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// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
*/
/*
* USER API:
*
* Kernel fpu methods:
* kfpu_allowed()
* kfpu_begin()
* kfpu_end()
* kfpu_init()
* kfpu_fini()
*
* SIMD support:
*
* Following functions should be called to determine whether CPU feature
* is supported. All functions are usable in kernel and user space.
* If a SIMD algorithm is using more than one instruction set
* all relevant feature test functions should be called.
*
* Supported features:
* zfs_neon_available()
* zfs_sha256_available()
*/
#ifndef _LINUX_SIMD_ARM_H
#define _LINUX_SIMD_ARM_H
#include <sys/types.h>
#include <asm/neon.h>
#include <asm/elf.h>
#include <asm/hwcap.h>
#if (defined(HAVE_KERNEL_NEON) && defined(CONFIG_KERNEL_MODE_NEON))
#define kfpu_allowed() 1
#define kfpu_begin() kernel_neon_begin()
#define kfpu_end() kernel_neon_end()
#else
#define kfpu_allowed() 0
#define kfpu_begin() do {} while (0)
#define kfpu_end() do {} while (0)
#endif
#define kfpu_init() (0)
#define kfpu_fini() do {} while (0)
/*
* Check if NEON is available
*/
static inline boolean_t
zfs_neon_available(void)
{
return (elf_hwcap & HWCAP_NEON);
}
/*
* Check if SHA256 is available
*/
static inline boolean_t
zfs_sha256_available(void)
{
return (elf_hwcap2 & HWCAP2_SHA2);
}
#endif /* _LINUX_SIMD_ARM_H */
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