machdep.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)machdep.c	4.8	ULTRIX	3/7/91";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1986,87,88,89 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.	*
 *									*
 ************************************************************************/

/************************************************************************
 * Modification history: /sys/vax/machdep.c
 *
 * 24-Feb-91	jsd
 *	new allocation scheme for gateway screen buffers
 *
 * 4-Sep-90	dlh
 *	added vector processor support code
 *
 * 31-Aug-90	paradis
 *	Changed restart inhibit code from 'if' to 'switch' (more
 *	modular); added VAX9000 support for clearing restart
 *	inhibit.
 *
 * 03-Aug-90	rafiey (Ali Rafieymehr)
 *	Added support for VAX9000.
 *
 * 09-Nov-89 -- jaw
 * 	change references to maxcpu to smp.
 *
 * 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. The buffer 
 *	cache must be the last allocated data for this to work. 
 *
 * 25 Jul 89 -- chet
 *	Change unmount and cache flushing code in boot()
 *
 * 24-July-89 -- Alan Frechette
 *	Moved all the crashdump code to a new file. The new file
 *	containing the crashdump code is "/sys/sys/crashdump.c".
 *
 * 20-Jul-89 jaw
 *	move non-vax code to sys area.
 *
 * 19-Jun-89 -- condylis
 *	Tightened up unmounting of file systems in boot().
 *
 * 14 Jun 89 -- chet
 *	Make buffer header allocations based on maxcpu (uniprocessor
 *	or multiprocessor).
 *
 * 12-Jun-89	bp
 *	Repaired valloc of kmemusage to be dependent on CLSIZE units.
 *	Changed cpu_ip_intr to recognize kernel memory allocator TB
 *	synchronization requests.
 *	
 * 12-Jun-1989 -- jaw
 *  	IP interrupts doing reschedule (AST) need to set runrun flag.
 *
 * 12-Jun-1989 -- gg
 *	In dumpsys() added a check for the presence dumpdev.
 *
 * 07-Jun-1989 -- Tim Burke
 *    Modified gendump() to dump to MSCP (ra) disks.  This change 
 *    needed because ra disks can be within a range of major numbers.
 *
 * 25-May-89 -- fred (Fred Canter_
 *	Correct a mismerge. Remove two extra lines of code from the
 *	default case in gendump().
 *
 * 24-May-89	darrell
 *	Changed the #include for cpuconf.h to find it in it's new home --
 *	sys/machine/common/cpuconf.h
 *
 * 24-May-89	darrell
 *	Removed the v_ prefix from all cpusw fields, removed cpup from any
 *	arguments being passed in function args.  cpup is now defined
 *	globally -- as part of the new cpusw.
 *
 * 12-May-89 -- darrell
 *	Merged V3.1 changes.
 *
 * 03-May-1989 -- gmm (merged from v3.1)
 * 	Added support for TMII. If cpu_sub_subtype indicates SB_TMII, 
 * 	use the parameters for a 90 nsec chip for delay.
 *
 * 10-Apr-89 -- gmm
 *	Fixed the path for kdb.h with the new source tree layout
 *
 * 06-Apr-89 -- prs
 *      Added SMP accounting lock in boot().
 *
 * 15-Feb-1989 -- darrell
 *	Added a case for VAX_60 to badaddr to disable mbus errors while
 *	doing a badaddr.
 *
 * 14-Feb-1989 -- prs
 *	Modified boot() to not sync out a remote accounting gnode when
 *	panicing. During a panic, some network interfaces shutdown before 
 *	calling boot().
 *
 * 26-Jan-89	jaw
 *	fix up start/stop cpu.
 *
 * 10-Jan-89 -- kong
 *	Added Rigel (VAX 6400) support.  Cleaned up microdelay routines
 *	by allowing them to be called at any IPL.
 *
 * 16-Jan-89 - jaw
 *	Bug in accounting.  When doing a reboot, if we panic once then
 *	don't try to turn off accouting the second time "boot" is called.
 *
 * 12-Jan-89 - jaw
 *	change to printf for attached processors so clists are not
 *	used.
 *
 * 1-Jan-1989 -- Fred Canter
 *	Modified gendump() to allow crash dumps to disks on either
 *	SCSI bus (even if root is on the opposite bus).
 *
 * 30-Dec-1988 -- Fred Canter
 *	Added reset of SCSI and ST506 I/O controllers to crash dump
 *	path (dumpsys) as required by thge VMB boot driver.
