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Fix for machines which need to enlarge the kernel address space, at least
1GB i386 machines needs this.  The fix is heavily based on Jason Thorpe's
found in NetBSD.  Here is his original commit message:

Instead of checking vm_physmem[<physseg>].pgs to determine if
uvm_page_init() has completed, add a boolean uvm.page_init_done,
and test against that.  Use this same boolean (rather than
pmap_initialized) in pmap_growkernel() to determine if we are
being called via uvm_page_init() to grow the kernel address space.

This fixes a problem on some i386 configurations where pmap_init()
itself was needing to have the kernel page table grown, and since
pmap_initialized was not yet set to TRUE, pmap_growkernel() was
choosing the wrong code path.

/*	$OpenBSD: uvm.h,v 1.9 2001/04/10 06:59:12 niklas Exp $	*/
/*	$NetBSD: uvm.h,v 1.16 1999/06/21 17:25:11 thorpej Exp $	*/

/*
 *
 * Copyright (c) 1997 Charles D. Cranor and Washington University.
 * 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 Charles D. Cranor and
 *      Washington University.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
 *
 * from: Id: uvm.h,v 1.1.2.14 1998/02/02 20:07:19 chuck Exp
 */

#ifndef _UVM_UVM_H_
#define _UVM_UVM_H_

#include <uvm/uvm_extern.h>

#include <uvm/uvm_stat.h>

/*
 * pull in prototypes
 */

#include <uvm/uvm_amap.h>
#include <uvm/uvm_aobj.h>
#include <uvm/uvm_fault.h>
#include <uvm/uvm_glue.h>
#include <uvm/uvm_km.h>
#include <uvm/uvm_loan.h>
#include <uvm/uvm_map.h>
#include <uvm/uvm_object.h>
#include <uvm/uvm_page.h>
#include <uvm/uvm_pager.h>
#include <uvm/uvm_pdaemon.h>
#include <uvm/uvm_swap.h>
#ifdef UVM_SWAP_ENCRYPT
#include <uvm/uvm_swap_encrypt.h>
#endif

/*
 * pull in VM_NFREELIST
 */
#include <machine/vmparam.h>

/*
 * uvm structure (vm global state: collected in one structure for ease
 * of reference...)
 */

struct uvm {
	/* vm_page related parameters */
		/* vm_page queues */
	struct pglist page_free[VM_NFREELIST];	/* unallocated pages */
	struct pglist page_active;	/* allocated pages, in use */
	struct pglist page_inactive_swp;/* pages inactive (reclaim or free) */
	struct pglist page_inactive_obj;/* pages inactive (reclaim or free) */
	simple_lock_data_t pageqlock;	/* lock for active/inactive page q */
	simple_lock_data_t fpageqlock;	/* lock for free page q */
	boolean_t page_init_done;	/* TRUE if uvm_page_init() finished */
		/* page daemon trigger */
	int pagedaemon;			/* daemon sleeps on this */
	struct proc *pagedaemon_proc;	/* daemon's pid */
	simple_lock_data_t pagedaemon_lock;
		/* page hash */
	struct pglist *page_hash;	/* page hash table (vp/off->page) */
	int page_nhash;			/* number of buckets */
	int page_hashmask;		/* hash mask */
	simple_lock_data_t hashlock;	/* lock on page_hash array */

	/* anon stuff */
	struct vm_anon *afree;		/* anon free list */
	simple_lock_data_t afreelock; 	/* lock on anon free list */

	/* static kernel map entry pool */
	vm_map_entry_t kentry_free;	/* free page pool */
	simple_lock_data_t kentry_lock;

	/* aio_done is locked by uvm.pagedaemon_lock and splbio! */
	struct uvm_aiohead aio_done;	/* done async i/o reqs */

	/* pager VM area bounds */
	vaddr_t pager_sva;		/* start of pager VA area */
	vaddr_t pager_eva;		/* end of pager VA area */

	/* swap-related items */
	simple_lock_data_t swap_data_lock;

	/* kernel object: to support anonymous pageable kernel memory */
	struct uvm_object *kernel_object;
};

extern struct uvm uvm;

/*
 * historys
 */

#ifdef _KERNEL
UVMHIST_DECL(maphist);
UVMHIST_DECL(pdhist);
#endif /* _KERNEL */

/*
 * vm_map_entry etype bits:
 */

#define UVM_ET_OBJ		0x01	/* it is a uvm_object */
#define UVM_ET_SUBMAP		0x02	/* it is a vm_map submap */
#define UVM_ET_COPYONWRITE 	0x04	/* copy_on_write */
#define UVM_ET_NEEDSCOPY	0x08	/* needs_copy */

#define UVM_ET_ISOBJ(E)		(((E)->etype & UVM_ET_OBJ) != 0)
#define UVM_ET_ISSUBMAP(E)	(((E)->etype & UVM_ET_SUBMAP) != 0)
#define UVM_ET_ISCOPYONWRITE(E)	(((E)->etype & UVM_ET_COPYONWRITE) != 0)
#define UVM_ET_ISNEEDSCOPY(E)	(((E)->etype & UVM_ET_NEEDSCOPY) != 0)

/*
 * macros
 */

#ifdef _KERNEL

/*
 * UVM_UNLOCK_AND_WAIT: atomic unlock+wait... front end for the 
 * (poorly named) thread_sleep_msg function.
 */

#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
#define UVM_UNLOCK_AND_WAIT(event,lock,intr,msg, timo) \
	thread_sleep_msg(event,lock,intr,msg, timo)
#else
#define UVM_UNLOCK_AND_WAIT(event,lock,intr,msg, timo) \
	thread_sleep_msg(event,NULL,intr,msg, timo)
#endif

/*
 * UVM_PAGE_OWN: track page ownership (only if UVM_PAGE_TRKOWN)
 */

#if defined(UVM_PAGE_TRKOWN)
#define UVM_PAGE_OWN(PG, TAG) uvm_page_own(PG, TAG)
#else
#define UVM_PAGE_OWN(PG, TAG) /* nothing */
#endif /* UVM_PAGE_TRKOWN */

/*
 * pull in inlines
 */

#include <uvm/uvm_amap_i.h>
#include <uvm/uvm_fault_i.h>
#include <uvm/uvm_map_i.h>
#include <uvm/uvm_page_i.h>
#include <uvm/uvm_pager_i.h>

#endif /* _KERNEL */

#endif /* _UVM_UVM_H_ */