FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/vfp.h

     /*-
      * Copyright (c) 2015 The FreeBSD Foundation
      *
      * This software was developed by Andrew Turner under
      * sponsorship from the FreeBSD Foundation.
      *
      * 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 _MACHINE_VFP_H_
    #define _MACHINE_VFP_H_
    
    /* VFPCR */
    #define VFPCR_AHP               (0x04000000)    /* alt. half-precision: */
    #define VFPCR_DN                (0x02000000)    /* default NaN enable */
    #define VFPCR_FZ                (0x01000000)    /* flush to zero enabled */
    #define VFPCR_INIT              0               /* Default fpcr after exec */
    
    #define VFPCR_RMODE_OFF         22              /* rounding mode offset */
    #define VFPCR_RMODE_MASK        (0x00c00000)    /* rounding mode mask */
    #define VFPCR_RMODE_RN          (0x00000000)    /* round nearest */
    #define VFPCR_RMODE_RPI         (0x00400000)    /* round to plus infinity */
    #define VFPCR_RMODE_RNI         (0x00800000)    /* round to neg infinity */
    #define VFPCR_RMODE_RM          (0x00c00000)    /* round to zero */
    
    #define VFPCR_STRIDE_OFF        20              /* vector stride -1 */
    #define VFPCR_STRIDE_MASK       (0x00300000)
    #define VFPCR_LEN_OFF           16              /* vector length -1 */
    #define VFPCR_LEN_MASK          (0x00070000)
    #define VFPCR_IDE               (0x00008000)    /* input subnormal exc enable */
    #define VFPCR_IXE               (0x00001000)    /* inexact exception enable */
    #define VFPCR_UFE               (0x00000800)    /* underflow exception enable */
    #define VFPCR_OFE               (0x00000400)    /* overflow exception enable */
    #define VFPCR_DZE               (0x00000200)    /* div by zero exception en */
    #define VFPCR_IOE               (0x00000100)    /* invalid op exec enable */
    
    #ifndef LOCORE
    struct vfpstate {
            __uint128_t     vfp_regs[32];
            uint32_t        vfp_fpcr;
            uint32_t        vfp_fpsr;
    };
    
    #ifdef _KERNEL
    struct pcb;
    struct thread;
    
    void    vfp_init(void);
    void    vfp_discard(struct thread *);
    void    vfp_new_thread(struct thread *, struct thread *, bool);
    void    vfp_reset_state(struct thread *, struct pcb *);
    void    vfp_restore_state(void);
    void    vfp_save_state(struct thread *, struct pcb *);
    
    struct fpu_kern_ctx;
    
    /*
     * 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
    
    struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int);
    void fpu_kern_free_ctx(struct fpu_kern_ctx *);
    void fpu_kern_enter(struct thread *, struct fpu_kern_ctx *, u_int);
    int fpu_kern_leave(struct thread *, struct fpu_kern_ctx *);
    int fpu_kern_thread(u_int);
    int is_fpu_kern_thread(u_int);
    
    /* Convert to and from Aarch32 FPSCR to Aarch64 FPCR/FPSR */
    #define VFP_FPSCR_FROM_SRCR(vpsr, vpcr) ((vpsr) | ((vpcr) & 0x7c00000))
    #define VFP_FPSR_FROM_FPSCR(vpscr) ((vpscr) &~ 0x7c00000)
    #define VFP_FPCR_FROM_FPSCR(vpsrc) ((vpsrc) & 0x7c00000)
    
    #ifdef COMPAT_FREEBSD32
    void get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp);
   void set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp);
   #endif
   
   #endif
   
   #endif
   
   #endif /* !_MACHINE_VFP_H_ */

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