 *
 * 18-Nov-88 -- darrell
 *	Fixed a bug where the unit number of the dump device needed to
 *	be multiplied by 100 before being passed to VMB for Firefoxes
 *
 * 10-Oct-88 -- jaw
 *	initialize Istack variable on boot cpudata.
 *
 * 10-Oct-88 -- jaw
 *	replace switch_to_master with general routine switch_affinity
 *
 * 29-Sep-88 -- darrell
 *	Firefox Cleanup.  Removed Firefox specific code that called
 *	fccons_init.
 *
 * 19-Aug-88 -- miche
 *	Interrupt cpu goes through free_cpu and hold_cpu to
 *	hold and free processors.  This is coordinated with swtch
 *	We still need a routine which intr's everybody.
 *
 * 18-Jun-88 -- jaw  change to new cpu data format.
 *
 * 27-Apr-88 -- prs
 *      Enhanced code that turns accounting off in boot().
 *
 * 27 Apr 88 -- chet
 *	Add SMP buffer cache support.
 *
 * 27 Jan 88 -- gmm
 *	Added the new routine intrpt_cpu() to be used for causing an IP
 *	interrupt. Rewrote most of cpu_ip_intr() to conform to the new IPI
 *	interface definition.
 *
 * 27 Jan 88 -- us
 *	Added support for malloced network.  
 *
 * 21 Jan 88 -- jmartin
 *	Replace calls to the (inline) functions clearseg and copyseg
 *	respectively with blkclr (or bzero) and blkcpy (or bcopy).
 *	Establish a window in process memory through which a parent
 *	can write to (and read from) the memory of the child.  This
 *	window is UPAGES*NBPG bytes located between the u-area and the
 *	user stack.  Remove the following entities: CMAP1, CADDR1,
 *	CMAP2, CADDR2, Vfmap, vfutl, clearseg, copyseg.  Redefine
 *	Forkmap and forkutl.  Change the computation for the location
 *	of USRSTACK and the size of the process page table.
********************************************************************
		SMP changes above 
*********************************************************************
 *
 * 25-Sep-1988 -- Fred Canter
 *	Clean up comments.
 *
 * 19-Aug-1988 -- Fred Canter
 *	Removed last of PVAX BTD$ kludge.
 *
 * 30-July-1988 -- Fred Canter
 *	Fixed a bug in the PVAX microdelay routine. Caused delay to
 *	be 3 times what it should be if DELAY() called from probe.
 *	Caches not enabled yet when probe executed.
 *
 * 22-Jul-88 -- darrell
 *	Added IP interrupt support for VAX60 (Firefox).
 *
 * 13-Jul-88 -- chet
 *	Account for system table demand on physical memory
 *	in the buffer cache allocation in startup().
 *	Remove old code that ignored param.c parameter values.
 *	Add debugging messages and parameters for buffer cache allocation.
 *	Calculate usrptsize in startup().
 *
 * 28-June-1988 -- tresvik
 *      Move filling of installation specific rpb information from here
 *      to autoconf.c.  This is necessary to support get the
 *      ws_display_type for the LYNX which isn't filled in until
 *      lxprobe.
 *
 * 13-Jun-88 -- chet
 *	Added configurable buffer cache support
 *
 * 10-Jun-1988		Mark Parenti
 *	Modified signal mask so that SIGCONT can be ignored/blocked
 *	(POSIX 12.3)
 *
 * 08-Jun-88 -- fred (Fred Canter)
 *	Adjust microdelay routine for 90ns CPU and caches off.
 *
 * 07-Jun-88 -- fred (Fred Canter)
 *	Bug fix for cvs_cache_on global undefined if VAX420 not configured.
 *
 * 07-Jun-88 -- darrell
 *	Added Firefox support.
 *
 * 19-May-88 -- fred (Fred Canter)
 *	Improved microdelay routine for CVAXstar/PVAX (VAX420).
 *
 * 27-Apr-1988		David E. Eiche			DEE0032
 *	Modified generic dump code for all devices that use the
 *	Unibus structures to compare against the device name in
 *	the ubdinit structure.  This allows kernels built with
 *	"disk ran at mscp drive n" to dump.  Also made the check
 *	for the correct genericconf table entry more specific.
 *
 * 27-Apr-88 prs
 *      Enhanced code that turns accounting off in boot().
