2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
19 #include <asm/ptrace.h>
23 #include <linux/cache.h>
24 #include <linux/stddef.h>
27 * FP/SIMD storage area has:
29 * - 32 128-bit data registers
31 * Note that user_fpsimd forms a prefix of this structure, which is
32 * relied upon in the ptrace FP/SIMD accessors.
36 struct user_fpsimd_state user_fpsimd;
38 __uint128_t vregs[32];
43 /* the id of the last cpu to have restored this state */
48 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
49 /* Masks for extracting the FPSR and FPCR from the FPSCR */
50 #define VFP_FPSCR_STAT_MASK 0xf800009f
51 #define VFP_FPSCR_CTRL_MASK 0x07f79f00
53 * The VFP state has 32x64-bit registers and a single 32-bit
54 * control/status register.
56 #define VFP_STATE_SIZE ((32 * 8) + 4)
61 extern void fpsimd_save_state(struct fpsimd_state *state);
62 extern void fpsimd_load_state(struct fpsimd_state *state);
64 extern void fpsimd_thread_switch(struct task_struct *next);
65 extern void fpsimd_flush_thread(void);
67 extern void fpsimd_signal_preserve_current_state(void);
68 extern void fpsimd_preserve_current_state(void);
69 extern void fpsimd_restore_current_state(void);
70 extern void fpsimd_update_current_state(struct fpsimd_state *state);
72 extern void fpsimd_flush_task_state(struct task_struct *target);
74 /* Maximum VL that SVE VL-agnostic software can transparently support */
75 #define SVE_VL_ARCH_MAX 0x100
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 extern int sve_kernel_enable(void *);
83 extern int __ro_after_init sve_max_vl;
85 #ifdef CONFIG_ARM64_SVE
87 extern size_t sve_state_size(struct task_struct const *task);
89 extern void sve_alloc(struct task_struct *task);
90 extern void fpsimd_release_task(struct task_struct *task);
91 extern int sve_set_vector_length(struct task_struct *task,
92 unsigned long vl, unsigned long flags);
95 * Probing and setup functions.
96 * Calls to these functions must be serialised with one another.
98 extern void __init sve_init_vq_map(void);
99 extern void sve_update_vq_map(void);
100 extern int sve_verify_vq_map(void);
101 extern void __init sve_setup(void);
103 #else /* ! CONFIG_ARM64_SVE */
105 static inline void sve_alloc(struct task_struct *task) { }
106 static inline void fpsimd_release_task(struct task_struct *task) { }
107 static inline void sve_init_vq_map(void) { }
108 static inline void sve_update_vq_map(void) { }
109 static inline int sve_verify_vq_map(void) { return 0; }
110 static inline void sve_setup(void) { }
112 #endif /* ! CONFIG_ARM64_SVE */
114 /* For use by EFI runtime services calls only */
115 extern void __efi_fpsimd_begin(void);
116 extern void __efi_fpsimd_end(void);