From 0c1371139684af526c05eee22ff337149332bd2c Mon Sep 17 00:00:00 2001
From: "bernard.xiong" <bernard.xiong@gmail.com>
Date: Sun, 14 Oct 2012 23:28:37 +0000
Subject: Add taihu bsp (PPC405)

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2350 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 libcpu/ppc/common/stack.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 libcpu/ppc/common/stack.c

(limited to 'libcpu/ppc/common/stack.c')

diff --git a/libcpu/ppc/common/stack.c b/libcpu/ppc/common/stack.c
new file mode 100644
index 0000000000..05ae5abb80
--- /dev/null
+++ b/libcpu/ppc/common/stack.c
@@ -0,0 +1,88 @@
+/*
+ * File      : stack.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006-2011, 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://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2011-02-14     Fred         first implementation for 
+ */
+
+#include <rtthread.h>
+
+/**
+ * @addtogroup PowerPC
+ */
+/*@{*/
+
+/**
+ * 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;
+    rt_uint32_t msr;
+
+    __asm__ __volatile__("mfmsr %0\n" : "=r" (msr));
+    msr |= 0x00028000;
+
+    stk      = (unsigned long *)stack_addr;
+    --stk;
+    *(--stk) = msr;                 /* srr0: machine status register */
+    *(--stk) = (rt_uint32_t)tentry; /* srr1: entry point */
+    *(--stk) = (rt_uint32_t)texit;  /* lr: link register */
+    *(--stk) = 0x0F0F0F0F;          /* ctr: counter register */
+    *(--stk) = 0x0F0F0F0F;          /* xer: fixed-point exception register */
+    *(--stk) = 0x0F0F0F0F;          /* cr : condition register */
+    *(--stk) = 0x00;                /* usprg0 */
+
+    *(--stk) = 0x31;            /* r31 */
+    *(--stk) = 0x30;            /* r30 */
+    *(--stk) = 0x29;            /* r29 */
+    *(--stk) = 0x28;            /* r28 */
+    *(--stk) = 0x27;            /* r27 */
+    *(--stk) = 0x26;            /* r26 */
+    *(--stk) = 0x25;            /* r25 */
+    *(--stk) = 0x24;            /* r24 */
+    *(--stk) = 0x23;            /* r23 */
+    *(--stk) = 0x22;            /* r22 */
+    *(--stk) = 0x21;            /* r21 */
+    *(--stk) = 0x20;            /* r20 */
+    *(--stk) = 0x19;            /* r19 */
+    *(--stk) = 0x18;            /* r18 */
+    *(--stk) = 0x17;            /* r17 */
+    *(--stk) = 0x16;            /* r16 */
+    *(--stk) = 0x15;            /* r15 */
+    *(--stk) = 0x14;            /* r14 */
+    *(--stk) = 0x13;            /* r13: thread id */
+    *(--stk) = 0x12;            /* r12 */
+    *(--stk) = 0x11;            /* r11 */
+    *(--stk) = 0x10;            /* r10 */
+    *(--stk) = 0x09;            /* r09 */
+    *(--stk) = 0x08;            /* r08 */
+    *(--stk) = 0x07;            /* r07 */
+    *(--stk) = 0x06;            /* r06 */
+    *(--stk) = 0x05;            /* r05 */
+    *(--stk) = 0x04;            /* r04 */
+    *(--stk) = (rt_uint32_t)parameter;  /* r03: parameter and return  */
+    *(--stk) = 0x02;            /* r02: toc */
+                                /* r01: sp */
+    *(--stk) = 0x0;             /* r00 */
+
+    /* return task's current stack address */
+    return (rt_uint8_t *)stk;
+}
+
+/*@}*/
-- 
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