1/* $NetBSD: start.S,v 1.7 2008/04/28 20:23:16 martin Exp $ */ 2 3/* 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Wayne Knowles 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <mips/asm.h> 33#include <mips/cache_r4k.h> 34 35LEAF(start) 36 .set noreorder 37 .set mips3 38#ifdef __GP_SUPPORT__ 39 la gp, _C_LABEL (_gp) 40#endif 41 la sp, start - CALLFRAME_SIZ 42 sw zero, CALLFRAME_RA(sp) # clear ra for debugger 43 sw zero, CALLFRAME_SP(sp) # clear fp for debugger 44 move s0, a0 # save argc 45 move s1, a1 # save argv 46 47 jal _C_LABEL(flushcache) 48 nop 49 50 la a0, _C_LABEL (edata) # clear BSS 51 move a1, zero 52 la a2, _C_LABEL (end) 53 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 54 subu a2, a2, a0 55 56 move a0, s0 # restore argc 57 jal _C_LABEL(main) # main(unsigned int) 58 move a1, s1 # restore argv 59 60XLEAF(_rtt) 61 jal _C_LABEL(cpu_reboot) # failed, reboot 62 nop 63END(start) 64 65LEAF(flushcache) 66 li t0, 0x80000000 67 addu t1, t0, 32*1024 /* flush 32KB */ 68 subu t1, t1, 0x100 /* per 256 bytes */ 69 701: 71 /* flush I-cache */ 72 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x000(t0) 73 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x020(t0) 74 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x040(t0) 75 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x060(t0) 76 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x080(t0) 77 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0a0(t0) 78 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0c0(t0) 79 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0e0(t0) 80 81 /* flush D-cache */ 82 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x000(t0) 83 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x020(t0) 84 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x040(t0) 85 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x060(t0) 86 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x080(t0) 87 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0a0(t0) 88 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0c0(t0) 89 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0e0(t0) 90 91 bne t0, t1, 1b 92 addu t0, t0, 0x100 93 94 j ra 95 nop 96END(flushcache) 97