start.S revision 1.1
1 1.1 mrg /* $NetBSD: start.S,v 1.1 2017/07/24 08:56:29 mrg Exp $ */ 2 1.1 mrg 3 1.1 mrg /* 4 1.1 mrg * Copyright 2000, 2001 5 1.1 mrg * Broadcom Corporation. All rights reserved. 6 1.1 mrg * 7 1.1 mrg * This software is furnished under license and may be used and copied only 8 1.1 mrg * in accordance with the following terms and conditions. Subject to these 9 1.1 mrg * conditions, you may download, copy, install, use, modify and distribute 10 1.1 mrg * modified or unmodified copies of this software in source and/or binary 11 1.1 mrg * form. No title or ownership is transferred hereby. 12 1.1 mrg * 13 1.1 mrg * 1) Any source code used, modified or distributed must reproduce and 14 1.1 mrg * retain this copyright notice and list of conditions as they appear in 15 1.1 mrg * the source file. 16 1.1 mrg * 17 1.1 mrg * 2) No right is granted to use any trade name, trademark, or logo of 18 1.1 mrg * Broadcom Corporation. The "Broadcom Corporation" name may not be 19 1.1 mrg * used to endorse or promote products derived from this software 20 1.1 mrg * without the prior written permission of Broadcom Corporation. 21 1.1 mrg * 22 1.1 mrg * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED 23 1.1 mrg * WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF 24 1.1 mrg * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 25 1.1 mrg * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE 26 1.1 mrg * FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE 27 1.1 mrg * LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 1.1 mrg * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 1.1 mrg * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 1.1 mrg * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 1.1 mrg * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 32 1.1 mrg * OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 1.1 mrg */ 34 1.1 mrg 35 1.1 mrg #define STACK_SIZE 8192 36 1.1 mrg 37 1.1 mrg #include "include/asm.h" 38 1.1 mrg 39 1.1 mrg 40 1.1 mrg .bss 41 1.1 mrg 42 1.1 mrg .comm stack_bottom,STACK_SIZE 43 1.1 mrg 44 1.1 mrg .text 45 1.1 mrg 46 1.1 mrg LEAF(start) 47 1.1 mrg 48 1.1 mrg la gp,_gp 49 1.1 mrg 50 1.1 mrg la sp,stack_bottom+STACK_SIZE-32 51 1.1 mrg 52 1.1 mrg /* 53 1.1 mrg * On entry: a0 = the firmware handle, a2 = firmware's 54 1.1 mrg * for secondary bootstraps, a1 is the booted device handle 55 1.1 mrg * Don't trash a0..a3 until main is called! 56 1.1 mrg */ 57 1.1 mrg 58 1.1 mrg 59 1.1 mrg #if defined(STANDALONE_PROGRAM) 60 1.1 mrg /* 61 1.1 mrg * This should not be used anywhere. 62 1.1 mrg */ 63 1.1 mrg 64 1.1 mrg #error "don't do this." 65 1.1 mrg 66 1.1 mrg #else /* defined(STANDALONE_PROGRAM) */ 67 1.1 mrg 68 1.1 mrg #if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) 69 1.1 mrg 70 1.1 mrg la sp,start 71 1.1 mrg 72 1.1 mrg #endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */ 73 1.1 mrg 74 1.1 mrg #endif /* defined(STANDALONE_PROGRAM) */ 75 1.1 mrg 76 1.1 mrg /* 77 1.1 mrg * Zero BSS 78 1.1 mrg */ 79 1.1 mrg 80 1.1 mrg la t0,_edata /* t0 = address */ 81 1.1 mrg la t1,_end 82 1.1 mrg 83 1.1 mrg 1: sw zero,0(t0) 84 1.1 mrg sw zero,4(t0) 85 1.1 mrg sw zero,8(t0) 86 1.1 mrg sw zero,16(t0) 87 1.1 mrg add t0,16 88 1.1 mrg ble t0,t1,1b 89 1.1 mrg 90 1.1 mrg 91 1.1 mrg /* 92 1.1 mrg * Run the main program. 93 1.1 mrg */ 94 1.1 mrg 95 1.1 mrg jal main /* transfer to C */ 96 1.1 mrg 97 1.1 mrg XLEAF(halt) 98 1.1 mrg li t0,0xBFC00000 /* transfer back to firmware */ 99 1.1 mrg j t0 100 1.1 mrg END(start) 101 1.1 mrg 102 1.1 mrg 103 1.1 mrg 104 1.1 mrg LEAF(__main) 105 1.1 mrg j ra 106 1.1 mrg END(__main) 107 1.1 mrg 108 1.1 mrg LEAF(_rtt) 109 1.1 mrg li t0,0xBFC00000 110 1.1 mrg j t0 111 1.1 mrg END(_rtt) 112
Indexes created Mon Oct 20 05:10:11 GMT 2025