src/include/cbfs_core.h

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
 * Copyright (C) 2012 Google, Inc.
 * Copyright (C) 2013 The Chromium OS Authors. All rights reserved.
 *
 * This file is dual-licensed. You can choose between:
 *   - The GNU GPL, version 2, as published by the Free Software Foundation
 *   - The revised BSD license (without advertising clause)
 *
 * ---------------------------------------------------------------------------
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
 * ---------------------------------------------------------------------------
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 _CBFS_CORE_H_
#define _CBFS_CORE_H_

#include <endian.h>
#include <stddef.h>
#include <stdint.h>

/** These are standard values for the known compression
    alogrithms that coreboot knows about for stages and
    payloads.  Of course, other CBFS users can use whatever
    values they want, as long as they understand them. */

#define CBFS_COMPRESS_NONE  0
#define CBFS_COMPRESS_LZMA  1

/** These are standard component types for well known
    components (i.e - those that coreboot needs to consume.
    Users are welcome to use any other value for their
    components */

#define CBFS_TYPE_STAGE      0x10
#define CBFS_TYPE_PAYLOAD    0x20
#define CBFS_TYPE_OPTIONROM  0x30
#define CBFS_TYPE_BOOTSPLASH 0x40
#define CBFS_TYPE_RAW        0x50
#define CBFS_TYPE_VSA        0x51
#define CBFS_TYPE_MBI        0x52
#define CBFS_TYPE_MICROCODE  0x53
#define CBFS_COMPONENT_CMOS_DEFAULT 0xaa
#define CBFS_COMPONENT_CMOS_LAYOUT 0x01aa

#define CBFS_HEADER_MAGIC  0x4F524243
#define CBFS_HEADER_VERSION1 0x31313131
#define CBFS_HEADER_VERSION2 0x31313132
#define CBFS_HEADER_VERSION  CBFS_HEADER_VERSION2

#define CBFS_HEADER_INVALID_ADDRESS	((void*)(0xffffffff))

/** this is the master cbfs header - it need to be located somewhere available
    to bootblock (to load romstage).  Where it actually lives is up to coreboot.
    On x86, a pointer to this header will live at 0xFFFFFFFC.
    For other platforms, you need to define CONFIG_CBFS_HEADER_ROM_OFFSET */

struct cbfs_header {
	uint32_t magic;
	uint32_t version;
	uint32_t romsize;
	uint32_t bootblocksize;
	uint32_t align;
	uint32_t offset;
	uint32_t architecture;
	uint32_t pad[1];
} __attribute__((packed));

/* "Unknown" refers to CBFS headers version 1,
 * before the architecture was defined (i.e., x86 only).
 */
#define CBFS_ARCHITECTURE_UNKNOWN  0xFFFFFFFF
#define CBFS_ARCHITECTURE_X86      0x00000001
#define CBFS_ARCHITECTURE_ARM      0x00000010

/** This is a component header - every entry in the CBFS
    will have this header.

    This is how the component is arranged in the ROM:

    --------------   <- 0
    component header
    --------------   <- sizeof(struct component)
    component name
    --------------   <- offset
    data
    ...
    --------------   <- offset + len
*/

#define CBFS_FILE_MAGIC "LARCHIVE"

struct cbfs_file {
	char magic[8];
	uint32_t len;
	uint32_t type;
	uint32_t checksum;
	uint32_t offset;
} __attribute__((packed));

/*** Component sub-headers ***/

/* Following are component sub-headers for the "standard"
   component types */

/** This is the sub-header for stage components.  Stages are
    loaded by coreboot during the normal boot process */

struct cbfs_stage {
	uint32_t compression;  /** Compression type */
	uint64_t entry;  /** entry point */
	uint64_t load;   /** Where to load in memory */
	uint32_t len;          /** length of data to load */
	uint32_t memlen;	   /** total length of object in memory */
} __attribute__((packed));

/** this is the sub-header for payload components.  Payloads are
 *    loaded by coreboot or other payloads at the end of the boot
 *    process
 */

struct cbfs_payload_segment {
	uint32_t type;
	uint32_t compression;
	uint32_t offset;
	uint64_t load_addr;
	uint32_t len;
	uint32_t mem_len;
} __attribute__((packed));

struct cbfs_payload {
	struct cbfs_payload_segment segments;
};

/* for returning payload info to (e.g.) bayou.
 * Return the file header, payload header, and name.
 * It must be done this way because we can't
 * assume file headers and names are contiguous.
 * Walking the headers can be expensive, so we get all
 * the information we can.
 */
struct cbfs_payload_info {
	struct cbfs_file file;
	struct cbfs_payload payload;
	const char *name;
};

#define PAYLOAD_SEGMENT_CODE   0x45444F43
#define PAYLOAD_SEGMENT_DATA   0x41544144
#define PAYLOAD_SEGMENT_BSS    0x20535342
#define PAYLOAD_SEGMENT_PARAMS 0x41524150
#define PAYLOAD_SEGMENT_ENTRY  0x52544E45

struct cbfs_optionrom {
	uint32_t compression;
	uint32_t len;
} __attribute__((packed));

#define CBFS_NAME(_c) (((char *) (_c)) + sizeof(struct cbfs_file))
#define CBFS_SUBHEADER(_p) ( (void *) ((((uint8_t *) (_p)) + ntohl((_p)->offset))) )

#define CBFS_MEDIA_INVALID_MAP_ADDRESS	((void*)(0xffffffff))
#define CBFS_DEFAULT_MEDIA		((void*)(0x0))

/* Media for CBFS to load files. */
struct cbfs_media {

	/* implementation dependent context, to hold resource references */
	void *context;

	/* opens media and returns 0 on success, -1 on failure */
	int (*open)(struct cbfs_media *media);

	/* returns number of bytes read from media into dest, starting from
	 * offset for count of bytes */
	size_t (*read)(struct cbfs_media *media, void *dest, size_t offset,
		       size_t count);

	/* returns a pointer to memory with count of bytes from media source
	 * starting from offset, or CBFS_MEDIA_INVALID_MAP_ADDRESS on failure.
	 * Note: mapped data can't be free unless unmap is called, even if you
	 * do close first. */
	void * (*map)(struct cbfs_media *media, size_t offset, size_t count);

	/* returns NULL and releases the memory by address, which was allocated
	 * by map */
	void * (*unmap)(struct cbfs_media *media, const void *address);

	/* closes media and returns 0 on success, -1 on failure. */
	int (*close)(struct cbfs_media *media);
};

/* returns pointer to a file entry inside CBFS or NULL */
struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);

/* Fills the pointer info with an array of payload file info structs.
 * Reads at most maxentries items.
 * Returns number we found.
 */
int cbfs_payload_headers(struct cbfs_media *media,
			 struct cbfs_payload_info *info,
			 int maxentries);

/* returns pointer to file content inside CBFS after if type is correct */
void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
			    int type);

/* returns 0 on success, -1 on failure */
int cbfs_decompress(int algo, void *src, void *dst, int len);

/* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS
 *  on failure */
const struct cbfs_header *cbfs_get_header(struct cbfs_media *media);

#endif