1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5 #ifndef __ASM_FP_H
6 #define __ASM_FP_H
7
8 #include <asm/errno.h>
9 #include <asm/ptrace.h>
10 #include <asm/processor.h>
11 #include <asm/sigcontext.h>
12 #include <asm/sysreg.h>
13
14 #ifndef __ASSEMBLY__
15
16 #include <linux/bitmap.h>
17 #include <linux/build_bug.h>
18 #include <linux/bug.h>
19 #include <linux/cache.h>
20 #include <linux/init.h>
21 #include <linux/stddef.h>
22 #include <linux/types.h>
23
24 #ifdef CONFIG_COMPAT
25 /* Masks for extracting the FPSR and FPCR from the FPSCR */
26 #define VFP_FPSCR_STAT_MASK 0xf800009f
27 #define VFP_FPSCR_CTRL_MASK 0x07f79f00
28 /*
29 * The VFP state has 32x64-bit registers and a single 32-bit
30 * control/status register.
31 */
32 #define VFP_STATE_SIZE ((32 * 8) + 4)
33 #endif
34
35 struct task_struct;
36
37 extern void fpsimd_save_state(struct user_fpsimd_state *state);
38 extern void fpsimd_load_state(struct user_fpsimd_state *state);
39
40 extern void fpsimd_thread_switch(struct task_struct *next);
41 extern void fpsimd_flush_thread(void);
42
43 extern void fpsimd_signal_preserve_current_state(void);
44 extern void fpsimd_preserve_current_state(void);
45 extern void fpsimd_restore_current_state(void);
46 extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
47
48 extern void fpsimd_bind_task_to_cpu(void);
49 extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state,
50 void *sve_state, unsigned int sve_vl);
51
52 extern void fpsimd_flush_task_state(struct task_struct *target);
53 extern void fpsimd_save_and_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 /* Offset of FFR in the SVE register dump */
sve_ffr_offset(int vl)59 static inline size_t sve_ffr_offset(int vl)
60 {
61 return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
62 }
63
sve_pffr(struct thread_struct * thread)64 static inline void *sve_pffr(struct thread_struct *thread)
65 {
66 return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl);
67 }
68
69 extern void sve_save_state(void *state, u32 *pfpsr);
70 extern void sve_load_state(void const *state, u32 const *pfpsr,
71 unsigned long vq_minus_1);
72 extern void sve_flush_live(void);
73 extern void sve_load_from_fpsimd_state(struct user_fpsimd_state const *state,
74 unsigned long vq_minus_1);
75 extern unsigned int sve_get_vl(void);
76
77 struct arm64_cpu_capabilities;
78 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
79
80 extern u64 read_zcr_features(void);
81
82 extern int __ro_after_init sve_max_vl;
83 extern int __ro_after_init sve_max_virtualisable_vl;
84 extern __ro_after_init DECLARE_BITMAP(sve_vq_map, SVE_VQ_MAX);
85
86 /*
87 * Helpers to translate bit indices in sve_vq_map to VQ values (and
88 * vice versa). This allows find_next_bit() to be used to find the
89 * _maximum_ VQ not exceeding a certain value.
90 */
__vq_to_bit(unsigned int vq)91 static inline unsigned int __vq_to_bit(unsigned int vq)
92 {
93 return SVE_VQ_MAX - vq;
94 }
95
__bit_to_vq(unsigned int bit)96 static inline unsigned int __bit_to_vq(unsigned int bit)
97 {
98 return SVE_VQ_MAX - bit;
99 }
100
101 /* Ensure vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX before calling this function */
sve_vq_available(unsigned int vq)102 static inline bool sve_vq_available(unsigned int vq)
103 {
104 return test_bit(__vq_to_bit(vq), sve_vq_map);
105 }
106
107 #ifdef CONFIG_ARM64_SVE
108
109 extern size_t sve_state_size(struct task_struct const *task);
110
111 extern void sve_alloc(struct task_struct *task);
112 extern void fpsimd_release_task(struct task_struct *task);
113 extern void fpsimd_sync_to_sve(struct task_struct *task);
114 extern void sve_sync_to_fpsimd(struct task_struct *task);
115 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
116
117 extern int sve_set_vector_length(struct task_struct *task,
118 unsigned long vl, unsigned long flags);
119
120 extern int sve_set_current_vl(unsigned long arg);
121 extern int sve_get_current_vl(void);
122
sve_user_disable(void)123 static inline void sve_user_disable(void)
124 {
125 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
126 }
127
sve_user_enable(void)128 static inline void sve_user_enable(void)
129 {
130 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
131 }
132
133 /*
134 * Probing and setup functions.
135 * Calls to these functions must be serialised with one another.
136 */
137 extern void __init sve_init_vq_map(void);
138 extern void sve_update_vq_map(void);
139 extern int sve_verify_vq_map(void);
140 extern void __init sve_setup(void);
141
142 #else /* ! CONFIG_ARM64_SVE */
143
sve_alloc(struct task_struct * task)144 static inline void sve_alloc(struct task_struct *task) { }
fpsimd_release_task(struct task_struct * task)145 static inline void fpsimd_release_task(struct task_struct *task) { }
sve_sync_to_fpsimd(struct task_struct * task)146 static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
sve_sync_from_fpsimd_zeropad(struct task_struct * task)147 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
148
sve_set_current_vl(unsigned long arg)149 static inline int sve_set_current_vl(unsigned long arg)
150 {
151 return -EINVAL;
152 }
153
sve_get_current_vl(void)154 static inline int sve_get_current_vl(void)
155 {
156 return -EINVAL;
157 }
158
sve_user_disable(void)159 static inline void sve_user_disable(void) { BUILD_BUG(); }
sve_user_enable(void)160 static inline void sve_user_enable(void) { BUILD_BUG(); }
161
sve_init_vq_map(void)162 static inline void sve_init_vq_map(void) { }
sve_update_vq_map(void)163 static inline void sve_update_vq_map(void) { }
sve_verify_vq_map(void)164 static inline int sve_verify_vq_map(void) { return 0; }
sve_setup(void)165 static inline void sve_setup(void) { }
166
167 #endif /* ! CONFIG_ARM64_SVE */
168
169 /* For use by EFI runtime services calls only */
170 extern void __efi_fpsimd_begin(void);
171 extern void __efi_fpsimd_end(void);
172
173 #endif
174
175 #endif
176