1 #ifndef _ASM_PARISC_FUTEX_H
2 #define _ASM_PARISC_FUTEX_H
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
8 #include <asm/atomic.h>
12 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
14 unsigned long int flags;
16 int op = (encoded_op >> 28) & 7;
17 int cmp = (encoded_op >> 24) & 15;
18 int oparg = (encoded_op << 8) >> 20;
19 int cmparg = (encoded_op << 20) >> 20;
21 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
24 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(*uaddr)))
29 _atomic_spin_lock_irqsave(uaddr, flags);
33 /* *(int *)UADDR2 = OPARG; */
34 ret = get_user(oldval, uaddr);
36 ret = put_user(oparg, uaddr);
39 /* *(int *)UADDR2 += OPARG; */
40 ret = get_user(oldval, uaddr);
43 ret = put_user(val, uaddr);
47 /* *(int *)UADDR2 |= OPARG; */
48 ret = get_user(oldval, uaddr);
51 ret = put_user(val, uaddr);
55 /* *(int *)UADDR2 &= ~OPARG; */
56 ret = get_user(oldval, uaddr);
58 val = oldval & ~oparg;
59 ret = put_user(val, uaddr);
63 /* *(int *)UADDR2 ^= OPARG; */
64 ret = get_user(oldval, uaddr);
67 ret = put_user(val, uaddr);
74 _atomic_spin_unlock_irqrestore(uaddr, flags);
80 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
81 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
82 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
83 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
84 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
85 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
86 default: ret = -ENOSYS;
92 /* Non-atomic version */
94 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
95 u32 oldval, u32 newval)
101 /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
102 * our gateway page, and causes no end of trouble...
104 if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
107 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
110 /* HPPA has no cmpxchg in hardware and therefore the
111 * best we can do here is use an array of locks. The
112 * lock selected is based on a hash of the userspace
113 * address. This should scale to a couple of CPUs.
116 _atomic_spin_lock_irqsave(uaddr, flags);
118 ret = get_user(val, uaddr);
120 if (!ret && val == oldval)
121 ret = put_user(newval, uaddr);
125 _atomic_spin_unlock_irqrestore(uaddr, flags);
130 #endif /*__KERNEL__*/
131 #endif /*_ASM_PARISC_FUTEX_H*/