1 files changed, 136 insertions, 0 deletions
diff --git a/libipt/src/pt_msec_cache.c b/libipt/src/pt_msec_cache.c
new file mode 100644
index 000000000000..c5db101bedb8
--- /dev/null
+++ b/libipt/src/pt_msec_cache.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2017-2019, 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_msec_cache.h"
+#include "pt_section.h"
+#include "pt_image.h"
+
+#include <string.h>
+
+
+int pt_msec_cache_init(struct pt_msec_cache *cache)
+{
+	if (!cache)
+		return -pte_internal;
+
+	memset(cache, 0, sizeof(*cache));
+
+	return 0;
+}
+
+void pt_msec_cache_fini(struct pt_msec_cache *cache)
+{
+	if (!cache)
+		return;
+
+	(void) pt_msec_cache_invalidate(cache);
+	pt_msec_fini(&cache->msec);
+}
+
+int pt_msec_cache_invalidate(struct pt_msec_cache *cache)
+{
+	struct pt_section *section;
+	int errcode;
+
+	if (!cache)
+		return -pte_internal;
+
+	section = pt_msec_section(&cache->msec);
+	if (!section)
+		return 0;
+
+	errcode = pt_section_unmap(section);
+	if (errcode < 0)
+		return errcode;
+
+	cache->msec.section = NULL;
+
+	return pt_section_put(section);
+}
+
+int pt_msec_cache_read(struct pt_msec_cache *cache,
+		       const struct pt_mapped_section **pmsec,
+		       struct pt_image *image, uint64_t vaddr)
+{
+	struct pt_mapped_section *msec;
+	int isid, errcode;
+
+	if (!cache || !pmsec)
+		return -pte_internal;
+
+	msec = &cache->msec;
+	isid = cache->isid;
+
+	errcode = pt_image_validate(image, msec, vaddr, isid);
+	if (errcode < 0)
+		return errcode;
+
+	*pmsec = msec;
+
+	return isid;
+
+}
+
+int pt_msec_cache_fill(struct pt_msec_cache *cache,
+		       const struct pt_mapped_section **pmsec,
+		       struct pt_image *image, const struct pt_asid *asid,
+		       uint64_t vaddr)
+{
+	struct pt_mapped_section *msec;
+	struct pt_section *section;
+	int errcode, isid;
+
+	if (!cache || !pmsec)
+		return -pte_internal;
+
+	errcode = pt_msec_cache_invalidate(cache);
+	if (errcode < 0)
+		return errcode;
+
+	msec = &cache->msec;
+
+	isid = pt_image_find(image, msec, asid, vaddr);
+	if (isid < 0)
+		return isid;
+
+	section = pt_msec_section(msec);
+
+	errcode = pt_section_map(section);
+	if (errcode < 0) {
+		(void) pt_section_put(section);
+		msec->section = NULL;
+
+		return errcode;
+	}
+
+	*pmsec = msec;
+
+	cache->isid = isid;
+
+	return isid;
+}