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 47LEAF(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 83 841: 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 98XLEAF(halt) 99 li t0,0xBFC00000 /* transfer back to firmware */ 100 j t0 101END(start) 102 103 104 105LEAF(__main) 106 j ra 107END(__main) 108 109LEAF(_rtt) 110 li t0,0xBFC00000 111 j t0 112END(_rtt) 113