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/typecheck.h>
31 #include <linux/preempt.h>
32 #include <linux/linkage.h>
33 #include <linux/compiler.h>
34 #include <linux/irqflags.h>
35 #include <linux/thread_info.h>
36 #include <linux/kernel.h>
37 #include <linux/stringify.h>
38 #include <linux/bottom_half.h>
39 #include <asm/barrier.h>
40
41 #include <linux/spinlock_types.h>
42
43 #include <linux/rwlock.h>
44
45 #include <sys/spinlock2.h>
46 #include <sys/lock.h>
47
48 #define spin_is_locked(x) spin_held(x)
49
50 #define assert_spin_locked(x) KKASSERT(lockinuse(x))
51
52 /*
53 * The spin_lock_irq() family of functions stop hardware interrupts
54 * from being delivered to the local CPU.
55 */
spin_lock_irq(spinlock_t * lock)56 static inline void spin_lock_irq(spinlock_t *lock)
57 {
58 local_irq_disable();
59 preempt_disable();
60 lockmgr(lock, LK_EXCLUSIVE);
61 }
62
spin_unlock_irq(spinlock_t * lock)63 static inline void spin_unlock_irq(spinlock_t *lock)
64 {
65 lockmgr(lock, LK_RELEASE);
66 local_irq_enable();
67 preempt_enable();
68 }
69
70 #define spin_lock_irqsave(lock, flags) \
71 ({ \
72 local_irq_save(flags); \
73 preempt_disable(); \
74 lockmgr(lock, LK_EXCLUSIVE); \
75 })
76
77 static inline void
spin_unlock_irqrestore(spinlock_t * lock,unsigned long flags)78 spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
79 {
80 lockmgr(lock, LK_RELEASE);
81 local_irq_restore(flags);
82 preempt_enable();
83 }
84
85 /*
86 XXX: the spin_lock_bh() and spin_unlock_bh() functions are possibly incorrect
87 XXX: see also in_interrupt()
88 */
89 static inline void
spin_lock_bh(struct lock * lock)90 spin_lock_bh(struct lock *lock)
91 {
92 crit_enter();
93 lockmgr(lock, LK_EXCLUSIVE);
94 }
95
96 static inline void
spin_unlock_bh(struct lock * lock)97 spin_unlock_bh(struct lock *lock)
98 {
99 lockmgr(lock, LK_RELEASE);
100 crit_exit();
101 }
102
103 #define DEFINE_SPINLOCK(x) struct lock x = LOCK_INITIALIZER("ds##x", 0, 0)
104
105 #define spin_lock_irqsave_nested(lock, flags, subclass) \
106 spin_lock_irqsave(lock, flags)
107
108 #endif /* _LINUX_SPINLOCK_H_ */
109