1 files changed, 103 insertions, 0 deletions
diff --git a/os/common/ports/MSP430X/chcore.c b/os/common/ports/MSP430X/chcore.c
new file mode 100644
index 0000000..4e09b8f
--- /dev/null
+++ b/os/common/ports/MSP430X/chcore.c
@@ -0,0 +1,103 @@
+/*
+    ChibiOS/HAL - Copyright (C) 2016 Andrew Wygle aka awygle
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    MSP430X/nilcore.c
+ * @brief   MSP430X port code.
+ *
+ * @addtogroup MSP430X_CORE
+ * @{
+ */
+
+#include "ch.h"
+
+/*===========================================================================*/
+/* Module local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module local types.                                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module local variables.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Performs a context switch between two threads.
+ * @details This is the most critical code in any port, this function
+ *          is responsible for the context switch between 2 threads.
+ * @note    The implementation of this code affects <b>directly</b> the context
+ *          switch performance so optimize here as much as you can.
+ *
+ * @param[in] ntp       the thread to be switched in
+ * @param[in] otp       the thread to be switched out
+ */
+#if !defined(__DOXYGEN__) && defined(__OPTIMIZE__)
+__attribute__((naked))
+#endif
+void _port_switch(thread_t *ntp, thread_t *otp) {
+#if !defined(__OPTIMIZE__)
+  asm volatile ("add #4, r1");
+#endif
+  (void)(ntp);
+  (void)(otp);
+#if defined(__MSP430X_LARGE__)
+  asm volatile ("pushm.a #7, R10");
+  asm volatile ("mova r1, @R13");
+  asm volatile ("mova @R12, r1");
+  asm volatile ("popm.a #7, R10");
+  asm volatile ("reta");
+#else
+  asm volatile ("pushm.w #7, R10");
+  asm volatile ("mov r1, @R13");
+  asm volatile ("mov @R12, r1");
+  asm volatile ("popm.w #7, R10");
+  asm volatile ("ret");
+#endif
+}
+
+/**
+ * @brief   Start a thread by invoking its work function.
+ * @details If the work function returns @p chThdExit() is automatically
+ *          invoked.
+ */
+void _port_thread_start(void) {
+  
+  /* See PORT_SETUP_CONTEXT in nilcore.h */
+  chSysUnlock();
+#if defined(__MSP430X_LARGE__)
+  asm volatile ("mova R5, R12");
+  asm volatile ("calla R4");
+#else
+  asm volatile ("mov R5, R12");
+  asm volatile ("call R4");
+#endif
+  chSysHalt(0);
+}
+/** @} */