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Linux/arch/arm64/include/asm/fpsimd.h

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  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
 87 

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