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      1 /*	$NetBSD: locore.S,v 1.21 2021/02/26 02:18:56 thorpej Exp $	*/
      2 /*	$OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $	*/
      3 
      4 /*
      5  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      6  * Copyright (C) 1995, 1996 TooLs GmbH.
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by TooLs GmbH.
     20  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #include "opt_ddb.h"
     36 #include "opt_lockdebug.h"
     37 #include "opt_modular.h"
     38 #include "opt_multiprocessor.h"
     39 #include "opt_ppcparam.h"
     40 #include "assym.h"
     41 
     42 #include <sys/syscall.h>
     43 
     44 #include <machine/param.h>
     45 #include <machine/psl.h>
     46 #include <machine/trap.h>
     47 #include <machine/asm.h>
     48 
     49 #include <powerpc/spr.h>
     50 #include <powerpc/oea/spr.h>
     51 
     52 #include "ksyms.h"
     53 
     54 /*
     55  * Some instructions gas doesn't understand (yet?)
     56  */
     57 #define	bdneq	bdnzf 2,
     58 
     59 /*
     60  * cache bit
     61  */
     62 #define	HID0_BTCD	(1<<1)
     63 #define	HID0_BHTE	(1<<2)
     64 #define	HID0_SIED	(1<<7)
     65 #define	HID0_DCI	(1<<10)
     66 #define	HID0_ICFI	(1<<11)
     67 #define	HID0_DCE	(1<<14)
     68 #define	HID0_ICE	(1<<15)
     69 
     70 /*
     71  * Globals
     72  */
     73 GLOBAL(startsym)
     74 	.long	0			/* start symbol table */
     75 GLOBAL(endsym)
     76 	.long	0			/* end symbol table */
     77 
     78 /*
     79  * This symbol is here for the benefit of kvm_mkdb, and is supposed to
     80  * mark the start of kernel text.
     81  */
     82 	.text
     83 	.globl	_C_LABEL(kernel_text)
     84 _C_LABEL(kernel_text):
     85 
     86 /*
     87  * Startup entry.  Note, this must be the first thing in the text
     88  * segment!
     89  */
     90 	.text
     91 	.globl	__start
     92 __start:
     93 	li	0,0
     94 	mtmsr	0			/* Disable FPU/MMU/exceptions */
     95 	isync
     96 
     97 /* compute end of kernel memory */
     98 #if NKSYMS || defined(DDB) || defined(MODULAR)
     99 	lis	7,_C_LABEL(startsym)@ha
    100 	addi	7,7,_C_LABEL(startsym)@l
    101 	stw	3,0(7)
    102 	lis	7,_C_LABEL(endsym)@ha
    103 	addi	7,7,_C_LABEL(endsym)@l
    104 	stw	4,0(7)
    105 #else
    106 	lis	4,_C_LABEL(end)@ha
    107 	addi	4,4,_C_LABEL(end)@l
    108 #endif
    109 
    110 	INIT_CPUINFO(4,1,9,0)
    111 
    112 	lis	3,__start@ha
    113 	addi	3,3,__start@l
    114 
    115 	bl	_C_LABEL(initppc)
    116 
    117 /* enable internal i/d-cache */
    118 	mfpvr	9
    119 	rlwinm	9,9,16,16,31
    120 	cmpwi	%r9,1
    121 	beq	3f			/* not needed for 601 */
    122 	mfspr	11,SPR_HID0
    123 	andi.	0,11,HID0_DCE
    124 	ori	11,11,HID0_ICE|HID0_DCE
    125 	ori	8,11,HID0_ICFI
    126 	bne	1f			/* don't invalidate the D-cache */
    127 	ori	8,8,HID0_DCI		/* unless it wasn't enabled */
    128 1:
    129 	sync
    130 	mtspr	SPR_HID0,8		/* enable and invalidate caches */
    131 	sync
    132 	mtspr	SPR_HID0,11		/* enable caches */
    133 	sync
    134 	isync
    135 	cmpwi	%r9,4			/* check for 604 */
    136 	cmpwi	%cr1,%r9,9		/* or 604e */
    137 	cmpwi	%cr2,%r9,10		/* or mach5 */
    138 	cror	2,2,6
    139 	cror	2,2,10
    140 	bne	3f
    141 	ori	11,11,HID0_SIED|HID0_BHTE /* for 604[e], enable */
    142 	bne	2,2f
    143 	ori	11,11,HID0_BTCD
    144 2:
    145 	mtspr	SPR_HID0,11
    146 3:
    147 	sync
    148 	isync
    149 
    150 	bl	_C_LABEL(main)
    151 
    152 loop:
    153 	b	loop			/* not reached */
    154 
    155 	.globl	_C_LABEL(enable_intr)
    156 _C_LABEL(enable_intr):
    157 	mfmsr	3
    158 	ori	4,3,PSL_EE@l
    159 	mtmsr	4
    160 	blr
    161 
    162 	.globl	_C_LABEL(disable_intr)
    163 _C_LABEL(disable_intr):
    164 	mfmsr	3
    165 	andi.	4,3,~PSL_EE@l
    166 	mtmsr	4
    167 	blr
    168 
    169 /*
    170  * Pull in common switch / setfault code.
    171  */
    172 #include <powerpc/powerpc/locore_subr.S>
    173 
    174 /*
    175  * Pull in common trap vector code.
    176  */
    177 #include <powerpc/powerpc/trap_subr.S>
    178 
    179 /*
    180  * Pull in common pio / bus_space code.
    181  */
    182 #include <powerpc/powerpc/pio_subr.S>
    183