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diff --git a/libipt/internal/include/pt_asid.h b/libipt/internal/include/pt_asid.h
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+++ b/libipt/internal/include/pt_asid.h
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+/*
+ * Copyright (c) 2014-2019, 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.
+ */
+
+#ifndef PT_ASID_H
+#define PT_ASID_H
+
+#include <stddef.h>
+
+struct pt_asid;
+
+
+/* Read an asid provided by our user.
+ *
+ * Translate a user-provided asid in @user into @asid.  This uses default values
+ * for fields that are not provided by the user and for all fields, if @user is
+ * NULL.
+ *
+ * Fields set in @user that are not known (i.e. from a newer version of this
+ * library) will be ignored.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ * Returns -pte_internal, if @asid is NULL.
+ */
+extern int pt_asid_from_user(struct pt_asid *asid, const struct pt_asid *user);
+
+/* Provide an asid to the user.
+ *
+ * Translate @asid into a potentially older or newer version in @user.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ * Returns -pte_internal, if @user or @asid is NULL.
+ * Returns -pte_invalid, if @size is too small.
+ */
+extern int pt_asid_to_user(struct pt_asid *user, const struct pt_asid *asid,
+			   size_t size);
+
+/* Match two asids.
+ *
+ * Asids match if all fields provide either default values or are identical.
+ *
+ * Returns a positive number if @lhs matches @rhs.
+ * Returns zero if @lhs does not match @rhs.
+ * Returns a negative error code otherwise.
+ *
+ * Returns -pte_internal if @lhs or @rhs are NULL.
+ */
+extern int pt_asid_match(const struct pt_asid *lhs, const struct pt_asid *rhs);
+
+#endif /* PT_ASID_H */