/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * Copyright (c) 1994 John S. Dyson * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. * 4. 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: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30 * $FreeBSD$ */ #ifndef _MACHINE_VMPARAM_H_ #define _MACHINE_VMPARAM_H_ /* * Virtual memory related constants, all in bytes */ #ifndef MAXTSIZ #define MAXTSIZ (1*1024*1024*1024) /* max text size */ #endif #ifndef DFLDSIZ #define DFLDSIZ (128*1024*1024) /* initial data size limit */ #endif #ifndef MAXDSIZ #define MAXDSIZ (1*1024*1024*1024) /* max data size */ #endif #ifndef DFLSSIZ #define DFLSSIZ (128*1024*1024) /* initial stack size limit */ #endif #ifndef MAXSSIZ #define MAXSSIZ (1*1024*1024*1024) /* max stack size */ #endif #ifndef SGROWSIZ #define SGROWSIZ (128*1024) /* amount to grow stack */ #endif /* * The physical address space is densely populated. */ #define VM_PHYSSEG_DENSE /* * The number of PHYSSEG entries must be one greater than the number * of phys_avail entries because the phys_avail entry that spans the * largest physical address that is accessible by ISA DMA is split * into two PHYSSEG entries. */ #define VM_PHYSSEG_MAX 64 /* * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool * from which physical pages are allocated and VM_FREEPOOL_DIRECT is * the pool from which physical pages for small UMA objects are * allocated. */ #define VM_NFREEPOOL 3 #define VM_FREEPOOL_CACHE 2 #define VM_FREEPOOL_DEFAULT 0 #define VM_FREEPOOL_DIRECT 1 /* * Create two free page lists: VM_FREELIST_DEFAULT is for physical * pages that are above the largest physical address that is * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages * that are below that address. */ #define VM_NFREELIST 2 #define VM_FREELIST_DEFAULT 0 #define VM_FREELIST_ISADMA 1 /* * An allocation size of 16MB is supported in order to optimize the * use of the direct map by UMA. Specifically, a cache line contains * at most four TTEs, collectively mapping 16MB of physical memory. * By reducing the number of distinct 16MB "pages" that are used by UMA, * the physical memory allocator reduces the likelihood of both 4MB * page TLB misses and cache misses caused by 4MB page TLB misses. */ #define VM_NFREEORDER 12 /* * Only one memory domain. */ #ifndef VM_NDOMAIN #define VM_NDOMAIN 1 #endif /* * Disable superpage reservations. */ #ifndef VM_NRESERVLEVEL #define VM_NRESERVLEVEL 0 #endif /* * Address space layout. * * UltraSPARC I and II implement a 44 bit virtual address space. The address * space is split into 2 regions at each end of the 64 bit address space, with * an out of range "hole" in the middle. UltraSPARC III implements the full * 64 bit virtual address space, but we don't really have any use for it and * 43 bits of user address space is considered to be "enough", so we ignore it. * * Upper region: 0xffffffffffffffff * 0xfffff80000000000 * * Hole: 0xfffff7ffffffffff * 0x0000080000000000 * * Lower region: 0x000007ffffffffff * 0x0000000000000000 * * In general we ignore the upper region, and use the lower region as mappable * space. * * We define some interesting address constants: * * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and of the entire 64 bit * address space, mostly just for convenience. * * VM_MIN_DIRECT_ADDRESS and VM_MAX_DIRECT_ADDRESS define the start and end * of the direct mapped region. This maps virtual addresses to physical * addresses directly using 4mb tlb entries, with the physical address encoded * in the lower 43 bits of virtual address. These mappings are convenient * because they do not require page tables, and because they never change they * do not require tlb flushes. However, since these mappings are cacheable, * we must ensure that all pages accessed this way are either not double * mapped, or that all other mappings have virtual color equal to physical * color, in order to avoid creating illegal aliases in the data cache. * * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of * mappable kernel virtual address space. VM_MIN_KERNEL_ADDRESS is basically * arbitrary, a convenient address is chosen which allows both the kernel text * and data and the prom's address space to be mapped with 1 4mb tsb page. * VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the * amount of physical memory available. Each 4mb tsb page provides 1g of * virtual address space, with the only practical limit being available * phsyical memory. * * VM_MIN_PROM_ADDRESS and VM_MAX_PROM_ADDRESS define the start and end of the * prom address space. On startup the prom's mappings are duplicated in the * kernel tsb, to allow prom memory to be accessed normally by the kernel. * * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the * user address space. There are some hardware errata about using addresses * at the boundary of the va hole, so we allow just under 43 bits of user * address space. Note that the kernel and user address spaces overlap, but * this doesn't matter because they use different tlb contexts, and because * the kernel address space is not mapped into each process' address space. */ #define VM_MIN_ADDRESS (0x0000000000000000UL) #define VM_MAX_ADDRESS (0xffffffffffffffffUL) #define VM_MIN_DIRECT_ADDRESS (0xfffff80000000000UL) #define VM_MAX_DIRECT_ADDRESS (VM_MAX_ADDRESS) #define VM_MIN_KERNEL_ADDRESS (0x00000000c0000000UL) #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address) #define VM_MIN_PROM_ADDRESS (0x00000000f0000000UL) #define VM_MAX_PROM_ADDRESS (0x00000000ffffffffUL) #define VM_MIN_USER_ADDRESS (0x0000000000002000UL) #define VM_MAX_USER_ADDRESS (0x000007fe00000000UL) #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS) #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS) #define KERNBASE (VM_MIN_KERNEL_ADDRESS) #define PROMBASE (VM_MIN_PROM_ADDRESS) #define USRSTACK (VM_MAX_USER_ADDRESS) /* * Virtual size (bytes) for various kernel submaps. */ #ifndef VM_KMEM_SIZE #define VM_KMEM_SIZE (16*1024*1024) #endif /* * How many physical pages per KVA page allocated. * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) * is the total KVA space allocated for kmem_map. */ #ifndef VM_KMEM_SIZE_SCALE #define VM_KMEM_SIZE_SCALE (3) #endif /* * Initial pagein size of beginning of executable file. */ #ifndef VM_INITIAL_PAGEIN #define VM_INITIAL_PAGEIN 16 #endif #define UMA_MD_SMALL_ALLOC extern vm_offset_t vm_max_kernel_address; #endif /* !_MACHINE_VMPARAM_H_ */