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_fp forms a prefix of this structure, which is relied
  29  * upon in the ptrace FP/SIMD accessors. struct user_fpsimd_state must
  30  * form a prefix of struct fpsimd_state.
  31  */
  32 struct fpsimd_state {
  33         union {
  34                 struct user_fpsimd_state user_fpsimd;
  35                 struct {
  36                         __uint128_t vregs[32];
  37                         u32 fpsr;
  38                         u32 fpcr;
  39                 };
  40         };
  41 };
  42
  43 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  44 /* Masks for extracting the FPSR and FPCR from the FPSCR */
  45 #define VFP_FPSCR_STAT_MASK     0xf800009f
  46 #define VFP_FPSCR_CTRL_MASK     0x07f79f00
  47 /*
  48  * The VFP state has 32x64-bit registers and a single 32-bit
  49  * control/status register.
  50  */
  51 #define VFP_STATE_SIZE          ((32 * 8) + 4)
  52 #endif
  53
  54 struct task_struct;
  55
  56 extern void fpsimd_save_state(struct fpsimd_state *state);
  57 extern void fpsimd_load_state(struct fpsimd_state *state);
  58
  59 extern void fpsimd_thread_switch(struct task_struct *next);
  60 extern void fpsimd_flush_thread(void);
  61
  62 #endif
  63
  64 #endif