1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2026 Arm Ltd 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 #include <sys/types.h> 28 29 #include <machine/armreg.h> 30 #include <machine/ifunc.h> 31 32 #include <elf.h> 33 34 void *__memset_aarch64(void *, int, size_t); 35 void *__memset_aarch64_zva64(void *, int, size_t); 36 void *__memset_aarch64_mops(void *, int, size_t); 37 38 DEFINE_UIFUNC(, void *, memset, (void *, int, size_t)) 39 { 40 uint64_t dczid; 41 42 if (ifunc_arg->_hwcap2 & HWCAP2_MOPS) 43 return (__memset_aarch64_mops); 44 45 /* 46 * Check for the DC ZVA instruction, and it will 47 * zero 64 bytes (4 * 4byte words). 48 */ 49 dczid = READ_SPECIALREG(dczid_el0); 50 if ((dczid & DCZID_DZP) == 0 && DCZID_BS_SIZE(dczid) == 4) 51 return (__memset_aarch64_zva64); 52 53 return (__memset_aarch64); 54 } 55 56