/* $NetBSD: locore.S,v 1.3 2022/05/07 04:12:54 rin Exp $ */ /* * Taken from src/sys/arch/powerpc/ibm4xx/openbios/locore.s: * NetBSD: locore.S,v 1.17 2021/03/30 01:57:20 rin 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. */ #ifdef PPC_4XX_NOCACHE #error Not tested. #endif #include "assym.h" #include "ksyms.h" #ifdef _KERNEL_OPT #include "opt_ddb.h" #include "opt_modular.h" #include "opt_ppcparam.h" #endif #include <machine/param.h> #include <machine/asm.h> #include <machine/psl.h> #include <machine/trap.h> #include <powerpc/spr.h> #include <powerpc/ibm4xx/spr.h> #include <powerpc/ibm4xx/dcr4xx.h> /* * 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 %r0,0 mtmsr %r0 /* Disable FPU/MMU/exceptions */ isync /* * Errata 213: Incorrect data may be flushed from the data cache. * Cores: PPC405D5X1, PPC405D5X2 * Workaround: #1, CCR0 modification sequence #2 * Note: Meaning of bits we need to set is undocumented. */ sync mfspr %r0,SPR_CCR0 /* XXXclang: mfccr0 %r0 */ oris %r0,%r0,0x50000000@h mtspr SPR_CCR0,%r0 /* XXXclang: mtccr0 %r0 */ 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 */ li %r0,0 mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */ mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */ #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 > 0 || 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>
