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locks.h

Revision 1995, 1.0 KB (checked in by mwhitworth, 3 years ago)
Add BitTestAndClear function.

Line
1	#ifndef LOCKS_H
2	#define LOCKS_H
3
4	#ifndef SMP
5	#define PREFIX_LOCK "lock; "
6	#else
7	#define PREFIX_LOCK ""
8	#endif
9
10	#define ADDR ((volatile long)address)
11
12	static inline int BitTest(volatile void* address, int bit)
13	{
14	int oldBit;
15
16	asm volatile(""
17	"btl %2, %1\n\t"
18	"sbbl %0, %0"
19	: "=r"(oldBit)
20	: "m"(ADDR), "Ir"(bit));
21
22	return oldBit;
23	}
24
25	static inline void BitSet(volatile void* address, int bit)
26	{
27	asm volatile(""
28	"btsl %1, %0"
29	:"+m"(ADDR)
30	:"Ir"(bit));
31	}
32
33	static inline void BitClear(volatile void* address, int bit)
34	{
35	asm volatile(""
36	"btrl %1, %0"
37	:"+m"(ADDR)
38	:"Ir"(bit));
39	}
40
41	static inline int BitTestAndSet(volatile void* address, int bit)
42	{
43	int oldBit;
44
45	asm volatile(""
46	"btsl %2, %1\n\t"
47	"sbbl %0, %0"
48	:"=r"(oldBit), "=m"(ADDR)
49	:"ir"(bit) : "memory");
50
51	return oldBit;
52	}
53
54	static inline int BitTestAndClear(volatile void* address, int bit)
55	{
56	int oldBit;
57
58	asm volatile(""
59	"btr %2, %1\n\t"
60	"sbb %0, %0"
61	: "=r"(oldBit), "=m"(ADDR)
62	: "Ir"(bit) : "memory");
63
64	return oldBit;
65	}
66
67	#endif

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