sys/arm64/include/vfp.h

   1 /*-
   2  * Copyright (c) 2015 The FreeBSD Foundation
   3  *
   4  * This software was developed by Andrew Turner under
   5  * sponsorship from the FreeBSD Foundation.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifdef __arm__
  30 #include <arm/vfp.h>
  31 #else /* !__arm__ */
  32
  33 #ifndef _MACHINE_VFP_H_
  34 #define _MACHINE_VFP_H_
  35
  36 /* VFPCR */
  37 #define VFPCR_AHP               (0x04000000)    /* alt. half-precision: */
  38 #define VFPCR_DN                (0x02000000)    /* default NaN enable */
  39 #define VFPCR_FZ                (0x01000000)    /* flush to zero enabled */
  40 #define VFPCR_INIT              0               /* Default fpcr after exec */
  41
  42 #define VFPCR_RMODE_OFF         22              /* rounding mode offset */
  43 #define VFPCR_RMODE_MASK        (0x00c00000)    /* rounding mode mask */
  44 #define VFPCR_RMODE_RN          (0x00000000)    /* round nearest */
  45 #define VFPCR_RMODE_RPI         (0x00400000)    /* round to plus infinity */
  46 #define VFPCR_RMODE_RNI         (0x00800000)    /* round to neg infinity */
  47 #define VFPCR_RMODE_RM          (0x00c00000)    /* round to zero */
  48
  49 #define VFPCR_STRIDE_OFF        20              /* vector stride -1 */
  50 #define VFPCR_STRIDE_MASK       (0x00300000)
  51 #define VFPCR_LEN_OFF           16              /* vector length -1 */
  52 #define VFPCR_LEN_MASK          (0x00070000)
  53 #define VFPCR_IDE               (0x00008000)    /* input subnormal exc enable */
  54 #define VFPCR_IXE               (0x00001000)    /* inexact exception enable */
  55 #define VFPCR_UFE               (0x00000800)    /* underflow exception enable */
  56 #define VFPCR_OFE               (0x00000400)    /* overflow exception enable */
  57 #define VFPCR_DZE               (0x00000200)    /* div by zero exception en */
  58 #define VFPCR_IOE               (0x00000100)    /* invalid op exec enable */
  59
  60 #ifndef LOCORE
  61 struct vfpstate {
  62         __uint128_t     vfp_regs[32];
  63         uint32_t        vfp_fpcr;
  64         uint32_t        vfp_fpsr;
  65 };
  66
  67 #ifdef _KERNEL
  68 struct pcb;
  69 struct thread;
  70
  71 void    vfp_init_secondary(void);
  72 void    vfp_enable(void);
  73 void    vfp_disable(void);
  74 void    vfp_discard(struct thread *);
  75 void    vfp_store(struct vfpstate *);
  76 void    vfp_restore(struct vfpstate *);
  77 void    vfp_new_thread(struct thread *, struct thread *, bool);
  78 void    vfp_reset_state(struct thread *, struct pcb *);
  79 void    vfp_restore_state(void);
  80 void    vfp_save_state(struct thread *, struct pcb *);
  81 void    vfp_save_state_savectx(struct pcb *);
  82 void    vfp_save_state_switch(struct thread *);
  83 void    vfp_to_sve_sync(struct thread *);
  84 void    sve_to_vfp_sync(struct thread *);
  85
  86 size_t  sve_max_buf_size(void);
  87 size_t  sve_buf_size(struct thread *);
  88 bool    sve_restore_state(struct thread *);
  89
  90 struct fpu_kern_ctx;
  91
  92 /*
  93  * Flags for fpu_kern_alloc_ctx(), fpu_kern_enter() and fpu_kern_thread().
  94  */
  95 #define FPU_KERN_NORMAL 0x0000
  96 #define FPU_KERN_NOWAIT 0x0001
  97 #define FPU_KERN_KTHR   0x0002
  98 #define FPU_KERN_NOCTX  0x0004
  99
 100 struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int);
 101 void fpu_kern_free_ctx(struct fpu_kern_ctx *);
 102 void fpu_kern_enter(struct thread *, struct fpu_kern_ctx *, u_int);
 103 int fpu_kern_leave(struct thread *, struct fpu_kern_ctx *);
 104 int fpu_kern_thread(u_int);
 105 int is_fpu_kern_thread(u_int);
 106
 107 struct vfpstate *fpu_save_area_alloc(void);
 108 void fpu_save_area_free(struct vfpstate *fsa);
 109 void fpu_save_area_reset(struct vfpstate *fsa);
 110
 111 /* Convert to and from Aarch32 FPSCR to Aarch64 FPCR/FPSR */
 112 #define VFP_FPSCR_FROM_SRCR(vpsr, vpcr) ((vpsr) | ((vpcr) & 0x7c00000))
 113 #define VFP_FPSR_FROM_FPSCR(vpscr) ((vpscr) &~ 0x7c00000)
 114 #define VFP_FPCR_FROM_FPSCR(vpsrc) ((vpsrc) & 0x7c00000)
 115
 116 #ifdef COMPAT_FREEBSD32
 117 void get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp);
 118 void set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp);
 119 #endif
 120
 121 #endif
 122
 123 #endif
 124
 125 #endif /* !_MACHINE_VFP_H_ */
 126
 127 #endif /* !__arm__ */