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         /* 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  */
  47 struct 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
  66 struct task_struct;
  67
  68 extern void fpsimd_save_state(struct fpsimd_state *state);
  69 extern void fpsimd_load_state(struct fpsimd_state *state);
  70
  71 extern void fpsimd_thread_switch(struct task_struct *next);
  72 extern void fpsimd_flush_thread(void);
  73
  74 extern void fpsimd_preserve_current_state(void);
  75 extern void fpsimd_restore_current_state(void);
  76 extern void fpsimd_update_current_state(struct fpsimd_state *state);
  77
  78 extern void fpsimd_flush_task_state(struct task_struct *target);
  79
  80 extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state,
  81                                       u32 num_regs);
  82 extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state);
  83
  84 #endif
  85
  86 #endif