1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 #if defined(__x86_64) && defined(HAVE_PCLMULQDQ)
26
27 #include <sys/types.h>
28 #include <sys/simd.h>
29 #include <sys/asm_linkage.h>
30
31 /* These functions are used to execute pclmulqdq based assembly methods */
32 extern void ASMABI gcm_mul_pclmulqdq(uint64_t *, uint64_t *, uint64_t *);
33
34 #include <modes/gcm_impl.h>
35
36 /*
37 * Perform a carry-less multiplication (that is, use XOR instead of the
38 * multiply operator) on *x_in and *y and place the result in *res.
39 *
40 * Byte swap the input (*x_in and *y) and the output (*res).
41 *
42 * Note: x_in, y, and res all point to 16-byte numbers (an array of two
43 * 64-bit integers).
44 */
45 static void
gcm_pclmulqdq_mul(uint64_t * x_in,uint64_t * y,uint64_t * res)46 gcm_pclmulqdq_mul(uint64_t *x_in, uint64_t *y, uint64_t *res)
47 {
48 kfpu_begin();
49 gcm_mul_pclmulqdq(x_in, y, res);
50 kfpu_end();
51 }
52
53 static boolean_t
gcm_pclmulqdq_will_work(void)54 gcm_pclmulqdq_will_work(void)
55 {
56 return (kfpu_allowed() && zfs_pclmulqdq_available());
57 }
58
59 const gcm_impl_ops_t gcm_pclmulqdq_impl = {
60 .mul = &gcm_pclmulqdq_mul,
61 .is_supported = &gcm_pclmulqdq_will_work,
62 .name = "pclmulqdq"
63 };
64
65 #endif /* defined(__x86_64) && defined(HAVE_PCLMULQDQ) */
66