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/* SPDX-License-Identifier: GPL-2.0-only */
* Copyright (C) 2012 ARM Ltd.
#ifndef __ASM_FP_H
#define __ASM_FP_H
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/sigcontext.h>
#include <asm/sysreg.h>
#ifndef __ASSEMBLY__
#include <linux/bitmap.h>
#include <linux/build_bug.h>
#include <linux/bug.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/stddef.h>
#include <linux/types.h>
/* Masks for extracting the FPSR and FPCR from the FPSCR */
#define VFP_FPSCR_STAT_MASK 0xf800009f
#define VFP_FPSCR_CTRL_MASK 0x07f79f00
* The VFP state has 32x64-bit registers and a single 32-bit
* control/status register.
#define VFP_STATE_SIZE ((32 * 8) + 4)
struct task_struct;
extern void fpsimd_save_state(struct user_fpsimd_state *state);
extern void fpsimd_load_state(struct user_fpsimd_state *state);
extern void fpsimd_thread_switch(struct task_struct *next);
extern void fpsimd_flush_thread(void);
extern void fpsimd_signal_preserve_current_state(void);
extern void fpsimd_preserve_current_state(void);
extern void fpsimd_restore_current_state(void);
extern void fpsimd_update_current_state(struct user_fpsimd_state const *state);
extern void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *state,
void *sve_state, unsigned int sve_vl);
extern void fpsimd_flush_task_state(struct task_struct *target);
extern void fpsimd_save_and_flush_cpu_state(void);
/* Maximum VL that SVE VL-agnostic software can transparently support */
#define SVE_VL_ARCH_MAX 0x100
/* Offset of FFR in the SVE register dump */
static inline size_t sve_ffr_offset(int vl)
return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
static inline void *sve_pffr(struct thread_struct *thread)
return (char *)thread->sve_state + sve_ffr_offset(thread_get_sve_vl(thread));
extern void sve_save_state(void *state, u32 *pfpsr, int save_ffr);
extern void sve_load_state(void const *state, u32 const *pfpsr,
int restore_ffr);
extern void sve_flush_live(bool flush_ffr, unsigned long vq_minus_1);
extern unsigned int sve_get_vl(void);
extern void sve_set_vq(unsigned long vq_minus_1);
struct arm64_cpu_capabilities;
extern void sve_kernel_enable(const struct arm64_cpu_capabilities *__unused);
extern u64 read_zcr_features(void);
* Helpers to translate bit indices in sve_vq_map to VQ values (and
* vice versa). This allows find_next_bit() to be used to find the
* _maximum_ VQ not exceeding a certain value.
static inline unsigned int __vq_to_bit(unsigned int vq)
return SVE_VQ_MAX - vq;
static inline unsigned int __bit_to_vq(unsigned int bit)
return SVE_VQ_MAX - bit;
struct vl_info {
enum vec_type type;
const char *name; /* For display purposes */
/* Minimum supported vector length across all CPUs */
int min_vl;
/* Maximum supported vector length across all CPUs */
int max_vl;
int max_virtualisable_vl;
* Set of available vector lengths,
* where length vq encoded as bit __vq_to_bit(vq):
/* Set of vector lengths present on at least one cpu: */
DECLARE_BITMAP(vq_partial_map, SVE_VQ_MAX);
extern void sve_alloc(struct task_struct *task);
extern void fpsimd_release_task(struct task_struct *task);
extern void fpsimd_sync_to_sve(struct task_struct *task);
extern void sve_sync_to_fpsimd(struct task_struct *task);
extern void sve_sync_from_fpsimd_zeropad(struct task_struct *task);
extern int sve_set_vector_length(struct task_struct *task,
unsigned long vl, unsigned long flags);
extern int sve_set_current_vl(unsigned long arg);
extern int sve_get_current_vl(void);
static inline void sve_user_disable(void)
sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
static inline void sve_user_enable(void)
sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
#define sve_cond_update_zcr_vq(val, reg) \
do { \
u64 __zcr = read_sysreg_s((reg)); \
u64 __new = __zcr & ~ZCR_ELx_LEN_MASK; \
__new |= (val) & ZCR_ELx_LEN_MASK; \
if (__zcr != __new) \
write_sysreg_s(__new, (reg)); \
} while (0)
* Probing and setup functions.
* Calls to these functions must be serialised with one another.
enum vec_type;
extern void __init vec_init_vq_map(enum vec_type type);
extern void vec_update_vq_map(enum vec_type type);
extern int vec_verify_vq_map(enum vec_type type);
extern void __init sve_setup(void);
extern __ro_after_init struct vl_info vl_info[ARM64_VEC_MAX];
static inline void write_vl(enum vec_type type, u64 val)
u64 tmp;
switch (type) {
case ARM64_VEC_SVE:
tmp = read_sysreg_s(SYS_ZCR_EL1) & ~ZCR_ELx_LEN_MASK;
write_sysreg_s(tmp | val, SYS_ZCR_EL1);
static inline int vec_max_vl(enum vec_type type)
return vl_info[type].max_vl;
static inline int vec_max_virtualisable_vl(enum vec_type type)
return vl_info[type].max_virtualisable_vl;
static inline int sve_max_vl(void)
return vec_max_vl(ARM64_VEC_SVE);
static inline int sve_max_virtualisable_vl(void)
return vec_max_virtualisable_vl(ARM64_VEC_SVE);
/* Ensure vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX before calling this function */
static inline bool vq_available(enum vec_type type, unsigned int vq)
return test_bit(__vq_to_bit(vq), vl_info[type].vq_map);
static inline bool sve_vq_available(unsigned int vq)
return vq_available(ARM64_VEC_SVE, vq);
#else /* ! CONFIG_ARM64_SVE */
static inline void sve_alloc(struct task_struct *task) { }
static inline void fpsimd_release_task(struct task_struct *task) { }
static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
static inline int sve_max_virtualisable_vl(void)
return 0;
static inline int sve_set_current_vl(unsigned long arg)
return -EINVAL;
static inline int sve_get_current_vl(void)
return -EINVAL;
static inline int sve_max_vl(void)
return -EINVAL;
static inline bool sve_vq_available(unsigned int vq) { return false; }
static inline void sve_user_disable(void) { BUILD_BUG(); }
static inline void sve_user_enable(void) { BUILD_BUG(); }
#define sve_cond_update_zcr_vq(val, reg) do { } while (0)
static inline void vec_init_vq_map(enum vec_type t) { }
static inline void vec_update_vq_map(enum vec_type t) { }
static inline int vec_verify_vq_map(enum vec_type t) { return 0; }
static inline void sve_setup(void) { }
#endif /* ! CONFIG_ARM64_SVE */
/* For use by EFI runtime services calls only */
extern void __efi_fpsimd_begin(void);
extern void __efi_fpsimd_end(void);