xref: /src/sys/arch/virt68k/include/vmparam.h

/*	$NetBSD: vmparam.h,v 1.3 2025/02/08 23:44:53 tsutsui Exp $	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: Utah $Hdr: vmparam.h 1.16 91/01/18$
 *
 *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
 */

#ifndef _VIRT68K_VMPARAM_H_
#define _VIRT68K_VMPARAM_H_

/*
 * Machine dependent constants for virt68k
 */

/*
 * Use common m68k definitions to define PAGE_SIZE and related constants.
 */
#include <m68k/vmparam.h>

/*
 * USRSTACK is the top (end) of the user stack.
 *
 * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
 * is for HPUX compatibility.  Why??  Because HPUX's debuggers
 * have the user's stack hard-wired at FFF00000 for post-mortems,
 * and we must be compatible...
 */
#define	USRSTACK	(-HIGHPAGES*PAGE_SIZE)	/* Start of user stack */
#define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
#define	P1PAGES		0x100000
#define	HIGHPAGES	(0x100000/PAGE_SIZE)

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(32*1024*1024)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(64*1024*1024)		/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		MAXDSIZ			/* max stack size */
#endif

/*
 * PTEs for mapping user space into the kernel for phyio operations.
 * One page is enough to handle 4Mb of simultaneous raw IO operations.
 */
#ifndef USRIOSIZE
#define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
#endif

/*
 * Mach derived constants
 */

/*
 * user/kernel map constants
 *
 * TT registers are used to map the I/O space (at 0xFF00.0000), so
 * the kernel virtual address space needs to end before that (with
 * room for the Sysmap, because that's where the Hibler pmap puts it).
 */
#define VM_MIN_ADDRESS		((vaddr_t)0)
#define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
#define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0xFF000000-PAGE_SIZE*NPTEPG))

/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)

/* # of kernel PT pages (initial only, can grow dynamically) */
#define VM_KERNEL_PT_PAGES	((vsize_t)2)

/*
 * Constants which control the way the VM system deals with memory segments.
 *
 * We generally assume there's just a single real memory segment on this
 * platform, but we need to be able to deal with a "hole" left by a RAM
 * disk if the loader provided one.  We optimize for the loader either
 * plopping the RAM disk immediately after the kernel image or at the end
 * of RAM, which would still leave us with a single large segment.
 */
#define	VM_PHYSSEG_MAX		4
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST

#define	VM_NFREELIST		1
#define	VM_FREELIST_DEFAULT	0

#define	__HAVE_PMAP_PHYSSEG

/*
 * pmap-specific data stored in the vm_physmem[] array.
 */
struct pmap_physseg {
	struct pv_header *pvheader;	/* pv table for this seg */
};

#endif /* _VIRT68K_VMPARAM_H_ */