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Filename/usr/src/linux-headers-3.13.0-24/arch/x86/include/asm/rwlock.h
Size1.02 kb
Permissionrw-r--r--
Ownerroot : root
Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed27-Apr-2025 09:50
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#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 */