altos/lisp: Append a CRC to the saved image to validate on restore

The CRC is actually of the ROM bits, so we can tell if the restored
image relates to the currently running code.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/lambdakey-v1.0/ao_lisp_os_save.c b/src/lambdakey-v1.0/ao_lisp_os_save.c
new file mode 100644
index 00000000..44138398
--- /dev/null
+++ b/src/lambdakey-v1.0/ao_lisp_os_save.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright © 2016 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <ao.h>
+#include <ao_lisp.h>
+#include <ao_flash.h>
+
+extern uint8_t	__flash__[];
+
+/* saved variables to rebuild the heap
+
+   ao_lisp_atoms
+   ao_lisp_frame_global
+ */
+
+int
+ao_lisp_os_save(void)
+{
+	int i;
+
+	for (i = 0; i < AO_LISP_POOL_TOTAL; i += 256) {
+		uint32_t	*dst = (uint32_t *) &__flash__[i];
+		uint32_t	*src = (uint32_t *) &ao_lisp_pool[i];
+
+		ao_flash_page(dst, src);
+	}
+	return 1;
+}
+
+int
+ao_lisp_os_restore_save(struct ao_lisp_os_save *save, int offset)
+{
+	memcpy(save, &__flash__[offset], sizeof (struct ao_lisp_os_save));
+	return 1;
+}
+
+int
+ao_lisp_os_restore(void)
+{
+	memcpy(ao_lisp_pool, __flash__, AO_LISP_POOL_TOTAL);
+	return 1;
+}