1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#ifndef _ASM_X86_RWLOCK_H
#define _ASM_X86_RWLOCK_H
#include <asm/asm.h>
#if CONFIG_NR_CPUS <= 2048
#ifndef __ASSEMBLY__
typedef union {
s32 lock;
s32 write;
} arch_rwlock_t;
#endif
#define RW_LOCK_BIAS 0x00100000
#define READ_LOCK_SIZE(insn) __ASM_FORM(insn##l)
#define READ_LOCK_ATOMIC(n) atomic_##n
#define WRITE_LOCK_ADD(n) __ASM_FORM_COMMA(addl n)
#define WRITE_LOCK_SUB(n) __ASM_FORM_COMMA(subl n)
#define WRITE_LOCK_CMP RW_LOCK_BIAS
#else /* CONFIG_NR_CPUS > 2048 */
#include <linux/const.h>
#ifndef __ASSEMBLY__
typedef union {
s64 lock;
struct {
u32 read;
s32 write;
};
} arch_rwlock_t;
#endif
#define RW_LOCK_BIAS (_AC(1,L) << 32)
#define READ_LOCK_SIZE(insn) __ASM_FORM(insn##q)
#define READ_LOCK_ATOMIC(n) atomic64_##n
#define WRITE_LOCK_ADD(n) __ASM_FORM(incl)
#define WRITE_LOCK_SUB(n) __ASM_FORM(decl)
#define WRITE_LOCK_CMP 1
#endif /* CONFIG_NR_CPUS */
#define __ARCH_RW_LOCK_UNLOCKED { RW_LOCK_BIAS }
/* Actual code is in asm/spinlock.h or in arch/x86/lib/rwlock.S */
#endif /* _ASM_X86_RWLOCK_H */
|
