FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/fpu.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      from: @(#)npx.h 5.3 (Berkeley) 1/18/91
     * $FreeBSD$
     */
    
    /*
     * Floating Point Data Structures and Constants
     * W. Jolitz 1/90
     */
    
    #ifndef _MACHINE_FPU_H_
    #define _MACHINE_FPU_H_
    
    #include <x86/fpu.h>
    
    #ifdef _KERNEL
    
    struct fpu_kern_ctx;
    
    #define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNFPU) == 0)
    
    #define XSAVE_AREA_ALIGN        64
    
    void    fpudna(void);
    void    fpudrop(void);
    void    fpuexit(struct thread *td);
    int     fpuformat(void);
    int     fpugetregs(struct thread *td);
    void    fpuinit(void);
    void    fpurestore(void *addr);
    void    fpuresume(void *addr);
    void    fpusave(void *addr);
    int     fpusetregs(struct thread *td, struct savefpu *addr,
                char *xfpustate, size_t xfpustate_size);
    int     fpusetxstate(struct thread *td, char *xfpustate,
                size_t xfpustate_size);
    void    fpususpend(void *addr);
    int     fputrap_sse(void);
    int     fputrap_x87(void);
    void    fpuuserinited(struct thread *td);
    struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int flags);
    struct fpu_kern_ctx *fpu_kern_alloc_ctx_domain(int domain, u_int flags);
    void    fpu_kern_free_ctx(struct fpu_kern_ctx *ctx);
    void    fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx,
                u_int flags);
    int     fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx);
    int     fpu_kern_thread(u_int flags);
    int     is_fpu_kern_thread(u_int flags);
    
    struct savefpu  *fpu_save_area_alloc(void);
    void    fpu_save_area_free(struct savefpu *fsa);
    void    fpu_save_area_reset(struct savefpu *fsa);
    
    /*
     * Flags for fpu_kern_alloc_ctx(), fpu_kern_enter() and fpu_kern_thread().
     */
    #define FPU_KERN_NORMAL 0x0000
    #define FPU_KERN_NOWAIT 0x0001
    #define FPU_KERN_KTHR   0x0002
    #define FPU_KERN_NOCTX  0x0004
    
    #endif
    
    #endif /* !_MACHINE_FPU_H_ */

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