274 lines
9.5 KiB
C
274 lines
9.5 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
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* Copyright (C) 2012 Google, Inc.
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*
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* This file is dual-licensed. You can choose between:
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* - The GNU GPL, version 2, as published by the Free Software Foundation
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* - The revised BSD license (without advertising clause)
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*
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* ---------------------------------------------------------------------------
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.
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* ---------------------------------------------------------------------------
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ---------------------------------------------------------------------------
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*/
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#ifndef _CBFS_CORE_H_
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#define _CBFS_CORE_H_
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#include <endian.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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/** These are standard values for the known compression
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alogrithms that coreboot knows about for stages and
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payloads. Of course, other CBFS users can use whatever
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values they want, as long as they understand them. */
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#define CBFS_COMPRESS_NONE 0
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#define CBFS_COMPRESS_LZMA 1
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/** These are standard component types for well known
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components (i.e - those that coreboot needs to consume.
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Users are welcome to use any other value for their
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components */
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#define CBFS_TYPE_STAGE 0x10
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#define CBFS_TYPE_PAYLOAD 0x20
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#define CBFS_TYPE_OPTIONROM 0x30
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#define CBFS_TYPE_BOOTSPLASH 0x40
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#define CBFS_TYPE_RAW 0x50
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#define CBFS_TYPE_VSA 0x51
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#define CBFS_TYPE_MBI 0x52
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#define CBFS_TYPE_MICROCODE 0x53
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#define CBFS_COMPONENT_CMOS_DEFAULT 0xaa
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#define CBFS_COMPONENT_CMOS_LAYOUT 0x01aa
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#define CBFS_HEADER_MAGIC 0x4F524243
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#define CBFS_HEADER_VERSION1 0x31313131
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#define CBFS_HEADER_VERSION2 0x31313132
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#define CBFS_HEADER_VERSION CBFS_HEADER_VERSION2
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#define CBFS_HEADER_INVALID_ADDRESS ((void*)(0xffffffff))
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/* this is the master cbfs header - it must be located somewhere available
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* to bootblock (to load romstage). The last 4 bytes in the image contain its
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* relative offset from the end of the image (as a 32-bit signed integer). */
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struct cbfs_header {
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uint32_t magic;
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uint32_t version;
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uint32_t romsize;
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uint32_t bootblocksize;
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uint32_t align; /* fixed to 64 bytes */
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uint32_t offset;
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uint32_t architecture;
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uint32_t pad[1];
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} __attribute__((packed));
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/* this used to be flexible, but wasn't ever set to something different. */
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#define CBFS_ALIGNMENT 64
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/* "Unknown" refers to CBFS headers version 1,
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* before the architecture was defined (i.e., x86 only).
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*/
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#define CBFS_ARCHITECTURE_UNKNOWN 0xFFFFFFFF
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#define CBFS_ARCHITECTURE_X86 0x00000001
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#define CBFS_ARCHITECTURE_ARM 0x00000010
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#define CBFS_ARCHITECTURE_ARM64 0x00000011
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/** This is a component header - every entry in the CBFS
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will have this header.
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This is how the component is arranged in the ROM:
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-------------- <- 0
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component header
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-------------- <- sizeof(struct component)
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component name
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-------------- <- offset
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data
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...
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-------------- <- offset + len
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*/
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#define CBFS_FILE_MAGIC "LARCHIVE"
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struct cbfs_file {
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char magic[8];
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uint32_t len;
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uint32_t type;
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uint32_t attributes_offset;
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uint32_t offset;
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char filename[];
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} __attribute__((packed));
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/* Depending on how the header was initialized, it may be backed with 0x00 or
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* 0xff. Support both. */
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#define CBFS_FILE_ATTR_TAG_UNUSED 0
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#define CBFS_FILE_ATTR_TAG_UNUSED2 0xffffffff
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#define CBFS_FILE_ATTR_TAG_COMPRESSION 0x42435a4c
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/* The common fields of extended cbfs file attributes.
