144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
#ifndef _ENVFS_H
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#define _ENVFS_H
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#ifdef __BAREBOX__
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#include <asm/byteorder.h>
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#include <linux/stringify.h>
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#endif
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#define ENVFS_MAJOR 1
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#define ENVFS_MINOR 0
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#define ENVFS_MAGIC 0x798fba79 /* some random number */
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#define ENVFS_INODE_MAGIC 0x67a8c78d
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#define ENVFS_INODE_END_MAGIC 0x68a8c78d
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#define ENVFS_END_MAGIC 0x6a87d6cd
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#define ENVFS_SIGNATURE "barebox envfs"
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struct envfs_inode {
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uint32_t magic; /* ENVFS_INODE_MAGIC */
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uint32_t size; /* data size in bytes */
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uint32_t headerlen; /* The length of the filename _including_ a trailing 0 */
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char data[0]; /* The filename (zero terminated) + padding to 4 byte boundary
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* followed by the data for this inode.
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* The next inode follows after the data + padding to 4 byte
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* boundary.
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*/
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};
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struct envfs_inode_end {
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uint32_t magic; /* ENVFS_INODE_END_MAGIC */
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uint32_t mode; /* file mode */
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};
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/*
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* Superblock information at the beginning of the FS.
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*/
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struct envfs_super {
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uint32_t magic; /* ENVFS_MAGIC */
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uint32_t priority;
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uint32_t crc; /* crc for the data */
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uint32_t size; /* size of data */
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uint8_t major; /* major */
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uint8_t minor; /* minor */
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uint16_t future; /* reserved for future use */
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uint32_t flags; /* feature flags */
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uint32_t sb_crc; /* crc for the superblock */
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};
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#ifdef __BAREBOX__
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# ifdef __LITTLE_ENDIAN
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# define ENVFS_ORDER_LITTLE
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# elif defined __BIG_ENDIAN
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# define ENVFS_ORDER_BIG
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# else
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# error "could not determine byte order"
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# endif
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#else
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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# define ENVFS_ORDER_LITTLE
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# elif __BYTE_ORDER == __BIG_ENDIAN
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# define ENVFS_ORDER_BIG
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# else
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# error "could not determine byte order"
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# endif
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#endif
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#ifdef ENVFS_ORDER_LITTLE
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#define ENVFS_16(x) (x)
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#define ENVFS_24(x) (x)
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#define ENVFS_32(x) (x)
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#define ENVFS_GET_NAMELEN(x) ((x)->namelen)
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#define ENVFS_GET_OFFSET(x) ((x)->offset)
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#define ENVFS_SET_OFFSET(x,y) ((x)->offset = (y))
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#define ENVFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
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#elif defined ENVFS_ORDER_BIG
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#ifdef __KERNEL__
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#define ENVFS_16(x) swab16(x)
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#define ENVFS_24(x) ((swab32(x)) >> 8)
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#define ENVFS_32(x) swab32(x)
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#else /* not __KERNEL__ */
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#define ENVFS_16(x) bswap_16(x)
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#define ENVFS_24(x) ((bswap_32(x)) >> 8)
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#define ENVFS_32(x) bswap_32(x)
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#endif /* not __KERNEL__ */
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#define ENVFS_GET_NAMELEN(x) ENVFS_32(((x)->namelen))
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#define ENVFS_GET_OFFSET(x) ENVFS_32(((x)->offset))
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#define ENVFS_SET_NAMELEN(x,y)((x)->offset = ENVFS_32((y)))
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#define ENVFS_SET_OFFSET(x,y) ((x)->namelen = ENVFS_32((y)))
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#else
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#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
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#endif
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#define ENV_FLAG_NO_OVERWRITE (1 << 0)
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int envfs_load(const char *filename, const char *dirname, unsigned flags);
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int envfs_save(const char *filename, const char *dirname);
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int envfs_load_from_buf(void *buf, int len, const char *dir, unsigned flags);
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/* defaults to /dev/env0 */
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#ifdef CONFIG_ENV_HANDLING
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void default_environment_path_set(char *path);
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char *default_environment_path_get(void);
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#else
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static inline void default_environment_path_set(char *path)
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{
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}
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static inline char *default_environment_path_get(void)
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{
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return NULL;
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}
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#endif
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#ifdef CONFIG_DEFAULT_ENVIRONMENT
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void defaultenv_append(void *buf, unsigned int size, const char *name);
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int defaultenv_load(const char *dir, unsigned flags);
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#else
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static inline void defaultenv_append(void *buf, unsigned int size, const char *name)
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{
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}
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static inline int defaultenv_load(const char *dir, unsigned flags)
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{
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return -ENOSYS;
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}
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#endif
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/*
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* Append environment directory compiled into barebox with bbenv-y
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* to the default environment. The symbol is generated from the filename
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* during the build process. Replace '-' with '_' to get the name
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* from the filename.
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*/
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#define defaultenv_append_directory(name) \
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{ \
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extern char __bbenv_##name##_start[]; \
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extern char __bbenv_##name##_end[]; \
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defaultenv_append(__bbenv_##name##_start, \
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__bbenv_##name##_end - \
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__bbenv_##name##_start, \
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__stringify(name)); \
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}
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#endif /* _ENVFS_H */
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