rtems: Move rtems_cache_aligned_malloc()

Make sure also the size is cache aligned since otherwise we may have
some overlap with the next allocation block.  A cache invalidate on this
area would be fatal.

cpukit/libcsupport/Makefile.am

@@ -108,6 +108,7 @@ MALLOC_C_FILES = src/malloc_initialize.c src/calloc.c src/malloc.c \
     src/rtems_heap_null_extend.c \
     src/rtems_heap_extend.c \
     src/rtems_heap_greedy.c
+MALLOC_C_FILES += src/cachealignedalloc.c
 
 PASSWORD_GROUP_C_FILES = src/pwdgrp.c
 PASSWORD_GROUP_C_FILES += src/getgrent.c

cpukit/libcsupport/src/cachealignedalloc.c

@@ -0,0 +1,28 @@
+/*
+ *  RTEMS Cache Aligned Malloc
+ *
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems.h>
+#include <rtems/malloc.h>
+
+void *rtems_cache_aligned_malloc( size_t nbytes )
+{
+  size_t line_size = rtems_cache_get_data_line_size();
+
+  if ( line_size > 0 ) {
+    /* Assume that the cache line size is a power of two */
+    size_t m = line_size - 1;
+
+    nbytes = (nbytes + m) & ~m;
+  }
+
+  return rtems_heap_allocate_aligned_with_boundary( nbytes, line_size, 0 );
+}