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 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
37 unsigned long int flags;
39 int op = (encoded_op >> 28) & 7;
40 int cmp = (encoded_op >> 24) & 15;
41 int oparg = (encoded_op << 8) >> 20;
42 int cmparg = (encoded_op << 20) >> 20;
44 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
47 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(*uaddr)))
52 _futex_spin_lock_irqsave(uaddr, &flags);
56 /* *(int *)UADDR2 = OPARG; */
57 ret = get_user(oldval, uaddr);
59 ret = put_user(oparg, uaddr);
62 /* *(int *)UADDR2 += OPARG; */
63 ret = get_user(oldval, uaddr);
66 ret = put_user(val, uaddr);
70 /* *(int *)UADDR2 |= OPARG; */
71 ret = get_user(oldval, uaddr);
74 ret = put_user(val, uaddr);
78 /* *(int *)UADDR2 &= ~OPARG; */
79 ret = get_user(oldval, uaddr);
81 val = oldval & ~oparg;
82 ret = put_user(val, uaddr);
86 /* *(int *)UADDR2 ^= OPARG; */
87 ret = get_user(oldval, uaddr);
90 ret = put_user(val, uaddr);
97 _futex_spin_unlock_irqrestore(uaddr, &flags);
103 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
104 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
105 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
106 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
107 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
108 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
109 default: ret = -ENOSYS;
115 /* Non-atomic version */
117 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
118 u32 oldval, u32 newval)
124 /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
125 * our gateway page, and causes no end of trouble...
127 if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
130 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
133 /* HPPA has no cmpxchg in hardware and therefore the
134 * best we can do here is use an array of locks. The
135 * lock selected is based on a hash of the userspace
136 * address. This should scale to a couple of CPUs.
139 _futex_spin_lock_irqsave(uaddr, &flags);
141 ret = get_user(val, uaddr);
143 if (!ret && val == oldval)
144 ret = put_user(newval, uaddr);
148 _futex_spin_unlock_irqrestore(uaddr, &flags);
153 #endif /*__KERNEL__*/
154 #endif /*_ASM_PARISC_FUTEX_H*/