/* $NetBSD: walnut_start.S,v 1.24 2018/07/15 05:16:43 maxv Exp $ */
/* $OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* 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.
*/
#undef PPC_4XX_NOCACHE
#include "opt_ddb.h"
#include "opt_lockdebug.h"
#include "opt_modular.h"
#include "opt_multiprocessor.h"
#include "opt_ppcarch.h"
#include "opt_ppcparam.h"
#include "assym.h"
#include "ksyms.h"
#include <sys/syscall.h>
#include <machine/param.h>
#include <machine/psl.h>
#include <machine/trap.h>
#include <machine/asm.h>
#include <powerpc/spr.h>
#include <powerpc/ibm4xx/spr.h>
#include <powerpc/ibm4xx/dcr4xx.h>
/* Function pointer for requesting board_config_data from openbios*/
#define BOARD_CFG_FP 0xFFFE0B50
/*
* Some instructions gas doesn't understand (yet?)
*/
#define bdneq bdnzf 2,
/*
* 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:
b 1f
/* Reserve some space for info_block required for IBM eval board bootloader */
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
1:
/* Get the board_config_data from openbios */
lis %r3,BOARD_CFG_FP@h
ori %r3,%r3,BOARD_CFG_FP@l
lwz %r0,0x0(%r3)
mtctr %r0
bctrl /* call the xcoff function */
mr %r31,%r3 /* Save value in r31 */
li %r0,0
mtmsr %r0 /* Disable FPU/MMU/exceptions */
isync
/* PPC405GP errata, item #58.
* Load string instructions may write incorrect data into the last GPR
* targeted in the operation.
* Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 */
mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */
mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */
/*
* CPU detect.
*
*/
__start_cpu0:
#ifdef PPC_4XX_NOCACHE
/* Disable all caches for physical addresses */
li %r0,0
#else
/* Allow cacheing for only the first 2GB of RAM */
lis %r0,0xffff
#endif
mtdccr %r0
mticcr %r0
/* Invalidate all TLB entries */
tlbia
sync
isync
/* get start of bss */
lis %r3,_C_LABEL(_edata)-4@ha
addi %r3,%r3,_C_LABEL(_edata)-4@l
/* get end of kernel memory */
lis %r8,_C_LABEL(end)@ha
addi %r8,%r8,_C_LABEL(end)@l
/* zero bss */
li %r4,0
2: stwu %r4,4(%r3)
cmpw %r3,%r8
bne+ 2b
#if NKSYMS || defined(DDB) || defined(MODULAR)
/* If we had symbol table location we'd store it here and would've adjusted r8 here */
lis %r7,_C_LABEL(startsym)@ha
addi %r7,%r7,_C_LABEL(startsym)@l
stw %r8,0(%r7)
lis %r7,_C_LABEL(endsym)@ha
addi %r7,%r7,_C_LABEL(endsym)@l
stw %r8,0(%r7)
#endif
/* Set kernel MMU context. */
li %r0,KERNEL_PID
mtpid %r0
sync
INIT_CPUINFO(%r8,%r1,%r9,%r0)
mr %r4,%r8
lis %r3,__start@ha
addi %r3,%r3,__start@l
mr %r6,%r31 /* info_block address */
bl _C_LABEL(initppc)
bl _C_LABEL(main)
loop: b loop /* XXX not reached */
#include <powerpc/ibm4xx/4xx_locore.S>