/*
   * 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 */