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a202f17d7b
CBFS now supports compressed filed. Add support for reading this information so that the correct decompression can be applied. The decompression itself is not implemented in CBFS. Signed-off-by: Simon Glass <sjg@chromium.org>
297 lines
7.5 KiB
C
297 lines
7.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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*/
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#ifndef __CBFS_H
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#define __CBFS_H
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#include <compiler.h>
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#include <linux/compiler.h>
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struct cbfs_priv;
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enum cbfs_result {
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CBFS_SUCCESS = 0,
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CBFS_NOT_INITIALIZED,
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CBFS_BAD_HEADER,
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CBFS_BAD_FILE,
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CBFS_FILE_NOT_FOUND
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};
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enum cbfs_filetype {
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CBFS_TYPE_BOOTBLOCK = 0x01,
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CBFS_TYPE_CBFSHEADER = 0x02,
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CBFS_TYPE_STAGE = 0x10,
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CBFS_TYPE_PAYLOAD = 0x20,
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CBFS_TYPE_FIT = 0x21,
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CBFS_TYPE_OPTIONROM = 0x30,
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CBFS_TYPE_BOOTSPLASH = 0x40,
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CBFS_TYPE_RAW = 0x50,
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CBFS_TYPE_VSA = 0x51,
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CBFS_TYPE_MBI = 0x52,
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CBFS_TYPE_MICROCODE = 0x53,
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CBFS_TYPE_FSP = 0x60,
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CBFS_TYPE_MRC = 0x61,
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CBFS_TYPE_MMA = 0x62,
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CBFS_TYPE_EFI = 0x63,
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CBFS_TYPE_STRUCT = 0x70,
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CBFS_TYPE_CMOS_DEFAULT = 0xaa,
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CBFS_TYPE_SPD = 0xab,
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CBFS_TYPE_MRC_CACHE = 0xac,
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CBFS_TYPE_CMOS_LAYOUT = 0x01aa
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};
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enum {
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CBFS_HEADER_MAGIC = 0x4f524243,
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CBFS_SIZE_UNKNOWN = 0xffffffff,
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CBFS_ALIGN_SIZE = 0x40,
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};
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/**
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* struct cbfs_header - header at the start of a CBFS region
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*
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* All fields use big-endian format.
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*
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* @magic: Magic number (CBFS_HEADER_MAGIC)
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*/
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struct cbfs_header {
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u32 magic;
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u32 version;
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u32 rom_size;
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u32 boot_block_size;
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u32 align;
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u32 offset;
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u32 pad[2];
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} __packed;
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struct cbfs_fileheader {
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u8 magic[8];
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u32 len;
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u32 type;
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/* offset to struct cbfs_file_attribute or 0 */
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u32 attributes_offset;
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u32 offset;
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char filename[];
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} __packed;
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/**
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* These are standard values for the known compression alogrithms that coreboot
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* knows about for stages and payloads. Of course, other CBFS users can use
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* whatever values they want, as long as they understand them.
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*/
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#define CBFS_COMPRESS_NONE 0
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#define CBFS_COMPRESS_LZMA 1
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#define CBFS_COMPRESS_LZ4 2
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/*
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* Depending on how the header was initialized, it may be backed with 0x00 or
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* 0xff, so support both
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*/
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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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#define CBFS_FILE_ATTR_TAG_HASH 0x68736148
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/*
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* The common fields of extended cbfs file attributes. Attributes are expected
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* to start with tag/len, then append their specific fields
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*/
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struct cbfs_file_attribute {
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u32 tag;
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/* len covers the whole structure, incl. tag and len */
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u32 len;
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u8 data[0];
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} __packed;
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struct cbfs_file_attr_compression {
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u32 tag;
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u32 len;
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/* whole file compression format. 0 if no compression. */
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u32 compression;
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u32 decompressed_size;
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} __packed;
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struct cbfs_file_attr_hash {
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u32 tag;
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u32 len;
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u32 hash_type;
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/* hash_data is len - sizeof(struct) bytes */
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u8 hash_data[];
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} __packed;
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struct cbfs_cachenode {
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struct cbfs_cachenode *next;
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void *data;
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char *name;
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u32 type;
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u32 data_length;
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u32 name_length;
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u32 attr_offset;
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u32 comp_algo;
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u32 decomp_size;
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};
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/**
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* file_cbfs_error() - Return a string describing the most recent error
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* condition.
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*
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* @return A pointer to the constant string.
