u-boot/include/cbfs.h
Simon Glass 630b2f39dd cbfs: Add functions to support multiple CBFSs
Sometimes an image has multiple CBFS. The current CBFS API is limited to
handling only one at time. Also it keeps track of the CBFS internally in
BSS, which does not work before relocation, for example.

Add a few new functions to overcome these limitations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
2019-08-18 21:54:10 +08:00

219 lines
5.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
*/
#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_BOOTBLOCK = 0x01,
CBFS_TYPE_CBFSHEADER = 0x02,
CBFS_TYPE_STAGE = 0x10,
CBFS_TYPE_PAYLOAD = 0x20,
CBFS_TYPE_FIT = 0x21,
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_TYPE_FSP = 0x60,
CBFS_TYPE_MRC = 0x61,
CBFS_TYPE_MMA = 0x62,
CBFS_TYPE_EFI = 0x63,
CBFS_TYPE_STRUCT = 0x70,
CBFS_TYPE_CMOS_DEFAULT = 0xaa,
CBFS_TYPE_SPD = 0xab,
CBFS_TYPE_MRC_CACHE = 0xac,
CBFS_TYPE_CMOS_LAYOUT = 0x01aa
};
enum {
CBFS_HEADER_MAGIC = 0x4f524243,
};
/**
* struct cbfs_header - header at the start of a CBFS region
*
* All fields use big-endian format.
*
* @magic: Magic number (CBFS_HEADER_MAGIC)
*/
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;
/* offset to struct cbfs_file_attribute or 0 */
u32 attributes_offset;
u32 offset;
} __packed;
struct cbfs_cachenode {
struct cbfs_cachenode *next;
u32 type;
void *data;
u32 data_length;
char *name;
u32 name_length;
u32 attributes_offset;
} __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);
/**
* cbfs_get_result() - Get the result of the last CBFS operation
*
*@return last result
*/
enum cbfs_result cbfs_get_result(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);
struct cbfs_priv *priv;
/**
* cbfs_find_file() - Find a file in a given CBFS
*
* @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
* @name: Filename to look for
* @return pointer to CBFS node if found, else NULL
*/
const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
const char *name);
/**
* cbfs_init_mem() - Set up a new CBFS
*
* @base: Base address of CBFS
* @size: Size of CBFS in bytes
* @cbfsp: Returns a pointer to CBFS on success
* @return 0 if OK, -ve on error
*/
int cbfs_init_mem(ulong base, ulong size, struct cbfs_priv **privp);
/***************************************************************************/
/* 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 */