move libcpu/arm/rm48x50/ to libcpu/arm/cortex-r4

libcpu/arm/cortex-r4/stack.c

@@ -0,0 +1,85 @@
+/*
+ * File      : stack.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://openlab.rt-thread.com/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-12-11     XuXinming    first version
+ * 2013-05-24     Grissiom     port to RM48x50
+ */
+#include <rtthread.h>
+#include "RM48x50.h"
+/**
+ * @addtogroup RM48x50
+ */
+/*@{*/
+
+/**
+ * This function will initialize thread stack
+ *
+ * @param tentry the entry of thread
+ * @param parameter the parameter of entry 
+ * @param stack_addr the beginning stack address
+ * @param texit the function will be called when thread exit
+ *
+ * @return stack address
+ */
+rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
+	rt_uint8_t *stack_addr, void *texit)
+{
+	unsigned long *stk;
+
+	    stk  = (unsigned long*)stack_addr;
+	*(  stk) = (unsigned long) tentry;		/* entry point */
+	*(--stk) = (unsigned long) texit;		/* lr */
+	*(--stk) = 0;							/* r12 */
+	*(--stk) = 0;							/* r11 */
+	*(--stk) = 0;							/* r10 */
+	*(--stk) = 0;							/* r9 */
+	*(--stk) = 0;							/* r8 */
+	*(--stk) = 0;							/* r7 */
+	*(--stk) = 0;							/* r6 */
+	*(--stk) = 0;							/* r5 */
+	*(--stk) = 0;							/* r4 */
+	*(--stk) = 0;							/* r3 */
+	*(--stk) = 0;							/* r2 */
+	*(--stk) = 0;							/* r1 */
+	*(--stk) = (unsigned long)parameter;	/* r0 : argument */
+
+	/* cpsr */
+	if ((rt_uint32_t)tentry & 0x01)
+		*(--stk) = SVCMODE | 0x20;			/* thumb mode */
+	else
+		*(--stk) = SVCMODE;					/* arm mode   */
+
+#ifdef __TI_VFP_SUPPORT__
+#ifndef RT_VFP_LAZY_STACKING
+    {
+        #define VFP_DATA_NR 32
+        int i;
+
+        for (i = 0; i < VFP_DATA_NR; i++)
+        {
+            *(--stk) = 0;
+        }
+        /* FPSCR TODO: do we need to set the values other than 0? */
+        *(--stk) = 0;
+        /* FPEXC. Enable the FVP if no lazy stacking. */
+        *(--stk) = 0x40000000;
+    }
+#else
+        /* FPEXC. Disable the FVP by default. */
+        *(--stk) = 0x00000000;
+#endif
+#endif
+
+	/* return task's current stack address */
+	return (rt_uint8_t *)stk;
+}
+
+/*@}*/