97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
/*@}*/
|