1/*
2 * Copyright (c) 2013-2019, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 *  * Redistributions of source code must retain the above copyright notice,
8 *    this list of conditions and the following disclaimer.
9 *  * Redistributions in binary form must reproduce the above copyright notice,
10 *    this list of conditions and the following disclaimer in the documentation
11 *    and/or other materials provided with the distribution.
12 *  * Neither the name of Intel Corporation nor the names of its contributors
13 *    may be used to endorse or promote products derived from this software
14 *    without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "pt_tnt_cache.h"
30
31#include "intel-pt.h"
32
33
34void pt_tnt_cache_init(struct pt_tnt_cache *cache)
35{
36	if (!cache)
37		return;
38
39	cache->tnt = 0ull;
40	cache->index = 0ull;
41}
42
43int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache)
44{
45	if (!cache)
46		return -pte_invalid;
47
48	return cache->index == 0;
49}
50
51int pt_tnt_cache_query(struct pt_tnt_cache *cache)
52{
53	int taken;
54
55	if (!cache)
56		return -pte_invalid;
57
58	if (!cache->index)
59		return -pte_bad_query;
60
61	taken = (cache->tnt & cache->index) != 0;
62	cache->index >>= 1;
63
64	return taken;
65}
66
67int pt_tnt_cache_update_tnt(struct pt_tnt_cache *cache,
68			    const struct pt_packet_tnt *packet,
69			    const struct pt_config *config)
70{
71	uint8_t bit_size;
72
73	(void) config;
74
75	if (!cache || !packet)
76		return -pte_invalid;
77
78	if (cache->index)
79		return -pte_bad_context;
80
81	bit_size = packet->bit_size;
82	if (!bit_size)
83		return -pte_bad_packet;
84
85	cache->tnt = packet->payload;
86	cache->index = 1ull << (bit_size - 1);
87
88	return 0;
89}
90