From 8b301eb075a3c374d83efed66debec859e2139b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gero=20M=C3=BCller?= <post@geromueller.de>
Date: Sat, 23 Mar 2019 10:40:52 +0100
Subject: [PATCH] add api

---
 sys/checkpoint/Makefile |  1 +
 sys/checkpoint/sytare.c | 71 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 sys/checkpoint/Makefile
 create mode 100644 sys/checkpoint/sytare.c

diff --git a/sys/checkpoint/Makefile b/sys/checkpoint/Makefile
new file mode 100644
index 000000000000..48422e909a47
--- /dev/null
+++ b/sys/checkpoint/Makefile
@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base
diff --git a/sys/checkpoint/sytare.c b/sys/checkpoint/sytare.c
new file mode 100644
index 000000000000..ca13c7738d8f
--- /dev/null
+++ b/sys/checkpoint/sytare.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2018 INRIA
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     sys
+ * @ingroup     sys_sytare
+ * @{
+ *
+ * @file
+ * @brief       Sytare implementation
+ *
+ * @author      Gero Müller <gero.mueller@inria.fr>
+ * @}
+ */
+
+#include "irq.h"
+#include <stdint.h>
+
+/**
+ * @brief   Save all active periphs state
+ * 
+ * @param[out] state    buffer to save the state
+ */
+extern void _sytare_save_periphs_state(uint8_t checkpoint);
+
+/**
+ * @brief   Restore all active periphs state
+ * 
+ * @param[in] state    buffer storing the state
+ */
+extern void _sytare_restore_periphs_state(uint8_t checkpoint);
+
+extern void _sytare_save_ram(uint8_t checkpoint);
+extern void _sytare_restore_ram(uint8_t checkpoint);
+
+// returns the next checkpoint index
+extern uint8_t _sytare_next_checkpoint(void);
+extern uint8_t _sytare_current_checkpoint(void);
+
+// returns the next checkpoint index
+
+void sytare_save(void)
+{
+	unsigned irq_status = irq_disable();
+
+	const uint8_t checkpoint = _sytare_next_checkpoint();
+
+	_sytare_save_periphs_state(checkpoint);
+
+	_sytare_save_ram(checkpoint);
+
+	irq_restore(irq_status);
+}
+
+void sytare_restore(void)
+{
+	unsigned irq_status = irq_disable();
+
+	const uint8_t checkpoint = _sytare_current_checkpoint();
+
+	_sytare_restore_periphs_state(checkpoint);
+
+	_sytare_restore_ram(checkpoint);
+
+	irq_restore(irq_status);
+}