[BSP] Add BSP for Ingenic X1000 CPU

1 files changed, 103 insertions, 0 deletions

diff --git a/libcpu/mips/xburst/stack.c b/libcpu/mips/xburst/stack.c
new file mode 100644
index 0000000000..ceba8b9d9d
--- /dev/null
+++ b/libcpu/mips/xburst/stack.c
@@ -0,0 +1,103 @@
+/*
+ * File      : stack.c
+ * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-05-17     swkyer       first version
+ * 2010-07-07     Bernard      porting to Ingenic CPU
+ */
+#include <rtthread.h>
+
+/**
+ * @addtogroup Ingenic
+ */
+/*@{*/
+
+extern rt_uint32_t cp0_get_cause(void);
+extern rt_uint32_t cp0_get_status(void);
+extern rt_uint32_t cp0_get_hi(void);
+extern rt_uint32_t cp0_get_lo(void);
+
+/**
+ * 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_uint32_t *stk;
+    static rt_uint32_t g_sr = 0;
+
+    if (g_sr == 0)
+    {
+        g_sr = cp0_get_status();
+        g_sr &= 0xfffffffe;
+        g_sr |= 0x0403;
+    }
+
+    /** Start at stack top */
+    stk = (rt_uint32_t *)stack_addr;
+    *(stk)   = (rt_uint32_t) tentry;        /* pc: Entry Point */
+    *(--stk) = (rt_uint32_t) 0xeeee;        /* c0_cause */
+    *(--stk) = (rt_uint32_t) 0xffff;        /* c0_badvaddr */
+    *(--stk) = (rt_uint32_t) cp0_get_lo();  /* lo */
+    *(--stk) = (rt_uint32_t) cp0_get_hi();  /* hi */
+    *(--stk) = (rt_uint32_t) g_sr;          /* C0_SR: HW2 = En, IE = En */
+    *(--stk) = (rt_uint32_t) texit;         /* ra */
+    *(--stk) = (rt_uint32_t) 0x0000001e;    /* s8 */
+    *(--stk) = (rt_uint32_t) stack_addr;    /* sp */
+    *(--stk) = (rt_uint32_t) 0x0000001c;    /* gp */
+    *(--stk) = (rt_uint32_t) 0x0000001b;    /* k1 */
+    *(--stk) = (rt_uint32_t) 0x0000001a;    /* k0 */
+    *(--stk) = (rt_uint32_t) 0x00000019;    /* t9 */
+    *(--stk) = (rt_uint32_t) 0x00000018;    /* t8 */
+    *(--stk) = (rt_uint32_t) 0x00000017;    /* s7 */
+    *(--stk) = (rt_uint32_t) 0x00000016;    /* s6 */
+    *(--stk) = (rt_uint32_t) 0x00000015;    /* s5 */
+    *(--stk) = (rt_uint32_t) 0x00000014;    /* s4 */
+    *(--stk) = (rt_uint32_t) 0x00000013;    /* s3 */
+    *(--stk) = (rt_uint32_t) 0x00000012;    /* s2 */
+    *(--stk) = (rt_uint32_t) 0x00000011;    /* s1 */
+    *(--stk) = (rt_uint32_t) 0x00000010;    /* s0 */
+    *(--stk) = (rt_uint32_t) 0x0000000f;    /* t7 */
+    *(--stk) = (rt_uint32_t) 0x0000000e;    /* t6 */
+    *(--stk) = (rt_uint32_t) 0x0000000d;    /* t5 */
+    *(--stk) = (rt_uint32_t) 0x0000000c;    /* t4 */
+    *(--stk) = (rt_uint32_t) 0x0000000b;    /* t3 */
+    *(--stk) = (rt_uint32_t) 0x0000000a;    /* t2 */
+    *(--stk) = (rt_uint32_t) 0x00000009;    /* t1 */
+    *(--stk) = (rt_uint32_t) 0x00000008;    /* t0 */
+    *(--stk) = (rt_uint32_t) 0x00000007;    /* a3 */
+    *(--stk) = (rt_uint32_t) 0x00000006;    /* a2 */
+    *(--stk) = (rt_uint32_t) 0x00000005;    /* a1 */
+    *(--stk) = (rt_uint32_t) parameter;     /* a0 */
+    *(--stk) = (rt_uint32_t) 0x00000003;    /* v1 */
+    *(--stk) = (rt_uint32_t) 0x00000002;    /* v0 */
+    *(--stk) = (rt_uint32_t) 0x00000001;    /* at */
+    *(--stk) = (rt_uint32_t) 0x00000000;    /* zero */
+
+    /* return task's current stack address */
+    return (rt_uint8_t *)stk;
+}
+
+/*@}*/