This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-powerpc / futex.h

diff --git a/include/asm-powerpc/futex.h b/include/asm-powerpc/futex.h
new file mode 100644 (file)
index 0000000..f1b3c00
--- /dev/null
+++ b/include/asm-powerpc/futex.h
@@ -0,0 +1,91 @@
+#ifndef _ASM_POWERPC_FUTEX_H
+#define _ASM_POWERPC_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+#include <asm/errno.h>
+#include <asm/synch.h>
+#include <asm/uaccess.h>
+#include <asm/asm-compat.h>
+
+#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
+  __asm__ __volatile ( \
+       LWSYNC_ON_SMP \
+"1:    lwarx   %0,0,%2\n" \
+       insn \
+       PPC405_ERR77(0, %2) \
+"2:    stwcx.  %1,0,%2\n" \
+       "bne-   1b\n" \
+       "li     %1,0\n" \
+"3:    .section .fixup,\"ax\"\n" \
+"4:    li      %1,%3\n" \
+       "b      3b\n" \
+       ".previous\n" \
+       ".section __ex_table,\"a\"\n" \
+       ".align 3\n" \
+       PPC_LONG "1b,4b,2b,4b\n" \
+       ".previous" \
+       : "=&r" (oldval), "=&r" (ret) \
+       : "b" (uaddr), "i" (-EFAULT), "1" (oparg) \
+       : "cr0", "memory")
+
+static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
+{
+       int op = (encoded_op >> 28) & 7;
+       int cmp = (encoded_op >> 24) & 15;
+       int oparg = (encoded_op << 8) >> 20;
+       int cmparg = (encoded_op << 20) >> 20;
+       int oldval = 0, ret;
+       if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+               oparg = 1 << oparg;
+
+       if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+       inc_preempt_count();
+
+       switch (op) {
+       case FUTEX_OP_SET:
+               __futex_atomic_op("", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_ADD:
+               __futex_atomic_op("add %1,%0,%1\n", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_OR:
+               __futex_atomic_op("or %1,%0,%1\n", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_ANDN:
+               __futex_atomic_op("andc %1,%0,%1\n", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_XOR:
+               __futex_atomic_op("xor %1,%0,%1\n", ret, oldval, uaddr, oparg);
+               break;
+       default:
+               ret = -ENOSYS;
+       }
+
+       dec_preempt_count();
+
+       if (!ret) {
+               switch (cmp) {
+               case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+               case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+               case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+               case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+               case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+               case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+               default: ret = -ENOSYS;
+               }
+       }
+       return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+{
+       return -ENOSYS;
+}
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_FUTEX_H */