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Project/Src/rt-thread/libcpu/xilinx/microblaze/stack.c

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+/*
+ * 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
+ * 2011-12-17     nl1031       first implementation for MicroBlaze.
+ *
+ */
+#include <rtthread.h>
+extern   void  *_SDA_BASE_;
+extern   void  *_SDA2_BASE_;
+
+
+
+/**
+ * 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--;
+	stk--;
+	*stk-- = 0;								/* r31 */
+	*stk-- = 0;								/* r30 */
+	*stk-- = 0;								/* r29 */
+	*stk-- = 0;								/* r28 */
+	*stk-- = 0;								/* r27 */
+	*stk-- = 0;								/* r26 */
+	*stk-- = 0;								/* r25 */
+	*stk-- = 0;								/* r24 */
+	*stk-- = 0;								/* r23 */
+	*stk-- = 0;								/* r22 */
+	*stk-- = 0;								/* r21 */
+	*stk-- = 0;								/* r20 */
+	*stk-- = 0;								/* r19 */
+	*stk-- = 0;								/* r18 */
+	*stk-- = 0;								/* r17 */
+	*stk-- = (unsigned long)texit - 8;		/* r15 = task return address*/
+	*stk-- = (unsigned long)tentry;		/* r14 = entry address*/
+	*stk-- = (unsigned long)&_SDA_BASE_;	/* r13 */
+	*stk-- = 0;								/* r12 */
+	*stk-- = 0;								/* r11 */
+	*stk-- = 0;								/* r10 */
+	*stk-- = 0;								/* r09 */
+	*stk-- = 0;								/* r08 */
+	*stk-- = 0;								/* r07 */
+	*stk-- = 0;								/* r06 */
+	*stk-- = (unsigned long) parameter;	/* r05 */
+	*stk-- = 0;								/* r04 */
+	*stk-- = 0;								/* r03 */
+	*stk-- = (unsigned long)&_SDA2_BASE_;	/* r02 */
+	*stk   = 2;   							/* enable interrupt */
+	return (rt_uint8_t *)stk;
+}
+