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- /*
- * File : cpuport.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2009 - 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
- * 20011-05-23 aozima the first version for PIC32.
- * 20011-09-05 aozima merge all of C source code into cpuport.c.
- */
- #include <rtthread.h>
- /**
- * @addtogroup PIC32
- */
- /*@{*/
- /* exception and interrupt handler table */
- rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
- rt_uint32_t rt_thread_switch_interrupt_flag;
- rt_uint32_t __attribute__((nomips16)) _get_gp(void)
- {
- rt_uint32_t result;
- // get the gp reg
- asm volatile("move %0, $28" : "=r"(result));
- return result;
- }
- /**
- * 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;
- /** Start at stack top */
- stk = (rt_uint32_t *)stack_addr;
- *(stk) = (rt_uint32_t) tentry; /* pc: Entry Point */
- *(--stk) = (rt_uint32_t) 0x00800000; /* c0_cause: IV=1, */
- *(--stk) = (rt_uint32_t) 0; /* c0_badvaddr */
- *(--stk) = (rt_uint32_t) 0; /* lo */
- *(--stk) = (rt_uint32_t) 0; /* hi */
- *(--stk) = (rt_uint32_t) 1; /* C0_SR: IE = En, */
- *(--stk) = (rt_uint32_t) texit; /* 31 ra */
- *(--stk) = (rt_uint32_t) 0x0000001e; /* 30 s8 */
- *(--stk) = (rt_uint32_t) stack_addr; /* 29 sp */
- *(--stk) = (rt_uint32_t) _get_gp(); /* 28 gp */
- *(--stk) = (rt_uint32_t) 0x0000001b; /* 27 k1 */
- *(--stk) = (rt_uint32_t) 0x0000001a; /* 26 k0 */
- *(--stk) = (rt_uint32_t) 0x00000019; /* 25 t9 */
- *(--stk) = (rt_uint32_t) 0x00000018; /* 24 t8 */
- *(--stk) = (rt_uint32_t) 0x00000017; /* 23 s7 */
- *(--stk) = (rt_uint32_t) 0x00000016; /* 22 s6 */
- *(--stk) = (rt_uint32_t) 0x00000015; /* 21 s5 */
- *(--stk) = (rt_uint32_t) 0x00000014; /* 20 s4 */
- *(--stk) = (rt_uint32_t) 0x00000013; /* 19 s3 */
- *(--stk) = (rt_uint32_t) 0x00000012; /* 18 s2 */
- *(--stk) = (rt_uint32_t) 0x00000011; /* 17 s1 */
- *(--stk) = (rt_uint32_t) 0x00000010; /* 16 s0 */
- *(--stk) = (rt_uint32_t) 0x0000000f; /* 15 t7 */
- *(--stk) = (rt_uint32_t) 0x0000000e; /* 14 t6 */
- *(--stk) = (rt_uint32_t) 0x0000000d; /* 13 t5 */
- *(--stk) = (rt_uint32_t) 0x0000000c; /* 12 t4 */
- *(--stk) = (rt_uint32_t) 0x0000000b; /* 11 t3 */
- *(--stk) = (rt_uint32_t) 0x0000000a; /* 10 t2 */
- *(--stk) = (rt_uint32_t) 0x00000009; /* 9 t1 */
- *(--stk) = (rt_uint32_t) 0x00000008; /* 8 t0 */
- *(--stk) = (rt_uint32_t) 0x00000007; /* 7 a3 */
- *(--stk) = (rt_uint32_t) 0x00000006; /* 6 a2 */
- *(--stk) = (rt_uint32_t) 0x00000005; /* 5 a1 */
- *(--stk) = (rt_uint32_t) parameter; /* 4 a0 */
- *(--stk) = (rt_uint32_t) 0x00000003; /* 3 v1 */
- *(--stk) = (rt_uint32_t) 0x00000002; /* 2 v0 */
- *(--stk) = (rt_uint32_t) 0x00000001; /* 1 at */
- *(--stk) = (rt_uint32_t) 0x00000000; /* 0 zero */
- /* return task's current stack address */
- return (rt_uint8_t *)stk;
- }
- /*@}*/
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