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 #include <asm/errno.h>
  21
  22 #ifndef __ASSEMBLY__
  23
  24 #include <linux/cache.h>
  25 #include <linux/stddef.h>
  26
  27 /*
  28  * FP/SIMD storage area has:
  29  *  - FPSR and FPCR
  30  *  - 32 128-bit data registers
  31  *
  32  * Note that user_fpsimd forms a prefix of this structure, which is
  33  * relied upon in the ptrace FP/SIMD accessors.
  34  */
  35 struct fpsimd_state {
  36         union {
  37                 struct user_fpsimd_state user_fpsimd;
  38                 struct {
  39                         __uint128_t vregs[32];
  40                         u32 fpsr;
  41                         u32 fpcr;
  42                         /*
  43                          * For ptrace compatibility, pad to next 128-bit
  44                          * boundary here if extending this struct.
  45                          */
  46                 };
  47         };
  48         /* the id of the last cpu to have restored this state */
  49         unsigned int cpu;
  50 };
  51
  52 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  53 /* Masks for extracting the FPSR and FPCR from the FPSCR */
  54 #define VFP_FPSCR_STAT_MASK     0xf800009f
  55 #define VFP_FPSCR_CTRL_MASK     0x07f79f00
  56 /*
  57  * The VFP state has 32x64-bit registers and a single 32-bit
  58  * control/status register.
  59  */
  60 #define VFP_STATE_SIZE          ((32 * 8) + 4)
  61 #endif
  62
  63 struct task_struct;
  64
  65 extern void fpsimd_save_state(struct fpsimd_state *state);
  66 extern void fpsimd_load_state(struct fpsimd_state *state);
  67
  68 extern void fpsimd_thread_switch(struct task_struct *next);
  69 extern void fpsimd_flush_thread(void);
  70
  71 extern void fpsimd_signal_preserve_current_state(void);
  72 extern void fpsimd_preserve_current_state(void);
  73 extern void fpsimd_restore_current_state(void);
  74 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
  75
  76 extern void fpsimd_flush_task_state(struct task_struct *target);
  77 extern void sve_flush_cpu_state(void);
  78
  79 /* Maximum VL that SVE VL-agnostic software can transparently support */
  80 #define SVE_VL_ARCH_MAX 0x100
  81
  82 extern void sve_save_state(void *state, u32 *pfpsr);
  83 extern void sve_load_state(void const *state, u32 const *pfpsr,
  84                            unsigned long vq_minus_1);
  85 extern unsigned int sve_get_vl(void);
  86 extern int sve_kernel_enable(void *);
  87
  88 extern int __ro_after_init sve_max_vl;
  89
  90 #ifdef CONFIG_ARM64_SVE
  91
  92 extern size_t sve_state_size(struct task_struct const *task);
  93
  94 extern void sve_alloc(struct task_struct *task);
  95 extern void fpsimd_release_task(struct task_struct *task);
  96 extern void fpsimd_sync_to_sve(struct task_struct *task);
  97 extern void sve_sync_to_fpsimd(struct task_struct *task);
  98 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
  99
 100 extern int sve_set_vector_length(struct task_struct *task,
 101                                  unsigned long vl, unsigned long flags);
 102
 103 extern int sve_set_current_vl(unsigned long arg);
 104 extern int sve_get_current_vl(void);
 105
 106 /*
 107  * Probing and setup functions.
 108  * Calls to these functions must be serialised with one another.
 109  */
 110 extern void __init sve_init_vq_map(void);
 111 extern void sve_update_vq_map(void);
 112 extern int sve_verify_vq_map(void);
 113 extern void __init sve_setup(void);
 114
 115 #else /* ! CONFIG_ARM64_SVE */
 116
 117 static inline void sve_alloc(struct task_struct *task) { }
 118 static inline void fpsimd_release_task(struct task_struct *task) { }
 119 static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
 120 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
 121
 122 static inline int sve_set_current_vl(unsigned long arg)
 123 {
 124         return -EINVAL;
 125 }
 126
 127 static inline int sve_get_current_vl(void)
 128 {
 129         return -EINVAL;
 130 }
 131
 132 static inline void sve_init_vq_map(void) { }
 133 static inline void sve_update_vq_map(void) { }
 134 static inline int sve_verify_vq_map(void) { return 0; }
 135 static inline void sve_setup(void) { }
 136
 137 #endif /* ! CONFIG_ARM64_SVE */
 138
 139 /* For use by EFI runtime services calls only */
 140 extern void __efi_fpsimd_begin(void);
 141 extern void __efi_fpsimd_end(void);
 142
 143 #endif
 144
 145 #endif