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

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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
* SPDX-License-Identifier: Apache-2.0
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*
* Change Logs:
* Date Author Notes
* 2011-06-15 aozima the first version for lpc214x
* 2013-03-29 aozima Modify the interrupt interface implementations.
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*/
#include <rtthread.h>
#include <rthw.h>
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#include "lpc214x.h"
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#define MAX_HANDLERS 32
#define SVCMODE 0x13
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extern rt_uint32_t rt_interrupt_nest;
/* exception and interrupt handler table */
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struct rt_irq_desc irq_desc[MAX_HANDLERS];
/**
* @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,
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rt_uint8_t *stack_addr, void *texit)
{
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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 */
/* cpsr */
if ((rt_uint32_t)tentry & 0x01)
*(--stk) = SVCMODE | 0x20; /* thumb mode */
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, void *param)
{
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rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
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}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
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rt_base_t index;
rt_uint32_t *vect_addr, *vect_ctl;
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/* initialize VIC*/
VICIntEnClr = 0xffffffff;
VICVectAddr = 0;
/* set all to IRQ */
VICIntSelect = 0;
rt_memset(irq_desc, 0x00, sizeof(irq_desc));
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for (index = 0; index < MAX_HANDLERS; index ++)
{
irq_desc[index].handler = rt_hw_interrupt_handler;
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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));
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*vect_addr = (rt_uint32_t)&irq_desc[index];
*vect_ctl = 0xF;
}
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/* 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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{
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VICIntEnClr = (1 << vector);
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}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
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{
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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 handler the interrupt service routine to be installed
* @param param the interrupt service function parameter
* @param name the interrupt name
* @return old handler
*/
rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
void *param, const char *name)
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{
rt_isr_handler_t old_handler = RT_NULL;
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if(vector >= 0 && vector < MAX_HANDLERS)
{
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rt_uint32_t* vect_ctl = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + (vector << 2));
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/* assign IRQ slot and enable this slot */
*vect_ctl = 0x20 | (vector & 0x1F);
old_handler = irq_desc[vector].handler;
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if (handler != RT_NULL)
{
irq_desc[vector].handler = handler;
irq_desc[vector].param = param;
}
}
return old_handler;
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}
void rt_hw_trap_irq(void)
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{
int irqno;
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struct rt_irq_desc* irq;
extern struct rt_irq_desc irq_desc[];
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irq = (struct rt_irq_desc*) VICVectAddr;
irqno = ((rt_uint32_t) irq - (rt_uint32_t) &irq_desc[0])/sizeof(struct rt_irq_desc);
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/* invoke isr */
irq->handler(irqno, irq->param);
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/* acknowledge Interrupt */
// VICVectAddr = 0;
}
void rt_hw_trap_fiq(void)
{
rt_kprintf("fast interrupt request\n");
}
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/*@}*/