/*

 * Copyright (c) 2013-2017, Intel Corporation

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  * Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *  * Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *  * Neither the name of Intel Corporation nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#include "pt_tnt_cache.h"

#include "intel-pt.h"

void pt_tnt_cache_init(struct pt_tnt_cache *cache)

{

	if (!cache)

		return;

	cache->tnt = 0ull;

	cache->index = 0ull;

}

int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache)

{

	if (!cache)

		return -pte_invalid;

	return cache->index == 0;

}

int pt_tnt_cache_query(struct pt_tnt_cache *cache)

{

	int taken;

	if (!cache)

		return -pte_invalid;

	if (!cache->index)

		return -pte_bad_query;

	taken = (cache->tnt & cache->index) != 0;

	cache->index >>= 1;

	return taken;

}

int pt_tnt_cache_update_tnt(struct pt_tnt_cache *cache,

			    const struct pt_packet_tnt *packet,

			    const struct pt_config *config)

{

	uint8_t bit_size;

	(void) config;

	if (!cache || !packet)

		return -pte_invalid;

	if (cache->index)

		return -pte_bad_context;

	bit_size = packet->bit_size;

	if (!bit_size)

		return -pte_bad_packet;

	cache->tnt = packet->payload;

	cache->index = 1ull << (bit_size - 1);

	return 0;

}