1 files changed, 89 insertions, 0 deletions
diff --git a/libipt/src/pt_tnt_cache.c b/libipt/src/pt_tnt_cache.c
new file mode 100644
index 0000000000000..74a0988c7b205
--- /dev/null
+++ b/libipt/src/pt_tnt_cache.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2013-2019, 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;
+}