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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2019-2020 Rubicon Communications, LLC (Netgate)
 *
 * 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.
 *
 * $FreeBSD$
 */

#ifndef _SIMD_X86_64_H_
#define _SIMD_X86_64_H_ 


#include <x86/x86_var.h>
#include <x86/specialreg.h>

static inline uint64_t
xgetbv(uint32_t index)
{
	uint32_t eax, edx;
	/* xgetbv - instruction byte code */
	__asm__ __volatile__(".byte 0x0f; .byte 0x01; .byte 0xd0"
	    : "=a" (eax), "=d" (edx)
	    : "c" (index));

	return ((((uint64_t)edx)<<32) | (uint64_t)eax);
}


/*
 * Detect register set support
 */
static inline boolean_t
__simd_state_enabled(const uint64_t state)
{
	boolean_t has_osxsave;
	uint64_t xcr0;

	has_osxsave = !!(cpu_feature2 & CPUID2_OSXSAVE);

	if (!has_osxsave)
		return (0);

	xcr0 = xgetbv(0);
	return ((xcr0 & state) == state);
}

#define	_XSTATE_SSE_AVX		(0x2 | 0x4)
#define	_XSTATE_AVX512		(0xE0 | _XSTATE_SSE_AVX)

#define	__ymm_enabled() __simd_state_enabled(_XSTATE_SSE_AVX)
#define	__zmm_enabled() __simd_state_enabled(_XSTATE_AVX512)
#endif