1 /* 2 * Copyright (c) 2014, STMicroelectronics International N.V. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef TEE_FS_H 29 #define TEE_FS_H 30 31 #include <stddef.h> 32 #include <stdint.h> 33 34 #define TEE_FS_NAME_MAX 350 35 36 /* 37 * We split a TEE file into multiple blocks and store them 38 * on REE filesystem. A TEE file is represented by a REE file 39 * called meta and a number of REE files called blocks. Meta 40 * file is used for storing file information, e.g. file size 41 * and backup version of each block. 42 * 43 * REE files naming rule is as follows: 44 * 45 * <tee_file_name>/meta.<backup_version> 46 * <tee_file_name>/block0.<backup_version> 47 * ... 48 * <tee_file_name>/block15.<backup_version> 49 * 50 * Backup_version is used to support atomic update operation. 51 * Original file will not be updated, instead we create a new 52 * version of the same file and update the new file instead. 53 * 54 * The backup_version of each block file is stored in meta 55 * file (see @backup_version_table in tee_fs_private.h), the 56 * meta file itself also has backup_version, the update is 57 * successful after new version of meta has been written. 58 */ 59 #define REE_FS_NAME_MAX (TEE_FS_NAME_MAX + 20) 60 61 typedef int tee_fs_off_t; 62 typedef uint32_t tee_fs_mode_t; 63 typedef struct tee_fs_dir tee_fs_dir; 64 65 struct tee_fs_dirent { 66 char *d_name; 67 }; 68 69 /* 70 * tee_fs implemets a POSIX like secure file system 71 */ 72 struct tee_file_operations { 73 int (*open)(const char *file, int flags, ...); 74 int (*close)(int fd); 75 int (*read)(int fd, void *buf, size_t len); 76 int (*write)(int fd, const void *buf, size_t len); 77 tee_fs_off_t (*lseek)(int fd, tee_fs_off_t offset, int whence); 78 int (*rename)(const char *old, const char *new); 79 int (*unlink)(const char *file); 80 int (*ftruncate)(int fd, tee_fs_off_t length); 81 int (*mkdir)(const char *path, tee_fs_mode_t mode); 82 tee_fs_dir *(*opendir)(const char *name); 83 int (*closedir)(tee_fs_dir *d); 84 struct tee_fs_dirent *(*readdir)(tee_fs_dir *d); 85 int (*rmdir)(const char *pathname); 86 int (*access)(const char *name, int mode); 87 }; 88 89 struct tee_fs_rpc { 90 int op; 91 int flags; 92 int arg; 93 int fd; 94 uint32_t len; 95 int res; 96 }; 97 98 extern struct tee_file_operations tee_file_ops; 99 100 int tee_fs_send_cmd(struct tee_fs_rpc *bf_cmd, void *data, uint32_t len, 101 uint32_t mode); 102 103 #endif 104