module/icp/algs/modes/gcm_pclmulqdq.c

   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
  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
  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) */