1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 #ifndef __ASM_FP_H 6 #define __ASM_FP_H 7 8 #include <asm/errno.h> 9 #include <asm/ptrace.h> 10 #include <asm/processor.h> 11 #include <asm/sigcontext.h> 12 #include <asm/sysreg.h> 13 14 #ifndef __ASSEMBLY__ 15 16 #include <linux/bitmap.h> 17 #include <linux/build_bug.h> 18 #include <linux/bug.h> 19 #include <linux/cache.h> 20 #include <linux/init.h> 21 #include <linux/stddef.h> 22 #include <linux/types.h> 23 24 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 25 /* Masks for extracting the FPSR and FPCR from the FPSCR */ 26 #define VFP_FPSCR_STAT_MASK 0xf800009f 27 #define VFP_FPSCR_CTRL_MASK 0x07f79f00 28 /* 29 * The VFP state has 32x64-bit registers and a single 32-bit 30 * control/status register. 31 */ 32 #define VFP_STATE_SIZE ((32 * 8) + 4) 33 #endif 34 35 struct task_struct; 36 37 extern void fpsimd_save_state(struct user_fpsimd_state *state); 38 extern void fpsimd_load_state(struct user_fpsimd_state *state); 39 40 extern void fpsimd_thread_switch(struct task_struct *next); 41 extern void fpsimd_flush_thread(void); 42 43 extern void fpsimd_signal_preserve_current_state(void); 44 extern void fpsimd_preserve_current_state(void); 45 extern void fpsimd_restore_current_state(void); 46 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state); 47 48 extern void fpsimd_bind_task_to_cpu(void); 49 extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state, 50 void *sve_state, unsigned int sve_vl); 51 52 extern void fpsimd_flush_task_state(struct task_struct *target); 53 extern void fpsimd_save_and_flush_cpu_state(void); 54 55 /* Maximum VL that SVE VL-agnostic software can transparently support */ 56 #define SVE_VL_ARCH_MAX 0x100 57 58 /* Offset of FFR in the SVE register dump */ 59 static inline size_t sve_ffr_offset(int vl) 60 { 61 return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET; 62 } 63 64 static inline void *sve_pffr(struct thread_struct *thread) 65 { 66 return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl); 67 } 68 69 extern void sve_save_state(void *state, u32 *pfpsr); 70 extern void sve_load_state(void const *state, u32 const *pfpsr, 71 unsigned long vq_minus_1); 72 extern unsigned int sve_get_vl(void); 73 74 struct arm64_cpu_capabilities; 75 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused); 76 77 extern u64 read_zcr_features(void); 78 79 extern int __ro_after_init sve_max_vl; 80 extern int __ro_after_init sve_max_virtualisable_vl; 81 extern __ro_after_init DECLARE_BITMAP(sve_vq_map, SVE_VQ_MAX); 82 83 /* 84 * Helpers to translate bit indices in sve_vq_map to VQ values (and 85 * vice versa). This allows find_next_bit() to be used to find the 86 * _maximum_ VQ not exceeding a certain value. 87 */ 88 static inline unsigned int __vq_to_bit(unsigned int vq) 89 { 90 return SVE_VQ_MAX - vq; 91 } 92 93 static inline unsigned int __bit_to_vq(unsigned int bit) 94 { 95 return SVE_VQ_MAX - bit; 96 } 97 98 /* Ensure vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX before calling this function */ 99 static inline bool sve_vq_available(unsigned int vq) 100 { 101 return test_bit(__vq_to_bit(vq), sve_vq_map); 102 } 103 104 #ifdef CONFIG_ARM64_SVE 105 106 extern size_t sve_state_size(struct task_struct const *task); 107 108 extern void sve_alloc(struct task_struct *task); 109 extern void fpsimd_release_task(struct task_struct *task); 110 extern void fpsimd_sync_to_sve(struct task_struct *task); 111 extern void sve_sync_to_fpsimd(struct task_struct *task); 112 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task); 113 114 extern int sve_set_vector_length(struct task_struct *task, 115 unsigned long vl, unsigned long flags); 116 117 extern int sve_set_current_vl(unsigned long arg); 118 extern int sve_get_current_vl(void); 119 120 static inline void sve_user_disable(void) 121 { 122 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0); 123 } 124 125 static inline void sve_user_enable(void) 126 { 127 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN); 128 } 129 130 /* 131 * Probing and setup functions. 132 * Calls to these functions must be serialised with one another. 133 */ 134 extern void __init sve_init_vq_map(void); 135 extern void sve_update_vq_map(void); 136 extern int sve_verify_vq_map(void); 137 extern void __init sve_setup(void); 138 139 #else /* ! CONFIG_ARM64_SVE */ 140 141 static inline void sve_alloc(struct task_struct *task) { } 142 static inline void fpsimd_release_task(struct task_struct *task) { } 143 static inline void sve_sync_to_fpsimd(struct task_struct *task) { } 144 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { } 145 146 static inline int sve_set_current_vl(unsigned long arg) 147 { 148 return -EINVAL; 149 } 150 151 static inline int sve_get_current_vl(void) 152 { 153 return -EINVAL; 154 } 155 156 static inline void sve_user_disable(void) { BUILD_BUG(); } 157 static inline void sve_user_enable(void) { BUILD_BUG(); } 158 159 static inline void sve_init_vq_map(void) { } 160 static inline void sve_update_vq_map(void) { } 161 static inline int sve_verify_vq_map(void) { return 0; } 162 static inline void sve_setup(void) { } 163 164 #endif /* ! CONFIG_ARM64_SVE */ 165 166 /* For use by EFI runtime services calls only */ 167 extern void __efi_fpsimd_begin(void); 168 extern void __efi_fpsimd_end(void); 169 170 #endif 171 172 #endif 173