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/errno.h> 20 #include <asm/ptrace.h> 21 #include <asm/processor.h> 22 #include <asm/sigcontext.h> 23 #include <asm/sysreg.h> 24 25 #ifndef __ASSEMBLY__ 26 27 #include <linux/bitmap.h> 28 #include <linux/build_bug.h> 29 #include <linux/bug.h> 30 #include <linux/cache.h> 31 #include <linux/init.h> 32 #include <linux/stddef.h> 33 #include <linux/types.h> 34 35 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 36 /* Masks for extracting the FPSR and FPCR from the FPSCR */ 37 #define VFP_FPSCR_STAT_MASK 0xf800009f 38 #define VFP_FPSCR_CTRL_MASK 0x07f79f00 39 /* 40 * The VFP state has 32x64-bit registers and a single 32-bit 41 * control/status register. 42 */ 43 #define VFP_STATE_SIZE ((32 * 8) + 4) 44 #endif 45 46 struct task_struct; 47 48 extern void fpsimd_save_state(struct user_fpsimd_state *state); 49 extern void fpsimd_load_state(struct user_fpsimd_state *state); 50 51 extern void fpsimd_save(void); 52 53 extern void fpsimd_thread_switch(struct task_struct *next); 54 extern void fpsimd_flush_thread(void); 55 56 extern void fpsimd_signal_preserve_current_state(void); 57 extern void fpsimd_preserve_current_state(void); 58 extern void fpsimd_restore_current_state(void); 59 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state); 60 61 extern void fpsimd_bind_task_to_cpu(void); 62 extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state, 63 void *sve_state, unsigned int sve_vl); 64 65 extern void fpsimd_flush_task_state(struct task_struct *target); 66 extern void fpsimd_flush_cpu_state(void); 67 extern void sve_flush_cpu_state(void); 68 69 /* Maximum VL that SVE VL-agnostic software can transparently support */ 70 #define SVE_VL_ARCH_MAX 0x100 71 72 /* Offset of FFR in the SVE register dump */ 73 static inline size_t sve_ffr_offset(int vl) 74 { 75 return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET; 76 } 77 78 static inline void *sve_pffr(struct thread_struct *thread) 79 { 80 return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl); 81 } 82 83 extern void sve_save_state(void *state, u32 *pfpsr); 84 extern void sve_load_state(void const *state, u32 const *pfpsr, 85 unsigned long vq_minus_1); 86 extern unsigned int sve_get_vl(void); 87 88 struct arm64_cpu_capabilities; 89 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused); 90 91 extern u64 read_zcr_features(void); 92 93 extern int __ro_after_init sve_max_vl; 94 extern int __ro_after_init sve_max_virtualisable_vl; 95 extern __ro_after_init DECLARE_BITMAP(sve_vq_map, SVE_VQ_MAX); 96 97 /* 98 * Helpers to translate bit indices in sve_vq_map to VQ values (and 99 * vice versa). This allows find_next_bit() to be used to find the 100 * _maximum_ VQ not exceeding a certain value. 101 */ 102 static inline unsigned int __vq_to_bit(unsigned int vq) 103 { 104 return SVE_VQ_MAX - vq; 105 } 106 107 static inline unsigned int __bit_to_vq(unsigned int bit) 108 { 109 return SVE_VQ_MAX - bit; 110 } 111 112 /* Ensure vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX before calling this function */ 113 static inline bool sve_vq_available(unsigned int vq) 114 { 115 return test_bit(__vq_to_bit(vq), sve_vq_map); 116 } 117 118 #ifdef CONFIG_ARM64_SVE 119 120 extern size_t sve_state_size(struct task_struct const *task); 121 122 extern void sve_alloc(struct task_struct *task); 123 extern void fpsimd_release_task(struct task_struct *task); 124 extern void fpsimd_sync_to_sve(struct task_struct *task); 125 extern void sve_sync_to_fpsimd(struct task_struct *task); 126 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task); 127 128 extern int sve_set_vector_length(struct task_struct *task, 129 unsigned long vl, unsigned long flags); 130 131 extern int sve_set_current_vl(unsigned long arg); 132 extern int sve_get_current_vl(void); 133 134 static inline void sve_user_disable(void) 135 { 136 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0); 137 } 138 139 static inline void sve_user_enable(void) 140 { 141 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN); 142 } 143 144 /* 145 * Probing and setup functions. 146 * Calls to these functions must be serialised with one another. 147 */ 148 extern void __init sve_init_vq_map(void); 149 extern void sve_update_vq_map(void); 150 extern int sve_verify_vq_map(void); 151 extern void __init sve_setup(void); 152 153 #else /* ! CONFIG_ARM64_SVE */ 154 155 static inline void sve_alloc(struct task_struct *task) { } 156 static inline void fpsimd_release_task(struct task_struct *task) { } 157 static inline void sve_sync_to_fpsimd(struct task_struct *task) { } 158 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { } 159 160 static inline int sve_set_current_vl(unsigned long arg) 161 { 162 return -EINVAL; 163 } 164 165 static inline int sve_get_current_vl(void) 166 { 167 return -EINVAL; 168 } 169 170 static inline void sve_user_disable(void) { BUILD_BUG(); } 171 static inline void sve_user_enable(void) { BUILD_BUG(); } 172 173 static inline void sve_init_vq_map(void) { } 174 static inline void sve_update_vq_map(void) { } 175 static inline int sve_verify_vq_map(void) { return 0; } 176 static inline void sve_setup(void) { } 177 178 #endif /* ! CONFIG_ARM64_SVE */ 179 180 /* For use by EFI runtime services calls only */ 181 extern void __efi_fpsimd_begin(void); 182 extern void __efi_fpsimd_end(void); 183 184 #endif 185 186 #endif 187