 *
 * 26-Apr-88    jaw
 *	Add VAX8820 support.
 *
 * 15-Apr-1988		Robin
 *	Added SII to allow dumps to rf disks.
 *
 * 07-Apr-1988		David E. Eiche			DEE0028
 *	Add code to enable dumping to the HSC.
 *
 * 4-Apr-88 jaa
 *	calculate and allocate swapmap in swapconf from now on
 *
 * 24-Mar-88 Robin (for Larry C.)
 *	moved setcache to autoconf to insure I/O space is mapped before
 *	init_main is called.  This fixes a problem introduced by the
 *	14-Mar-88 change (see note below).
 *
 * 15-May-88 tresvik
 *	move rpb initialization of cpu, cpusub, and ws_display_type
 *	to after vcons_init calls.  Need ws_display_type to be able
 *	to sense the environment during installation.  This should all
 *	move to getsysinfo in the future.
 *
 * 14-Mar-88 larry
 *	Move configure to init_main.c so that scs sysaps start up first.
 *
 * 8-Mar-88 jaa
 *     	Added variable usrptsize, now configurable by sysadm.
 *
 * 12-Feb-88 fred (Fred Canter)
 *	Changes for VAX420 (CVAXstar/PVAX) support.
 *
 * 5-Feb-88 tresvik
 *	increase MINMEM from 3 Meg to 4 Meg (hopefully temporarily)
 *
 * 19-Jan-88 -- jaw
 *	added calypso support.  Also moved in intrcpu into file from locore.s
 *
 * 15-Jan-88 Larry Palmer
 *	mbmap and nmbclusters are gone due to malloced mbufs.
 *	Also removed inclusion of ioctl.h and mbuf.h headers
 *	as we keep getting "too many defines from the preprocessor
 *
 * 14-Jan-1988 Tresvik
 *	Map up to a maximum of VMBINFOPAGES instead of all of the
 *	vmbinfo stack in high memory.  Only mapped access to vmb_info
 *	and ci ucode is needed anyway.  
 *
 *	Display the fact that physmem is being reduced, due to a small
 *	system page table, in a less frightful way.  The old way prompts
 *	too much undue concern.
 *
 * 11-Jan-1988  	Todd M. Katz
 *	Optionally invoke the SCS shutdown routine following synchronization
 *	of all disks.   The SCS shutdown routine disables all local ports.
 *	This automatically terminates all paths to all remote systems and
 *	provides the means for remote system discovery of this termination.
 *
 *	The SCS shutdown routine is indirectly invoked through the variable
 *	scs_disable.  It is only invoked if scs_disable has been initialized
 *	with the address of the SCS shutdown routine.  Such initialization
 *	occurs during SCS initialization itself which takes place during
 *	probing of the very first adapter requiring SCS for proper functioning.
 *
 * 12-11-87	Robin L. and Larry C.
 *      Added portclass/kmalloc support to the system.
 *
 * 28-Jul-87 -- prs
 *      Added code to gendump to allow dumping to an AIO device
 *      on a BI.
 *
 *
 * 11-Nov-87 -- prs
 *	Fixed a partial dump problem that would overwrite into
 *	the next partition.
 *
 * 14-Sep-87 -- afd
 *	Changed Mayfair CPMBX write to be a byte write rather than a short.
 *
 * 21-Jul-87 -- prs, Robin
 *	Removed ioctl call to get partition table information in
 *	dumpsys(). init_main.c now initializes part info.
 *
 * 25-Jun-87 -- prs
 *	Fixed netdump for consistent VAXstar dumps.
 *
 * 25-Jun-87 -- Robin
 *	Added code to get the dump partition size out of the system
 *	and not do a ioctl into the disk driver.  This insures that
 *	the IPL will not drop.
 *	
 * 02-Jun-87 -- logcher
 *	Added GSYNCG and crfree before GRELE of acctp to flush
 *	delayed write buffers.
 *
 * 20-Apr-87 -- afd
 *	Include ka650.h for Mayfair (after ubareg.h).
 *	Don't need to coerce types on ka650 console program mail box.
 *	Changed name CVAXQ to VAX3600 for Mayfair.
 *	microdelay now calls processor specific routines thru the cpu switch.
 *	There are now a few different routines which use
 *		different hardware features to accomplish micro delays.
 *
 * 25-Mar-87 -- logcher
 *	Change the hard coded /etc/init to /bin/init
 *
 * 19-Mar-87 -- prs
 *	Added partial crash dump code to the network dump routine 
 *	netdump.
