94 lines
3.5 KiB
C
94 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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* 2011-02-23 Bernard the first version
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*/
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#include <rtthread.h>
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extern volatile rt_uint8_t rt_interrupt_nest;
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/* switch flag on interrupt and thread pointer to save switch record */
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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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* This function will initialize hardware interrupt
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*/
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void rt_hw_interrupt_init(void)
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{
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/* init interrupt nest, and context in thread sp */
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rt_interrupt_nest = 0;
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rt_interrupt_from_thread = 0;
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rt_interrupt_to_thread = 0;
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rt_thread_switch_interrupt_flag = 0;
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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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stk = (rt_uint32_t *)stack_addr; /* Load stack pointer */
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*(--stk) = (rt_uint32_t) 0x23232323; /* r23 */
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*(--stk) = (rt_uint32_t) 0x24242424; /* r24 */
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*(--stk) = (rt_uint32_t) 0x25252525; /* r25 */
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*(--stk) = (rt_uint32_t) 0x26262626; /* r26 */
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*(--stk) = (rt_uint32_t) 0x27272727; /* r27 */
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*(--stk) = (rt_uint32_t) 0x28282828; /* r28 */
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*(--stk) = (rt_uint32_t) 0x29292929; /* r29 */
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*(--stk) = (rt_uint32_t) 0x30303030; /* r30 */
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*(--stk) = (rt_uint32_t) 0x31313131; /* r31 */
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*(--stk) = (rt_uint32_t) 0x00000000; /* Task PSW = Interrupts enabled */
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*(--stk) = (rt_uint32_t) tentry; /* Task's PC */
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*(--stk) = (rt_uint32_t) 0x16161616; /* r16 */
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*(--stk) = (rt_uint32_t) 0x15151515; /* r15 */
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*(--stk) = (rt_uint32_t) 0x14141414; /* r14 */
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*(--stk) = (rt_uint32_t) 0x13131313; /* r13 */
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*(--stk) = (rt_uint32_t) 0x12121212; /* r12 */
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*(--stk) = (rt_uint32_t) 0x11111111; /* r11 */
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*(--stk) = (rt_uint32_t) 0x10101010; /* r10 */
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*(--stk) = (rt_uint32_t) 0x09090909; /* r9 */
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*(--stk) = (rt_uint32_t) 0x08080808; /* r8 */
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*(--stk) = (rt_uint32_t) 0x07070707; /* r7 */
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*(--stk) = (rt_uint32_t) 0x06060606; /* r6 */
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*(--stk) = (rt_uint32_t) 0x05050505; /* r5 */
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*(--stk) = (rt_uint32_t) 0x02020202; /* r2 */
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*(--stk) = (rt_uint32_t) parameter; /* r1 */
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return ((rt_uint8_t *)stk);
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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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rt_interrupt_from_thread = from;
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rt_interrupt_to_thread = to;
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asm("trap 0x10");
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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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} |