FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/src/linux_fpu.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      * 
      * Copyright (c) 2020 Val Packett <val@packett.cool>
      *
      * 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.
     */
    
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/kernel.h>
    
    #include <linux/sched.h>
    
    #include <asm/fpu/api.h>
    
    #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
    
    #include <machine/fpu.h>
    
    /*
     * Technically the Linux API isn't supposed to allow nesting sections
     * either, but currently used versions of GPU drivers rely on nesting
     * working, so we only enter the section on the outermost level.
     */
    
    void
    lkpi_kernel_fpu_begin(void)
    {
            if ((current->fpu_ctx_level)++ == 0)
                    fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX);
    }
    
    void
    lkpi_kernel_fpu_end(void)
    {
            if (--(current->fpu_ctx_level) == 0)
                    fpu_kern_leave(curthread, NULL);
    }
    
    #else
    
    void
    lkpi_kernel_fpu_begin(void)
    {
    }
    
    void
    lkpi_kernel_fpu_end(void)
    {
    }
    
    #endif

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