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entry.S revision 1.1 
      1 /*	$NetBSD: entry.S,v 1.1 2011/03/03 05:59:37 kiyohara Exp $	*/
      2 /*
      3  * Copyright (c) 2011 KIYOHARA Takashi
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25  * POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sh3/asm.h>
     29 #include <sh3/locore.h>
     30 #include <sh3/mmu_sh3.h>
     31 #include <sh3/mmu_sh4.h>
     32 
     33 #if defined(SH3) && defined(SH4)
     34 #error "mmeye port don't support SH3,SH4 common kernel."
     35 #elif defined(SH3)
     36 #define RAM_BEGIN	0x8c000000	/* Area3 */
     37 #define RAM_SIZE	0x01000000	/* 16M */
     38 #elif defined(SH4)
     39 #define RAM_BEGIN	0x88000000	/* Area2 */
     40 #define RAM_SIZE	0x04000000	/* 64M */
     41 #endif
     42 
     43 #define	INIT_STACK	(RAM_BEGIN + RAM_SIZE - 0x00001000)
     44 
     45 NENTRY(start)
     46 	/* Set SP to initial position */
     47 	mov.l	XLtmpstk, r15
     48 
     49 	__INTR_MASK(r0, r1)
     50 
     51 	/* Set Register Bank to Bank 0 */
     52 	mov.l	SR_init, r0
     53 	ldc	r0, sr
     54 
     55 	xor	r0, r0
     56 	MOV	(MMUCR, r2)
     57 	mov.l	r0, @r2		/* MMU OFF */
     58 
     59 	bra	start1
     60 	nop
     61 	.align	2
     62 SR_init:	.long	0x500000F0
     63 REG_SYMBOL(MMUCR)
     64 start1:
     65 
     66 #if defined(SH4)
     67 	/* Copy boot image from _LOADADDR to ___start */
     68 	mov.l	_LOADADDR, r1
     69 	mov.l	___end, r0
     70 	mov.l	___start, r3
     71 	sub	r3, r0
     72 	add	#4, r0		/* size of bytes to be copied */
     73 	shlr2	r0		/* number of long word */
     74 1:
     75 	mov.l	@r1+, r4
     76 	mov.l	r4, @r3
     77 	add	#4, r3
     78 	dt	r0		/* decrement and Test */
     79 	bf	1b
     80 	/* boot image copy end */
     81 #endif
     82 
     83 	mov.l	XLmain, r0
     84 	jmp	@r0		/* jump to main() */
     85 	nop
     86 
     87 		.align	2
     88 
     89 _LOADADDR:	.long	0x88010000	/* loaded here by 1st loader. */
     90 ___start:	.long	start
     91 ___end:		.long	_end
     92 XLtmpstk:	.long	INIT_STACK
     93 XLmain:		.long	_C_LABEL(main)
     94