1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2020 Greg V <greg@unrelenting.technology> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef _FPU_API_H_ 29 #define _FPU_API_H_ 30 31 #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__) 32 33 #include <machine/fpu.h> 34 35 extern struct fpu_kern_ctx *__lkpi_fpu_ctx; 36 extern unsigned int __lkpi_fpu_ctx_level; 37 38 static inline void 39 kernel_fpu_begin() 40 { 41 if (__lkpi_fpu_ctx_level++ == 0) { 42 fpu_kern_enter(curthread, __lkpi_fpu_ctx, FPU_KERN_NORMAL); 43 } 44 } 45 46 static inline void 47 kernel_fpu_end() 48 { 49 if (--__lkpi_fpu_ctx_level == 0) { 50 fpu_kern_leave(curthread, __lkpi_fpu_ctx); 51 } 52 } 53 54 #else 55 56 static inline void 57 kernel_fpu_begin() 58 { 59 } 60 61 static inline void 62 kernel_fpu_end() 63 { 64 } 65 66 #endif 67 68 #endif /* _FPU_API_H_ */ 69