/**************************************************************************** * fs/romfs/fs_romfs.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __FS_ROMFS_FS_ROMFS_H #define __FS_ROMFS_FS_ROMFS_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include "inode/inode.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Volume header (multi-byte values are big-endian) */ #define ROMFS_VHDR_ROM1FS 0 /* 0-7: "-rom1fs-" */ #define ROMFS_VHDR_SIZE 8 /* 8-11: Number of accessible bytes in this fs. */ #define ROMFS_VHDR_CHKSUM 12 /* 12-15: Checksum of the first 512 bytes. */ #define ROMFS_VHDR_VOLNAME 16 /* 16-..: Zero terminated volume name, padded to * 16 byte boundary. */ #define ROMFS_VHDR_MAGIC "-rom1fs-" /* File header offset (multi-byte values are big-endian) */ #define ROMFS_FHDR_NEXT 0 /* 0-3: Offset of the next file header * (zero if no more files) */ #define ROMFS_FHDR_INFO 4 /* 4-7: Info for directories/hard links/ * devices */ #define ROMFS_FHDR_SIZE 8 /* 8-11: Size of this file in bytes */ #define ROMFS_FHDR_CHKSUM 12 /* 12-15: Checksum covering the meta data, * including the file name, and * padding. */ #define ROMFS_FHDR_NAME 16 /* 16-..: Zero terminated volume name, padded * to 16 byte boundary. */ /* Bits 0-3 of the rf_next offset provide mode information. These are the * values specified in */ #define RFNEXT_MODEMASK 7 /* Bits 0-2: Mode; bit 3: Executable */ #define RFNEXT_ALLMODEMASK 15 /* Bits 0-3: All mode bits */ #define RFNEXT_OFFSETMASK (~15) /* Bits n-3: Offset to next entry */ #define RFNEXT_HARDLINK 0 /* rf_info = Link destination file header */ #define RFNEXT_DIRECTORY 1 /* rf_info = First file's header */ #define RFNEXT_FILE 2 /* rf_info = Unused, must be zero */ #define RFNEXT_SOFTLINK 3 /* rf_info = Unused, must be zero */ #define RFNEXT_BLOCKDEV 4 /* rf_info = 16/16 bits major/minor number */ #define RFNEXT_CHARDEV 5 /* rf_info = 16/16 bits major/minor number */ #define RFNEXT_SOCKET 6 /* rf_info = Unused, must be zero */ #define RFNEXT_FIFO 7 /* rf_info = Unused, must be zero */ #define RFNEXT_EXEC 8 /* Modifier of RFNEXT_DIRECTORY and RFNEXT_FILE */ #define IS_MODE(rfn,mode) ((((uint32_t)(rfn))&RFNEXT_MODEMASK)==(mode)) #define IS_HARDLINK(rfn) IS_MODE(rfn,RFNEXT_HARDLINK) #define IS_DIRECTORY(rfn) IS_MODE(rfn,RFNEXT_DIRECTORY) #define IS_FILE(rfn) IS_MODE(rfn,RFNEXT_FILE) #define IS_SOFTLINK(rfn) IS_MODE(rfn,RFNEXT_SOFTLINK) #define IS_BLOCKDEV(rfn) IS_MODE(rfn,RFNEXT_BLOCKDEV) #define IS_CHARDEV(rfn) IS_MODE(rfn,RFNEXT_CHARDEV) #define IS_SOCKET(rfn) IS_MODE(rfn,RFNEXT_SOCKET) #define IS_FIFO(rfn) IS_MODE(rfn,RFNEXT_FIFO) #define IS_EXECUTABLE(rfn) (((rfn) & RFNEXT_EXEC) != 0) /* RFNEXT_SOFTLINK, RFNEXT_BLOCKDEV, RFNEXT_CHARDEV, RFNEXT_SOCKET, and * RFNEXT_FIFO are not presently supported in NuttX. */ /* Alignment macros */ #define ROMFS_ALIGNMENT 16 #define ROMFS_MAXPADDING (ROMFS_ALIGNMENT-1) #define ROMFS_ALIGNMASK (~ROMFS_MAXPADDING) #define ROMFS_ALIGNUP(addr) ((((uint32_t)(addr))+ROMFS_MAXPADDING)&ROMFS_ALIGNMASK) #define ROMFS_ALIGNDOWN(addr) (((uint32_t)(addr))&ROMFS_ALIGNMASK) /* Offset and sector conversions */ #define SEC_NDXMASK(r) ((r)->rm_hwsectorsize - 1) #define SEC_NSECTORS(r,o) ((o) / (r)->rm_hwsectorsize) #define SEC_ALIGN(r,o) ((o) & ~SEC_NDXMASK(r)) /* Maximum numbr of links that will be followed before we decide that there * is a problem. */ #define ROMF_MAX_LINKS 64 /**************************************************************************** * Public Types ****************************************************************************/ /* This structure represents the overall mountpoint state. An instance of * this structure is retained as inode private data on each mountpoint that * is mounted with a romfs filesystem. */ struct romfs_file_s; struct romfs_mountpt_s { FAR struct inode *rm_blkdriver; /* The block driver inode that hosts the romfs */ #ifdef CONFIG_FS_ROMFS_CACHE_NODE FAR struct romfs_nodeinfo_s *rm_root; /* The node for root node */ #else uint32_t rm_rootoffset; /* Saved offset to the first root directory entry */ #endif bool rm_mounted; /* true: The file system is ready */ uint16_t rm_hwsectorsize; /* HW: Sector size reported by block driver */ rmutex_t rm_lock; /* Used to assume thread-safe access */ uint32_t rm_refs; /* The references for all files opened on this mountpoint */ uint32_t rm_hwnsectors; /* HW: The number of sectors reported by the hardware */ uint32_t rm_volsize; /* Size of the ROMFS volume */ uint32_t rm_cachesector; /* Current sector in the rm_buffer */ FAR uint8_t *rm_xipbase; /* Base address of directly accessible media */ FAR uint8_t *rm_buffer; /* Device sector buffer, allocated if rm_xipbase==0 */ }; /* This structure represents on open file under the mountpoint. An instance * of this structure is retained as struct file specific information on each * opened file. */ struct romfs_file_s { uint32_t rf_startoffset; /* Offset to the start of the file data */ uint32_t rf_endsector; /* Last sector of the file data */ uint32_t rf_size; /* Size of the file in bytes */ uint32_t rf_cachesector; /* First sector in the rf_buffer */ uint32_t rf_ncachesector; /* Number of sectors in the rf_buffer */ FAR uint8_t *rf_buffer; /* File sector buffer, allocated if rm_xipbase==0 */ uint8_t rf_type; /* File type (for fstat()) */ char rf_path[1]; /* Path of open file */ }; struct romfs_nodeinfo_s { uint32_t rn_offset; /* Offset of real file header */ uint32_t rn_next; /* Offset of the next file header+flags */ uint32_t rn_size; /* Size (if file) */ #ifdef CONFIG_FS_ROMFS_CACHE_NODE FAR struct romfs_nodeinfo_s **rn_child; /* The node array for link to lower level */ uint16_t rn_count; /* The count of node in rn_child level */ uint8_t rn_namesize; /* The length of name of the entry */ char rn_name[1]; /* The name to the entry */ #endif }; /**************************************************************************** * Public Data ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ int romfs_hwread(FAR struct romfs_mountpt_s *rm, FAR uint8_t *buffer, uint32_t sector, unsigned int nsectors); int romfs_filecacheread(FAR struct romfs_mountpt_s *rm, FAR struct romfs_file_s *rf, uint32_t sector); int romfs_hwconfigure(FAR struct romfs_mountpt_s *rm); int romfs_fsconfigure(FAR struct romfs_mountpt_s *rm); int romfs_fileconfigure(FAR struct romfs_mountpt_s *rm, FAR struct romfs_file_s *rf); int romfs_checkmount(FAR struct romfs_mountpt_s *rm); int romfs_finddirentry(FAR struct romfs_mountpt_s *rm, FAR struct romfs_nodeinfo_s *nodeinfo, FAR const char *path); int romfs_parsedirentry(FAR struct romfs_mountpt_s *rm, uint32_t offset, FAR uint32_t *poffset, FAR uint32_t *pnext, FAR uint32_t *pinfo, FAR uint32_t *psize); int romfs_parsefilename(FAR struct romfs_mountpt_s *rm, uint32_t offset, FAR char *pname); int romfs_datastart(FAR struct romfs_mountpt_s *rm, FAR struct romfs_nodeinfo_s *nodeinfo, FAR uint32_t *start); #ifdef CONFIG_FS_ROMFS_CACHE_NODE void romfs_freenode(FAR struct romfs_nodeinfo_s *node); #endif #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __FS_ROMFS_FS_ROMFS_H */