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Ayaan Tunio
2025-02-12 09:54:05 -05:00
commit 7118adc514
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51
kernel/include/platform/arm32/fpu/fpuv4.h Normal file
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#ifndef _KERNEL_PLATFORM_ARM32_FPU_FPUV4_H
#define _KERNEL_PLATFORM_ARM32_FPU_FPUV4_H
#include <drivers/driver_manager.h>
#include <libkern/mask.h>
#include <libkern/types.h>
#include <platform/arm32/interrupts.h>
#include <platform/arm32/registers.h>
#include <platform/arm32/target/cortex-a15/device_settings.h>
#define FPU_STATE_ALIGNMENT (16)
typedef struct {
uint64_t d[32];
} __attribute__((aligned(FPU_STATE_ALIGNMENT))) fpu_state_t;
void fpuv4_install();
void fpu_init_state(fpu_state_t* new_fpu_state);
extern uint32_t read_fpexc();
extern void write_fpexc(uint32_t);
extern void fpu_save(void*);
extern void fpu_restore(void*);
static inline void fpu_enable()
{
write_fpexc(read_fpexc() | (1 << 30));
}
static inline void fpu_disable()
{
write_fpexc(read_fpexc() & (~(1 << 30)));
}
static inline int fpu_is_avail()
{
return (((read_cpacr() >> 20) & 0b1111) == 0b1111);
}
static inline void fpu_make_avail()
{
write_cpacr(read_cpacr() | ((0b1111) << 20));
}
static inline void fpu_make_unavail()
{
// Simply turn it off to make it unavailble.
uint32_t val = read_cpacr() & (~((0b1111) << 20));
write_cpacr(val | ((0b0101) << 20));
}
#endif //_KERNEL_PLATFORM_ARM32_FPU_FPUV4_H