Add a 00-INDEX file to Documentation/mips/
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / asm-parisc / futex.h
blobdbee6e60aa8139e66897ba65ba4ac9155bf00dab
1 #ifndef _ASM_PARISC_FUTEX_H
2 #define _ASM_PARISC_FUTEX_H
4 #ifdef __KERNEL__
6 #include <linux/futex.h>
7 #include <asm/errno.h>
8 #include <asm/uaccess.h>
10 static inline int
11 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
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;
21 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
22 return -EFAULT;
24 pagefault_disable();
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;
36 pagefault_enable();
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;
49 return ret;
52 /* Non-atomic version */
53 static inline int
54 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
56 int err = 0;
57 int uval;
59 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
60 return -EFAULT;
62 err = get_user(uval, uaddr);
63 if (err) return -EFAULT;
64 if (uval == oldval)
65 err = put_user(newval, uaddr);
66 if (err) return -EFAULT;
67 return uval;
70 #endif
71 #endif