FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/simd_x86.h

     /*
      * Copyright (c) 2020 iXsystems, Inc.
      * All rights reserved.
      *
      * 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 AUTHORS 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 AUTHORS 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.
     *
     * $FreeBSD$
     */
    
    #include <sys/types.h>
    #include <sys/cdefs.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    
    #include <machine/pcb.h>
    #include <x86/x86_var.h>
    #include <x86/specialreg.h>
    
    #define kfpu_init()             (0)
    #define kfpu_fini()             do {} while (0)
    #define kfpu_allowed()          1
    #define kfpu_initialize(tsk)    do {} while (0)
    
    #define kfpu_begin() {                                  \
            if (__predict_false(!is_fpu_kern_thread(0)))            \
                    fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX);\
    }
    
    #define kfpu_end()      {                       \
            if (__predict_false(curpcb->pcb_flags & PCB_FPUNOSAVE)) \
                    fpu_kern_leave(curthread, NULL);        \
    }
    
    /*
     * Check if OS supports AVX and AVX2 by checking XCR0
     * Only call this function if CPUID indicates that AVX feature is
     * supported by the CPU, otherwise it might be an illegal instruction.
     */
    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) != 0;
    
            if (!has_osxsave)
                    return (B_FALSE);
    
            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)
    
    
    /*
     * Check if SSE instruction set is available
     */
    static inline boolean_t
   zfs_sse_available(void)
   {
           return ((cpu_feature & CPUID_SSE) != 0);
   }
   
   /*
    * Check if SSE2 instruction set is available
    */
   static inline boolean_t
   zfs_sse2_available(void)
   {
           return ((cpu_feature & CPUID_SSE2) != 0);
   }
   
   /*
    * Check if SSE3 instruction set is available
    */
   static inline boolean_t
   zfs_sse3_available(void)
   {
           return ((cpu_feature2 & CPUID2_SSE3) != 0);
   }
   
   /*
    * Check if SSSE3 instruction set is available
    */
   static inline boolean_t
   zfs_ssse3_available(void)
   {
           return ((cpu_feature2 & CPUID2_SSSE3) != 0);
   }
   
   /*
    * Check if SSE4.1 instruction set is available
    */
   static inline boolean_t
   zfs_sse4_1_available(void)
   {
           return ((cpu_feature2 & CPUID2_SSE41) != 0);
   }
   
   /*
    * Check if SSE4.2 instruction set is available
    */
   static inline boolean_t
   zfs_sse4_2_available(void)
   {
           return ((cpu_feature2 & CPUID2_SSE42) != 0);
   }
   
   /*
    * Check if AVX instruction set is available
    */
   static inline boolean_t
   zfs_avx_available(void)
   {
           boolean_t has_avx;
   
           has_avx = (cpu_feature2 & CPUID2_AVX) != 0;
   
           return (has_avx && __ymm_enabled());
   }
   
   /*
    * Check if AVX2 instruction set is available
    */
   static inline boolean_t
   zfs_avx2_available(void)
   {
           boolean_t has_avx2;
   
           has_avx2 = (cpu_stdext_feature & CPUID_STDEXT_AVX2) != 0;
   
           return (has_avx2 && __ymm_enabled());
   }
   
   /*
    * AVX-512 family of instruction sets:
    *
    * AVX512F      Foundation
    * AVX512CD     Conflict Detection Instructions
    * AVX512ER     Exponential and Reciprocal Instructions
    * AVX512PF     Prefetch Instructions
    *
    * AVX512BW     Byte and Word Instructions
    * AVX512DQ     Double-word and Quadword Instructions
    * AVX512VL     Vector Length Extensions
    *
    * AVX512IFMA   Integer Fused Multiply Add (Not supported by kernel 4.4)
    * AVX512VBMI   Vector Byte Manipulation Instructions
    */
   
   
   /* Check if AVX512F instruction set is available */
   static inline boolean_t
   zfs_avx512f_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512CD instruction set is available */
   static inline boolean_t
   zfs_avx512cd_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512CD) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512ER instruction set is available */
   static inline boolean_t
   zfs_avx512er_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512CD) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512PF instruction set is available */
   static inline boolean_t
   zfs_avx512pf_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512PF) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512BW instruction set is available */
   static inline boolean_t
   zfs_avx512bw_available(void)
   {
           boolean_t has_avx512 = B_FALSE;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512BW) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512DQ instruction set is available */
   static inline boolean_t
   zfs_avx512dq_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512DQ) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512VL instruction set is available */
   static inline boolean_t
   zfs_avx512vl_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512VL) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512IFMA instruction set is available */
   static inline boolean_t
   zfs_avx512ifma_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_AVX512IFMA) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }
   
   /* Check if AVX512VBMI instruction set is available */
   static inline boolean_t
   zfs_avx512vbmi_available(void)
   {
           boolean_t has_avx512;
   
           has_avx512 = (cpu_stdext_feature & CPUID_STDEXT_AVX512F) != 0 &&
               (cpu_stdext_feature & CPUID_STDEXT_BMI1) != 0;
   
           return (has_avx512 && __zmm_enabled());
   }

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