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 #include <linux/stddef.h>
  24
  25 /*
  26  * FP/SIMD storage area has:
  27  *  - FPSR and FPCR
  28  *  - 32 128-bit data registers
  29  *
  30  * Note that user_fpsimd forms a prefix of this structure, which is
  31  * relied upon in the ptrace FP/SIMD accessors.
  32  */
  33 struct fpsimd_state {
  34         union {
  35                 struct user_fpsimd_state user_fpsimd;
  36                 struct {
  37                         __uint128_t vregs[32];
  38                         u32 fpsr;
  39                         u32 fpcr;
  40                 };
  41         };
  42         /* the id of the last cpu to have restored this state */
  43         unsigned int cpu;
  44 };
  45
  46
  47 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  48 /* Masks for extracting the FPSR and FPCR from the FPSCR */
  49 #define VFP_FPSCR_STAT_MASK     0xf800009f
  50 #define VFP_FPSCR_CTRL_MASK     0x07f79f00
  51 /*
  52  * The VFP state has 32x64-bit registers and a single 32-bit
  53  * control/status register.
  54  */
  55 #define VFP_STATE_SIZE          ((32 * 8) + 4)
  56 #endif
  57
  58 struct task_struct;
  59
  60 extern void fpsimd_save_state(struct fpsimd_state *state);
  61 extern void fpsimd_load_state(struct fpsimd_state *state);
  62
  63 extern void fpsimd_thread_switch(struct task_struct *next);
  64 extern void fpsimd_flush_thread(void);
  65
  66 extern void fpsimd_preserve_current_state(void);
  67 extern void fpsimd_restore_current_state(void);
  68 extern void fpsimd_update_current_state(struct fpsimd_state *state);
  69
  70 extern void fpsimd_flush_task_state(struct task_struct *target);
  71
  72 extern void sve_save_state(void *state, u32 *pfpsr);
  73 extern void sve_load_state(void const *state, u32 const *pfpsr,
  74                            unsigned long vq_minus_1);
  75 extern unsigned int sve_get_vl(void);
  76
  77 #ifdef CONFIG_ARM64_SVE
  78
  79 extern size_t sve_state_size(struct task_struct const *task);
  80
  81 extern void sve_alloc(struct task_struct *task);
  82 extern void fpsimd_release_task(struct task_struct *task);
  83
  84 #else /* ! CONFIG_ARM64_SVE */
  85
  86 static inline void sve_alloc(struct task_struct *task) { }
  87 static inline void fpsimd_release_task(struct task_struct *task) { }
  88
  89 #endif /* ! CONFIG_ARM64_SVE */
  90
  91 /* For use by EFI runtime services calls only */
  92 extern void __efi_fpsimd_begin(void);
  93 extern void __efi_fpsimd_end(void);
  94
  95 #endif
  96
  97 #endif