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>
11 /* The following has to match the LWS code in syscall.S. We have
12 sixteen four-word locks. */
15 _futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags)
17 extern u32 lws_lock_start[];
18 long index = ((long)uaddr & 0xf0) >> 2;
19 arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
20 local_irq_save(*flags);
25 _futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags)
27 extern u32 lws_lock_start[];
28 long index = ((long)uaddr & 0xf0) >> 2;
29 arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
31 local_irq_restore(*flags);
35 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
37 unsigned long int flags;
41 _futex_spin_lock_irqsave(uaddr, &flags);
45 if (unlikely(get_user(oldval, uaddr) != 0))
46 goto out_pagefault_enable;
71 if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
76 _futex_spin_unlock_irqrestore(uaddr, &flags);
85 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
86 u32 oldval, u32 newval)
91 /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
92 * our gateway page, and causes no end of trouble...
94 if (uaccess_kernel() && !uaddr)
97 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
100 /* HPPA has no cmpxchg in hardware and therefore the
101 * best we can do here is use an array of locks. The
102 * lock selected is based on a hash of the userspace
103 * address. This should scale to a couple of CPUs.
106 _futex_spin_lock_irqsave(uaddr, &flags);
107 if (unlikely(get_user(val, uaddr) != 0)) {
108 _futex_spin_unlock_irqrestore(uaddr, &flags);
112 if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) {
113 _futex_spin_unlock_irqrestore(uaddr, &flags);
118 _futex_spin_unlock_irqrestore(uaddr, &flags);
123 #endif /*__KERNEL__*/
124 #endif /*_ASM_PARISC_FUTEX_H*/