241 lines
6.7 KiB
C
241 lines
6.7 KiB
C
/* $NetBSD: locore2.c,v 1.26 2001/09/05 14:18:10 tsutsui Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Jeremy Cooper.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/user.h>
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#define ELFSIZE 32
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#include <sys/exec_elf.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <machine/db_machdep.h>
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#include <machine/dvma.h>
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#include <machine/idprom.h>
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#include <machine/leds.h>
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#include <machine/mon.h>
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#include <machine/pmap.h>
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#include <machine/pte.h>
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#include <sun3/sun3/interreg.h>
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#include <sun3/sun3/machdep.h>
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#include <sun3/sun3/vector.h>
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/* This is defined in locore.s */
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extern char kernel_text[];
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/* These are defined by the linker */
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extern char etext[], edata[], end[];
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int nsym;
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char *ssym, *esym;
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/*
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* XXX: m68k common code needs these...
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* ... but this port does not need to deal with anything except
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* an mc68030, so these two variables are always ignored.
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*/
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int cputype = CPU_68030;
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int mmutype = MMU_68030;
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/*
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* Now our own stuff.
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*/
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struct user *proc0paddr; /* proc[0] pcb address (u-area VA) */
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extern struct pcb *curpcb;
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/* First C code called by locore.s */
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void _bootstrap __P((void));
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static void _vm_init __P((void));
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#if defined(DDB) && !defined(SYMTAB_SPACE)
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static void _save_symtab __P((void));
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/*
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* Preserve DDB symbols and strings by setting esym.
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*/
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static void
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_save_symtab()
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{
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int i;
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Elf_Ehdr *ehdr;
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Elf_Shdr *shp;
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vaddr_t minsym, maxsym;
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/*
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* Check the ELF headers.
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*/
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ehdr = (void *)end;
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0 ||
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ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
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mon_printf("_save_symtab: bad ELF magic\n");
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return;
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}
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/*
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* Find the end of the symbols and strings.
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*/
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maxsym = 0;
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minsym = ~maxsym;
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shp = (Elf_Shdr *)(end + ehdr->e_shoff);
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for (i = 0; i < ehdr->e_shnum; i++) {
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if (shp[i].sh_type != SHT_SYMTAB &&
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shp[i].sh_type != SHT_STRTAB) {
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continue;
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}
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minsym = min(minsym, (vaddr_t)end + shp[i].sh_offset);
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maxsym = max(maxsym, (vaddr_t)end + shp[i].sh_offset +
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shp[i].sh_size);
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}
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nsym = 1;
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ssym = (char *)ehdr;
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esym = (char *)maxsym;
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}
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#endif /* DDB && !SYMTAB_SPACE */
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/*
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* This function is called from _bootstrap() to initialize
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* pre-vm-sytem virtual memory. All this really does is to
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* set virtual_avail to the first page following preloaded
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* data (i.e. the kernel and its symbol table) and special
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* things that may be needed very early (proc0 upages).
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* Once that is done, pmap_bootstrap() is called to do the
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* usual preparations for our use of the MMU.
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*/
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static void
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_vm_init()
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{
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vaddr_t nextva;
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/*
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* First preserve our symbol table, which might have been
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* loaded after our BSS area by the boot loader. However,
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* if DDB is not part of this kernel, ignore the symbols.
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*/
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esym = end + 4;
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#if defined(DDB) && !defined(SYMTAB_SPACE)
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/* This will advance esym past the symbols. */
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_save_symtab();
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#endif
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/*
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* Steal some special-purpose, already mapped pages.
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* Note: msgbuf is setup in machdep.c:cpu_startup()
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*/
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nextva = m68k_round_page(esym);
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/*
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* Setup the u-area pages (stack, etc.) for proc0.
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* This is done very early (here) to make sure the
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* fault handler works in case we hit an early bug.
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* (The fault handler may reference proc0 stuff.)
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*/
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proc0paddr = (struct user *) nextva;
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nextva += USPACE;
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memset((caddr_t)proc0paddr, 0, USPACE);
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proc0.p_addr = proc0paddr;
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/*
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* Now that proc0 exists, make it the "current" one.
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*/
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curproc = &proc0;
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curpcb = &proc0paddr->u_pcb;
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/* This does most of the real work. */
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pmap_bootstrap(nextva);
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}
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/*
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* This is called from locore.s just after the kernel is remapped
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* to its proper address, but before the call to main(). The work
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* done here corresponds to various things done in locore.s on the
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* hp300 port (and other m68k) but which we prefer to do in C code.
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* Also do setup specific to the Sun PROM monitor and IDPROM here.
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*/
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void
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_bootstrap()
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{
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/* First, Clear BSS. */
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memset(edata, 0, end - edata);
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/* Set v_handler, get boothowto. */
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sunmon_init();
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/* Handle kernel mapping, pmap_bootstrap(), etc. */
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_vm_init();
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/*
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* Find and save OBIO mappings needed early,
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* and call some init functions.
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*/
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obio_init();
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/*
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* Point interrupts/exceptions to our vector table.
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* (Until now, we use the one setup by the PROM.)
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*
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* This is done after obio_init() / intreg_init() finds
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* the interrupt register and disables the NMI clock so
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* it will not cause "spurrious level 7" complaints.
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* Done after _vm_init so the PROM can debug that.
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*/
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setvbr((void **)vector_table);
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/* Interrupts are enabled later, after autoconfig. */
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/*
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* Find the IDPROM and copy it to memory.
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* Needs obio_init and setvbr earlier.
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*/
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idprom_init();
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/*
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* Turn on the LEDs so we know power is on.
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* Needs idprom_init and obio_init earlier.
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*/
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leds_init();
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}
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