/* $NetBSD: vmparam.h,v 1.14 2026/07/04 20:02:05 thorpej 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 _M68K_VMPARAM_H_ #define _M68K_VMPARAM_H_ /* * Common constants for m68k ports */ #define __USE_TOPDOWN_VM /* Some implemantations like jemalloc(3) require physical page size details. */ #if defined(__mc68010__) /* * As of now, there is only a single PAGE_SHIFT value here (11), * so don't define anything differently. */ #else #define MIN_PAGE_SHIFT 12 #define MAX_PAGE_SHIFT 13 #define MIN_PAGE_SIZE (1 << MIN_PAGE_SHIFT) #define MAX_PAGE_SIZE (1 << MAX_PAGE_SHIFT) #endif /* __mc68010__ */ #if defined(_KERNEL) #if !defined(_MODULE) || !defined(MIN_PAGE_SHIFT) /* * hp300 pmap derived m68k ports can use 4K or 8K pages. * (except HPMMU machines, that support only 4K page) * sun3 and sun3x use 8K pages. * sun2 has 2K pages. * The page size is specified by PGSHIFT in <machine/param.h>. * Override the PAGE_* definitions to be compile-time constants. */ #define PAGE_SHIFT PGSHIFT #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (PAGE_SIZE - 1) #endif #if defined(_MODULE) extern vaddr_t m68k_usrstack; #define USRSTACK m68k_usrstack #else /* * Virtual memory related constants, all in bytes * * Note: the 68010 has only 16MB of user virtual address space, * so we need to be extremely conservative about those limits * on those systems. */ #if defined(__mc68010__) #define __M68K_DFLT_MAXTSIZ (5*1024*1024) #define __M68K_DFLT_DFLDSIZ (4*1024*1024) #define __M68K_DFLT_MAXDSIZ (6*1024*1024) #define __M68K_DFLT_DFLSSIZ (512*1024) #define __M68K_DFLT_MAXSSIZ (4*1024*1024) #else #define __M68K_DFLT_MAXTSIZ (64*1024*1024) #define __M68K_DFLT_DFLDSIZ (64*1024*1024) #define __M68K_DFLT_MAXDSIZ (256*1024*1024) #define __M68K_DFLT_DFLSSIZ (2*1024*1024) #define __M68K_DFLT_MAXSSIZ (64*1024*1024) #endif #ifndef MAXTSIZ #define MAXTSIZ __M68K_DFLT_MAXTSIZ /* max text size */ #endif #ifndef DFLDSIZ #define DFLDSIZ __M68K_DFLT_DFLDSIZ /* initial data size limit */ #endif #ifndef MAXDSIZ #define MAXDSIZ __M68K_DFLT_MAXDSIZ /* max data size */ #endif #ifndef DFLSSIZ #define DFLSSIZ __M68K_DFLT_DFLSSIZ /* initial stack size limit */ #endif #ifndef MAXSSIZ #define MAXSSIZ __M68K_DFLT_MAXSSIZ /* max stack size */ #endif /* * User VM map constraints. * * N.B. For the 68851 and 68030+, user-space and kernel-space are * completely separated by separate root pointers and they have * completely separate page tables. So, for those systems, the * entire 4GB virtual address space is available for user-space, * although we skip the very last page to avoid overflow confusion. * * On the 68010, the basic constraint is the 24-bit address space. * Note that there's no integer overflow concern in this case, so * we don't skip the last virtual page since the address space is * at such a premium. * * Platforms with other constrains: define these values before including * this file. */ #define VM_MIN_ADDRESS ((vaddr_t)0) #ifndef VM_MAX_ADDRESS #if defined(__mc68010__) #define VM_MAX_ADDRESS ((vaddr_t)0x01000000) #else #define VM_MAX_ADDRESS ((vaddr_t)0-PAGE_SIZE) #endif #endif #define VM_MAXUSER_ADDRESS VM_MAX_ADDRESS /* * USRSTACK is the top (end) of the user stack. The m68k stack * is pre-decrement, so the first address touched in a stack access * is USRSTACK-1. * * We simply put the user stack at the very top of the user address space. */ #define USRSTACK VM_MAX_ADDRESS /* * Kernel map constraints. * * Comment above about 68851/68030/etc. applies here, as well. The * limit of the kernel address space is dictated by any static mappings * that might be placed near the top of the address space. * * Other platforms (e.g. Sun2/Sun3) have different constraints, and * define them before including this file. */ #ifndef VM_MIN_KERNEL_ADDRESS #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0) #endif #ifndef VM_MAX_KERNEL_ADDRESS extern vaddr_t kernel_virtual_max; #define VM_MAX_KERNEL_ADDRESS (kernel_virtual_max) #endif /* * Size of phys_map. phys_map is used by vmapbuf() to map user I/O * buffers into kernel space for physio. No single mapping request * will ever be larger than MAXPHYS. On a typical system, the most * pressure that phys_map will ever experience is during a multi-disk * parallel fsck, if needed at boot time. * * On 68010 (which is severely address-space constrained), the * default is sufficient for 4 concurrent MAXPHYS operations. * For everyone else, the default is sufficient for 16. * * Other platforms (e.g. Sun2/Sun3) may have different constraints, * and define them before including this file. */ #ifndef VM_PHYS_SIZE #if defined(__mc68010__) #define VM_PHYS_SIZE (256 * 1024) #else #define VM_PHYS_SIZE (1 * 1024 * 1024) #endif #endif #if defined(__mc68010__) #define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024) #endif /* * Default to a single physical memory segment. */ #ifndef VM_PHYSSEG_MAX #define VM_PHYSSEG_MAX 1 #endif #ifndef VM_PHYSSEG_STRAT #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH #endif /* * Default to a single physical memory free list. */ #ifndef VM_NFREELIST #define VM_NFREELIST 1 #endif #ifndef VM_FREELIST_DEFAULT #define VM_FREELIST_DEFAULT 0 #endif #endif /* _MODULE */ #endif /* _KERNEL */ #endif /* _M68K_VMPARAM_H_ */
