| /* |
| * Copyright (c) 2013-2015, 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; |
| } |