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*/
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const char *file_cbfs_error(void);
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/**
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* cbfs_get_result() - Get the result of the last CBFS operation
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*
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*@return last result
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*/
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enum cbfs_result cbfs_get_result(void);
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/**
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* file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
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*
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* @end_of_rom: Points to the end of the ROM the CBFS should be read from
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* @return 0 if OK, -ve on error
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*/
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int file_cbfs_init(ulong end_of_rom);
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/**
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* file_cbfs_get_header() - Get the header structure for the current CBFS.
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*
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* @return A pointer to the constant structure, or NULL if there is none.
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*/
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const struct cbfs_header *file_cbfs_get_header(void);
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/**
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* cbfs_get_first() - Get the first file in a CBFS
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*
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* @return pointer to first file, or NULL if it is empty
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*/
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const struct cbfs_cachenode *cbfs_get_first(const struct cbfs_priv *priv);
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/**
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* cbfs_get_next() - Get the next file in a CBFS
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*
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* @filep: Pointer to current file; updated to point to the next file, if any,
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* else NULL
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*/
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void cbfs_get_next(const struct cbfs_cachenode **filep);
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/**
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* file_cbfs_get_first() - Get a handle for the first file in CBFS.
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*
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* @return A handle for the first file in CBFS, NULL on error.
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*/
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const struct cbfs_cachenode *file_cbfs_get_first(void);
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/**
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* file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
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*
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* @file: A pointer to the handle to advance.
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*/
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void file_cbfs_get_next(const struct cbfs_cachenode **file);
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/**
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* file_cbfs_find() - Find a file with a particular name in CBFS.
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*
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* @name: The name to search for.
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*
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* @return A handle to the file, or NULL on error.
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*/
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const struct cbfs_cachenode *file_cbfs_find(const char *name);
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/**
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* cbfs_find_file() - Find a file in a given CBFS
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*
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* @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
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* @name: Filename to look for
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* @return pointer to CBFS node if found, else NULL
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*/
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const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
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const char *name);
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/**
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* cbfs_init_mem() - Set up a new CBFS
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*
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* @base: Base address of CBFS
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* @size: Size of CBFS if known, else CBFS_SIZE_UNKNOWN
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* @require_header: true to read a header at the start, false to not require one
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* @cbfsp: Returns a pointer to CBFS on success
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* @return 0 if OK, -ve on error
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*/
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int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
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struct cbfs_priv **privp);
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/***************************************************************************/
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/* All of the functions below can be used without first initializing CBFS. */
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/***************************************************************************/
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/**
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* file_cbfs_find_uncached() - Find a file in CBFS given the end of the ROM
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*
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* Note that @node should be declared by the caller. This design is to avoid
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* the need for allocation here.
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*
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* @end_of_rom: Points to the end of the ROM the CBFS should be read from
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* @name: The name to search for
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* @node: Returns the contents of the node if found (i.e. copied into *node)
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* @return 0 on success, -ENOENT if not found, -EFAULT on bad header
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*/
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int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
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struct cbfs_cachenode *node);
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/**
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* file_cbfs_find_uncached_base() - Find a file in CBFS given the base address
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*
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* Note that @node should be declared by the caller. This design is to avoid
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* the need for allocation here.
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*
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* @base: Points to the base of the CBFS
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* @name: The name to search for
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* @node: Returns the contents of the node if found (i.e. copied into *node)
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* @return 0 on success, -ENOENT if not found, -EFAULT on bad header
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*/
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int file_cbfs_find_uncached_base(ulong base, const char *name,
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struct cbfs_cachenode *node);
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/**
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* file_cbfs_name() - Get the name of a file in CBFS.
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*
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* @file: The handle to the file.
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*
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* @return The name of the file, NULL on error.
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*/
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const char *file_cbfs_name(const struct cbfs_cachenode *file);
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/**
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* file_cbfs_size() - Get the size of a file in CBFS.
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*
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* @file: The handle to the file.
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*
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* @return The size of the file, zero on error.
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*/
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u32 file_cbfs_size(const struct cbfs_cachenode *file);
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/**
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* file_cbfs_type() - Get the type of a file in CBFS.
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*
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* @file: The handle to the file.
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*
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* @return The type of the file, zero on error.
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*/
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u32 file_cbfs_type(const struct cbfs_cachenode *file);
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/**
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* file_cbfs_read() - Read a file from CBFS into RAM
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*
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* @file: A handle to the file to read.
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* @buffer: Where to read it into memory.
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* @maxsize: Maximum number of bytes to read
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*
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* @return If positive or zero, the number of characters read. If negative, an
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* error occurred.
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*/
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long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
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unsigned long maxsize);
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#endif /* __CBFS_H */
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