The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/vmparam.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  * Copyright (c) 1994 John S. Dyson
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * William Jolitz.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
   37  * $FreeBSD: stable/12/sys/i386/include/vmparam.h 336774 2018-07-27 18:34:20Z imp $
   38  */
   39 
   40 
   41 #ifndef _MACHINE_VMPARAM_H_
   42 #define _MACHINE_VMPARAM_H_ 1
   43 
   44 /*
   45  * Machine dependent constants for 386.
   46  */
   47 
   48 /*
   49  * Virtual memory related constants, all in bytes
   50  */
   51 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   52 #ifndef DFLDSIZ
   53 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   54 #endif
   55 #ifndef MAXDSIZ
   56 #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
   57 #endif
   58 #ifndef DFLSSIZ
   59 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   60 #endif
   61 #ifndef MAXSSIZ
   62 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   63 #endif
   64 #ifndef SGROWSIZ
   65 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   66 #endif
   67 
   68 /*
   69  * Choose between DENSE and SPARSE based on whether lower execution time or
   70  * lower kernel address space consumption is desired.  Under PAE, kernel
   71  * address space is often in short supply.
   72  */
   73 #ifdef PAE
   74 #define VM_PHYSSEG_SPARSE
   75 #else
   76 #define VM_PHYSSEG_DENSE
   77 #endif
   78 
   79 /*
   80  * The number of PHYSSEG entries must be one greater than the number
   81  * of phys_avail entries because the phys_avail entry that spans the
   82  * largest physical address that is accessible by ISA DMA is split
   83  * into two PHYSSEG entries. 
   84  */
   85 #define VM_PHYSSEG_MAX          17
   86 
   87 /*
   88  * Create one free page pool.  Since the i386 kernel virtual address
   89  * space does not include a mapping onto the machine's entire physical
   90  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
   91  * pool, VM_FREEPOOL_DEFAULT.
   92  */
   93 #define VM_NFREEPOOL            1
   94 #define VM_FREEPOOL_DEFAULT     0
   95 #define VM_FREEPOOL_DIRECT      0
   96 
   97 /*
   98  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
   99  * pages that are above the largest physical address that is
  100  * accessible by ISA DMA and VM_FREELIST_LOWMEM is for physical pages
  101  * that are below that address.
  102  */
  103 #define VM_NFREELIST            2
  104 #define VM_FREELIST_DEFAULT     0
  105 #define VM_FREELIST_LOWMEM      1
  106 
  107 #define VM_LOWMEM_BOUNDARY      (16 << 20)      /* 16MB ISA DMA limit */
  108 
  109 /*
  110  * The largest allocation size is 2MB under PAE and 4MB otherwise.
  111  */
  112 #ifdef PAE
  113 #define VM_NFREEORDER           10
  114 #else
  115 #define VM_NFREEORDER           11
  116 #endif
  117 
  118 /*
  119  * Enable superpage reservations: 1 level.
  120  */
  121 #ifndef VM_NRESERVLEVEL
  122 #define VM_NRESERVLEVEL         1
  123 #endif
  124 
  125 /*
  126  * Level 0 reservations consist of 512 pages when PAE pagetables are
  127  * used, and 1024 pages otherwise.
  128  */
  129 #ifndef VM_LEVEL_0_ORDER
  130 #if defined(PAE) || defined(PAE_TABLES)
  131 #define VM_LEVEL_0_ORDER        9
  132 #else
  133 #define VM_LEVEL_0_ORDER        10
  134 #endif
  135 #endif
  136 
  137 /*
  138  * Kernel physical load address.
  139  */
  140 #ifndef KERNLOAD
  141 #define KERNLOAD                (KERNPTDI << PDRSHIFT)
  142 #endif /* !defined(KERNLOAD) */
  143 
  144 /*
  145  * Virtual addresses of things.  Derived from the page directory and
  146  * page table indexes from pmap.h for precision.
  147  * Because of the page that is both a PD and PT, it looks a little
  148  * messy at times, but hey, we'll do anything to save a page :-)
  149  */
  150 
  151 #define VM_MAX_KERNEL_ADDRESS   VADDR(PTDPTDI, 0)
  152 
  153 #define VM_MIN_KERNEL_ADDRESS   0
  154 
  155 #define KERNBASE                KERNLOAD
  156 
  157 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  158 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  159 
  160 #define VM_MAXUSER_ADDRESS      VADDR(TRPTDI, 0)
  161 
  162 #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  163 #define USRSTACK                SHAREDPAGE
  164 
  165 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, 0)
  166 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  167 
  168 #define PMAP_TRM_MIN_ADDRESS    VM_MAXUSER_ADDRESS
  169 #define PMAP_TRM_MAX_ADDRESS    0xffffffff
  170 
  171 #define PMAP_MAP_LOW            VADDR(LOWPTDI, 0)
  172 
  173 /*
  174  * KVA layout.  The unit of the system allocation is single PDE, which
  175  * represents NBPDR bytes, aligned to NBPDR.  NBPDR is 4M for non-PAE
  176  * page tables, and 2M for PAE.  Addresses below are shown for non-PAE.
  177  *
  178  * 0x00000000 - 0x003fffff      Transient identity map of low memory (0-4M),
  179  *                              normally disabled to catch NULL derefs.
  180  * 0x00400000 - 0x007fffff      Fixed mapping of the low memory (4-8M).
  181  * 0x00800000 - 0xffbfffff      KERNBASE (VA) == KERNLOAD (PA), kernel
  182  *                              text + data and all kernel maps.  Managed
  183  *                              by MI VM.
  184  * 0xffc00000 - 0xffdfffff      Recursive kernel page table mapping, pointed
  185  *                              to by PTmap.  PTD[] recursively points
  186  *                              into PTmap.
  187  * 0xffe00000 - 0xffffffff      Kernel/User mode shared PDE, contains GDT,
  188  *                              IDT, TSS, LDT, trampoline code and stacks.
  189  *                              Managed by pmap_trm_alloc().
  190  */
  191 
  192 /*
  193  * How many physical pages per kmem arena virtual page.
  194  */
  195 #ifndef VM_KMEM_SIZE_SCALE
  196 #define VM_KMEM_SIZE_SCALE      (3)
  197 #endif
  198 
  199 /*
  200  * Optional floor (in bytes) on the size of the kmem arena.
  201  */
  202 #ifndef VM_KMEM_SIZE_MIN
  203 #define VM_KMEM_SIZE_MIN        (12 * 1024 * 1024)
  204 #endif
  205 
  206 /*
  207  * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
  208  * kernel map rounded to the nearest multiple of the superpage size.
  209  */
  210 #ifndef VM_KMEM_SIZE_MAX
  211 #define VM_KMEM_SIZE_MAX        (((((VM_MAX_KERNEL_ADDRESS - \
  212     VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
  213 #endif
  214 
  215 /* initial pagein size of beginning of executable file */
  216 #ifndef VM_INITIAL_PAGEIN
  217 #define VM_INITIAL_PAGEIN       16
  218 #endif
  219 
  220 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  221 
  222 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
  223 #define VM_MAX_AUTOTUNE_MAXUSERS 384
  224 #endif
  225 
  226 #define SFBUF
  227 #define SFBUF_MAP
  228 #define SFBUF_CPUSET
  229 #define SFBUF_PROCESS_PAGE
  230 
  231 #define PMAP_HAS_DMAP   0
  232 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
  233 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
  234 
  235 #endif /* _MACHINE_VMPARAM_H_ */

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