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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Joyent, Inc.
*/
#ifndef _SYS_KFPU_H
#define _SYS_KFPU_H
/*
* This header file provides a means for the kernel to opt into using the FPU.
* Care should be exercised when using the FPU.
*/
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct kfpu_state kfpu_state_t;
/*
* Allocate a new kernel FPU state. This may be allocated at a time independent
* from its use. It will stay around until such a time as kernel_fpu_free() is
* called. A given kernel FPU state may only be used by a single thread at any
* time; however, it is not bound to a given thread.
*/
extern kfpu_state_t *kernel_fpu_alloc(int);
extern void kernel_fpu_free(kfpu_state_t *);
/*
* These functions begin and end the use of the kernel FPU. Once this is called,
* a given kernel thread will be allowed to use the FPU. This will be saved and
* restored across context switches.
*/
extern void kernel_fpu_begin(kfpu_state_t *, uint_t);
extern void kernel_fpu_end(kfpu_state_t *, uint_t);
/*
* Internal validation function.
*/
extern void kernel_fpu_no_swtch(void);
/*
* Flag definitions for kernel_fpu_begin and kernel_fpu_end.
*/
#define KFPU_NO_STATE 0x01 /* kfpu_state_t not passed; use preemption */
#define KFPU_USE_LWP 0x02 /* kfpu_state_t not passed; use lwp */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_KFPU_H */
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