1 files changed, 105 insertions, 0 deletions

diff --git a/arch/tile/include/asm/bitops_64.h b/arch/tile/include/asm/bitops_64.h
new file mode 100644
index 000000000000..99615e8d2d8b
--- /dev/null
+++ b/arch/tile/include/asm/bitops_64.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _ASM_TILE_BITOPS_64_H
+#define _ASM_TILE_BITOPS_64_H
+
+#include <linux/compiler.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+
+/* See <asm/bitops.h> for API comments. */
+
+static inline void set_bit(unsigned nr, volatile unsigned long *addr)
+{
+        unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+        __insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
+}
+
+static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
+{
+        unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+        __insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
+}
+
+#define smp_mb__before_clear_bit()      smp_mb()
+#define smp_mb__after_clear_bit()       smp_mb()
+
+
+static inline void change_bit(unsigned nr, volatile unsigned long *addr)
+{
+        unsigned long old, mask = (1UL << (nr % BITS_PER_LONG));
+        long guess, oldval;
+        addr += nr / BITS_PER_LONG;
+        old = *addr;
+        do {
+                guess = oldval;
+                oldval = atomic64_cmpxchg((atomic64_t *)addr,
+                                          guess, guess ^ mask);
+        } while (guess != oldval);
+}
+
+
+/*
+ * The test_and_xxx_bit() routines require a memory fence before we
+ * start the operation, and after the operation completes.  We use
+ * smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
+ * barrier(), to block until the atomic op is complete.
+ */
+
+static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
+{
+        int val;
+        unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+        smp_mb();  /* barrier for proper semantics */
+        val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
+               & mask) != 0;
+        barrier();
+        return val;
+}
+
+
+static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
+{
+        int val;
+        unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+        smp_mb();  /* barrier for proper semantics */
+        val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
+               & mask) != 0;
+        barrier();
+        return val;
+}
+
+
+static inline int test_and_change_bit(unsigned nr,
+                                      volatile unsigned long *addr)
+{
+        unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+        long guess, oldval = *addr;
+        addr += nr / BITS_PER_LONG;
+        oldval = *addr;
+        do {
+                guess = oldval;
+                oldval = atomic64_cmpxchg((atomic64_t *)addr,
+                                          guess, guess ^ mask);
+        } while (guess != oldval);
+        return (oldval & mask) != 0;
+}
+
+#define ext2_set_bit_atomic(lock, nr, addr)                     \
+        test_and_set_bit((nr), (unsigned long *)(addr))
+#define ext2_clear_bit_atomic(lock, nr, addr)                   \
+        test_and_clear_bit((nr), (unsigned long *)(addr))
+
+#endif /* _ASM_TILE_BITOPS_64_H */