--- /dev/null
+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.com>
+ *
+ * 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 of the License.
+ *
+ * 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. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao.h"
+
+void
+_ao_xmemcpy(__xdata uint8_t *dst, __xdata uint8_t *src, uint8_t count)
+{
+ while (count--)
+ *dst++ = *src++;
+}
+
+void
+_ao_xmemset(__xdata uint8_t *dst, uint8_t v, uint8_t count)
+{
+ while (count--)
+ *dst++ = v;
+}
+
+int8_t
+_ao_xmemcmp(__xdata uint8_t *a, __xdata uint8_t *b, uint8_t count)
+{
+ while (count--) {
+ int8_t d = *a++ - *b++;
+ if (d)
+ return d;
+ }
+ return 0;
+}