libgloss: bfin: add clear_cache_range support (for gcc)

libgloss/bfin/clear_cache_range.c

@@ -0,0 +1,33 @@
+/*
+ * C library support files for the Blackfin processor
+ *
+ * Copyright (C) 2010 Analog Devices, Inc.
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+/* This is a callback which gcc itself wants to flush jump tables.
+
+   Map it into L1 Text because of anomalies 05-00-0312 and 05-00-0419.  */
+
+__attribute__ ((l1_text))
+void __clear_cache_range (char *beg, char *end)
+{
+  char *ptr = beg;
+  do {
+    __asm__ __volatile__ ("FLUSH [%0++];" : "+a" (ptr) : : "memory");
+  } while (ptr <= end);
+  ptr = beg;
+  __asm__ __volatile__ ("SSYNC;");
+  do {
+    __asm__ __volatile__ ("IFLUSH [%0++];" : "+a" (ptr) : : "memory");
+  } while (ptr <= end);
+}