1 files changed, 86 insertions, 0 deletions
diff --git a/ports/sysdeps/am33/atomicity.h b/ports/sysdeps/am33/atomicity.h
new file mode 100644
index 0000000000..b0ba43db4b
--- /dev/null
+++ b/ports/sysdeps/am33/atomicity.h
@@ -0,0 +1,86 @@
+/* Low-level functions for atomic operations.  AM33 version.
+   Copyright 1999, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Alexandre Oliva <aoliva@redhat.com>.
+   Based on ../sparc/sparc32/atomicity.h
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _ATOMICITY_H
+#define _ATOMICITY_H	1
+
+#include <inttypes.h>
+
+#define __acquire_lock(lock) \
+  __asm__ __volatile__("1:	bset	%1, (%0)\n\t"		\
+		       "	beq	1b"			\
+		       : : "a" (&(lock)), "d" (1)		\
+		       : "memory")
+
+#define __release_lock(lock) lock = 0
+
+static int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+  static unsigned char lock;
+  int result;
+
+  __acquire_lock (lock);
+
+  result = *mem;
+  *mem += val;
+
+  __release_lock (lock);
+
+  return result;
+}
+
+static void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  static unsigned char lock;
+
+  __acquire_lock (lock);
+
+  *mem += val;
+
+  __release_lock (lock);
+}
+
+static int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  static unsigned char lock;
+  int ret;
+
+  __acquire_lock (lock);
+
+  if (*p != oldval)
+    ret = 0;
+  else
+    {
+      *p = newval;
+      ret = 1;
+    }
+
+  __release_lock (lock);
+
+  return ret;
+}
+
+#endif /* atomicity.h */