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