xref: /src/sys/arch/prep/prep/locore.S

/*	$NetBSD: locore.S,v 1.1 2001/06/01 04:20:05 simonb Exp $	*/
/*	$OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $	*/

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "opt_ddb.h"
#include "fs_kernfs.h"
#include "opt_ipkdb.h"
#include "opt_lockdebug.h"
#include "opt_multiprocessor.h"
#include "assym.h"

#include <sys/syscall.h>

#include <machine/param.h>
#include <machine/pmap.h>
#include <machine/psl.h>
#include <machine/trap.h>
#include <machine/asm.h>

/*
 * Some instructions gas doesn't understand (yet?)
 */
#define	bdneq	bdnzf 2,

/*
 * cache bit
 */
#define	HID0_BTCD	(1<<1)
#define	HID0_BHTE	(1<<2)
#define	HID0_SIED	(1<<7)
#define	HID0_DCI	(1<<10)
#define	HID0_ICFI	(1<<11)
#define	HID0_DCE	(1<<14)
#define	HID0_ICE	(1<<15)

#define	INTSTK	(8*1024)	/* 8K interrupt stack */
#define	SPILLSTK 1024		/* 1K spill stack */

/*
 * Globals
 */
GLOBAL(startsym)
	.long	0			/* start symbol table */
GLOBAL(endsym)
	.long	0			/* end symbol table */
GLOBAL(proc0paddr)
	.long	0			/* proc0 p_addr */

GLOBAL(intrnames)
	.asciz	"clock", "irq1", "irq2", "irq3"
	.asciz	"irq4", "irq5", "irq6", "irq7"
	.asciz	"irq8", "irq9", "irq10", "irq11"
	.asciz	"irq12", "irq13", "irq14", "irq15"
	.asciz	"irq16", "irq17", "irq18", "irq19"
	.asciz	"irq20", "irq21", "irq22", "irq23"
	.asciz	"irq24", "irq25", "irq26", "irq27"
	.asciz	"irq28", "softnet", "softclock", "softserial"
GLOBAL(eintrnames)
	.align	4
GLOBAL(intrcnt)
	.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
	.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
GLOBAL(eintrcnt)

/*
 * File-scope for locore.S
 */
	.data
idle_u:
	.long	0			/* fake uarea during idle after exit */

/*
 * This symbol is here for the benefit of kvm_mkdb, and is supposed to
 * mark the start of kernel text.
 */
	.text
	.globl	_C_LABEL(kernel_text)
_C_LABEL(kernel_text):

/*
 * Startup entry.  Note, this must be the first thing in the text
 * segment!
 */
	.text
	.globl	__start
__start:
	li	0,0
	mtmsr	0			/* Disable FPU/MMU/exceptions */
	isync

/* compute end of kernel memory */
	lis	8,_C_LABEL(end)@ha
	addi	8,8,_C_LABEL(end)@l
#if defined(DDB) || defined(KERNFS)
	lis	7,_C_LABEL(startsym)@ha
	addi	7,7,_C_LABEL(startsym)@l
	stw	3,0(7)
	lis	7,_C_LABEL(endsym)@ha
	addi	7,7,_C_LABEL(endsym)@l
	stw	4,0(7)
	mr	8,4			/* end of sysbol table */
#endif
	li	9,PGOFSET
	add	8,8,9
	andc	8,8,9
	addi	8,8,NBPG
	lis	9,idle_u@ha
	stw	8,idle_u@l(9)
	addi	8,8,USPACE		/* space for idle_u */
	lis	9,_C_LABEL(proc0paddr)@ha
	stw	8,_C_LABEL(proc0paddr)@l(9)
	addi	1,8,USPACE-FRAMELEN	/* stackpointer for proc0 */
	mr	4,1			/* end of mem reserved for kernel */
	xor	0,0,0
	stwu	0,-16(1)		/* end of stack chain */

	lis	3,__start@ha
	addi	3,3,__start@l

	bl	_C_LABEL(initppc)

/* enable internal i/d-cache */
	mfpvr	9
	rlwinm	9,9,16,16,31
	cmpi	0,9,1
	beq	3f			/* not needed for 601 */
	mfspr	11,1008
	andi.	0,11,HID0_DCE
	ori	11,11,HID0_ICE|HID0_DCE
	ori	8,11,HID0_ICFI
	bne	1f			/* don't invalidate the D-cache */
	ori	8,8,HID0_DCI		/* unless it wasn't enabled */
1:
	sync
	mtspr	1008,8			/* enable and invalidate caches */
	sync
	mtspr	1008,11			/* enable caches */
	sync
	isync
	cmpi	0,9,4			/* check for 604 */
	cmpi	1,9,9			/* or 604e */
	cmpi	2,9,10			/* or mach5 */
	cror	2,2,6
	cror	2,2,10
	bne	3f
	ori	11,11,HID0_SIED|HID0_BHTE /* for 604[e], enable */
	bne	2,2f
	ori	11,11,HID0_BTCD
2:
	mtspr	1008,11
3:
	sync
	isync

	bl	_C_LABEL(main)

loop:
	b	loop			/* not reached */

	.globl	_C_LABEL(enable_intr)
_C_LABEL(enable_intr):
	mfmsr	3
	ori	3,3,PSL_EE@l
	mtmsr	3
	blr

	.globl	_C_LABEL(disable_intr)
_C_LABEL(disable_intr):
	mfmsr	3
	andi.	3,3,~PSL_EE@l
	mtmsr	3
	blr

/*
 * Pull in common switch / setfault code.
 */
#include <powerpc/powerpc/locore_subr.S>

/*
 * Pull in common trap vector code.
 */
#include <powerpc/powerpc/trap_subr.S>