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/* SPDX-License-Identifier: BSD-3-Clause or GPL-2.0-only */
#ifndef FLASHMAP_LIB_FMAP_H__
#define FLASHMAP_LIB_FMAP_H__
#include <inttypes.h>
#include <valstr.h>
#define FMAP_SIGNATURE "__FMAP__"
#define FMAP_VER_MAJOR 1 /* this header's FMAP minor version */
#define FMAP_VER_MINOR 1 /* this header's FMAP minor version */
#define FMAP_STRLEN 32 /* maximum length for strings, */
/* including null-terminator */
extern const struct valstr flag_lut[16];
enum fmap_flags {
FMAP_AREA_STATIC = 1 << 0,
FMAP_AREA_COMPRESSED = 1 << 1,
FMAP_AREA_RO = 1 << 2,
FMAP_AREA_PRESERVE = 1 << 3,
};
/* Mapping of volatile and static regions in firmware binary */
struct fmap_area {
uint32_t offset; /* offset relative to base */
uint32_t size; /* size in bytes */
uint8_t name[FMAP_STRLEN]; /* descriptive name */
uint16_t flags; /* flags for this area */
} __packed;
struct fmap {
uint8_t signature[8]; /* "__FMAP__" (0x5F5F464D41505F5F) */
uint8_t ver_major; /* major version */
uint8_t ver_minor; /* minor version */
uint64_t base; /* address of the firmware binary */
uint32_t size; /* size of firmware binary in bytes */
uint8_t name[FMAP_STRLEN]; /* name of this firmware binary */
uint16_t nareas; /* number of areas described by
fmap_areas[] below */
struct fmap_area areas[];
} __packed;
/*
* fmap_find - find FMAP signature in a binary image
*
* @image: binary image
* @len: length of binary image
*
* This function does no error checking. The caller is responsible for
* verifying that the contents are sane.
*
* returns offset of FMAP signature to indicate success
* returns <0 to indicate failure
*/
extern long int fmap_find(const uint8_t *image, unsigned int len);
/*
* fmap_print - Print contents of flash map data structure
*
* @map: raw map data
*
* returns 0 to indicate success
* returns <0 to indicate failure
*/
extern int fmap_print(const struct fmap *map);
/*
* fmap_flags_to_string - convert raw flags field into user-friendly string
*
* @flags: raw flags
*
* This function returns a user-friendly comma-separated list of fmap area
* flags. If there are no flags (flags == 0), the string will contain only
* a terminating character ('\0')
*
* This function allocates memory which the caller must free.
*
* returns pointer to an allocated string if successful
* returns NULL to indicate failure
*/
char *fmap_flags_to_string(uint16_t flags);
/*
* fmap_create - allocate and initialize a new fmap structure
*
* @base: base address of firmware within address space
* @size: size of the firmware (bytes)
* @name: name of firmware
*
* This function will allocate a flashmap header. Members of the structure
* which are not passed in are automatically initialized.
*
* returns pointer to newly allocated flashmap header if successful
* returns NULL to indicate failure
*/
extern struct fmap *fmap_create(uint64_t base,
uint32_t size, uint8_t *name);
/* free memory used by an fmap structure */
extern void fmap_destroy(struct fmap *fmap);
/*
* fmap_size - returns size of fmap data structure (including areas)
*
* @fmap: fmap
*
* returns size of fmap structure if successful
* returns <0 to indicate failure
*/
extern int fmap_size(const struct fmap *fmap);
/*
* fmap_append_area - realloc an existing flashmap and append an area
*
* @fmap: double pointer to existing flashmap
* @offset: offset of area
* @size: size of area
* @name: name of area
* @flags: area flags
*
* returns total size of reallocated flashmap structure if successful
* returns <0 to indicate failure
*/
extern int fmap_append_area(struct fmap **fmap,
uint32_t offset, uint32_t size,
const uint8_t *name, uint16_t flags);
/*
* fmap_find_area - find an fmap_area entry (by name) and return pointer to it
*
* @fmap: fmap structure to parse
* @name: name of area to find
*
* returns a pointer to the entry in the fmap structure if successful
* returns NULL to indicate failure or if no matching area entry is found
*/
extern const struct fmap_area *fmap_find_area(const struct fmap *fmap,
const char *name);
/* unit testing stuff */
extern int fmap_test(void);
#endif /* FLASHMAP_LIB_FMAP_H__*/
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