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_SPINLOCK_H_ 28 #define _LINUX_SPINLOCK_H_ 29 30 #include <linux/preempt.h> 31 #include <linux/linkage.h> 32 #include <linux/compiler.h> 33 #include <linux/irqflags.h> 34 #include <linux/thread_info.h> 35 #include <linux/kernel.h> 36 #include <linux/stringify.h> 37 #include <linux/bottom_half.h> 38 #include <asm/barrier.h> 39 40 #include <linux/rwlock.h> 41 42 #include <sys/spinlock2.h> 43 #include <sys/lock.h> 44 45 #define spin_is_locked(x) spin_held(x) 46 47 #define assert_spin_locked(x) KKASSERT(lockinuse(x)) 48 49 typedef struct lock spinlock_t; 50 51 /* 52 * The spin_lock_irq() family of functions stop hardware interrupts 53 * from being delivered to the local CPU. 54 * A crit_enter()/crit_exit() sequence does the same thing on the 55 * DragonFly kernel 56 */ 57 static inline void spin_lock_irq(struct lock *lock) 58 { 59 crit_enter(); 60 lockmgr(lock, LK_EXCLUSIVE); 61 } 62 63 static inline void spin_unlock_irq(struct lock *lock) 64 { 65 lockmgr(lock, LK_RELEASE); 66 crit_exit(); 67 } 68 69 #define spin_lock_irqsave(lock, flags) do { flags = 0; spin_lock_irq(lock); } while(0) 70 #define spin_unlock_irqrestore(lock, flags) do { flags = 0; spin_unlock_irq(lock); } while(0) 71 72 static inline void 73 spin_lock_bh(struct lock *lock) 74 { 75 spin_lock_irq(lock); 76 } 77 78 static inline void 79 spin_unlock_bh(struct lock *lock) 80 { 81 spin_unlock_irq(lock); 82 } 83 84 #define DEFINE_SPINLOCK(x) struct lock x = LOCK_INITIALIZER("ds##x", 0, 0) 85 86 #define spin_lock_irqsave_nested(lock, flags, subclass) \ 87 spin_lock_irqsave(lock, flags) 88 89 #endif /* _LINUX_SPINLOCK_H_ */ 90