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      1 /* $NetBSD: start.S,v 1.2 2003/02/07 17:52:08 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.  The "Broadcom Corporation" name may not be
     19  *    used to endorse or promote products derived from this software
     20  *    without the prior written permission of Broadcom Corporation.
     21  *
     22  * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
     23  *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
     24  *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
     25  *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
     26  *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
     27  *    LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     30  *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     31  *    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     32  *    OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #define STACK_SIZE 8192
     36 
     37 #include "include/asm.h"
     38 
     39 
     40 	  .bss
     41 
     42 	  .comm stack_bottom,STACK_SIZE
     43 
     44 	.text
     45 
     46 LEAF(start)
     47 
     48 	la	gp,_gp
     49 
     50 	la	sp,stack_bottom+STACK_SIZE-32
     51 
     52 /*
     53  * On entry: a0 = the firmware handle, a2 = firmware's
     54  * for secondary bootstraps, a1 is the booted device handle
     55  * Don't trash a0..a3 until main is called!
     56  */
     57 
     58 
     59 #if defined(STANDALONE_PROGRAM)
     60 	/*
     61 	 * This should not be used anywhere.
     62 	 */
     63 
     64 #error "don't do this."
     65 
     66 #else /* defined(STANDALONE_PROGRAM) */
     67 
     68 #if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
     69 
     70         la      sp,start
     71 
     72 #endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
     73 
     74 #endif /* defined(STANDALONE_PROGRAM) */
     75 
     76 /*
     77  * Zero BSS
     78  */
     79 
     80 	la	t0,_edata		/* t0 = address */
     81 	la	t1,_end
     82 
     83 1:	sw	zero,0(t0)
     84 	sw	zero,4(t0)
     85 	sw	zero,8(t0)
     86 	sw	zero,16(t0)
     87 	add	t0,16
     88 	ble	t0,t1,1b
     89 
     90 
     91 /*
     92  * Run the main program.
     93  */
     94 
     95 	jal     main			/* transfer to C */
     96 
     97 XLEAF(halt)
     98 	li	t0,0xBFC00000		/* transfer back to firmware */
     99 	j	t0
    100 END(start)
    101 
    102 
    103 
    104 LEAF(__main)
    105 	j	ra
    106 END(__main)
    107 
    108 LEAF(_rtt)
    109 	li	t0,0xBFC00000
    110 	j	t0
    111 END(_rtt)
    112