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 145