csl_intchookisr.c

TI达芬奇dm644x各硬件模块测试代码

/*  ============================================================================
 *   Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005                 
 *                                                                              
 *   Use of this software is controlled by the terms and conditions found in the
 *   license agreement under which this software has been supplied.             
 *   ===========================================================================
 */
/**
 *  @file  csl_intcHookIsr.c
 *
 *  @brief  File for functional layer of CSL API @a CSL_intcHookIsr()
 *
 *  Description
 *  - CSL_intcHookIsr(..) function definition
 *  
 *  PATH  \\(CSLPATH)\\soc\\davinci\\c64plus\\src\\intc
 *
 *  @date 12th June, 2004
 *  @author Ruchika Kharwar
 *
 */

/* =============================================================================
 *  Revision History
 *  ===============
 *  16-Mar-2005 brn modified for doxygen documentation
 * =============================================================================
 */
 
#include <csl_intc.h>
#include <_csl_intc.h>

/** ============================================================================
 *  @n@b CSL_intcHookIsr
 *
 *  @b Description
 *  @n Hook up an exception handler
 *     This API hooks up the handler to the specified exception.
 *     Note: In this case, it is done by inserting a B(ranch) instruction
 *     to the handler. Because of the restriction in the instruction
 *     th handler must be within 32MB of the exception vector.
 *     Also, the function assumes that the exception vector table is
 *     located at its default ("low") address.
 *
 *  @b Arguments
 *  @verbatim
        vectId       Interrupt Vector identifier
        
        isrAddr      Pointer to the handler
    @endverbatim
 *
 *  @b Example:
 *  @verbatim
        CSL_IntcContext context; 
        CSL_Status intStat;
        CSL_IntcParam vectId;
        CSL_IntcObj intcObj20;
        CSL_IntcHandle hIntc20;
        CSL_IntcDropStatus drop;
        CSL_IntcEventHandlerRecord recordTable[10];
        CSL_IntcGlobalEnableState state;
        Uint32 intrStat;
        
        context.numEvtEntries = 10;
        context.eventhandlerRecord = &recordTable;
        
        // Init Module
        ...
        if (CSL_intcInit(&context) != CSL_SOK)
           exit;
        // Opening a handle for the Event 20 at vector id 4
        
        vectId = CSL_INTC_VECTID_4;
        hIntc20 = CSL_intcOpen (&intcObj20, CSL_INTC_EVENTID_20, &vectId , NULL);
        
        CSL_intcNmiEnable();
        // Enable Global Interrupts 
        intStat = CSL_intcGlobalEnable(&state);
        
        // Hook Isr appropriately
    CSL_intcHookIsr(CSL_INTC_VECTID_4, &isrVect4);
        ...
         }
    interrupt void isrVect4()
    {
        
    }
 *  @endverbatim
 *  ============================================================================
 */
#pragma CODE_SECTION (CSL_intcHookIsr, ".text:csl_section:intc");
CSL_Status  CSL_intcHookIsr(
    CSL_IntcVectId        evtId,
    void                  *isrAddr
)
{
    Uint32 *dispPtr ;
    dispPtr = (Uint32*)(&_CSL_intcCpuIntrTable);
    dispPtr[evtId + 1] = (Uint32)(isrAddr);
    return(CSL_SOK);
}