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 #include <asm/processor.h>
  22 #include <asm/sigcontext.h>
  23
  24 #ifndef __ASSEMBLY__
  25
  26 #include <linux/cache.h>
  27 #include <linux/init.h>
  28 #include <linux/stddef.h>
  29
  30 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  31 /* Masks for extracting the FPSR and FPCR from the FPSCR */
  32 #define VFP_FPSCR_STAT_MASK     0xf800009f
  33 #define VFP_FPSCR_CTRL_MASK     0x07f79f00
  34 /*
  35  * The VFP state has 32x64-bit registers and a single 32-bit
  36  * control/status register.
  37  */
  38 #define VFP_STATE_SIZE          ((32 * 8) + 4)
  39 #endif
  40
  41 struct task_struct;
  42
  43 extern void fpsimd_save_state(struct user_fpsimd_state *state);
  44 extern void fpsimd_load_state(struct user_fpsimd_state *state);
  45
  46 extern void fpsimd_save(void);
  47
  48 extern void fpsimd_thread_switch(struct task_struct *next);
  49 extern void fpsimd_flush_thread(void);
  50
  51 extern void fpsimd_signal_preserve_current_state(void);
  52 extern void fpsimd_preserve_current_state(void);
  53 extern void fpsimd_restore_current_state(void);
  54 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
  55
  56 extern void fpsimd_bind_task_to_cpu(void);
  57 extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state);
  58
  59 extern void fpsimd_flush_task_state(struct task_struct *target);
  60 extern void fpsimd_flush_cpu_state(void);
  61 extern void sve_flush_cpu_state(void);
  62
  63 /* Maximum VL that SVE VL-agnostic software can transparently support */
  64 #define SVE_VL_ARCH_MAX 0x100
  65
  66 /* Offset of FFR in the SVE register dump */
  67 static inline size_t sve_ffr_offset(int vl)
  68 {
  69         return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
  70 }
  71
  72 static inline void *sve_pffr(struct thread_struct *thread)
  73 {
  74         return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl);
  75 }
  76
  77 extern void sve_save_state(void *state, u32 *pfpsr);
  78 extern void sve_load_state(void const *state, u32 const *pfpsr,
  79                            unsigned long vq_minus_1);
  80 extern unsigned int sve_get_vl(void);
  81
  82 struct arm64_cpu_capabilities;
  83 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
  84
  85 extern u64 read_zcr_features(void);
  86
  87 extern int __ro_after_init sve_max_vl;
  88
  89 #ifdef CONFIG_ARM64_SVE
  90
  91 extern size_t sve_state_size(struct task_struct const *task);
  92
  93 extern void sve_alloc(struct task_struct *task);
  94 extern void fpsimd_release_task(struct task_struct *task);
  95 extern void fpsimd_sync_to_sve(struct task_struct *task);
  96 extern void sve_sync_to_fpsimd(struct task_struct *task);
  97 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
  98
  99 extern int sve_set_vector_length(struct task_struct *task,
 100                                  unsigned long vl, unsigned long flags);
 101
 102 extern int sve_set_current_vl(unsigned long arg);
 103 extern int sve_get_current_vl(void);
 104
 105 /*
 106  * Probing and setup functions.
 107  * Calls to these functions must be serialised with one another.
 108  */
 109 extern void __init sve_init_vq_map(void);
 110 extern void sve_update_vq_map(void);
 111 extern int sve_verify_vq_map(void);
 112 extern void __init sve_setup(void);
 113
 114 #else /* ! CONFIG_ARM64_SVE */
 115
 116 static inline void sve_alloc(struct task_struct *task) { }
 117 static inline void fpsimd_release_task(struct task_struct *task) { }
 118 static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
 119 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
 120
 121 static inline int sve_set_current_vl(unsigned long arg)
 122 {
 123         return -EINVAL;
 124 }
 125
 126 static inline int sve_get_current_vl(void)
 127 {
 128         return -EINVAL;
 129 }
 130
 131 static inline void sve_init_vq_map(void) { }
 132 static inline void sve_update_vq_map(void) { }
 133 static inline int sve_verify_vq_map(void) { return 0; }
 134 static inline void sve_setup(void) { }
 135
 136 #endif /* ! CONFIG_ARM64_SVE */
 137
 138 /* For use by EFI runtime services calls only */
 139 extern void __efi_fpsimd_begin(void);
 140 extern void __efi_fpsimd_end(void);
 141
 142 #endif
 143
 144 #endif