startup.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)startup.c	4.11      (ULTRIX)  2/28/91";
#endif	lint

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/* ------------------------------------------------------------------ */
/* | Copyright Unpublished, MIPS Computer Systems, Inc.  All Rights | */
/* | Reserved.  This software contains proprietary and confidential | */
/* | information of MIPS and its suppliers.  Use, disclosure or     | */
/* | reproduction is prohibited without the prior express written   | */
/* | consent of MIPS.                                               | */
/* ------------------------------------------------------------------ */

/*
 * Modification History: startup.c
 *
 * 23-Feb-91	jsd
 *	new allocation scheme for gateway screen buffers
 *
 * 15-Nov-90	Randall Brown
 *	Fixed a bug in msize_bitmap where the for loop was not being 
 *	broken out of when the first bad page was hit.  Also changed
 *	the bitmaplen for REX roms.  The bitmaplen is now in bytes for
 *	those roms.
 *
 * 13-Sep-90	Joe Szczypek
 *	Added support for new 3max/3min TURBOchannel console callbacks.  If
 *	new console ROM present, use rex_getbitmap to get bitmap and bitmaplen,
 *	and use rex_getsystype to get systype.  Added a fourth argument as 
 *	input to startup.  This passes in the base address of the new callback
 *	vector dispatch table.  Save all four arguments in globals.
 * 
 * 17-Aug-90	Randall Brown
 *	Removed cpu check for DS3100 after cninit(), cninit() now works
 *	correctly on DS3100. 
 *
 * 09-Aug-90	Randall Brown
 *	Added support for 3min - DS_5000_100.
 *
 * 21-Jun-90	Paul Grist
 *	fixed bug in msize_bitmap. It was using btoc() to do
 *	calculation, this round up to the next page boundry, so when
 *	the bitmap doesn't fall on a 4k boundry it was putting back
 * 	unavialable memory, the result was the bitmap was marked usable
 *	and got stepped on. So on reboots the system thought it had no memory
 *
 * 01-May-90 -- Paul Grist
 *      Added support for mipsmate - DS_5100.
 *
 * 15-Feb-90 -- Robin
 *	Made a bug fix to allow the DS_5500 to size memory via the
 *	bitmap (same as the 5800).
 *
 * 19-Dec-89 -- Fred Canter
 *	Bug fix to last delta. Need 2 PTEs per buffer header not one.
 *
 * 18-Dec-89 -- burns
 *	Fixed check of nbuf against sysptsize to exclude the MAXMEM
 *	fudge factor which is incorrect for mips based systems.
 *
 * 12-Dec-89 -- burns
 *	Moved out sysptsize to param.c since it is now calculated
 *	based upon physmem from the config file. It needs to be
 *	set in the targetbuild directory, not in a binary file.
 *
 * 11-Nov-89 -- Randall Brown
 *	Moved when we call cninit() to after mapinit(), so that cninit() can
 *	do BADDADDR if it needs to.  Changed msize_bitmap to ignore the first
 *	2 long words if we are on a 3max.
 *
 * 10-Nov-89 -- jaw
 *	remove references to maxcpu.
 *
 * 16-Oct-89 -- Alan Frechette
 *	No longer dump out the buffer cache during a system crash
 *	for partial selective crash dumps. Save the PFN of the last 
 *	kernel page to dump out for the crashdump code. Readjusted
 *	the order of allocation so that the buffer cache is allocated
 *	last. The buffer cache must be the last allocated data for 
 *	this to work. 
 *
 * 13-Oct-89  -- gmm
 *	smp support
 *
 * 10-July-89 -- burns
 *	Added memory sizing via bitmap, and added afd's separate cpu
 *	switch troutines for sizing memory via badaddr probes or bitmap.
 *
 * 30-Jun-89 -- afd
