50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
#ifndef _ASM_X86_RWLOCK_H
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#define _ASM_X86_RWLOCK_H
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#include <asm/asm.h>
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#if CONFIG_NR_CPUS <= 2048
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#ifndef __ASSEMBLY__
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typedef union {
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s32 lock;
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s32 write;
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} arch_rwlock_t;
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#endif
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#define RW_LOCK_BIAS 0x00100000
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#define READ_LOCK_SIZE(insn) __ASM_FORM(insn##l)
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#define READ_LOCK_ATOMIC(n) atomic_##n
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#define WRITE_LOCK_ADD(n) __ASM_FORM_COMMA(addl n)
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#define WRITE_LOCK_SUB(n) __ASM_FORM_COMMA(subl n)
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#define WRITE_LOCK_CMP RW_LOCK_BIAS
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#else /* CONFIG_NR_CPUS > 2048 */
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#include <linux/const.h>
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#ifndef __ASSEMBLY__
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typedef union {
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s64 lock;
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struct {
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u32 read;
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s32 write;
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};
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} arch_rwlock_t;
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#endif
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#define RW_LOCK_BIAS (_AC(1,L) << 32)
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#define READ_LOCK_SIZE(insn) __ASM_FORM(insn##q)
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#define READ_LOCK_ATOMIC(n) atomic64_##n
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#define WRITE_LOCK_ADD(n) __ASM_FORM(incl)
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#define WRITE_LOCK_SUB(n) __ASM_FORM(decl)
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#define WRITE_LOCK_CMP 1
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#endif /* CONFIG_NR_CPUS */
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#define __ARCH_RW_LOCK_UNLOCKED { RW_LOCK_BIAS }
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/* Actual code is in asm/spinlock.h or in arch/x86/lib/rwlock.S */
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#endif /* _ASM_X86_RWLOCK_H */
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