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/*
* Copyright (c) 2013-2025, Intel Corporation
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#ifndef PT_TNT_CACHE_H
#define PT_TNT_CACHE_H
#include <stdint.h>
struct pt_packet_tnt;
struct pt_config;
/* Keeping track of tnt indicators. */
struct pt_tnt_cache {
/* The last tnt. */
uint64_t tnt;
/* The index into the above tnt.
*
* (tnt & index) gives the current tnt entry.
* (index >>= 1) moves the index to the next tnt entry.
* (index == 0) means that the current tnt is empty.
*/
uint64_t index;
};
/* Initialize (or reset) the tnt cache. */
extern void pt_tnt_cache_init(struct pt_tnt_cache *cache);
/* Check if the tnt cache is empty.
*
* Returns 0 if the tnt cache is not empty.
* Returns > 0 if the tnt cache is empty.
* Returns -pte_invalid if @cache is NULL.
*/
extern int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache);
/* Query the next tnt indicator.
*
* This consumes the returned tnt indicator in the cache.
*
* Returns 0 if the next branch is not taken.
* Returns > 0 if the next branch is taken.
* Returns -pte_invalid if @cache is NULL.
* Returns -pte_bad_query if there is no tnt cached.
*/
extern int pt_tnt_cache_query(struct pt_tnt_cache *cache);
/* Add TNT bits to the cache.
*
* Add the least significant @size bits from @tnt to @cache.
*
* Returns zero on success, a negative pt_error_code otherwise.
* Returns -pte_invalid if @cache is NULL.
* Returns -pte_overflow if @cache has not enough space.
*/
extern int pt_tnt_cache_add(struct pt_tnt_cache *cache, uint64_t tnt,
uint8_t size);
#endif /* PT_TNT_CACHE_H */
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