include/asm-arm/fpstate.h

   1 /*
   2  *  linux/include/asm-arm/fpstate.h
   3  *
   4  *  Copyright (C) 1995 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __ASM_ARM_FPSTATE_H
  12 #define __ASM_ARM_FPSTATE_H
  13
  14 #include <linux/config.h>
  15
  16 #ifndef __ASSEMBLY__
  17
  18 /*
  19  * VFP storage area has:
  20  *  - FPEXC, FPSCR, FPINST and FPINST2.
  21  *  - 16 double precision data registers
  22  *  - an implementation-dependant word of state for FLDMX/FSTMX
  23  *
  24  *  FPEXC will always be non-zero once the VFP has been used in this process.
  25  */
  26
  27 struct vfp_hard_struct {
  28         __u64 fpregs[16];
  29 #if __LINUX_ARM_ARCH__ < 6
  30         __u32 fpmx_state;
  31 #endif
  32         __u32 fpexc;
  33         __u32 fpscr;
  34         /*
  35          * VFP implementation specific state
  36          */
  37         __u32 fpinst;
  38         __u32 fpinst2;
  39 };
  40
  41 union vfp_state {
  42         struct vfp_hard_struct  hard;
  43 };
  44
  45 extern void vfp_flush_thread(union vfp_state *);
  46 extern void vfp_release_thread(union vfp_state *);
  47
  48 #define FP_HARD_SIZE 35
  49
  50 struct fp_hard_struct {
  51         unsigned int save[FP_HARD_SIZE];                /* as yet undefined */
  52 };
  53
  54 #define FP_SOFT_SIZE 35
  55
  56 struct fp_soft_struct {
  57         unsigned int save[FP_SOFT_SIZE];                /* undefined information */
  58 };
  59
  60 #define IWMMXT_SIZE     0x98
  61
  62 struct iwmmxt_struct {
  63         unsigned int save[IWMMXT_SIZE / sizeof(unsigned int)];
  64 };
  65
  66 union fp_state {
  67         struct fp_hard_struct   hard;
  68         struct fp_soft_struct   soft;
  69 #ifdef CONFIG_IWMMXT
  70         struct iwmmxt_struct    iwmmxt;
  71 #endif
  72 };
  73
  74 #define FP_SIZE (sizeof(union fp_state) / sizeof(int))
  75
  76 #endif
  77
  78 #endif