LXR linux/arch/arm64/include/asm/fpsimd.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __ASM_FP_H
  17#define __ASM_FP_H
  18
  19#include <asm/ptrace.h>
  20
  21#ifndef __ASSEMBLY__
  22
  23/*
  24 * FP/SIMD storage area has:
  25 *  - FPSR and FPCR
  26 *  - 32 128-bit data registers
  27 *
  28 * Note that user_fpsimd forms a prefix of this structure, which is
  29 * relied upon in the ptrace FP/SIMD accessors.
  30 */
  31struct fpsimd_state {
  32        union {
  33                struct user_fpsimd_state user_fpsimd;
  34                struct {
  35                        __uint128_t vregs[32];
  36                        u32 fpsr;
  37                        u32 fpcr;
  38                };
  39        };
  40        /* the id of the last cpu to have restored this state */
  41        unsigned int cpu;
  42};
  43
  44/*
  45 * Struct for stacking the bottom 'n' FP/SIMD registers.
  46 */
  47struct fpsimd_partial_state {
  48        u32             fpsr;
  49        u32             fpcr;
  50        u32             num_regs;
  51        __uint128_t     vregs[32];
  52};
  53
  54
  55#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  56/* Masks for extracting the FPSR and FPCR from the FPSCR */
  57#define VFP_FPSCR_STAT_MASK     0xf800009f
  58#define VFP_FPSCR_CTRL_MASK     0x07f79f00
  59/*
  60 * The VFP state has 32x64-bit registers and a single 32-bit
  61 * control/status register.
  62 */
  63#define VFP_STATE_SIZE          ((32 * 8) + 4)
  64#endif
  65
  66struct task_struct;
  67
  68extern void fpsimd_save_state(struct fpsimd_state *state);
  69extern void fpsimd_load_state(struct fpsimd_state *state);
  70
  71extern void fpsimd_thread_switch(struct task_struct *next);
  72extern void fpsimd_flush_thread(void);
  73
  74extern void fpsimd_preserve_current_state(void);
  75extern void fpsimd_restore_current_state(void);
  76extern void fpsimd_update_current_state(struct fpsimd_state *state);
  77
  78extern void fpsimd_flush_task_state(struct task_struct *target);
  79
  80extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state,
  81                                      u32 num_regs);
  82extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state);
  83
  84#endif
  85
  86#endif
  87