94 lines
3.9 KiB
C
94 lines
3.9 KiB
C
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/*
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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) 2012, 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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* 2012-02-13 mojingxian first version
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*/
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#include <rtthread.h>
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/* flag in interrupt handling */
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rt_uint32_t rt_interrupt_from_thread;
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rt_uint32_t rt_interrupt_to_thread;
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rt_uint32_t rt_thread_switch_interrupt_flag;
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/**
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* initializes stack of thread
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*/
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rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
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rt_uint8_t *stack_addr, void *texit)
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{
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unsigned char i;
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unsigned long *stk;
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stk = (unsigned long *)stack_addr; /* Load stack pointer */
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/* Simulate a function call to the task with an argument */
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stk -= 3; /* 3 words assigned for incoming args (R0, R1, R2) */
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/* Now simulating vectoring to an ISR */
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*--stk = (unsigned long)parameter; /* R0 value - caller's incoming argument #1 */
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*--stk = (unsigned long)0; /* P1 value - value irrelevant */
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*--stk = (unsigned long)texit; /* RETS value - NO task should return with RTS. */
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/* however OS_CPU_Invalid_Task_Return is a safety */
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/* catch-allfor tasks that return with an RTS */
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*--stk = (unsigned long)parameter; /* R1 value - caller's incoming argument #2 */
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/* (not relevant in current test example) */
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*--stk = (unsigned long)parameter; /* R2 value - caller's incoming argument #3 */
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/* (not relevant in current test example) */
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*--stk = (unsigned long)0; /* P0 value - value irrelevant */
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*--stk = (unsigned long)0; /* P2 value - value irrelevant */
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*--stk = (unsigned long)0; /* ASTAT value - caller's ASTAT value - value */
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/* irrelevant */
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*--stk = (unsigned long)tentry; /* RETI value- pushing the start address of the task */
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for (i = 0; i < 35; i++) /* remaining reg values - R7:3, P5:3, */
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{ /* 4 words of A1:0(.W,.X), LT0, LT1, */
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*--stk = (unsigned long)0; /* LC0, LC1, LB0, LB1,I3:0, M3:0, L3:0, B3:0, */
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} /* All values irrelevant */
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return (rt_uint8_t *)stk; /* Return top-of-stack */
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}
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void rt_hw_context_switch(rt_uint32_t from, rt_uint32_t to)
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{
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if (rt_thread_switch_interrupt_flag != 1)
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{
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rt_thread_switch_interrupt_flag = 1;
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rt_interrupt_from_thread = from;
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}
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rt_interrupt_to_thread = to;
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asm("raise 14;"); // Raise Interrupt 14 (trap)
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}
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void rt_hw_context_switch_interrupt(rt_uint32_t from, rt_uint32_t to)
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{
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if (rt_thread_switch_interrupt_flag != 1)
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{
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rt_thread_switch_interrupt_flag = 1;
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rt_interrupt_from_thread = from;
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}
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rt_interrupt_to_thread = to;
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asm("raise 14;"); // Raise Interrupt 14 (trap)
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}
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void rt_hw_context_switch_to(rt_uint32_t to)
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{
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rt_thread_switch_interrupt_flag = 1;
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rt_interrupt_from_thread = 0;
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rt_interrupt_to_thread = to;
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asm("raise 14;"); // Raise Interrupt 14 (trap)
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}
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