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start.S revision 1.1 
      1 /* $NetBSD: start.S,v 1.1 2002/11/09 06:20:41 cgd Exp $ */
      2 
      3 /*
      4  * Copyright 2000, 2001
      5  * Broadcom Corporation. All rights reserved.
      6  *
      7  * This software is furnished under license and may be used and copied only
      8  * in accordance with the following terms and conditions.  Subject to these
      9  * conditions, you may download, copy, install, use, modify and distribute
     10  * modified or unmodified copies of this software in source and/or binary
     11  * form. No title or ownership is transferred hereby.
     12  *
     13  * 1) Any source code used, modified or distributed must reproduce and
     14  *    retain this copyright notice and list of conditions as they appear in
     15  *    the source file.
     16  *
     17  * 2) No right is granted to use any trade name, trademark, or logo of
     18  *    Broadcom Corporation. Neither the "Broadcom Corporation" name nor any
     19  *    trademark or logo of Broadcom Corporation may be used to endorse or
     20  *    promote products derived from this software without the prior written
     21  *    permission of Broadcom Corporation.
     22  *
     23  * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
     24  *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
     25  *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
     26  *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
     27  *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
     28  *    LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     29  *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     30  *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     31  *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     32  *    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     33  *    OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 #define STACK_SIZE 8192
     37 
     38 #include "include/asm.h"
     39 
     40 
     41 	  .bss
     42 
     43 	  .comm stack_bottom,STACK_SIZE
     44 
     45 	.text
     46 
     47 LEAF(start)
     48 
     49 	la	gp,_gp
     50 
     51 	la	sp,stack_bottom+STACK_SIZE-32
     52 
     53 /*
     54  * On entry: a0 = the firmware handle, a2 = firmware's
     55  * for secondary bootstraps, a1 is the booted device handle
     56  * Don't trash a0..a3 until main is called!
     57  */
     58 
     59 
     60 #if defined(STANDALONE_PROGRAM)
     61 	/*
     62 	 * This should not be used anywhere.
     63 	 */
     64 
     65 #error "don't do this."
     66 
     67 #else /* defined(STANDALONE_PROGRAM) */
     68 
     69 #if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
     70 
     71         la      sp,start
     72 
     73 #endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
     74 
     75 #endif /* defined(STANDALONE_PROGRAM) */
     76 
     77 /*
     78  * Zero BSS
     79  */
     80 
     81 	la	t0,_edata		/* t0 = address */
     82 	la	t1,_end
     83 
     84 1:	sw	zero,0(t0)
     85 	sw	zero,4(t0)
     86 	sw	zero,8(t0)
     87 	sw	zero,16(t0)
     88 	add	t0,16
     89 	ble	t0,t1,1b
     90 
     91 
     92 /*
     93  * Run the main program.
     94  */
     95 
     96 	jal     main			/* transfer to C */
     97 
     98 XLEAF(halt)
     99 	li	t0,0xBFC00000		/* transfer back to firmware */
    100 	j	t0
    101 END(start)
    102 
    103 
    104 
    105 LEAF(__main)
    106 	j	ra
    107 END(__main)
    108 
    109 LEAF(_rtt)
    110 	li	t0,0xBFC00000
    111 	j	t0
    112 END(_rtt)
    113