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 22 #ifndef __ASSEMBLY__ 23 24 #include <linux/cache.h> 25 #include <linux/init.h> 26 #include <linux/stddef.h> 27 28 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 29 /* Masks for extracting the FPSR and FPCR from the FPSCR */ 30 #define VFP_FPSCR_STAT_MASK 0xf800009f 31 #define VFP_FPSCR_CTRL_MASK 0x07f79f00 32 /* 33 * The VFP state has 32x64-bit registers and a single 32-bit 34 * control/status register. 35 */ 36 #define VFP_STATE_SIZE ((32 * 8) + 4) 37 #endif 38 39 struct task_struct; 40 41 extern void fpsimd_save_state(struct user_fpsimd_state *state); 42 extern void fpsimd_load_state(struct user_fpsimd_state *state); 43 44 extern void fpsimd_thread_switch(struct task_struct *next); 45 extern void fpsimd_flush_thread(void); 46 47 extern void fpsimd_signal_preserve_current_state(void); 48 extern void fpsimd_preserve_current_state(void); 49 extern void fpsimd_restore_current_state(void); 50 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state); 51 52 extern void fpsimd_flush_task_state(struct task_struct *target); 53 extern void sve_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 extern void sve_save_state(void *state, u32 *pfpsr); 59 extern void sve_load_state(void const *state, u32 const *pfpsr, 60 unsigned long vq_minus_1); 61 extern unsigned int sve_get_vl(void); 62 63 struct arm64_cpu_capabilities; 64 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused); 65 66 extern int __ro_after_init sve_max_vl; 67 68 #ifdef CONFIG_ARM64_SVE 69 70 extern size_t sve_state_size(struct task_struct const *task); 71 72 extern void sve_alloc(struct task_struct *task); 73 extern void fpsimd_release_task(struct task_struct *task); 74 extern void fpsimd_sync_to_sve(struct task_struct *task); 75 extern void sve_sync_to_fpsimd(struct task_struct *task); 76 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task); 77 78 extern int sve_set_vector_length(struct task_struct *task, 79 unsigned long vl, unsigned long flags); 80 81 extern int sve_set_current_vl(unsigned long arg); 82 extern int sve_get_current_vl(void); 83 84 /* 85 * Probing and setup functions. 86 * Calls to these functions must be serialised with one another. 87 */ 88 extern void __init sve_init_vq_map(void); 89 extern void sve_update_vq_map(void); 90 extern int sve_verify_vq_map(void); 91 extern void __init sve_setup(void); 92 93 #else /* ! CONFIG_ARM64_SVE */ 94 95 static inline void sve_alloc(struct task_struct *task) { } 96 static inline void fpsimd_release_task(struct task_struct *task) { } 97 static inline void sve_sync_to_fpsimd(struct task_struct *task) { } 98 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { } 99 100 static inline int sve_set_current_vl(unsigned long arg) 101 { 102 return -EINVAL; 103 } 104 105 static inline int sve_get_current_vl(void) 106 { 107 return -EINVAL; 108 } 109 110 static inline void sve_init_vq_map(void) { } 111 static inline void sve_update_vq_map(void) { } 112 static inline int sve_verify_vq_map(void) { return 0; } 113 static inline void sve_setup(void) { } 114 115 #endif /* ! CONFIG_ARM64_SVE */ 116 117 /* For use by EFI runtime services calls only */ 118 extern void __efi_fpsimd_begin(void); 119 extern void __efi_fpsimd_end(void); 120 121 #endif 122 123 #endif 124