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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Joyent, Inc.
*/
#ifndef _SIMD_H
#define _SIMD_H
#if defined(__amd64__) || defined(__i386__)
#define kfpu_initialize(tsk) do {} while (0)
#define kfpu_init() (0)
#define kfpu_fini() do {} while (0)
#ifdef _KERNEL
#include <sys/x86_archext.h>
#include <sys/archsystm.h>
#include <sys/kfpu.h>
#include <sys/proc.h>
#include <sys/disp.h>
#include <sys/cpuvar.h>
static inline int
kfpu_allowed(void)
{
extern int zfs_fpu_enabled;
return (zfs_fpu_enabled != 0 ? 1 : 0);
}
static inline void
kfpu_begin(void)
{
if (curthread->t_lwp != NULL && (curthread->t_procp->p_flag & SSYS)) {
kernel_fpu_begin(NULL, KFPU_USE_LWP);
} else {
kpreempt_disable();
kernel_fpu_begin(NULL, KFPU_NO_STATE);
}
}
static inline void
kfpu_end(void)
{
if (curthread->t_lwp != NULL && (curthread->t_procp->p_flag & SSYS)) {
kernel_fpu_end(NULL, KFPU_USE_LWP);
} else {
kernel_fpu_end(NULL, KFPU_NO_STATE);
kpreempt_enable();
}
}
/*
* Check if various vector instruction sets are available.
*/
static inline boolean_t
zfs_sse_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_SSE));
}
static inline boolean_t
zfs_sse2_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_SSE2));
}
static inline boolean_t
zfs_sse3_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_SSE3));
}
static inline boolean_t
zfs_ssse3_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_SSSE3));
}
static inline boolean_t
zfs_avx_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_AVX));
}
static inline boolean_t
zfs_avx2_available(void)
{
return (is_x86_feature(x86_featureset, X86FSET_AVX2));
}
#else /* ! _KERNEL */
#include <sys/auxv.h>
#include <sys/auxv_386.h>
#define kfpu_allowed() 1
#define kfpu_begin() do {} while (0)
#define kfpu_end() do {} while (0)
/*
* User-level check if various vector instruction sets are available.
*/
static inline boolean_t
zfs_sse_available(void)
{
uint32_t u = 0;
(void) getisax(&u, 1);
return ((u & AV_386_SSE) != 0);
}
static inline boolean_t
zfs_sse2_available(void)
{
uint32_t u = 0;
(void) getisax(&u, 1);
return ((u & AV_386_SSE2) != 0);
}
static inline boolean_t
zfs_sse3_available(void)
{
uint32_t u = 0;
(void) getisax(&u, 1);
return ((u & AV_386_SSE3) != 0);
}
static inline boolean_t
zfs_ssse3_available(void)
{
uint32_t u = 0;
(void) getisax(&u, 1);
return ((u & AV_386_SSSE3) != 0);
}
static inline boolean_t
zfs_avx_available(void)
{
uint_t u = 0;
(void) getisax(&u, 1);
return ((u & AV_386_AVX) != 0);
}
static inline boolean_t
zfs_avx2_available(void)
{
uint32_t u[2] = { 0 };
(void) getisax((uint32_t *)&u, 2);
return ((u[1] & AV_386_2_AVX2) != 0);
}
#endif /* _KERNEL */
#else
/* Non-x86 CPUs currently always disallow kernel FPU support */
#define kfpu_allowed() 0
#define kfpu_initialize(tsk) do {} while (0)
#define kfpu_begin() do {} while (0)
#define kfpu_end() do {} while (0)
#define kfpu_init() (0)
#define kfpu_fini() do {} while (0)
#endif
#endif /* _SIMD_H */
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