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