cbfs.h
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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __CBFS_H
#define __CBFS_H
#include <compiler.h>
#include <linux/compiler.h>
enum cbfs_result {
CBFS_SUCCESS = 0,
CBFS_NOT_INITIALIZED,
CBFS_BAD_HEADER,
CBFS_BAD_FILE,
CBFS_FILE_NOT_FOUND
};
enum cbfs_filetype {
CBFS_TYPE_STAGE = 0x10,
CBFS_TYPE_PAYLOAD = 0x20,
CBFS_TYPE_OPTIONROM = 0x30,
CBFS_TYPE_BOOTSPLASH = 0x40,
CBFS_TYPE_RAW = 0x50,
CBFS_TYPE_VSA = 0x51,
CBFS_TYPE_MBI = 0x52,
CBFS_TYPE_MICROCODE = 0x53,
CBFS_COMPONENT_CMOS_DEFAULT = 0xaa,
CBFS_COMPONENT_CMOS_LAYOUT = 0x01aa
};
struct cbfs_header {
u32 magic;
u32 version;
u32 rom_size;
u32 boot_block_size;
u32 align;
u32 offset;
u32 pad[2];
} __packed;
struct cbfs_fileheader {
u8 magic[8];
u32 len;
u32 type;
u32 checksum;
u32 offset;
} __packed;
struct cbfs_cachenode {
struct cbfs_cachenode *next;
u32 type;
void *data;
u32 data_length;
char *name;
u32 name_length;
u32 checksum;
} __packed;
extern enum cbfs_result file_cbfs_result;
/**
* file_cbfs_error() - Return a string describing the most recent error
* condition.
*
* @return A pointer to the constant string.
*/
const char *file_cbfs_error(void);
/**
* file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
*
* @end_of_rom: Points to the end of the ROM the CBFS should be read
* from.
*/
void file_cbfs_init(uintptr_t end_of_rom);
/**
* file_cbfs_get_header() - Get the header structure for the current CBFS.
*
* @return A pointer to the constant structure, or NULL if there is none.
*/
const struct cbfs_header *file_cbfs_get_header(void);
/**
* file_cbfs_get_first() - Get a handle for the first file in CBFS.
*
* @return A handle for the first file in CBFS, NULL on error.
*/
const struct cbfs_cachenode *file_cbfs_get_first(void);
/**
* file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
*
* @file: A pointer to the handle to advance.
*/
void file_cbfs_get_next(const struct cbfs_cachenode **file);
/**
* file_cbfs_find() - Find a file with a particular name in CBFS.
*
* @name: The name to search for.
*
* @return A handle to the file, or NULL on error.
*/
const struct cbfs_cachenode *file_cbfs_find(const char *name);
/***************************************************************************/
/* All of the functions below can be used without first initializing CBFS. */
/***************************************************************************/
/**
* file_cbfs_find_uncached() - Find a file with a particular name in CBFS
* without using the heap.
*
* @end_of_rom: Points to the end of the ROM the CBFS should be read
* from.
* @name: The name to search for.
*
* @return A handle to the file, or NULL on error.
*/
const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
const char *name);
/**
* file_cbfs_name() - Get the name of a file in CBFS.
*
* @file: The handle to the file.
*
* @return The name of the file, NULL on error.
*/
const char *file_cbfs_name(const struct cbfs_cachenode *file);
/**
* file_cbfs_size() - Get the size of a file in CBFS.
*
* @file: The handle to the file.
*
* @return The size of the file, zero on error.
*/
u32 file_cbfs_size(const struct cbfs_cachenode *file);
/**
* file_cbfs_type() - Get the type of a file in CBFS.
*
* @file: The handle to the file.
*
* @return The type of the file, zero on error.
*/
u32 file_cbfs_type(const struct cbfs_cachenode *file);
/**
* file_cbfs_read() - Read a file from CBFS into RAM
*
* @file: A handle to the file to read.
* @buffer: Where to read it into memory.
* @maxsize: Maximum number of bytes to read
*
* @return If positive or zero, the number of characters read. If negative, an
* error occurred.
*/
long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
unsigned long maxsize);
#endif /* __CBFS_H */