1 /* 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 5 * 1.0 of the CDDL. 6 * 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. 10 */ 11 12 /* 13 * Copyright 2020 Joyent, Inc. 14 */ 15 16 #ifndef _SYS_KFPU_H 17 #define _SYS_KFPU_H 18 19 /* 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. 22 */ 23 24 #include <sys/types.h> 25 26 #ifdef __cplusplus 27 extern "C" { 28 #endif 29 30 typedef struct kfpu_state kfpu_state_t; 31 32 /* 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. 37 */ 38 extern kfpu_state_t *kernel_fpu_alloc(int); 39 extern void kernel_fpu_free(kfpu_state_t *); 40 41 /* 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. 45 */ 46 extern void kernel_fpu_begin(kfpu_state_t *, uint_t); 47 extern void kernel_fpu_end(kfpu_state_t *, uint_t); 48 49 /* 50 * Internal validation function. 51 */ 52 extern void kernel_fpu_no_swtch(void); 53 54 /* 55 * Flag definitions for kernel_fpu_begin and kernel_fpu_end. 56 */ 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 */ 59 60 #ifdef __cplusplus 61 } 62 #endif 63 64 #endif /* _SYS_KFPU_H */ 65