**H***************************************************************************
*
* $Archive::                                                                 $
* $Revision::                                                                $
* $Date::                                                                    $
* $Author::                                                                  $
*
* DESCRIPTION:
*   THIS IS THE MOST IMPORTANT FILE WHEN USING INTERRUPTS.  This file maps
*	the interrupts to a varable.  This allows for easy debugging because you
*	can set breakpoints at the interrupts definitions to determine which one 
*	is being tripped.
* GLOBALS
*
* PUBLIC FUNCTIONS:
*                              
* PRIVATE FUNCTIONS:
*
* USAGE/LIMITATIONS:
*
* NOTES:
*   
* By: Patrick Cresap  
*
*H****************************************************************************

**---- compilation control switches ----------------------------------------**

******************************************************************************
* INCLUDE FILES
******************************************************************************
**---- system and platform files -------------------------------------------**

**---- program files -------------------------------------------------------**

******************************************************************************
* EXTERNAL REFERENCE    
******************************************************************************
**---- data declarations ---------------------------------------------------**

**---- function prototypes -------------------------------------------------**

******************************************************************************
* PUBLIC DECLARATIONS 
******************************************************************************

**---- data declarations ---------------------------------------------------**

******************************************************************************
* PRIVATE DECLARATIONS  
******************************************************************************
**---- context -------------------------------------------------------------**

**---- data declarations ---------------------------------------------------**

**---- function prototypes -------------------------------------------------**

**---- macros --------------------------------------------------------------**


 	  .length 58  
	  .mmregs
	  
	  ;all interrupts used in the program must be referenced
      .ref  _c_int00 
      .ref  _c_int19 ;timer interrupt reference (name matches the one in main program)
      .ref  _c_int20 ;serial port interrupt reference
      .global  _xboot
      
      
*****************************************************************************
*   INTERRUPT VECTORS	                          *
*	Make sure that every interrupt is defined in the .sect "myvectors"
*	section.  These are all the standard interrupts for the C54X.  Also, you
*	need to referrence the ones that you use in your code in the .ref part.
*   
*	NOTE: There are 4 words per instructions per interrupt.
*	The B (branch) statements takes 2, while NOP are 1 each
*	Maps a name (on the left) to a interrupt (on the right).	
*****************************************************************************

	  .sect "myvectors"

VECT_PMST:
_reset:  B   _xboot    
        NOP              
        NOP
_nmi:	  B	_nmi     
        NOP
        NOP
_sint17:	  B	_sint17  
        NOP
        NOP
_sint18:	  B	_sint18    
        NOP
        NOP
_sint19:	  B	_sint19   
        NOP
        NOP
_sint20:	  B	_sint20  
        NOP
        NOP
_sint21: 	  B _sint21   
        NOP
        NOP
_sint22:	  B	_sint22   
        NOP
        NOP
_sint23:	  B	_sint23   
        NOP
        NOP
_sint24:	  B	_sint24   
        NOP
        NOP
_sint25:	  B	_sint25   
        NOP
        NOP
_sint26:	  B	_sint26   
        NOP
        NOP
_sint27:      B   _sint27  
        NOP  
        NOP  
_sint28       B   _sint28 
        NOP
        NOP
_sint29	  B	_sint29   
        NOP
        NOP
_sint30	  B	_sint30   
        NOP
        NOP
_int0	  B	_int0 
        NOP
        NOP
_int1	  B	_int1   
        NOP
        NOP
_int2	  B	_int2   
        NOP
        NOP  
;the commented section is for extended memory
;        .if  EXTENDED_MEMORY=1    
;_tint	PSHM XPC
;		nop
;		FB	_c_int19   ; timer interrupt
;_rint0	PSHM XPC
;		nop
;		FB	_c_int20  ; serial port receive interrupt   
;		.else		
_tint	B   _c_int19
		NOP
		NOP   ; timer interrupt
_rint0	B   _c_int20
		NOP
		NOP  ; serial port receive interrupt   
;		.endif
_xint0	  B	_xint0   
        NOP
        NOP
_rint2	  B	_rint2   
        NOP
        NOP
_xint2	  B	_xint2   
        NOP
        NOP
_int3	  B	_int3   
        NOP
        NOP
_hint	  B	_hint  
        NOP
        NOP
_brint1	  B	_brint1  
        NOP
        NOP
_bxint1	  B	_bxint1  
        NOP
        NOP        

              .text
; this sets the PMST up, and makes sures that interrupts are disabled before
; resetting the chip             
_xboot:    	                        ; b       $ for debug
              ld      #0,dp
              stm     #0,sp
              rsbx    sxm           ; Disable sign extension
              ssbx    intm          ; Disable interrupts 
              stm     #0,imr
              stm     #0ffffh,ifr   ; Clear ifr
              ld      #VECT_PMST,a  ; Set PMST for vectors  
              or      #0060h,a
              stlm    a,pmst        ;
              rpt     #4
              nop  
              b       _c_int00          
                            

              .end