 *	Call memsize routine (to size and clear memory) thru the cpu switch.
 *	Added 2 new memory sizing rotines: msize_baddr and msize_bitmap.
 *
 * 15-Jun-89 -- afd
 *	Call cpu_initialize() routine as soon as "cpup" is set up in startup().
 *  
 * 14-Jun-89 -- darrell
 *	Removed the splhigh in startup, as spl() cannot be called yet,
 *
 * 14 Jun 89 -- chet
 *	Make buffer header allocations based on maxcpu (uniprocessor
 *	or multiprocessor).
 *
 * 01-Jun-89 -- Kong
 *	Added a field in the "save_state" struct to store the value
 *	of "cpu".  This is to allow the ULTRIX installation program
 *	"finder" to determine the type of machine it is running on
 *	without doing a name list on the kernel.  "save_state" is
 *	initialised by "init_restartblk".
 *
 * 08-Jun-89 -- gmm
 *	Allocate (KMALLOC) the idle stack for boot cpu during startup
 *
 * 02-May-89 -- jaw, jmartin
 *	fix forkutl to work on mips.
 *
 * 20-May-89 -- Randall Brown
 *	added call to cninit(), so that the cons_swp is setup correctly.
 *	printf's can not be done before this call is executed.
 *
 * 17-Apr-89 -- afd
 *	Created "save_state" struct at the bottom of the ULTRIX startup stack.
 *	This struct contains a magic number and the address of "doadump".
 *	This allows people to force a memory dump from console mode when
 *	a system is hung.
 *
 * 07-Apr-89 -- afd
 *	Updated system_type routine.
 *	Don't need "system.h"; cpu & systype info is in cpuconf.h
 *	Added "cpuswitch_entry" routine to initialize the pointer into
 *	    the cpusw table (cpup).
 *
 * 07-Apr-89 -- kong
 *	Added global variable "qmapbase" which gets initialised to
 *	the physical address of the Qbus map registers.  Changed
 *	routine "mapinit" so that on a kn210, the last 32K bytes
 *	of physical memory is not used by the kernel, but is used
 *	by the Qbus as map registers.  Note that the Qbus map must
 *	sit on a 32Kb boundary.
 *
 * 24-Mar-89 -- burns
 *	Added ISIS specifics.
 *
 * 23-Mar-89 -- Kong
 *	Added variable "sysptsize" and initialize it to SYSPTSIZE.
 *	Some of the VAX i/o device drivers need it.
 *
 * 23-Feb-89 -- Kong
 *	Added variable "Physmem" so that the "sizer" program knows
 * 	the actual size of physical memory.
 *
 * 12-Jan-89 -- Kong
 *     .Added variable "cpu" whose value is defined in system.h.
 *	Determine on what we are running and properly initialize "cpu".
 *     .Based on the system type, initialize all the interrupt handler
 *	entry points in c0vec_tbl (in trap.c).  This way each different
 *	system can use different handlers.
 *     .Initialized the interrupt masks based on the type of system
 *	we're on.  This allows the different interrupt schemes of the
 *	different systems to use the same splxxx routines.
 *
 * 10 Nov 88 -- chet
 *	Add configurable buffer cache.
 *
 * 09-Nov-88 -- afd
 *	Get the "systype" word from the boot PROM, and save it in
 *	"cpu_systype".
 *	This is done in startup because it must be done before the first
 *	autoconfig printf so that the error log packet with config messages
 *	will have the systype in the header.
 *
 * 09-Sep-88 -- afd
 *	Cleanup startup msgs; no configuration printfs until after kmeminit(),
 *	  because the kernel printf routine does a km_alloc.
 *	Set & clear appendflg so that startup msgs get logged together.
 *	Set "printstate" to what level of printing is possible as the system
 *	  comes up.
 *	Call chk_cpe() after configuration is done (records cache parity errs).
 *
 */

