diff options
Diffstat (limited to 'lib/libc/aarch64/string/memset_resolver.c')
| -rw-r--r-- | lib/libc/aarch64/string/memset_resolver.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/libc/aarch64/string/memset_resolver.c b/lib/libc/aarch64/string/memset_resolver.c new file mode 100644 index 000000000000..277e8c177de9 --- /dev/null +++ b/lib/libc/aarch64/string/memset_resolver.c @@ -0,0 +1,55 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2026 Arm Ltd + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/types.h> + +#include <machine/armreg.h> +#include <machine/ifunc.h> + +#include <elf.h> + +void *__memset_aarch64(void *, int, size_t); +void *__memset_aarch64_zva64(void *, int, size_t); +void *__memset_aarch64_mops(void *, int, size_t); + +DEFINE_UIFUNC(, void *, memset, (void *, int, size_t)) +{ + uint64_t dczid; + + if (ifunc_arg->_hwcap2 & HWCAP2_MOPS) + return (__memset_aarch64_mops); + + /* + * Check for the DC ZVA instruction, and it will + * zero 64 bytes (4 * 4byte words). + */ + dczid = READ_SPECIALREG(dczid_el0); + if ((dczid & DCZID_DZP) == 0 && DCZID_BS_SIZE(dczid) == 4) + return (__memset_aarch64_zva64); + + return (__memset_aarch64); +} + |