1#ifndef _ASM_GENERIC_FUTEX_H
2#define _ASM_GENERIC_FUTEX_H
3
4#ifdef __KERNEL__
5
6#include <linux/futex.h>
7#include <asm/errno.h>
8#include <asm/uaccess.h>
9
10static inline int
11futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
12{
13	int op = (encoded_op >> 28) & 7;
14	int cmp = (encoded_op >> 24) & 15;
15	int oparg = (encoded_op << 8) >> 20;
16	int cmparg = (encoded_op << 20) >> 20;
17	int oldval = 0, ret;
18	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
19		oparg = 1 << oparg;
20
21	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
22		return -EFAULT;
23
24	pagefault_disable();
25
26	switch (op) {
27	case FUTEX_OP_SET:
28	case FUTEX_OP_ADD:
29	case FUTEX_OP_OR:
30	case FUTEX_OP_ANDN:
31	case FUTEX_OP_XOR:
32	default:
33		ret = -ENOSYS;
34	}
35
36	pagefault_enable();
37
38	if (!ret) {
39		switch (cmp) {
40		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
41		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
42		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
43		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
44		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
45		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
46		default: ret = -ENOSYS;
47		}
48	}
49	return ret;
50}
51
52static inline int
53futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
54{
55	return -ENOSYS;
56}
57
58#endif
59#endif
60