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obs600_locore.S revision 1.1.4.2 
      1 /*	$NetBSD: obs600_locore.S,v 1.1.4.2 2010/05/30 05:16:44 rmind Exp $	*/
      2 /*
      3  * Copyright (c) 2009 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 #undef PPC_4XX_NOCACHE
     29 #define _NOREGNAMES
     30 
     31 #include "opt_ddb.h"
     32 #include "opt_ppcarch.h"
     33 #include "opt_ppcparam.h"
     34 #include "assym.h"
     35 #include "ksyms.h"
     36 
     37 #include <machine/param.h>
     38 #include <machine/psl.h>
     39 #include <machine/trap.h>
     40 #include <machine/asm.h>
     41 
     42 #include <powerpc/ibm4xx/spr.h>
     43 #include <powerpc/ibm4xx/pmap.h>
     44 
     45 
     46 /*
     47  * Globals
     48  */
     49 GLOBAL(proc0paddr)
     50 	.long	0			/* proc0 p_addr */
     51 
     52 /*
     53  * This symbol is here for the benefit of kvm_mkdb, and is supposed to
     54  * mark the start of kernel text.
     55  */
     56 	.text
     57 	.globl	_C_LABEL(kernel_text)
     58 _C_LABEL(kernel_text):
     59 
     60 /*
     61  * Kernel start routine for OpenBlockS600
     62  * this code is excuted at the very first after the kernel is loaded
     63  * by U-Boot.
     64  */
     65 	.text
     66 	.globl	__start
     67 __start:
     68 	mr	%r31, %r3		/* argc of 'go's */
     69 	mr	%r30, %r4		/* argv of 'go's */
     70 	mr	%r29, %r6		/* arg string of 'bootm's */
     71 
     72 	li	%r0, 0
     73 	mtmsr	%r0			/* Disable FPU/MMU/exceptions */
     74 	isync
     75 
     76 #ifdef PPC_4XX_NOCACHE
     77 	/* Disable all caches for physical addresses */
     78 	li	%r0, 0
     79 #else
     80 	/* Allow cacheing for only the first 2GB of RAM */
     81 	lis	%r0, 0xffff
     82 #endif
     83 	mtdccr	%r0
     84 	mticcr	%r0
     85 
     86 	/* Invalidate all TLB entries */
     87 	tlbia
     88 	sync
     89 	isync
     90 
     91 	/* get start of bss */
     92 	lis	%r3, _C_LABEL(_edata)-4@ha
     93 	addi	%r3, %r3, _C_LABEL(_edata)-4@l
     94 	/* get end of kernel memory */
     95 	lis	%r8, _C_LABEL(end)@ha
     96 	addi	%r8, %r8, _C_LABEL(end)@l
     97 	/* zero bss */
     98 	li	%r4, 0
     99 2:	stwu	%r4, %r4(3)
    100 	cmpw	%r3, %r8
    101 	bne+	2b
    102 
    103 #if NKSYMS || defined(DDB) || defined(MODULAR)
    104 	/* If we had symbol table location we'd store it here and would've adjusted r8 here */
    105 	lis	%r7, _C_LABEL(startsym)@ha
    106 	addi	%r7, %r7, _C_LABEL(startsym)@l
    107 	stw	%r8, 0(%r7)
    108 	lis	%r7, _C_LABEL(endsym)@ha
    109 	addi	%r7, %r7, _C_LABEL(endsym)@l
    110 	stw	%r8, 0(%r7)
    111 #endif
    112 
    113 	/* Set kernel MMU context. */
    114 	li	%r0, KERNEL_PID
    115 	mtpid	%r0
    116 	sync
    117 
    118 	INIT_CPUINFO(8,1,9,0)
    119 	mr	%r4, %r8
    120 
    121 	lis	%r3, __start@ha
    122 	addi	%r3, %r3, __start@l
    123 
    124 	mr	%r6, %r31		/* argc of 'go's */
    125 	mr	%r7, %r30		/* argv of 'go's */
    126 	mr	%r8, %r29		/* arg strings of 'bootm's */
    127 
    128 	bl	_C_LABEL(initppc)
    129 	bl	_C_LABEL(main)
    130 
    131 not_reached:
    132 	b	not_reached
    133 
    134 #include <powerpc/ibm4xx/4xx_locore.S>
    135