start.S revision 1.4
1 /* $NetBSD: start.S,v 1.4 2007/07/25 14:11:06 tsutsui 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <mips/asm.h> 40 #include <mips/cache_r4k.h> 41 42 LEAF(start) 43 .set noreorder 44 .set mips3 45 #ifdef __GP_SUPPORT__ 46 la gp, _C_LABEL (_gp) 47 #endif 48 la sp, start - CALLFRAME_SIZ 49 sw zero, CALLFRAME_RA(sp) # clear ra for debugger 50 sw zero, CALLFRAME_SP(sp) # clear fp for debugger 51 move s0, a0 # save argc 52 move s1, a1 # save argv 53 54 jal _C_LABEL(flushcache) 55 nop 56 57 la a0, _C_LABEL (edata) # clear BSS 58 move a1, zero 59 la a2, _C_LABEL (end) 60 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 61 subu a2, a2, a0 62 63 move a0, s0 # restore argc 64 jal _C_LABEL(main) # main(unsigned int) 65 move a1, s1 # restore argv 66 67 XLEAF(_xtt) 68 jal _C_LABEL(cpu_reboot) # failed, reboot 69 nop 70 END(start) 71 72 LEAF(flushcache) 73 li t0, 0x80000000 74 addu t1, t0, 32*1024 /* flush 32KB */ 75 subu t1, t1, 0x100 /* per 256 bytes */ 76 77 1: 78 /* flush I-cache */ 79 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x000(t0) 80 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x020(t0) 81 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x040(t0) 82 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x060(t0) 83 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x080(t0) 84 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0a0(t0) 85 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0c0(t0) 86 cache CACHE_R4K_I | CACHEOP_R4K_INDEX_INV, 0x0e0(t0) 87 88 /* flush D-cache */ 89 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x000(t0) 90 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x020(t0) 91 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x040(t0) 92 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x060(t0) 93 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x080(t0) 94 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0a0(t0) 95 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0c0(t0) 96 cache CACHE_R4K_D | CACHEOP_R4K_INDEX_WB_INV, 0x0e0(t0) 97 98 bne t0, t1, 1b 99 addu t0, t0, 0x100 100 101 j ra 102 nop 103 END(flushcache) 104
Indexes created Sun Sep 28 12:09:53 GMT 2025