diff options
| author | bernard.xiong <[email protected]> | 2012-10-14 23:28:37 +0000 |
|---|---|---|
| committer | bernard.xiong <[email protected]> | 2012-10-14 23:28:37 +0000 |
| commit | 0c1371139684af526c05eee22ff337149332bd2c (patch) | |
| tree | 60579454b805e888c02d14df26794fee6e1ecc49 /libcpu/ppc/common/stack.c | |
| parent | 8ab10598731740fe9264351108aaf4aa9121074f (diff) | |
Add taihu bsp (PPC405)
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2350 bbd45198-f89e-11dd-88c7-29a3b14d5316
Diffstat (limited to 'libcpu/ppc/common/stack.c')
| -rw-r--r-- | libcpu/ppc/common/stack.c | 88 |
1 files changed, 88 insertions, 0 deletions
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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