 *
 * 18-Mar-87 -- logcher
 *	Added network dumping.
 *
 * 06-Mar-87 -- afd
 *	Added CPU specific support for Mayfair/CVAX.
 *
 * 13-Feb-87 -- Chase
 * 	change computation of nmbclusters to stay consistent with the
 *	formula	in /sys/vax/genassym.c.
 *
 * 12-Feb-87 -- depp
 *	Changed the sizing of dmempt
 *
 * 12-Feb-87 -- pmk
 *	Changed 3 gendump cprintf's for clearer meaning. Bar
 *
 * 15-Jan-87 -- Chase
 *	change dmemmap size to 512
 *
 * 15-jan-87 -- koehler
 *	change the calculation for the number of gnodes.
 *
 * 08-Jan-87 -- prs
 *	Added check to boot() to ensure a gnode has a mount device
 *	associated with it before an update is attempted.
 *
 * 16-Dec-86 -- prs
 *	Added code to boot() that turns accounting off if running. This
 *	allows the usr file system to umounted cleanly during shutdown.
 *
 * 04-Dec-86 -- prs
 *	Added conditional to allow the gendump routine to work on a
 *	microVAX I
 *
 * 04-Dec-86 -- Robin Lewis
 *	Removed the quota calls associated with setting login limits.  Login 
 *	limit code is now independent from MAXUSER,cpu type, and src code.
 *	(see /upgrade data file)
 *
 * 11-Sept-86  --  Tim Burke
 *	Reduce maxclistusers from 128 to 75 in order to tie up fewer resources.
 *
 * 30-Aug-86 -- fred (Fred Canter)
 *	Added/fixed comments in microdelay routine.
 *	Fixed crash dumps for VAXstar.
 *
 * 14-Aug-86 -- tresvik
 *	removed CAN BE HALTED message for MVAX II and VAXstar
 *	Physmem fixed again to act as memory size limit
 *	plug in CPU and CPU_SUBTYPE to the RPB for installation
 *	
 * 07-Aug-86 -- jaw	fixed microdelay to reflex change in VAX SRM
 *	to the ipl of the interval timer interrupt.
 *
 * 06-Aug-86 -- jaw	fixed baddaddr to work on running system.
 *	Also fixes to ka8800 reboot code.
 *
 *  5-Aug-86 -- fred (Fred Canter)
 *	Added VAXstar console program mail box support.
 *
 * 23-Jul-86 -- prs
 *	Removed the generic config table genericconf.
 *	The genericconf table is now built in conf.c. This will
 *	ensure that the table will only contain configured drivers.
 *
 * 26-Jul-86 -- bglover
 *	Append first startup printfs to startup mesg in error logger
 *
 * 18-Jun-86 -- fred (Fred Canter)
 *	Changes for VAXstar kernel support.
 *
 * 13-Jun-86 -- tresvik
 *	added support for network boot and installation by saving the
 *	address of vmb_info in the RPB for use be a user level program
 *	misc, fixes to Physmem, which got redefined to do something
 *	different.  It can now be preset to set an artificial top of
 *	memory as well as keep track of the actual amount for use by the
 *	sizer.  Increase min memory from 2 Meg to 3 Meg.
 *
 *  9-jun-86 -- bjg
 *	Set appendflg to log startup messages
 *
 *  2-Jun-86 -- depp
 *	Added passthough of "u.u_code" for SIGSEGV (see modification note
 *	"24 Feb 86 -- depp" below.
 *
 * 22-May-86 -- prs
 *	Added saving of u_area to partial dump code.
 *
 * 07-May-86 -- bjg
 *	Remove logstart() call; moved to clock.c.
 *
 * 16-Apr-86 -- darrell
 *	now calling badaddr with the macro BADADDR.
 *
 * 15-Apr-86 -- afd
 *	Re-wrote most of startup().  This changed the way we allocate
 *	system data structures.  The amount of space for "nbufs"
 *	is now calculated more intelligently.  The algorithm for
 *	this came from Berkeley 4.3.
 *
 *	The global variable "endofmem" now contains the last
 *	kernel virtual address that was used.
 *
 * 09 Apr 86 -- prs
 * 	Added common dump code taken from drivers to dumpsys.
 *	Also, added the generic dump routine, gendump, and
 *	partial crash dump support.