UbixOS V2 2.0

spinlock.h
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1 /*-
2 * Copyright (c) 2002-2018 The UbixOS Project.
3 * All rights reserved.
4 *
5 * This was developed by Christopher W. Olsen for the UbixOS Project.
6 *
7 * Redistribution and use in source and binary forms, with or without modification, are permitted
8 * provided that the following conditions are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright notice, this list of
11 * conditions, the following disclaimer and the list of authors.
12 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13 * conditions, the following disclaimer and the list of authors in the documentation and/or
14 * other materials provided with the distribution.
15 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16 * endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef _UBIXOS_SPINLOCK_H
30 #define _UBIXOS_SPINLOCK_H
31
32 #include <sys/types.h>
33
34 #define LOCKED 1
35 #define UNLOCKED 0
36 #define SPIN_LOCK_INITIALIZER {NULL, 0}
37 #define LLOCK_FLAG 1
38
39 //typedef volatile int spinLock_t;
40
41 struct spinLock {
42 struct spinLock *next;
43 uint32_t locked;
44 };
45
46 typedef struct spinLock *spinLock_t;
47
48 extern struct spinLock Master;
49
50 void spinLockInit(spinLock_t);
51 void spinUnlock(spinLock_t);
52 int spinTryLock(spinLock_t);
53 void spinLock(spinLock_t);
54
55 void spinLock_scheduler(spinLock_t *); /* Only use this spinlock in the sched. */
56
57 int spinLockLocked(spinLock_t *);
58
59 /* Atomic exchange (of various sizes) */
60 static inline u_long xchg_64(volatile uint32_t *ptr, u_long x) {
61 __asm__ __volatile__("xchgq %1,%0"
62 :"+r" (x),
63 "+m" (*ptr));
64
65 return x;
66 }
67
68 static inline unsigned xchg_32(volatile uint32_t *ptr, uint32_t x) {
69 __asm__ __volatile__("xchgl %1,%0"
70 :"+r" (x),
71 "+m" (*ptr));
72
73 return x;
74 }
75
76 static inline unsigned short xchg_16(volatile uint32_t *ptr, uint16_t x) {
77 __asm__ __volatile__("xchgw %1,%0"
78 :"+r" (x),
79 "+m" (*ptr));
80
81 return x;
82 }
83
84 /* Test and set a bit */
85 static inline char atomic_bitsetandtest(void *ptr, int x) {
86 char out;
87 __asm__ __volatile__("lock; bts %2,%1\n"
88 "sbb %0,%0\n"
89 :"=r" (out), "=m" (*(volatile long long *)ptr)
90 :"Ir" (x)
91 :"memory");
92
93 return out;
94 }
95
96 #endif
u_long
unsigned long u_long
Definition: types.h:73
spinLock_scheduler
void spinLock_scheduler(spinLock_t *)
Definition: spinlock.c:63
spinLock::locked
uint32_t locked
Definition: spinlock.h:43
spinUnlock
void spinUnlock(spinLock_t)
Definition: spinlock.c:59
types.h
spinTryLock
int spinTryLock(spinLock_t)
Definition: spinlock.c:51
spinLockLocked
int spinLockLocked(spinLock_t *)
Definition: spinlock.c:69
Master
struct spinLock Master
Definition: syscall_posix.c:40
uint16_t
__uint16_t uint16_t
Definition: types.h:45
spinLock::next
struct spinLock * next
Definition: spinlock.h:42
uint32_t
__uint32_t uint32_t
Definition: types.h:46
spinLockInit
void spinLockInit(spinLock_t)
Definition: spinlock.c:47
spinLock
Definition: spinlock.h:41
spinLock_t
struct spinLock * spinLock_t
Definition: spinlock.h:46
spinLock
void spinLock(spinLock_t)
Definition: spinlock.c:64