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 unsigned int sve_get_vl(void);
73
74 struct arm64_cpu_capabilities;
75 extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
76
77 extern u64 read_zcr_features(void);
78
79 extern int __ro_after_init sve_max_vl;
80 extern int __ro_after_init sve_max_virtualisable_vl;
81 extern __ro_after_init DECLARE_BITMAP(sve_vq_map, SVE_VQ_MAX);
82
83 /*
84 * Helpers to translate bit indices in sve_vq_map to VQ values (and
85 * vice versa). This allows find_next_bit() to be used to find the
86 * _maximum_ VQ not exceeding a certain value.
87 */
__vq_to_bit(unsigned int vq)88 static inline unsigned int __vq_to_bit(unsigned int vq)
89 {
90 return SVE_VQ_MAX - vq;
91 }
92
__bit_to_vq(unsigned int bit)93 static inline unsigned int __bit_to_vq(unsigned int bit)
94 {
95 return SVE_VQ_MAX - bit;
96 }
97
98 /* Ensure vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX before calling this function */
sve_vq_available(unsigned int vq)99 static inline bool sve_vq_available(unsigned int vq)
100 {
101 return test_bit(__vq_to_bit(vq), sve_vq_map);
102 }
103
104 #ifdef CONFIG_ARM64_SVE
105
106 extern size_t sve_state_size(struct task_struct const *task);
107
108 extern void sve_alloc(struct task_struct *task);
109 extern void fpsimd_release_task(struct task_struct *task);
110 extern void fpsimd_sync_to_sve(struct task_struct *task);
111 extern void sve_sync_to_fpsimd(struct task_struct *task);
112 extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
113
114 extern int sve_set_vector_length(struct task_struct *task,
115 unsigned long vl, unsigned long flags);
116
117 extern int sve_set_current_vl(unsigned long arg);
118 extern int sve_get_current_vl(void);
119
sve_user_disable(void)120 static inline void sve_user_disable(void)
121 {
122 sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
123 }
124
sve_user_enable(void)125 static inline void sve_user_enable(void)
126 {
127 sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
128 }
129
130 /*
131 * Probing and setup functions.
132 * Calls to these functions must be serialised with one another.
133 */
134 extern void __init sve_init_vq_map(void);
135 extern void sve_update_vq_map(void);
136 extern int sve_verify_vq_map(void);
137 extern void __init sve_setup(void);
138
139 #else /* ! CONFIG_ARM64_SVE */
140
sve_alloc(struct task_struct * task)141 static inline void sve_alloc(struct task_struct *task) { }
fpsimd_release_task(struct task_struct * task)142 static inline void fpsimd_release_task(struct task_struct *task) { }
sve_sync_to_fpsimd(struct task_struct * task)143 static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
sve_sync_from_fpsimd_zeropad(struct task_struct * task)144 static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
145
sve_set_current_vl(unsigned long arg)146 static inline int sve_set_current_vl(unsigned long arg)
147 {
148 return -EINVAL;
149 }
150
sve_get_current_vl(void)151 static inline int sve_get_current_vl(void)
152 {
153 return -EINVAL;
154 }
155
sve_user_disable(void)156 static inline void sve_user_disable(void) { BUILD_BUG(); }
sve_user_enable(void)157 static inline void sve_user_enable(void) { BUILD_BUG(); }
158
sve_init_vq_map(void)159 static inline void sve_init_vq_map(void) { }
sve_update_vq_map(void)160 static inline void sve_update_vq_map(void) { }
sve_verify_vq_map(void)161 static inline int sve_verify_vq_map(void) { return 0; }
sve_setup(void)162 static inline void sve_setup(void) { }
163
164 #endif /* ! CONFIG_ARM64_SVE */
165
166 /* For use by EFI runtime services calls only */
167 extern void __efi_fpsimd_begin(void);
168 extern void __efi_fpsimd_end(void);
169
170 #endif
171
172 #endif
173
