start.S revision 1.1
1 1.1 cgd /* $NetBSD: start.S,v 1.1 2002/11/09 06:20:41 cgd Exp $ */ 2 1.1 cgd 3 1.1 cgd /* 4 1.1 cgd * Copyright 2000, 2001 5 1.1 cgd * Broadcom Corporation. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This software is furnished under license and may be used and copied only 8 1.1 cgd * in accordance with the following terms and conditions. Subject to these 9 1.1 cgd * conditions, you may download, copy, install, use, modify and distribute 10 1.1 cgd * modified or unmodified copies of this software in source and/or binary 11 1.1 cgd * form. No title or ownership is transferred hereby. 12 1.1 cgd * 13 1.1 cgd * 1) Any source code used, modified or distributed must reproduce and 14 1.1 cgd * retain this copyright notice and list of conditions as they appear in 15 1.1 cgd * the source file. 16 1.1 cgd * 17 1.1 cgd * 2) No right is granted to use any trade name, trademark, or logo of 18 1.1 cgd * Broadcom Corporation. Neither the "Broadcom Corporation" name nor any 19 1.1 cgd * trademark or logo of Broadcom Corporation may be used to endorse or 20 1.1 cgd * promote products derived from this software without the prior written 21 1.1 cgd * permission of Broadcom Corporation. 22 1.1 cgd * 23 1.1 cgd * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED 24 1.1 cgd * WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF 25 1.1 cgd * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 26 1.1 cgd * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE 27 1.1 cgd * FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE 28 1.1 cgd * LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 1.1 cgd * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 1.1 cgd * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 31 1.1 cgd * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 1.1 cgd * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 33 1.1 cgd * OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 1.1 cgd */ 35 1.1 cgd 36 1.1 cgd #define STACK_SIZE 8192 37 1.1 cgd 38 1.1 cgd #include "include/asm.h" 39 1.1 cgd 40 1.1 cgd 41 1.1 cgd .bss 42 1.1 cgd 43 1.1 cgd .comm stack_bottom,STACK_SIZE 44 1.1 cgd 45 1.1 cgd .text 46 1.1 cgd 47 1.1 cgd LEAF(start) 48 1.1 cgd 49 1.1 cgd la gp,_gp 50 1.1 cgd 51 1.1 cgd la sp,stack_bottom+STACK_SIZE-32 52 1.1 cgd 53 1.1 cgd /* 54 1.1 cgd * On entry: a0 = the firmware handle, a2 = firmware's 55 1.1 cgd * for secondary bootstraps, a1 is the booted device handle 56 1.1 cgd * Don't trash a0..a3 until main is called! 57 1.1 cgd */ 58 1.1 cgd 59 1.1 cgd 60 1.1 cgd #if defined(STANDALONE_PROGRAM) 61 1.1 cgd /* 62 1.1 cgd * This should not be used anywhere. 63 1.1 cgd */ 64 1.1 cgd 65 1.1 cgd #error "don't do this." 66 1.1 cgd 67 1.1 cgd #else /* defined(STANDALONE_PROGRAM) */ 68 1.1 cgd 69 1.1 cgd #if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) 70 1.1 cgd 71 1.1 cgd la sp,start 72 1.1 cgd 73 1.1 cgd #endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */ 74 1.1 cgd 75 1.1 cgd #endif /* defined(STANDALONE_PROGRAM) */ 76 1.1 cgd 77 1.1 cgd /* 78 1.1 cgd * Zero BSS 79 1.1 cgd */ 80 1.1 cgd 81 1.1 cgd la t0,_edata /* t0 = address */ 82 1.1 cgd la t1,_end 83 1.1 cgd 84 1.1 cgd 1: sw zero,0(t0) 85 1.1 cgd sw zero,4(t0) 86 1.1 cgd sw zero,8(t0) 87 1.1 cgd sw zero,16(t0) 88 1.1 cgd add t0,16 89 1.1 cgd ble t0,t1,1b 90 1.1 cgd 91 1.1 cgd 92 1.1 cgd /* 93 1.1 cgd * Run the main program. 94 1.1 cgd */ 95 1.1 cgd 96 1.1 cgd jal main /* transfer to C */ 97 1.1 cgd 98 1.1 cgd XLEAF(halt) 99 1.1 cgd li t0,0xBFC00000 /* transfer back to firmware */ 100 1.1 cgd j t0 101 1.1 cgd END(start) 102 1.1 cgd 103 1.1 cgd 104 1.1 cgd 105 1.1 cgd LEAF(__main) 106 1.1 cgd j ra 107 1.1 cgd END(__main) 108 1.1 cgd 109 1.1 cgd LEAF(_rtt) 110 1.1 cgd li t0,0xBFC00000 111 1.1 cgd j t0 112 1.1 cgd END(_rtt) 113
Indexes created Fri Sep 26 08:10:20 GMT 2025