/**************************************************************************** * fs/romfs/fs_romfs.h * * Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * References: Linux/Documentation/filesystems/romfs.txt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __FS_ROMFS_FS_ROMFS_H #define __FS_ROMFS_FS_ROMFS_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include "../fs.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_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 fat32 filesystem. */ struct romfs_file_s; struct romfs_mountpt_s { struct inode *rm_blkdriver; /* The block driver inode that hosts the FAT32 fs */ struct romfs_file_s *rm_head; /* A list to all files opened on this mountpoint */ bool rm_mounted; /* true: The file system is ready */ uint16_t rm_hwsectorsize; /* HW: Sector size reported by block driver*/ sem_t rm_sem; /* Used to assume thread-safe access */ uint32_t rm_rootoffset; /* Saved offset to the first root directory entry */ 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 */ uint8_t *rm_xipbase; /* Base address of directly accessible media */ 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 { struct romfs_file_s *rf_next; /* Retained in a singly linked list */ uint32_t rf_startoffset; /* Offset to the start of the file data */ uint32_t rf_size; /* Size of the file in bytes */ uint32_t rf_cachesector; /* Current sector in the rf_buffer */ uint8_t *rf_buffer; /* File sector buffer, allocated if rm_xipbase==0 */ }; /* This structure is used internally for describing the result of * walking a path */ struct romfs_dirinfo_s { /* These values describe the directory containing the terminal * path component (of the terminal component itself if it is * a directory. */ struct fs_romfsdir_s rd_dir; /* Describes directory. */ /* Values from the ROMFS file entry */ uint32_t rd_next; /* Offset of the next file header+flags */ uint32_t rd_size; /* Size (if file) */ }; /**************************************************************************** * Global Variables ****************************************************************************/ /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif EXTERN void romfs_semtake(struct romfs_mountpt_s *rm); EXTERN void romfs_semgive(struct romfs_mountpt_s *rm); EXTERN int romfs_hwread(struct romfs_mountpt_s *rm, uint8_t *buffer, uint32_t sector, unsigned int nsectors); EXTERN int romfs_filecacheread(struct romfs_mountpt_s *rm, struct romfs_file_s *rf, uint32_t sector); EXTERN int romfs_hwconfigure(struct romfs_mountpt_s *rm); EXTERN int romfs_fsconfigure(struct romfs_mountpt_s *rm); EXTERN int romfs_fileconfigure(struct romfs_mountpt_s *rm, struct romfs_file_s *rf); EXTERN int romfs_checkmount(struct romfs_mountpt_s *rm); EXTERN int romfs_finddirentry(struct romfs_mountpt_s *rm, struct romfs_dirinfo_s *dirinfo, const char *path); EXTERN int romfs_parsedirentry(struct romfs_mountpt_s *rm, uint32_t offset, uint32_t *poffset, uint32_t *pnext, uint32_t *pinfo, uint32_t *psize); EXTERN int romfs_parsefilename(struct romfs_mountpt_s *rm, uint32_t offset, char *pname); EXTERN int romfs_datastart(struct romfs_mountpt_s *rm, uint32_t offset, uint32_t *start); #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __FS_ROMFS_FS_ROMFS_H */