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/build_bug.h> 28 #include <linux/cache.h> 29 #include <linux/init.h> 30 #include <linux/stddef.h> 31 32 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 33 /* Masks for extracting the FPSR and FPCR from the FPSCR */ 34 #define VFP_FPSCR_STAT_MASK 0xf800009f 35 #define VFP_FPSCR_CTRL_MASK 0x07f79f00 36 /* 37 * The VFP state has 32x64-bit registers and a single 32-bit 38 * control/status register. 39 */ 40 #define VFP_STATE_SIZE ((32 * 8) + 4) 41 #endif 42 43 struct task_struct; 44 45 extern void fpsimd_save_state(struct user_fpsimd_state *state); 46 extern void fpsimd_load_state(struct user_fpsimd_state *state); 47 48 extern void fpsimd_save(void); 49 50 extern void fpsimd_thread_switch(struct task_struct *next); 51 extern void fpsimd_flush_thread(void); 52 53 extern void fpsimd_signal_preserve_current_state(void); 54 extern void fpsimd_preserve_current_state(void); 55 extern void fpsimd_restore_current_state(void); 56 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state); 57 58 extern void fpsimd_bind_task_to_cpu(void); 59 extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state); 60 61 extern void fpsimd_flush_task_state(struct task_struct *target); 62 extern void fpsimd_flush_cpu_state(void); 63 extern void sve_flush_cpu_state(void); 64 65 /* Maximum VL that SVE VL-agnostic software can transparently support */ 66 #define SVE_VL_ARCH_MAX 0x100 67 68 /* Offset of FFR in the SVE register dump */ 69 static inline size_t sve_ffr_offset(int vl) 70 { 71 return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET; 72 } 73 74 static inline void *sve_pffr(struct thread_struct *thread) 75 { 76 return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl); 77 } 78 79 extern void sve_save_state(void *state, u32 *pfpsr); 80 extern void sve_load_state(void const *state, u32 const *pfpsr, 81 unsigned long vq_minus_1); 82 extern unsigned int sve_get_vl(void); 83 84 struct arm64_cpu_capabilities; 85 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused); 86 87 extern u64 read_zcr_features(void); 88 89 extern int __ro_after_init sve_max_vl; 90 91 #ifdef CONFIG_ARM64_SVE 92 93 extern size_t sve_state_size(struct task_struct const *task); 94 95 extern void sve_alloc(struct task_struct *task); 96 extern void fpsimd_release_task(struct task_struct *task); 97 extern void fpsimd_sync_to_sve(struct task_struct *task); 98 extern void sve_sync_to_fpsimd(struct task_struct *task); 99 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task); 100 101 extern int sve_set_vector_length(struct task_struct *task, 102 unsigned long vl, unsigned long flags); 103 104 extern int sve_set_current_vl(unsigned long arg); 105 extern int sve_get_current_vl(void); 106 107 static inline void sve_user_disable(void) 108 { 109 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0); 110 } 111 112 static inline void sve_user_enable(void) 113 { 114 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN); 115 } 116 117 /* 118 * Probing and setup functions. 119 * Calls to these functions must be serialised with one another. 120 */ 121 extern void __init sve_init_vq_map(void); 122 extern void sve_update_vq_map(void); 123 extern int sve_verify_vq_map(void); 124 extern void __init sve_setup(void); 125 126 #else /* ! CONFIG_ARM64_SVE */ 127 128 static inline void sve_alloc(struct task_struct *task) { } 129 static inline void fpsimd_release_task(struct task_struct *task) { } 130 static inline void sve_sync_to_fpsimd(struct task_struct *task) { } 131 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { } 132 133 static inline int sve_set_current_vl(unsigned long arg) 134 { 135 return -EINVAL; 136 } 137 138 static inline int sve_get_current_vl(void) 139 { 140 return -EINVAL; 141 } 142 143 static inline void sve_user_disable(void) { BUILD_BUG(); } 144 static inline void sve_user_enable(void) { BUILD_BUG(); } 145 146 static inline void sve_init_vq_map(void) { } 147 static inline void sve_update_vq_map(void) { } 148 static inline int sve_verify_vq_map(void) { return 0; } 149 static inline void sve_setup(void) { } 150 151 #endif /* ! CONFIG_ARM64_SVE */ 152 153 /* For use by EFI runtime services calls only */ 154 extern void __efi_fpsimd_begin(void); 155 extern void __efi_fpsimd_end(void); 156 157 #endif 158 159 #endif 160