text: #ifndef _ASM_FUTEX_H
  #define _ASM_FUTEX_H
  
  #ifdef __KERNEL__
  
  #include <linux/futex.h>
  #include <asm/errno.h>
  #include <asm/system.h>
  #include <asm/processor.h>
  #include <asm/uaccess.h>
  
  #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
    __asm__ __volatile (						\
  "1:	" insn "\n"						\
  "2:	.section .fixup,\"ax\"\n\
  3:	mov	%3, %1\n\
  	jmp	2b\n\
  	.previous\n\
  	.section __ex_table,\"a\"\n\
  	.align	8\n\
  	.long	1b,3b\n\
  	.previous"						\
  	: "=r" (oldval), "=r" (ret), "=m" (*uaddr)		\
  	: "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
  
  #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
    __asm__ __volatile (						\
  "1:	movl	%2, %0\n\
  	movl	%0, %3\n"					\
  	insn "\n"						\
  "2:	" LOCK_PREFIX "cmpxchgl %3, %2\n\
  	jnz	1b\n\
  3:	.section .fixup,\"ax\"\n\
  4:	mov	%5, %1\n\
  	jmp	3b\n\
  	.previous\n\
  	.section __ex_table,\"a\"\n\
  	.align	8\n\
  	.long	1b,4b,2b,4b\n\
  	.previous"						\
  	: "=&a" (oldval), "=&r" (ret), "=m" (*uaddr),		\
  	  "=&r" (tem)						\
  	: "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
  
  static inline int
  futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
  {
  	int op = (encoded_op >> 28) & 7;
  	int cmp = (encoded_op >> 24) & 15;
  	int oparg = (encoded_op << 8) >> 20;
  	int cmparg = (encoded_op << 20) >> 20;
  	int oldval = 0, ret, tem;
  	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  		oparg = 1 << oparg;
  
  	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
  		return -EFAULT;
  
  	inc_preempt_count();
  
  	if (op == FUTEX_OP_SET)
  		__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
  	else {
  #ifndef CONFIG_X86_BSWAP
  		if (boot_cpu_data.x86 == 3)
  			ret = -ENOSYS;
  		else
  #endif
  		switch (op) {
  		case FUTEX_OP_ADD:
  			__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret,
  					   oldval, uaddr, oparg);
  			break;
  		case FUTEX_OP_OR:
  			__futex_atomic_op2("orl %4, %3", ret, oldval, uaddr,
  					   oparg);
  			break;
  		case FUTEX_OP_ANDN:
  			__futex_atomic_op2("andl %4, %3", ret, oldval, uaddr,
  					   ~oparg);
  			break;
  		case FUTEX_OP_XOR:
  			__futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr,
  					   oparg);
  			break;
  		default:
  			ret = -ENOSYS;
  		}
  	}
  
  	dec_preempt_count();
  
  	if (!ret) {
  		switch (cmp) {
  		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
  		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
  		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
  		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
  		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
  		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
  		default: ret = -ENOSYS;
  		}
  	}
  	return ret;
  }
  
  #endif
  #endif
  