#include "../machine/reg.h"
#include "../machine/pte.h"
#include "../machine/cpu.h"
#include "../machine/hwconf.h"
#include "../../machine/common/cpuconf.h"

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/user.h"
#include "../h/gnode.h"
#include "../h/dir.h"
#include "../h/kernel.h"
#include "../h/map.h"
#include "../h/vm.h"
#include "../h/proc.h"
#include "../h/buf.h"
#include "../h/reboot.h"
#include "../h/conf.h"
#include "../h/file.h"
#include "../h/text.h"
#include "../h/clist.h"
#include "../h/callout.h"
#include "../h/cmap.h"
#include "../h/mbuf.h"
#include "../h/quota.h"
#include "../h/cpudata.h"
#include "../fs/nfs/dnlc.h"
#include "../h/flock.h"
#include "../h/dump.h"
#include "../machine/param.h"
#include "../h/kmalloc.h"
#if PROFILING
#include "../h/prof.h"
#endif PROFILING

#include "../machine/entrypt.h"
#include "./assym.h"

extern Sysmaplimit;
unsigned Syssize;
extern	int sysptsize;			/* for device drivers to know */
extern struct kmemusage *kmemusage;
extern kmeminit();
extern  int     appendflg;		/* for logging startup messages */
u_int printstate = PROMPRINT;		/* what level of printf is available */
int	Physmem = 0;			/* Size of physical memory   */

#ifdef CACHETRICKS
unsigned short icachecnt[MAXCACHE/NBPG];
unsigned short dcachecnt[MAXCACHE/NBPG];
#endif CACHETRICKS
unsigned icachemask, dcachemask;
unsigned cpu_systype;			/* systype word in boot PROM */
int	cpu;				/* value defined in cpuconf.h */
struct	cpusw *cpup;			/* pointer to cpusw entry    */
int	splm[SPLMSIZE];			/* interrupt masks 	     */
struct cpusw *cpuswitch_entry();

int	qmapbase;			/* Physical address of Qbus map regs*/
extern  int rex_base;                   /* Base of ROM Executive callback 
					   table used by 3max and 3min */
extern  int rex_magicid;                /* Console type id */ 
char    bootctlr[2];
char	consmagic[4];
int	ub_argc;
char	**ub_argv;
int     console_magic;                  /* Console id */
struct  mem_bitmap rex_map[1];          /* allocate a mem_bitmap structure */

/*
 * Machine-dependent startup code.  The boot stack is still in use.
 * The kernel sp in proc 0 U area is setup on return.
 */
startup(argc, argv, envp, vector)
	int argc;
	char **argv;
	char **envp;
        char **vector;
{
	unsigned fpage;	/* first free physical page */
	int i; /* DEBUG */
	extern char end[], edata[];
	extern char utlbmiss[], eutlbmiss[];
	extern char exception[], eexception[];
	extern struct pte eSysmap[];
	extern icache_size, dcache_size;

	/*
	 * copy down exception vector code
	 */
	bcopy(utlbmiss, UT_VEC, eutlbmiss - utlbmiss);
	bcopy(exception, E_VEC, eexception - exception);
	bzero(edata, end - edata);	/* zero bss */
	/* initialize this cpu as boot processor */
	/*
	 * Get the "systype" word from the boot PROM, which contains
	 * the processor type, the system implementation type, firmware
	 * rev and hardware rev.
	 *
	 * Also set "cpu" (the ULTRIX system type) based on both
	 * processor type and system implementation type.
	 *
	 * Initialize "cpup" to point to the cpusw table entry for the system
	 * that we are currently running on.
	 *
	 * As soon as we have "cpup" set, call the cpu initialization routine
	 * to fill in the splm, interupt vector table, ipl mask, etc.
	 * This MUST be done before any spl routines can be called (thus before
	 * any printfs can be done).
	 */
	console_magic = (int)envp;  /* save console id */
	ub_argc = argc;
	ub_argv = argv;
	if(console_magic == REX_MAGIC) {
		rex_base = (int)vector;
		rex_magicid = (int)envp;
		cpu_systype = rex_getsystype();
	}
	else {
		rex_base = 0;
		rex_magicid=0;
		cpu_systype = xtob(prom_getenv("systype"));
	}

	cpu = system_type(cpu_systype);
	cpup = cpuswitch_entry(cpu);
	/*
	 * Cannot call spl() before cpu_initialize is called -- therefore
	 * printf's cannot be done before now.
	 */
	cpu_initialize();

	/* init_boot_cpu() will call splextreme, so make sure spls are setup */
	/* initialize this cpu as boot processor. 'cpu' should be setup
	   before calling init_boot_cpu */
	init_boot_cpu();

	config_cache();
	icachemask = (icache_size - 1) >> PGSHIFT;
	dcachemask = (dcache_size - 1) >> PGSHIFT;
	flush_cache();
	/*
	 * Acknowledge all interrupts
	 */