1/* $NetBSD: locore.S,v 1.5 2002/05/09 12:32:55 uch Exp $ */ 2 3/*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36#include "opt_memsize.h" 37#include "assym.h" 38 39#include <sh3/asm.h> 40#include <sh3/locore.h> 41#include <sh3/exception.h> 42#include <sh3/mmu_sh4.h> 43#include <sh3/cache_sh4.h> 44 45/* 46 * void start(void) __attribute__((__noreturn__)): 47 * Kernel entry point. 48 */ 49NENTRY(start) 50 /* Set bootstrap stack pointer */ 51 mov.l _L.bootstrap_stack, r15 52 53 /* Mask all interrupt */ 54 __INTR_MASK(r0, r1) 55 56 /* 57 * Cache initialize. 58 * I/D-cache enable, P0, U0, P3 write-back P1 write-through. 59 */ 60 mov.l _L.sh4_icache_sync_all, r0 61 jsr @r0 62 nop 63 mov.l _L.CCR, r0 64 mov.l _L.CCRconfig, r1 65 mov.l r1, @r0 66 67 /* MMU off */ 68 mov.l _L.MMUCR, r0 69 xor r1, r1 70 mov.l r1, @r0 71 72 /* Make sure to change register bank 0 */ 73 mov #0x20, r1 74 stc sr, r0 75 swap.b r1, r1 76 swap.w r1, r1 77 not r1, r1 78 and r1, r0 79 ldc r0, sr /* SR.RB = 0 */ 80 81 /* Go! */ 82 mov.l _L.dreamcast_startup, r0 83 jmp @r0 84 nop 85 /* NOTREACHED */ 86 .align 2 87_L.dreamcast_startup: .long _C_LABEL(dreamcast_startup) 88_L.bootstrap_stack: .long _C_LABEL(start) 89_L.sh4_icache_sync_all: .long _C_LABEL(sh4_icache_sync_all) 90_L.CCR: .long SH4_CCR 91_L.CCRconfig: .long 0x00000909 92_L.MMUCR: .long SH4_MMUCR 93 .data 94 .align 2 95 .globl _C_LABEL(intrcnt), _C_LABEL(eintrcnt) 96 .globl _C_LABEL(intrnames), _C_LABEL(eintrnames) 97_C_LABEL(intrcnt): 98_C_LABEL(eintrcnt): 99_C_LABEL(intrnames): 100_C_LABEL(eintrnames): 101