rt-thread/libcpu/mips/pic32/cpuport.c

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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;
}
/*@}*/