45 lines
926 B
C
45 lines
926 B
C
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#ifndef _KERNEL_PLATFORM_ARM64_FPU_FPU_H
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#define _KERNEL_PLATFORM_ARM64_FPU_FPU_H
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#include <libkern/kassert.h>
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#include <libkern/types.h>
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#include <platform/arm64/registers.h>
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#define FPU_STATE_ALIGNMENT (32)
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typedef struct {
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uint64_t halfv[64];
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} __attribute__((aligned(FPU_STATE_ALIGNMENT))) fpu_state_t;
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void fpu_install();
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void fpu_init_state(fpu_state_t* new_fpu_state);
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extern void fpu_save(void*);
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extern void fpu_restore(void*);
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static inline void fpu_enable()
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{
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}
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static inline void fpu_disable()
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{
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}
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static inline int fpu_is_avail()
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{
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return (((read_cpacr() >> 20) & 0b11) == 0b11);
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}
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static inline void fpu_make_avail()
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{
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write_cpacr(read_cpacr() | ((0b11) << 20));
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}
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static inline void fpu_make_unavail()
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{
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// Simply turn it off to make it unavailble.
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uint64_t val = read_cpacr() & (~((3ull) << 20));
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write_cpacr(val | ((0b01) << 20));
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}
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#endif //_KERNEL_PLATFORM_ARM64_FPU_FPU_H
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