74 lines
3.0 KiB
C
74 lines
3.0 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
|
||
|
|
* 2011-02-23 Bernard the first version
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <rtthread.h>
|
||
|
|
|
||
|
|
extern volatile rt_uint8_t rt_interrupt_nest;
|
||
|
|
|
||
|
|
/* switch flag on interrupt and thread pointer to save switch record */
|
||
|
|
rt_uint32_t rt_interrupt_from_thread;
|
||
|
|
rt_uint32_t rt_interrupt_to_thread;
|
||
|
|
rt_uint32_t rt_thread_switch_interrput_flag;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This function will initialize hardware interrupt
|
||
|
|
*/
|
||
|
|
void rt_hw_interrupt_init(void)
|
||
|
|
{
|
||
|
|
/* init interrupt nest, and context in thread sp */
|
||
|
|
rt_interrupt_nest = 0;
|
||
|
|
rt_interrupt_from_thread = 0;
|
||
|
|
rt_interrupt_to_thread = 0;
|
||
|
|
rt_thread_switch_interrput_flag = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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_uint16_t *pstk16;
|
||
|
|
rt_uint16_t flag;
|
||
|
|
|
||
|
|
flag = 0x0040;
|
||
|
|
pstk16 = (rt_uint16_t *)stack_addr;
|
||
|
|
pstk16--;
|
||
|
|
|
||
|
|
/* Simulate ISR entry */
|
||
|
|
*pstk16-- = (flag&0x00FF) /* ... The lowest byte of the FLAG register */
|
||
|
|
| (((rt_uint32_t)tentry>>8)&0x00000F00) /* ... The highest nibble of the PC register */
|
||
|
|
| ((flag<<4)&0xF000); /* ... The highest nibble of the FLAG register */
|
||
|
|
*pstk16-- = (((rt_uint32_t)tentry)&0x0000FFFF); /* ... The lowest bytes of the PC register */
|
||
|
|
|
||
|
|
/* Save registers onto stack frame */
|
||
|
|
*pstk16-- = (rt_uint16_t)0xFBFB; /* ... FB register */
|
||
|
|
*pstk16-- = (rt_uint16_t)0x3B3B; /* ... SB register */
|
||
|
|
*pstk16-- = (rt_uint16_t)0xA1A1; /* ... A1 register */
|
||
|
|
*pstk16-- = (rt_uint16_t)0xA0A0; /* ... A0 register */
|
||
|
|
*pstk16-- = (rt_uint16_t)0x3333; /* ... R3 register */
|
||
|
|
*pstk16-- = (rt_uint32_t)parameter >> 16L; /* ... Pass argument in R2 register */
|
||
|
|
*pstk16-- = (rt_uint32_t)parameter & 0x0000FFFFL; /* ... Pass argument in R1 register */
|
||
|
|
*pstk16 = (rt_uint16_t)0x0000; /* ... R0 register */
|
||
|
|
|
||
|
|
/* return task's current stack address */
|
||
|
|
return (rt_uint8_t *)pstk16;
|
||
|
|
}
|