rt-thread/libcpu/xilinx/microblaze/trap.c

/*
 * File      : trap.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, 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://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-08-23     Bernard      first version
 * 2011-12-17	  nl1031	   for MicroBlaze
 *
 */

#include 	<rtthread.h>
#include 	"xparameters.h"
#include 	"xintc.h"
#include    "xintc_i.h"
#include    "xintc_l.h"


#define MAX_HANDLERS  XPAR_INTC_MAX_NUM_INTR_INPUTS
extern XIntc int_ctl; /* The instance of the Interrupt Controller */


extern rt_uint32_t rt_interrupt_nest;

rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;


void rt_hw_interrupt_handler(int vector)
{
	rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}

/**
 * This function will initialize hardware interrupt
 */
void rt_hw_interrupt_init()
{
	rt_base_t index;

	XIntc_Config           *CfgPtr;


    CfgPtr = &XIntc_ConfigTable[0];


	for (index = 0; index < MAX_HANDLERS; index ++)
	{
		CfgPtr->HandlerTable[index].Handler = (XInterruptHandler)rt_hw_interrupt_handler;
	}

	/* 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;
}

/**
 * This function will mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_mask(int vector)
{
	/* disable interrupt */
	XIntc_Disable(&int_ctl,vector);
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
	XIntc_Enable(&int_ctl,vector);
}

/**
 * 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)
{
	XIntc_Config           *CfgPtr;

    CfgPtr = &XIntc_ConfigTable[0];

	if(vector >= 0 && vector < MAX_HANDLERS)
	{
		if (*old_handler != RT_NULL) *old_handler = (rt_isr_handler_t)CfgPtr->HandlerTable[vector].Handler;
		if (new_handler != RT_NULL) CfgPtr->HandlerTable[vector].Handler = (XInterruptHandler)new_handler;
	}
}

/*****************************************************************************/
/** copy from XIntc_DeviceInterruptHandler in xintc_l.c nl1031
*
* This function is the primary interrupt handler for the driver. It must be
* connected to the interrupt source such that is called when an interrupt of
* the interrupt controller is active. It will resolve which interrupts are
* active and enabled and call the appropriate interrupt handler. It uses
* the AckBeforeService flag in the configuration data to determine when to
* acknowledge the interrupt. Highest priority interrupts are serviced first.
* The driver can be configured to service only the highest priority interrupt
* or all pending interrupts using the {XIntc_SetOptions()} function or
* the {XIntc_SetIntrSrvOption()} function.
*
* This function assumes that an interrupt vector table has been previously
* initialized.  It does not verify that entries in the table are valid before
* calling an interrupt handler.
*
*
* @return	None.
*
* @note
*
* The constant XPAR_INTC_MAX_NUM_INTR_INPUTS must be setup for this to compile.
* Interrupt IDs range from 0 - 31 and correspond to the interrupt input signals
* for the interrupt controller. XPAR_INTC_MAX_NUM_INTR_INPUTS specifies the
* highest numbered interrupt input signal that is used.
*
******************************************************************************/


void rt_hw_trap_irq(void )
{
	u32 intr_status;
	u32 intr_mask = 1;
	int intr_number;
	volatile u32 reg;			/* used as bit bucket */
	XIntc_Config *cfg_ptr;


	/* Get the configuration data using the device ID */
	cfg_ptr = &XIntc_ConfigTable[0];

	/* Get the interrupts that are waiting to be serviced */
	intr_status = XIntc_GetIntrStatus(XPAR_INTC_0_BASEADDR);

	/* Service each interrupt that is active and enabled by checking each
	 * bit in the register from LSB to MSB which corresponds to an interrupt
	 * intput signal
	 */
	for (intr_number = 0; intr_number < XPAR_INTC_MAX_NUM_INTR_INPUTS; intr_number++)
	{
		if (intr_status & 1)
		{
			XIntc_VectorTableEntry *table_ptr;

			/* If the interrupt has been setup to acknowledge it
			 * before servicing the interrupt, then ack it
			 */
			if (cfg_ptr->AckBeforeService & intr_mask)
			{
				XIntc_AckIntr(cfg_ptr->BaseAddress, intr_mask);
			}

			/* The interrupt is active and enabled, call the
			 * interrupt handler that was setup with the specified
			 * parameter
			 */
			table_ptr = &(cfg_ptr->HandlerTable[intr_number]);
			table_ptr->Handler(table_ptr->CallBackRef);

			/* If the interrupt has been setup to acknowledge it
			 * after it has been serviced then ack it
			 */
			if ((cfg_ptr->AckBeforeService & intr_mask) == 0)
			{
				XIntc_AckIntr(cfg_ptr->BaseAddress, intr_mask);
			}

			/*
			 * Read the ISR again to handle architectures with posted write
			 * bus access issues.
			 */
			reg = XIntc_GetIntrStatus(cfg_ptr->BaseAddress);

			/*
			 * If only the highest priority interrupt is to be
			 * serviced, exit loop and return after servicing
			 * the interrupt
			 */
			if (cfg_ptr->Options == XIN_SVC_SGL_ISR_OPTION)
			{
				return;
			}
		}

		/* Move to the next interrupt to check */
		intr_mask <<= 1;
		intr_status >>= 1;

		/* If there are no other bits set indicating that all interrupts
		 * have been serviced, then exit the loop
		 */
		if (intr_status == 0)
		{
			break;
		}
	}
}