97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
/*
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* File : cpuport.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2009 - 2011, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 20011-05-23 aozima the first version for PIC32.
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* 20011-09-05 aozima merge all of C source code into cpuport.c.
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*/
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#include <rtthread.h>
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/**
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* @addtogroup PIC32
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*/
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/*@{*/
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/* exception and interrupt handler table */
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rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
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rt_uint32_t rt_thread_switch_interrupt_flag;
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rt_uint32_t __attribute__((nomips16)) _get_gp(void)
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{
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rt_uint32_t result;
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// get the gp reg
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asm volatile("move %0, $28" : "=r"(result));
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return result;
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}
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/**
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* This function will initialize thread stack
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*
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* @param tentry the entry of thread
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* @param parameter the parameter of entry
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* @param stack_addr the beginning stack address
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* @param texit the function will be called when thread exit
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*
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* @return stack address
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*/
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rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
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{
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rt_uint32_t *stk;
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/** Start at stack top */
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stk = (rt_uint32_t *)stack_addr;
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*(stk) = (rt_uint32_t) tentry; /* pc: Entry Point */
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*(--stk) = (rt_uint32_t) 0x00800000; /* c0_cause: IV=1, */
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*(--stk) = (rt_uint32_t) 0; /* c0_badvaddr */
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*(--stk) = (rt_uint32_t) 0; /* lo */
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*(--stk) = (rt_uint32_t) 0; /* hi */
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*(--stk) = (rt_uint32_t) 1; /* C0_SR: IE = En, */
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*(--stk) = (rt_uint32_t) texit; /* 31 ra */
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*(--stk) = (rt_uint32_t) 0x0000001e; /* 30 s8 */
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*(--stk) = (rt_uint32_t) stack_addr; /* 29 sp */
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*(--stk) = (rt_uint32_t) _get_gp(); /* 28 gp */
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*(--stk) = (rt_uint32_t) 0x0000001b; /* 27 k1 */
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*(--stk) = (rt_uint32_t) 0x0000001a; /* 26 k0 */
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*(--stk) = (rt_uint32_t) 0x00000019; /* 25 t9 */
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*(--stk) = (rt_uint32_t) 0x00000018; /* 24 t8 */
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*(--stk) = (rt_uint32_t) 0x00000017; /* 23 s7 */
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*(--stk) = (rt_uint32_t) 0x00000016; /* 22 s6 */
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*(--stk) = (rt_uint32_t) 0x00000015; /* 21 s5 */
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*(--stk) = (rt_uint32_t) 0x00000014; /* 20 s4 */
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*(--stk) = (rt_uint32_t) 0x00000013; /* 19 s3 */
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*(--stk) = (rt_uint32_t) 0x00000012; /* 18 s2 */
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*(--stk) = (rt_uint32_t) 0x00000011; /* 17 s1 */
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*(--stk) = (rt_uint32_t) 0x00000010; /* 16 s0 */
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*(--stk) = (rt_uint32_t) 0x0000000f; /* 15 t7 */
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*(--stk) = (rt_uint32_t) 0x0000000e; /* 14 t6 */
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*(--stk) = (rt_uint32_t) 0x0000000d; /* 13 t5 */
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*(--stk) = (rt_uint32_t) 0x0000000c; /* 12 t4 */
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*(--stk) = (rt_uint32_t) 0x0000000b; /* 11 t3 */
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*(--stk) = (rt_uint32_t) 0x0000000a; /* 10 t2 */
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*(--stk) = (rt_uint32_t) 0x00000009; /* 9 t1 */
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*(--stk) = (rt_uint32_t) 0x00000008; /* 8 t0 */
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*(--stk) = (rt_uint32_t) 0x00000007; /* 7 a3 */
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*(--stk) = (rt_uint32_t) 0x00000006; /* 6 a2 */
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*(--stk) = (rt_uint32_t) 0x00000005; /* 5 a1 */
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*(--stk) = (rt_uint32_t) parameter; /* 4 a0 */
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*(--stk) = (rt_uint32_t) 0x00000003; /* 3 v1 */
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*(--stk) = (rt_uint32_t) 0x00000002; /* 2 v0 */
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*(--stk) = (rt_uint32_t) 0x00000001; /* 1 at */
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*(--stk) = (rt_uint32_t) 0x00000000; /* 0 zero */
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/* return task's current stack address */
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return (rt_uint8_t *)stk;
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}
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/*@}*/
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