rwlock.h

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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 */