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Attributes are expected to start with tag/len, then append their
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specific fields. */
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struct cbfs_file_attribute {
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uint32_t tag;
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/* len covers the whole structure, incl. tag and len */
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uint32_t len;
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uint8_t data[0];
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} __attribute__((packed));
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struct cbfs_file_attr_compression {
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uint32_t tag;
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uint32_t len;
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/* whole file compression format. 0 if no compression. */
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uint32_t compression;
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uint32_t decompressed_size;
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} __attribute__((packed));
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/* Given a cbfs_file, return the first file attribute, or NULL. */
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struct cbfs_file_attribute *cbfs_file_first_attr(struct cbfs_file *file);
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/* Given a cbfs_file and a cbfs_file_attribute, return the attribute that
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* follows it, or NULL. */
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struct cbfs_file_attribute *cbfs_file_next_attr(struct cbfs_file *file,
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struct cbfs_file_attribute *attr);
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/* Given a cbfs_file and an attribute tag, return the first instance of the
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* attribute or NULL if none found. */
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struct cbfs_file_attribute *cbfs_file_find_attr(struct cbfs_file *file,
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uint32_t tag);
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/*** Component sub-headers ***/
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/* Following are component sub-headers for the "standard"
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component types */
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/** This is the sub-header for stage components. Stages are
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loaded by coreboot during the normal boot process */
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struct cbfs_stage {
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uint32_t compression; /** Compression type */
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uint64_t entry; /** entry point */
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uint64_t load; /** Where to load in memory */
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uint32_t len; /** length of data to load */
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uint32_t memlen; /** total length of object in memory */
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} __attribute__((packed));
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/** this is the sub-header for payload components. Payloads
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are loaded by coreboot at the end of the boot process */
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struct cbfs_payload_segment {
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uint32_t type;
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uint32_t compression;
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uint32_t offset;
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uint64_t load_addr;
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uint32_t len;
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uint32_t mem_len;
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} __attribute__((packed));
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struct cbfs_payload {
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struct cbfs_payload_segment segments;
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};
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#define PAYLOAD_SEGMENT_CODE 0x45444F43
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#define PAYLOAD_SEGMENT_DATA 0x41544144
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#define PAYLOAD_SEGMENT_BSS 0x20535342
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#define PAYLOAD_SEGMENT_PARAMS 0x41524150
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#define PAYLOAD_SEGMENT_ENTRY 0x52544E45
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struct cbfs_optionrom {
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uint32_t compression;
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uint32_t len;
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} __attribute__((packed));
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#define CBFS_NAME(_c) (((char *) (_c)) + sizeof(struct cbfs_file))
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#define CBFS_SUBHEADER(_p) ( (void *) ((((uint8_t *) (_p)) + ntohl((_p)->offset))) )
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#define CBFS_MEDIA_INVALID_MAP_ADDRESS ((void*)(0xffffffff))
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#define CBFS_DEFAULT_MEDIA ((void*)(0x0))
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/* Media for CBFS to load files. */
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struct cbfs_media {
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/* implementation dependent context, to hold resource references */
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void *context;
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/* opens media and returns 0 on success, -1 on failure */
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int (*open)(struct cbfs_media *media);
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/* returns number of bytes read from media into dest, starting from
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* offset for count of bytes */
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size_t (*read)(struct cbfs_media *media, void *dest, size_t offset,
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size_t count);
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/* returns a pointer to memory with count of bytes from media source
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* starting from offset, or CBFS_MEDIA_INVALID_MAP_ADDRESS on failure.
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* Note: mapped data can't be free unless unmap is called, even if you
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* do close first. */
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void * (*map)(struct cbfs_media *media, size_t offset, size_t count);
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/* returns NULL and releases the memory by address, which was allocated
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* by map */
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void * (*unmap)(struct cbfs_media *media, const void *address);
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/* closes media and returns 0 on success, -1 on failure. */
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int (*close)(struct cbfs_media *media);
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};
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/* returns pointer to a file entry inside CBFS or NULL on error */
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struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);
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/*
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* Returns pointer to a copy of the file content or NULL on error.
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* If the file is compressed, data will be decompressed.
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* The caller owns the returned memory.
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*/
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void *cbfs_get_file_content(struct cbfs_media *media, const char *name,
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int type, size_t *sz);
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/* returns decompressed size on success, 0 on failure */
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int cbfs_decompress(int algo, void *src, void *dst, int len);
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/* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS
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* on failure */
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const struct cbfs_header *cbfs_get_header(struct cbfs_media *media);
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#endif
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