/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef VBOOT_REFERENCE_CGPTLIB_H_
#define VBOOT_REFERENCE_CGPTLIB_H_

#include "sysincludes.h"
#include "gpt_misc.h"

/**
 * Provides the location of the next kernel partition, in order of decreasing
 * priority.
 *
 * On return the start_sector parameter contains the LBA sector for the start
 * of the kernel partition, and the size parameter contains the size of the
 * kernel partition in LBA sectors.  gpt.current_kernel contains the partition
 * index of the current chromeos kernel partition.
 *
 * Returns GPT_SUCCESS if successful, else
 *   GPT_ERROR_NO_VALID_KERNEL, no avaliable kernel, enters recovery mode */
int GptNextKernelEntry(GptData *gpt, uint64_t *start_sector, uint64_t *size);

/**
 * Updates the kernel entry with the specified index, using the specified type
 * of update (GPT_UPDATE_ENTRY_*).
 *
 * On return the modified field may be set, if the GPT data has been modified
 * and should be written to disk.
 *
 * Returns GPT_SUCCESS if successful, else
 *   GPT_ERROR_INVALID_UPDATE_TYPE, invalid 'update_type' is given.
 */
int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type);

#endif  /* VBOOT_REFERENCE_CGPTLIB_H_ */