + * @v this EFI file + * @v position New file position + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_set_position ( EFI_FILE_PROTOCOL *this, + UINT64 position ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + /* If this is the root directory, reset to the start */ + if ( ! file->image ) { + DBGC ( file, "EFIFILE root directory rewound\n" ); + file->pos = 0; + return 0; + } + + /* Check for the magic end-of-file value */ + if ( position == 0xffffffffffffffffULL ) + position = file->image->len; + + /* Fail if we attempt to seek past the end of the file (since + * we do not support writes). + */ + if ( position > file->image->len ) { + DBGC ( file, "EFIFILE %s cannot seek to %#08llx of %#08zx\n", + efi_file_name ( file ), position, file->image->len ); + return EFI_UNSUPPORTED; + } + + /* Set position */ + file->pos = position; + DBGC ( file, "EFIFILE %s position set to %#08zx\n", + efi_file_name ( file ), file->pos ); + + return 0; +} + +/** + * Get file position + * + * @v this EFI file + * @ret position New file position + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_get_position ( EFI_FILE_PROTOCOL *this, + UINT64 *position ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + *position = file->pos; + return 0; +} + +/** + * Get file information + * + * @v this EFI file + * @v type Type of information + * @v len Buffer size + * @v data Buffer + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_get_info ( EFI_FILE_PROTOCOL *this, + EFI_GUID *type, + UINTN *len, VOID *data ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + EFI_FILE_SYSTEM_INFO fsinfo; + struct image *image; + + /* Determine information to return */ + if ( memcmp ( type, &efi_file_info_id, sizeof ( *type ) ) == 0 ) { + + /* Get file information */ + DBGC ( file, "EFIFILE %s get file information\n", + efi_file_name ( file ) ); + return efi_file_info ( file->image, len, data ); + + } else if ( memcmp ( type, &efi_file_system_info_id, + sizeof ( *type ) ) == 0 ) { + + /* Get file system information */ + DBGC ( file, "EFIFILE %s get file system information\n", + efi_file_name ( file ) ); + memset ( &fsinfo, 0, sizeof ( fsinfo ) ); + fsinfo.ReadOnly = 1; + for_each_image ( image ) + fsinfo.VolumeSize += image->len; + return efi_file_varlen ( &fsinfo.Size, + SIZE_OF_EFI_FILE_SYSTEM_INFO, "iPXE", + len, data ); + } else { + + DBGC ( file, "EFIFILE %s cannot get information of type %s\n", + efi_file_name ( file ), + uuid_ntoa ( ( union uuid * ) type ) ); + return EFI_UNSUPPORTED; + } +} + +/** + * Set file information + * + * @v this EFI file + * @v type Type of information + * @v len Buffer size + * @v data Buffer + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI +efi_file_set_info ( EFI_FILE_PROTOCOL *this, EFI_GUID *type, + UINTN len __unused, VOID *data __unused ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + DBGC ( file, "EFIFILE %s cannot set information of type %s\n", + efi_file_name ( file ), uuid_ntoa ( ( union uuid * ) type ) ); + return EFI_WRITE_PROTECTED; +} + +/** + * Flush file modified data + * + * @v this EFI file + * @v type Type of information + * @v len Buffer size + * @v data Buffer + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI efi_file_flush ( EFI_FILE_PROTOCOL *this ) { + struct efi_file *file = container_of ( this, struct efi_file, file ); + + DBGC ( file, "EFIFILE %s flushed\n", efi_file_name ( file ) ); + return 0; +} + +/** Root directory */ +static struct efi_file efi_file_root = { + .file = { + .Revision = EFI_FILE_PROTOCOL_REVISION, + .Open = efi_file_open, + .Close = efi_file_close, + .Delete = efi_file_delete, + .Read = efi_file_read, + .Write = efi_file_write, + .GetPosition = efi_file_get_position, + .SetPosition = efi_file_set_position, + .GetInfo = efi_file_get_info, + .SetInfo = efi_file_set_info, + .Flush = efi_file_flush, + }, + .image = NULL, +}; + +/** + * Open root directory + * + * @v filesystem EFI simple file system + * @ret file EFI file handle + * @ret efirc EFI status code + */ +static EFI_STATUS EFIAPI +efi_file_open_volume ( EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *filesystem __unused, + EFI_FILE_PROTOCOL **file ) { + + *file = &efi_file_root.file; + return 0; +} + +/** EFI simple file system protocol */ +static EFI_SIMPLE_FILE_SYSTEM_PROTOCOL efi_simple_file_system_protocol = { + .Revision = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION, + .OpenVolume = efi_file_open_volume, +}; + +/** Dummy block I/O reset */ +static EFI_STATUS EFIAPI +efi_block_io_reset ( EFI_BLOCK_IO_PROTOCOL *this __unused, + BOOLEAN extended __unused ) { + return 0; +} + +/** Dummy block I/O read */ +static EFI_STATUS EFIAPI +efi_block_io_read_blocks ( EFI_BLOCK_IO_PROTOCOL *this __unused, + UINT32 MediaId __unused, EFI_LBA lba __unused, + UINTN len __unused, VOID *data __unused ) { + return EFI_DEVICE_ERROR; +} + +/** Dummy block I/O write */ +static EFI_STATUS EFIAPI +efi_block_io_write_blocks ( EFI_BLOCK_IO_PROTOCOL *this __unused, + UINT32 MediaId __unused, EFI_LBA lba __unused, + UINTN len __unused, VOID *data __unused ) { + return EFI_DEVICE_ERROR; +} + +/** Dummy block I/O flush */ +static EFI_STATUS EFIAPI +efi_block_io_flush_blocks ( EFI_BLOCK_IO_PROTOCOL *this __unused ) { + return 0; +} + +/** Dummy block I/O media */ +static EFI_BLOCK_IO_MEDIA efi_block_io_media = { + .MediaId = EFI_MEDIA_ID_MAGIC, + .MediaPresent = 1, + .ReadOnly = 1, + .BlockSize = 1, +}; + +/** Dummy EFI block I/O protocol */ +static EFI_BLOCK_IO_PROTOCOL efi_block_io_protocol = { + .Revision = EFI_BLOCK_IO_PROTOCOL_REVISION, + .Media = &efi_block_io_media, + .Reset = efi_block_io_reset, + .ReadBlocks = efi_block_io_read_blocks, + .WriteBlocks = efi_block_io_write_blocks, + .FlushBlocks = efi_block_io_flush_blocks, +}; + +/** + * Install EFI simple file system protocol + * + * @v handle EFI handle + * @ret rc Return status code + */ +int efi_file_install ( EFI_HANDLE *handle ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + EFI_STATUS efirc; + + /* Install the simple file system protocol and the block I/O + * protocol. We don't have a block device, but large parts of + * the EDK2 codebase make the assumption that file systems are + * normally attached to block devices, and so we create a + * dummy block device on the same handle just to keep things + * looking normal. + */ + if ( ( efirc = bs->InstallMultipleProtocolInterfaces ( + handle, + &efi_block_io_protocol_guid, + &efi_block_io_protocol, + &efi_simple_file_system_protocol_guid, + &efi_simple_file_system_protocol, NULL ) ) != 0 ) { + DBGC ( handle, "Could not install simple file system protocol: " + "%s\n", efi_strerror ( efirc ) ); + return EFIRC_TO_RC ( efirc ); + } + + return 0; +} + +/** + * Uninstall EFI simple file system protocol + * + * @v handle EFI handle + */ +void efi_file_uninstall ( EFI_HANDLE handle ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + + /* We must install the file system protocol first, since + * otherwise the EDK2 code will attempt to helpfully uninstall + * it when the block I/O protocol is uninstalled, leading to a + * system lock-up. + */ + bs->UninstallMultipleProtocolInterfaces ( + handle, + &efi_simple_file_system_protocol_guid, + &efi_simple_file_system_protocol, + &efi_block_io_protocol_guid, + &efi_block_io_protocol, NULL ); +} |