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>
20 #include <asm/errno.h>
24 #include <linux/cache.h>
25 #include <linux/init.h>
26 #include <linux/stddef.h>
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
33 * The VFP state has 32x64-bit registers and a single 32-bit
34 * control/status register.
36 #define VFP_STATE_SIZE ((32 * 8) + 4)
41 extern void fpsimd_save_state(struct user_fpsimd_state *state);
42 extern void fpsimd_load_state(struct user_fpsimd_state *state);
44 extern void fpsimd_thread_switch(struct task_struct *next);
45 extern void fpsimd_flush_thread(void);
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);
52 extern void fpsimd_flush_task_state(struct task_struct *target);
53 extern void sve_flush_cpu_state(void);
55 /* Maximum VL that SVE VL-agnostic software can transparently support */
56 #define SVE_VL_ARCH_MAX 0x100
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);
63 struct arm64_cpu_capabilities;
64 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
66 extern int __ro_after_init sve_max_vl;
68 #ifdef CONFIG_ARM64_SVE
70 extern size_t sve_state_size(struct task_struct const *task);
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);
78 extern int sve_set_vector_length(struct task_struct *task,
79 unsigned long vl, unsigned long flags);
81 extern int sve_set_current_vl(unsigned long arg);
82 extern int sve_get_current_vl(void);
85 * Probing and setup functions.
86 * Calls to these functions must be serialised with one another.
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);
93 #else /* ! CONFIG_ARM64_SVE */
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) { }
100 static inline int sve_set_current_vl(unsigned long arg)
105 static inline int sve_get_current_vl(void)
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) { }
115 #endif /* ! CONFIG_ARM64_SVE */
117 /* For use by EFI runtime services calls only */
118 extern void __efi_fpsimd_begin(void);
119 extern void __efi_fpsimd_end(void);