cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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partitions.h (3946B)

      1/*
      2 * MTD partitioning layer definitions
      3 *
      4 * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
      5 *
      6 * This code is GPL
      7 */
      8
      9#ifndef MTD_PARTITIONS_H
     10#define MTD_PARTITIONS_H
     11
     12#include <linux/types.h>
     13
     14
     15/*
     16 * Partition definition structure:
     17 *
     18 * An array of struct partition is passed along with a MTD object to
     19 * mtd_device_register() to create them.
     20 *
     21 * For each partition, these fields are available:
     22 * name: string that will be used to label the partition's MTD device.
     23 * types: some partitions can be containers using specific format to describe
     24 *	embedded subpartitions / volumes. E.g. many home routers use "firmware"
     25 *	partition that contains at least kernel and rootfs. In such case an
     26 *	extra parser is needed that will detect these dynamic partitions and
     27 *	report them to the MTD subsystem. If set this property stores an array
     28 *	of parser names to use when looking for subpartitions.
     29 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
     30 * 	will extend to the end of the master MTD device.
     31 * offset: absolute starting position within the master MTD device; if
     32 * 	defined as MTDPART_OFS_APPEND, the partition will start where the
     33 *	previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;
     34 *	if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
     35 *	after the end of partition.
     36 * mask_flags: contains flags that have to be masked (removed) from the
     37 * 	master MTD flag set for the corresponding MTD partition.
     38 * 	For example, to force a read-only partition, simply adding
     39 * 	MTD_WRITEABLE to the mask_flags will do the trick.
     40 * add_flags: contains flags to add to the parent flags
     41 *
     42 * Note: writeable partitions require their size and offset be
     43 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
     44 */
     45
     46struct mtd_partition {
     47	const char *name;		/* identifier string */
     48	const char *const *types;	/* names of parsers to use if any */
     49	uint64_t size;			/* partition size */
     50	uint64_t offset;		/* offset within the master MTD space */
     51	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
     52	uint32_t add_flags;		/* flags to add to the partition */
     53	struct device_node *of_node;
     54};
     55
     56#define MTDPART_OFS_RETAIN	(-3)
     57#define MTDPART_OFS_NXTBLK	(-2)
     58#define MTDPART_OFS_APPEND	(-1)
     59#define MTDPART_SIZ_FULL	(0)
     60
     61
     62struct mtd_info;
     63struct device_node;
     64
     65/**
     66 * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
     67 * @origin: for RedBoot, start address of MTD device
     68 */
     69struct mtd_part_parser_data {
     70	unsigned long origin;
     71};
     72
     73
     74/*
     75 * Functions dealing with the various ways of partitioning the space
     76 */
     77
     78struct mtd_part_parser {
     79	struct list_head list;
     80	struct module *owner;
     81	const char *name;
     82	const struct of_device_id *of_match_table;
     83	int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
     84			struct mtd_part_parser_data *);
     85	void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
     86};
     87
     88/* Container for passing around a set of parsed partitions */
     89struct mtd_partitions {
     90	const struct mtd_partition *parts;
     91	int nr_parts;
     92	const struct mtd_part_parser *parser;
     93};
     94
     95extern int __register_mtd_parser(struct mtd_part_parser *parser,
     96				 struct module *owner);
     97#define register_mtd_parser(parser) __register_mtd_parser(parser, THIS_MODULE)
     98
     99extern void deregister_mtd_parser(struct mtd_part_parser *parser);
    100
    101/*
    102 * module_mtd_part_parser() - Helper macro for MTD partition parsers that don't
    103 * do anything special in module init/exit. Each driver may only use this macro
    104 * once, and calling it replaces module_init() and module_exit().
    105 */
    106#define module_mtd_part_parser(__mtd_part_parser) \
    107	module_driver(__mtd_part_parser, register_mtd_parser, \
    108		      deregister_mtd_parser)
    109
    110int mtd_add_partition(struct mtd_info *master, const char *name,
    111		      long long offset, long long length);
    112int mtd_del_partition(struct mtd_info *master, int partno);
    113uint64_t mtd_get_device_size(const struct mtd_info *mtd);
    114
    115#endif