rt-thread-official/libcpu/arm/lpc214x/cpuport.c

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/*
* 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
* 2011-06-15 aozima the first version for lpc214x
*/
#include <rtthread.h>
#include "lpc214x.h"
#define MAX_HANDLERS 32
#define SVCMODE 0x13
extern rt_uint32_t rt_interrupt_nest;
/**
* @addtogroup LPC214x
*/
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/*@{*/
/**
* 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)
{
unsigned long *stk;
stk = (unsigned long *)stack_addr;
*(stk) = (unsigned long)tentry; /* entry point */
*(--stk) = (unsigned long)texit; /* lr */
*(--stk) = 0; /* r12 */
*(--stk) = 0; /* r11 */
*(--stk) = 0; /* r10 */
*(--stk) = 0; /* r9 */
*(--stk) = 0; /* r8 */
*(--stk) = 0; /* r7 */
*(--stk) = 0; /* r6 */
*(--stk) = 0; /* r5 */
*(--stk) = 0; /* r4 */
*(--stk) = 0; /* r3 */
*(--stk) = 0; /* r2 */
*(--stk) = 0; /* r1 */
*(--stk) = (unsigned long)parameter; /* r0 : argument */
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/* cpsr */
if ((rt_uint32_t)tentry & 0x01)
*(--stk) = SVCMODE | 0x20; /* thumb mode */
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else
*(--stk) = SVCMODE; /* arm mode */
/* return task's current stack address */
return (rt_uint8_t *)stk;
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}
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/* exception and interrupt handler table */
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
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void rt_hw_interrupt_handler(int vector)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
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}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init()
{
rt_base_t index;
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rt_uint32_t *vect_addr, *vect_ctl;
/* initialize VIC*/
VICIntEnClr = 0xffffffff;
VICVectAddr = 0;
/* set all to IRQ */
VICIntSelect = 0;
for (index = 0; index < MAX_HANDLERS; index ++)
{
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vect_addr = (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + (index << 2));
vect_ctl = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + (index << 2));
*vect_addr = (rt_uint32_t)rt_hw_interrupt_handler;
*vect_ctl = 0xF;
}
/* 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_interrupt_flag = 0;
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}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(int vector)
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{
VICIntEnClr = (1 << vector);
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
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{
VICIntEnable = (1 << vector);
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}
/**
* This function will install a interrupt service routine to a interrupt.
* @param vector the interrupt number
* @param new_handler the interrupt service routine to be installed
* @param old_handler the old interrupt service routine
*/
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
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{
if(vector >= 0 && vector < MAX_HANDLERS)
{
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/* get VIC address */
rt_uint32_t* vect_addr = (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + (vector << 2));
rt_uint32_t* vect_ctl = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + (vector << 2));
/* assign IRQ slot and enable this slot */
*vect_ctl = 0x20 | (vector & 0x1F);
if (old_handler != RT_NULL) *old_handler = (rt_isr_handler_t) *vect_addr;
if (new_handler != RT_NULL) *vect_addr = (rt_uint32_t) new_handler;
}
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}
/**
* this function will reset CPU
*
*/
void rt_hw_cpu_reset()
{
}
/**
* this function will shutdown CPU
*
*/
void rt_hw_cpu_shutdown()
{
rt_kprintf("shutdown...\n");
while (1);
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}
void rt_hw_trap_irq()
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{
rt_isr_handler_t isr_func;
isr_func = (rt_isr_handler_t) VICVectAddr;
isr_func(0);
/* acknowledge Interrupt */
// VICVectAddr = 0;
}
void rt_hw_trap_fiq()
{
rt_kprintf("fast interrupt request\n");
}
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/*@}*/