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/stddef.h> 26 27 /* 28 * FP/SIMD storage area has: 29 * - FPSR and FPCR 30 * - 32 128-bit data registers 31 * 32 * Note that user_fpsimd forms a prefix of this structure, which is 33 * relied upon in the ptrace FP/SIMD accessors. 34 */ 35 struct fpsimd_state { 36 union { 37 struct user_fpsimd_state user_fpsimd; 38 struct { 39 __uint128_t vregs[32]; 40 u32 fpsr; 41 u32 fpcr; 42 /* 43 * For ptrace compatibility, pad to next 128-bit 44 * boundary here if extending this struct. 45 */ 46 }; 47 }; 48 /* the id of the last cpu to have restored this state */ 49 unsigned int cpu; 50 }; 51 52 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 53 /* Masks for extracting the FPSR and FPCR from the FPSCR */ 54 #define VFP_FPSCR_STAT_MASK 0xf800009f 55 #define VFP_FPSCR_CTRL_MASK 0x07f79f00 56 /* 57 * The VFP state has 32x64-bit registers and a single 32-bit 58 * control/status register. 59 */ 60 #define VFP_STATE_SIZE ((32 * 8) + 4) 61 #endif 62 63 struct task_struct; 64 65 extern void fpsimd_save_state(struct fpsimd_state *state); 66 extern void fpsimd_load_state(struct fpsimd_state *state); 67 68 extern void fpsimd_thread_switch(struct task_struct *next); 69 extern void fpsimd_flush_thread(void); 70 71 extern void fpsimd_signal_preserve_current_state(void); 72 extern void fpsimd_preserve_current_state(void); 73 extern void fpsimd_restore_current_state(void); 74 extern void fpsimd_update_current_state(struct fpsimd_state *state); 75 76 extern void fpsimd_flush_task_state(struct task_struct *target); 77 extern void sve_flush_cpu_state(void); 78 79 /* Maximum VL that SVE VL-agnostic software can transparently support */ 80 #define SVE_VL_ARCH_MAX 0x100 81 82 extern void sve_save_state(void *state, u32 *pfpsr); 83 extern void sve_load_state(void const *state, u32 const *pfpsr, 84 unsigned long vq_minus_1); 85 extern unsigned int sve_get_vl(void); 86 extern int sve_kernel_enable(void *); 87 88 extern int __ro_after_init sve_max_vl; 89 90 #ifdef CONFIG_ARM64_SVE 91 92 extern size_t sve_state_size(struct task_struct const *task); 93 94 extern void sve_alloc(struct task_struct *task); 95 extern void fpsimd_release_task(struct task_struct *task); 96 extern void fpsimd_sync_to_sve(struct task_struct *task); 97 extern void sve_sync_to_fpsimd(struct task_struct *task); 98 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task); 99 100 extern int sve_set_vector_length(struct task_struct *task, 101 unsigned long vl, unsigned long flags); 102 103 extern int sve_set_current_vl(unsigned long arg); 104 extern int sve_get_current_vl(void); 105 106 /* 107 * Probing and setup functions. 108 * Calls to these functions must be serialised with one another. 109 */ 110 extern void __init sve_init_vq_map(void); 111 extern void sve_update_vq_map(void); 112 extern int sve_verify_vq_map(void); 113 extern void __init sve_setup(void); 114 115 #else /* ! CONFIG_ARM64_SVE */ 116 117 static inline void sve_alloc(struct task_struct *task) { } 118 static inline void fpsimd_release_task(struct task_struct *task) { } 119 static inline void sve_sync_to_fpsimd(struct task_struct *task) { } 120 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { } 121 122 static inline int sve_set_current_vl(unsigned long arg) 123 { 124 return -EINVAL; 125 } 126 127 static inline int sve_get_current_vl(void) 128 { 129 return -EINVAL; 130 } 131 132 static inline void sve_init_vq_map(void) { } 133 static inline void sve_update_vq_map(void) { } 134 static inline int sve_verify_vq_map(void) { return 0; } 135 static inline void sve_setup(void) { } 136 137 #endif /* ! CONFIG_ARM64_SVE */ 138 139 /* For use by EFI runtime services calls only */ 140 extern void __efi_fpsimd_begin(void); 141 extern void __efi_fpsimd_end(void); 142 143 #endif 144 145 #endif 146