254 lines
7.1 KiB
C
254 lines
7.1 KiB
C
/* $NetBSD: locore2.c,v 1.16 1997/05/14 16:13:31 gwr 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 <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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#include <sys/exec_aout.h>
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#include <vm/vm.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/mon.h>
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#include <machine/pte.h>
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#include <machine/pmap.h>
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#include <machine/obio.h>
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#include <machine/machdep.h>
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#include <sun3/sun3/interreg.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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char *esym; /* DDB */
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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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* XXX: Need to do something about <m68k/include/cpu.h>
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*/
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int cputype = 1; /* CPU_68030 */
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int mmutype = -1; /* 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((struct exec));
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static void _vm_init __P((struct exec *kehp));
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#if defined(DDB) && !defined(SYMTAB_SPACE)
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static void _save_symtab __P((struct exec *kehp));
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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(kehp)
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struct exec *kehp; /* kernel exec header */
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{
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int x, *symsz, *strsz;
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char *endp;
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char *errdesc = "?";
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/*
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* First, sanity-check the exec header.
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*/
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if ((kehp->a_midmag & 0xFFF0) != 0x0100) {
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errdesc = "magic";
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goto err;
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}
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/* Boundary between text and data varries a little. */
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x = kehp->a_text + kehp->a_data;
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if (x != (edata - kernel_text)) {
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errdesc = "a_text+a_data";
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goto err;
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}
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if (kehp->a_bss != (end - edata)) {
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errdesc = "a_bss";
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goto err;
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}
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if (kehp->a_entry != (int)kernel_text) {
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errdesc = "a_entry";
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goto err;
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}
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if (kehp->a_trsize || kehp->a_drsize) {
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errdesc = "a_Xrsize";
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goto err;
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}
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/* The exec header looks OK... */
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/* Check the symtab length word. */
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endp = end;
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symsz = (int*)endp;
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if (kehp->a_syms != *symsz) {
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errdesc = "a_syms";
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goto err;
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}
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endp += sizeof(int); /* past length word */
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endp += *symsz; /* past nlist array */
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/* Sanity-check the string table length. */
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strsz = (int*)endp;
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if ((*strsz < 4) || (*strsz > 0x80000)) {
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errdesc = "strsize";
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goto err;
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}
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/* Success! We have a valid symbol table! */
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endp += *strsz; /* past strings */
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esym = endp;
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return;
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err:
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mon_printf("_save_symtab: bad %s\n", errdesc);
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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(kehp)
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struct exec *kehp; /* kernel exec header */
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{
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vm_offset_t nextva;
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/*
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* First, reserve 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;
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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(kehp);
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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 = _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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bzero((caddr_t)proc0paddr, 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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/*
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* Call pmap_bootstrap() so that we may begin using
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* pmap_enter_kernel() and pmap_bootstrap_alloc().
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*/
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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(keh)
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struct exec keh; /* kernel exec header */
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{
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/* First, Clear BSS. */
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bzero(edata, end - edata);
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/* set v_handler, get boothowto */
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sunmon_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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/* handle kernel mapping, pmap_bootstrap(), etc. */
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_vm_init(&keh);
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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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