tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/errno.h>
20#include <asm/ptrace.h>
21#include <asm/processor.h>
22#include <asm/sigcontext.h>
23#include <asm/sysreg.h>
24
25#ifndef __ASSEMBLY__
26
27#include <linux/build_bug.h>
28#include <linux/cache.h>
29#include <linux/init.h>
30#include <linux/stddef.h>
31
32#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
33/* Masks for extracting the FPSR and FPCR from the FPSCR */
34#define VFP_FPSCR_STAT_MASK 0xf800009f
35#define VFP_FPSCR_CTRL_MASK 0x07f79f00
36/*
37 * The VFP state has 32x64-bit registers and a single 32-bit
38 * control/status register.
39 */
40#define VFP_STATE_SIZE ((32 * 8) + 4)
41#endif
42
43struct task_struct;
44
45extern void fpsimd_save_state(struct user_fpsimd_state *state);
46extern void fpsimd_load_state(struct user_fpsimd_state *state);
47
48extern void fpsimd_save(void);
49
50extern void fpsimd_thread_switch(struct task_struct *next);
51extern void fpsimd_flush_thread(void);
52
53extern void fpsimd_signal_preserve_current_state(void);
54extern void fpsimd_preserve_current_state(void);
55extern void fpsimd_restore_current_state(void);
56extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
57
58extern void fpsimd_bind_task_to_cpu(void);
59extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state);
60
61extern void fpsimd_flush_task_state(struct task_struct *target);
62extern void fpsimd_flush_cpu_state(void);
63extern void sve_flush_cpu_state(void);
64
65/* Maximum VL that SVE VL-agnostic software can transparently support */
66#define SVE_VL_ARCH_MAX 0x100
67
68/* Offset of FFR in the SVE register dump */
69static inline size_t sve_ffr_offset(int vl)
70{
71 return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
72}
73
74static inline void *sve_pffr(struct thread_struct *thread)
75{
76 return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl);
77}
78
79extern void sve_save_state(void *state, u32 *pfpsr);
80extern void sve_load_state(void const *state, u32 const *pfpsr,
81 unsigned long vq_minus_1);
82extern unsigned int sve_get_vl(void);
83
84struct arm64_cpu_capabilities;
85extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
86
87extern u64 read_zcr_features(void);
88
89extern int __ro_after_init sve_max_vl;
90
91#ifdef CONFIG_ARM64_SVE
92
93extern size_t sve_state_size(struct task_struct const *task);
94
95extern void sve_alloc(struct task_struct *task);
96extern void fpsimd_release_task(struct task_struct *task);
97extern void fpsimd_sync_to_sve(struct task_struct *task);
98extern void sve_sync_to_fpsimd(struct task_struct *task);
99extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
100
101extern int sve_set_vector_length(struct task_struct *task,
102 unsigned long vl, unsigned long flags);
103
104extern int sve_set_current_vl(unsigned long arg);
105extern int sve_get_current_vl(void);
106
107static inline void sve_user_disable(void)
108{
109 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
110}
111
112static inline void sve_user_enable(void)
113{
114 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
115}
116
117/*
118 * Probing and setup functions.
119 * Calls to these functions must be serialised with one another.
120 */
121extern void __init sve_init_vq_map(void);
122extern void sve_update_vq_map(void);
123extern int sve_verify_vq_map(void);
124extern void __init sve_setup(void);
125
126#else /* ! CONFIG_ARM64_SVE */
127
128static inline void sve_alloc(struct task_struct *task) { }
129static inline void fpsimd_release_task(struct task_struct *task) { }
130static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
131static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
132
133static inline int sve_set_current_vl(unsigned long arg)
134{
135 return -EINVAL;
136}
137
138static inline int sve_get_current_vl(void)
139{
140 return -EINVAL;
141}
142
143static inline void sve_user_disable(void) { BUILD_BUG(); }
144static inline void sve_user_enable(void) { BUILD_BUG(); }
145
146static inline void sve_init_vq_map(void) { }
147static inline void sve_update_vq_map(void) { }
148static inline int sve_verify_vq_map(void) { return 0; }
149static inline void sve_setup(void) { }
150
151#endif /* ! CONFIG_ARM64_SVE */
152
153/* For use by EFI runtime services calls only */
154extern void __efi_fpsimd_begin(void);
155extern void __efi_fpsimd_end(void);
156
157#endif
158
159#endif