l1start.trees

TM1300/PNX1300系列DSP（主要用于视频处理）的自动boot程序

(*
 *  +-------------------------------------------------------------------+
 *  | Copyright (c) 1995,2000 TriMedia Technologies Inc.                |
 *  |                                                                   |
 *  | This software  is furnished under a license  and may only be used |
 *  | and copied in accordance with the terms  and conditions of such a |
 *  | license  and with  the inclusion of this  copyright notice.  This |
 *  | software or any other copies of this software may not be provided |
 *  | or otherwise  made available  to any other person.  The ownership |
 *  | and title of this software is not transferred.                    |
 *  |                                                                   |
 *  | The information  in this software  is subject  to change  without |
 *  | any  prior notice  and should not be construed as a commitment by |
 *  | TriMedia Technologies.                                            |
 *  |                                                                   |
 *  | This  code  and  information  is  provided  "as is"  without  any |
 *  | warranty of any kind,  either expressed or implied, including but |
 *  | not limited  to the implied warranties  of merchantability and/or |
 *  | fitness for any particular purpose.                               |
 *  +-------------------------------------------------------------------+
 *)

(*
 *  Module name              : l1start.trees
 *
 *  Module type              : 
 *
 *  Title                    : L1 startup code
 *
 *  Last update              : Tue Jul 15 09:53:10 PDT 1997
 *
 *)

(*--------------------------------------------------------------------------*)
(*  Copy this file to l1start.t and then compile as tmcc -x l1start.t *)

#define __TMAS__
#include <tm1/mmio.h>

(*--------------------------------------------------------------------------*)

#ifdef __BIG_ENDIAN__ 
#define INITIAL_PCSW_VALUE     0x0800   (* CS                             *)
#define INITIAL_BIU_CTL_VALUE  0x0200   (* Host Enable                    *)
#else   
#define INITIAL_PCSW_VALUE     0x0A00   (* CS + Byte Sex                  *)
#define INITIAL_BIU_CTL_VALUE  0x0201   (* Host Enable + Byte Swap Enable *)
#endif  
 
(*--------------------------------------------------------------------------*)


	.text
	.global __start
        .global _L1main                 (* defined in l1jtag.c *)

__start:
__start_DT_0:
entree(0)
.treeinfo regmask "0x00000000000000000fffffffffffffff";

        (* iclr just to be sure *)

	10 iclr;          

        20 uimm (INITIAL_PCSW_VALUE);
        21 uimm (-1); 
        22 writepcsw 20 21;

	(* set up stack: FP and SP *)
	
	30 uimm (__begin_stack_init);
        33 wrreg (3) 30;
        34 wrreg (4) 30;

	(* set up return pointer *)

        40 uimm(__start_DT_1);
        41 wrreg (2)  40;

	(* configure BIU CTL *)
        
        50 uimm (BIU_CTL);
	51 uimm (__MMIO_base_init);
        52 iadd 50 51;
        53 uimm (INITIAL_BIU_CTL_VALUE);
        54 st32 52 53;

	gotree {_L1main}

endtree



(* Control returns to __start_DT_1 when L1main() is done with loading
 * L2 code into SDRAM.  Enter into infinite idle loop.
 *)

__start_DT_1:
entree(0)
.treeinfo regmask "0x00000000000000000fffffffffffffff";

	gotree {__start_DT_1}	(* infinite loop *)
endtree