1 /* 2 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_IRQFLAGS_H_ 28 #define _LINUX_IRQFLAGS_H_ 29 30 #include <linux/typecheck.h> 31 32 static inline void 33 local_irq_disable(void) 34 { 35 __asm __volatile("cli": : :"memory"); 36 } 37 38 static inline void 39 local_irq_enable(void) 40 { 41 __asm __volatile("sti": : :"memory"); 42 } 43 44 static inline bool 45 irqs_disabled(void) 46 { 47 return !(read_rflags() & 0x200UL); 48 } 49 50 #define local_irq_save(flags) \ 51 ({ \ 52 flags = read_rflags(); \ 53 local_irq_disable(); \ 54 }) 55 56 static inline void 57 local_irq_restore(unsigned long flags) 58 { 59 write_rflags(flags); 60 } 61 62 #endif /* _LINUX_IRQFLAGS_H_ */ 63