/*
 * This file is part of the coreboot project.
 *
 * Copyright 2015 Google Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _CBFS_H_
#define _CBFS_H_

#include <commonlib/cbfs.h>
#include <program_loading.h>

/***********************************************
 * Perform CBFS operations on the boot device. *
 ***********************************************/

/* Return mapping of option ROM found in boot device. NULL on error. */
void *cbfs_boot_map_optionrom(uint16_t vendor, uint16_t device);
/* Load stage by name into memory. Returns entry address on success. NULL on
 * failure. */
void *cbfs_boot_load_stage_by_name(const char *name);
/* Locate file by name and optional type. Return 0 on success. < 0 on error. */
int cbfs_boot_locate(struct cbfsf *fh, const char *name, uint32_t *type);
/* Map file into memory leaking the mapping. Only should be used when
 * leaking mappings are a no-op. Returns NULL on error, else returns
 * the mapping and sets the size of the file. */
void *cbfs_boot_map_with_leak(const char *name, uint32_t type, size_t *size);
/* Locate file in a specific region of fmap. Return 0 on success. < 0 on error*/
int cbfs_locate_file_in_region(struct cbfsf *fh, const char *region_name,
		const char *name, uint32_t *type);
/* Load an arbitrary type file from CBFS into a buffer. Returns amount of
 * loaded bytes on success or 0 on error. File will get decompressed as
 * necessary.  Same decompression requirements as
 * cbfs_load_and_decompress(). */
size_t cbfs_boot_load_file(const char *name, void *buf, size_t buf_size,
	uint32_t type);
/* Load |in_size| bytes from |rdev| at |offset| to the |buffer_size| bytes
 * large |buffer|, decompressing it according to |compression| in the process.
 * Returns the decompressed file size, or 0 on error.
 * LZMA files will be mapped for decompression. LZ4 files will be decompressed
 * in-place with the buffer size requirements outlined in compression.h. */
size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
	size_t in_size, void *buffer, size_t buffer_size, uint32_t compression);

/* Return the size and fill base of the memory pstage will occupy after
 * loaded.
 */
size_t cbfs_prog_stage_section(struct prog *pstage, uintptr_t *base);

/* Load stage into memory filling in prog. Return 0 on success. < 0 on error. */
int cbfs_prog_stage_load(struct prog *prog);

/*****************************************************************
 * Support structures and functions. Direct field access should  *
 * only be done by implementers of cbfs regions -- Not the above *
 * API.                                                          *
 *****************************************************************/

/* The cbfs_props struct describes the properties associated with a CBFS. */
struct cbfs_props {
	/* CBFS starts at the following offset within the boot region. */
	size_t offset;
	/* CBFS size. */
	size_t size;
};

/* Default CBFS locator .locate() callback that locates "COREBOOT" region. This
   function is exposed to reduce code duplication in other parts of the code
   base. To obtain the correct region device the selection process is required
   by way of cbfs_boot_region_device(). */
int cbfs_default_region_device(struct region_device *rdev);

/* Select the boot region device from the cbfs locators.
   Return < 0 on error, 0 on success. */
int cbfs_boot_region_device(struct region_device *rdev);

/* Object used to identify location of current cbfs to use for cbfs_boot_*
 * operations. It's used by cbfs_boot_region_properties(). */
struct cbfs_locator {
	const char *name;
	/* Returns 0 on successful fill of cbfs properties. */
	int (*locate)(struct region_device *rdev);
};

#endif