/*- * SPDX-License-Identifier: BSD-3-Clause * * 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. * 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. */ #ifndef _MACHINE_VMPARAM_H_ #define _MACHINE_VMPARAM_H_ 1 /* * Machine dependent constants for 386. */ /* * Virtual memory related constants, all in bytes */ #define MAXTSIZ (128UL*1024*1024) /* max text size */ #ifndef DFLDSIZ #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ #endif #ifndef MAXDSIZ #define MAXDSIZ (512UL*1024*1024) /* max data size */ #endif #ifndef DFLSSIZ #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ #endif #ifndef MAXSSIZ #define MAXSSIZ (64UL*1024*1024) /* max stack size */ #endif #ifndef SGROWSIZ #define SGROWSIZ (128UL*1024) /* amount to grow stack */ #endif /* * Choose between DENSE and SPARSE based on whether lower execution time or * lower kernel address space consumption is desired. Under PAE, kernel * address space is often in short supply. */ #ifdef PAE #define VM_PHYSSEG_SPARSE #else #define VM_PHYSSEG_DENSE #endif /* * 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 17 /* * Create one free page pool. Since the i386 kernel virtual address * space does not include a mapping onto the machine's entire physical * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default * pool, VM_FREEPOOL_DEFAULT. */ #define VM_NFREEPOOL 1 #define VM_FREEPOOL_DEFAULT 0 #define VM_FREEPOOL_DIRECT 0 /* * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages * that have physical addresses below 4G but are not accessible by ISA DMA, * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA * DMA. */ #define VM_NFREELIST 3 #define VM_FREELIST_DEFAULT 0 #define VM_FREELIST_DMA32 1 #define VM_FREELIST_LOWMEM 2 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */ /* * Always create DMA32 freelist if there is any memory above 4G. * Bounce dma is extremely fragile and simultaneously intensively * used. */ #define VM_DMA32_NPAGES_THRESHOLD 1 /* * The largest allocation size is 2MB under PAE and 4MB otherwise. */ #define VM_NFREEORDER_PAE 10 #define VM_NFREEORDER_NOPAE 11 #define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE #define VM_NFREEORDER i386_pmap_VM_NFREEORDER /* * Enable superpage reservations: 1 level. */ #ifndef VM_NRESERVLEVEL #define VM_NRESERVLEVEL 1 #endif /* * Level 0 reservations consist of 512 pages when PAE pagetables are * used, and 1024 pages otherwise. */ #ifndef VM_LEVEL_0_ORDER #define VM_LEVEL_0_ORDER_PAE 9 #define VM_LEVEL_0_ORDER_NOPAE 10 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE #define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER #else #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER #endif /* * Kernel physical load address. */ #ifndef KERNLOAD #define KERNLOAD (8 * 1024 * 1024) #endif /* !defined(KERNLOAD) */ /* * Virtual addresses of things. Derived from the page directory and * page table indexes from pmap.h for precision. * Because of the page that is both a PD and PT, it looks a little * messy at times, but hey, we'll do anything to save a page :-) */ #define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1) #define VM_MIN_KERNEL_ADDRESS 0 #define KERNBASE KERNLOAD #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) #define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1) #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) #define USRSTACK SHAREDPAGE #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0) #define VM_MIN_ADDRESS ((vm_offset_t)0) #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS #define PMAP_TRM_MAX_ADDRESS 0xffffffff #define PMAP_MAP_LOW (4 * 1024 * 1024) /* * KVA layout. The unit of the system allocation is single PDE, which * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs * to create the same memory map as non-PAE. * * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M), * normally disabled to catch NULL derefs. * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M). * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel * text + data and all kernel maps. Managed * by MI VM. * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed * to by PTmap. PTD[] recursively points * into PTmap. * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT, * IDT, TSS, LDT, trampoline code and stacks. * Managed by pmap_trm_alloc(). */ /* * How many physical pages per kmem arena virtual page. */ #ifndef VM_KMEM_SIZE_SCALE #define VM_KMEM_SIZE_SCALE (1) #endif /* * Optional floor (in bytes) on the size of the kmem arena. */ #ifndef VM_KMEM_SIZE_MIN #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) #endif /* * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the * kernel map rounded to the nearest multiple of the superpage size. */ #ifndef VM_KMEM_SIZE_MAX #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) #endif /* initial pagein size of beginning of executable file */ #ifndef VM_INITIAL_PAGEIN #define VM_INITIAL_PAGEIN 16 #endif #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ #ifndef VM_MAX_AUTOTUNE_MAXUSERS #define VM_MAX_AUTOTUNE_MAXUSERS 384 #endif #define SFBUF #define SFBUF_MAP #define SFBUF_CPUSET #define SFBUF_PROCESS_PAGE #define PMAP_HAS_DMAP 0 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; }) #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; }) /* * No non-transparent large page support in the pmap. */ #define PMAP_HAS_LARGEPAGES 0 /* * Need a page dump array for minidump. */ #define MINIDUMP_PAGE_TRACKING 1 #define MINIDUMP_STARTUP_PAGE_TRACKING 0 #endif /* _MACHINE_VMPARAM_H_ */
