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  */
  31 struct 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 };
  41
  42 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  43 /* Masks for extracting the FPSR and FPCR from the FPSCR */
  44 #define VFP_FPSCR_STAT_MASK     0xf800009f
  45 #define VFP_FPSCR_CTRL_MASK     0x07f79f00
  46 /*
  47  * The VFP state has 32x64-bit registers and a single 32-bit
  48  * control/status register.
  49  */
  50 #define VFP_STATE_SIZE          ((32 * 8) + 4)
  51 #endif
  52
  53 struct task_struct;
  54
  55 extern void fpsimd_save_state(struct fpsimd_state *state);
  56 extern void fpsimd_load_state(struct fpsimd_state *state);
  57
  58 extern void fpsimd_thread_switch(struct task_struct *next);
  59 extern void fpsimd_flush_thread(void);
  60
  61 #endif
  62
  63 #endif