add new bsp tms320c6678

原始提交PR：https://gitee.com/rtthread/rt-thread/pulls/372
提交者：https://gitee.com/wei-handong

----------------------

在TI公司C6000 DSP处理器上成功移植rt-thread操作系统；主要在libcpu/ti-dsp/c6x添加keystone架构底层代码，在bsp/ti-c6678添加bsp工程，该工程已在本人的开发板上成功运行

* 添加TMS320C6678处理器，keystone架构底层代码

* 添加支持中断栈部分代码，修改格式

* 修改汇编rt_hw_context_switch_to处关于时间槽的使用；修改格式

* 修改使用C语言构建任务栈帧，清除fls和ffs对<c6x.h>文件的依赖

* 修改bsp tms320c6678工程，并测试

* 删除依赖TI的KeyStone_common.c文件

* 添加编译说明

* update bsp/ti-tms320c6678/README.md.

* format code

Co-authored-by: Huang bo <[email protected]>
Co-authored-by: hdwei <[email protected]>
Co-authored-by: bernard <[email protected]>
Co-authored-by: rtthread-bot <[email protected]>
Co-authored-by: Meco Man <[email protected]>

1 files changed, 120 insertions, 0 deletions

diff --git a/libcpu/ti-dsp/c6x/stack.c b/libcpu/ti-dsp/c6x/stack.c
new file mode 100644
index 0000000000..05e9534538
--- /dev/null
+++ b/libcpu/ti-dsp/c6x/stack.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2021, Shenzhen Academy of Aerospace Technology
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-11-16     Dystopia     the first version
+ */
+
+#include <rtthread.h>
+#include <c66xx.h>
+
+extern rt_uint32_t rt_hw_get_current_dp(void);
+
+/**
+ * @addtogroup C66xx
+ */
+/*@{*/
+
+/**
+ * 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)
+{
+    rt_hw_thread_stack_register *thread_context = RT_NULL;
+    rt_uint32_t stk = 0;
+
+    stack_addr += sizeof(rt_uint32_t);
+    stack_addr  = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);
+    stk         = (rt_uint32_t)stack_addr;
+    thread_context = (rt_hw_thread_stack_register *)(stk - sizeof(rt_hw_thread_stack_register));
+
+    thread_context->pc = (rt_uint32_t)tentry;
+    thread_context->csr = 0x0103;
+    thread_context->tsr = 0x3;
+    thread_context->orig_a4 = 1;
+    thread_context->ilc = 0;
+    thread_context->rilc = 0;
+
+    thread_context->hw_register.b17 = 0xB17;
+    thread_context->hw_register.b16  = 0xB16;
+    thread_context->hw_register.b19  = 0xB19;
+    thread_context->hw_register.b18  = 0xB18;
+    thread_context->hw_register.b21  = 0xB21;
+    thread_context->hw_register.b20  = 0xB20;
+    thread_context->hw_register.b23  = 0xB23;
+    thread_context->hw_register.b22  = 0xB22;
+    thread_context->hw_register.b25  = 0xB25;
+    thread_context->hw_register.b24  = 0xB24;
+    thread_context->hw_register.b27  = 0xB27;
+    thread_context->hw_register.b26  = 0xB26;
+    thread_context->hw_register.b29  = 0xB29;
+    thread_context->hw_register.b28  = 0xB28;
+    thread_context->hw_register.b31  = 0xB31;
+    thread_context->hw_register.b30  = 0xB30;
+
+    thread_context->hw_register.b1  = 0xB01;
+    thread_context->hw_register.b0  = 0xB00;
+    thread_context->hw_register.b3  = (rt_uint32_t)texit;
+    thread_context->hw_register.b2  = 0xB02;
+    thread_context->hw_register.b5  = 0xB05;
+    thread_context->hw_register.b4  = 0xB04;
+    thread_context->hw_register.b7  = 0xB07;
+    thread_context->hw_register.b6  = 0xB06;
+    thread_context->hw_register.b9  = 0xB09;
+    thread_context->hw_register.b8  = 0xB08;
+    thread_context->hw_register.b11  = 0xB11;
+    thread_context->hw_register.b10  = 0xB10;
+    thread_context->hw_register.b13  = 0xB13;
+    thread_context->hw_register.b12  = 0xB12;
+
+    thread_context->hw_register.a17  = 0xA17;
+    thread_context->hw_register.a16  = 0xA16;
+    thread_context->hw_register.a19  = 0xA19;
+    thread_context->hw_register.a18  = 0xA18;
+    thread_context->hw_register.a21  = 0xA21;
+    thread_context->hw_register.a20  = 0xA20;
+    thread_context->hw_register.a23  = 0xA23;
+    thread_context->hw_register.a22  = 0xA22;
+    thread_context->hw_register.a25  = 0xA25;
+    thread_context->hw_register.a24  = 0xA24;
+    thread_context->hw_register.a27  = 0xA27;
+    thread_context->hw_register.a26  = 0xA26;
+    thread_context->hw_register.a29  = 0xA29;
+    thread_context->hw_register.a28  = 0xA28;
+    thread_context->hw_register.a31  = 0xA31;
+    thread_context->hw_register.a30  = 0xA30;
+
+    thread_context->hw_register.a1  = 0xA01;
+    thread_context->hw_register.a0  = 0xA00;
+    thread_context->hw_register.a3  = 0xA03;
+    thread_context->hw_register.a2  = 0xA02;
+    thread_context->hw_register.a5  = 0xA05;
+    thread_context->hw_register.a4  = (rt_uint32_t)parameter;
+    thread_context->hw_register.a7  = 0xA07;
+    thread_context->hw_register.a6  = 0xA06;
+    thread_context->hw_register.a9  = 0xA09;
+    thread_context->hw_register.a8  = 0xA08;
+    thread_context->hw_register.a11  = 0xA11;
+    thread_context->hw_register.a10  = 0xA10;
+    thread_context->hw_register.a13  = 0xA13;
+    thread_context->hw_register.a12  = 0xA12;
+
+    thread_context->hw_register.a15  = 0xA15;
+    thread_context->hw_register.a14  = 0xA14;
+    thread_context->hw_register.dp  = rt_hw_get_current_dp();
+    thread_context->hw_register.sp  = (rt_uint32_t)stk;
+
+    /* return task's current stack address */
+    return (rt_uint8_t *)thread_context - 8;
+}