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: head/sys/i386/include/vmparam.h 343567 2019-01-30 02:07:13Z kib $
   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 up to three free page lists: VM_FREELIST_DMA32 is for physical pages
   99  * that have physical addresses below 4G but are not accessible by ISA DMA,
  100  * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
  101  * DMA.
  102  */
  103 #define VM_NFREELIST            3
  104 #define VM_FREELIST_DEFAULT     0
  105 #define VM_FREELIST_DMA32       1
  106 #define VM_FREELIST_LOWMEM      2
  107 
  108 #define VM_LOWMEM_BOUNDARY      (16 << 20)      /* 16MB ISA DMA limit */
  109 
  110 /*
  111  * Always create DMA32 freelist if there is any memory above 4G.
  112  * Bounce dma is extremely fragile and simultaneously intensively
  113  * used.
  114  */
  115 #define VM_DMA32_NPAGES_THRESHOLD       1
  116 
  117 /*
  118  * The largest allocation size is 2MB under PAE and 4MB otherwise.
  119  */
  120 #define VM_NFREEORDER_PAE               10
  121 #define VM_NFREEORDER_NOPAE             11
  122 #define VM_NFREEORDER_MAX               VM_NFREEORDER_NOPAE
  123 #define VM_NFREEORDER                   i386_pmap_VM_NFREEORDER
  124 
  125 /*
  126  * Enable superpage reservations: 1 level.
  127  */
  128 #ifndef VM_NRESERVLEVEL
  129 #define VM_NRESERVLEVEL         1
  130 #endif
  131 
  132 /*
  133  * Level 0 reservations consist of 512 pages when PAE pagetables are
  134  * used, and 1024 pages otherwise.
  135  */
  136 #ifndef VM_LEVEL_0_ORDER
  137 #define VM_LEVEL_0_ORDER_PAE    9
  138 #define VM_LEVEL_0_ORDER_NOPAE  10
  139 #define VM_LEVEL_0_ORDER_MAX    VM_LEVEL_0_ORDER_NOPAE
  140 #define VM_LEVEL_0_ORDER        i386_pmap_VM_LEVEL_0_ORDER
  141 #else
  142 #define VM_LEVEL_0_ORDER_MAX    VM_LEVEL_0_ORDER
  143 #endif
  144 
  145 /*
  146  * Kernel physical load address.
  147  */
  148 #ifndef KERNLOAD
  149 #define KERNLOAD                (8 * 1024 * 1024)
  150 #endif /* !defined(KERNLOAD) */
  151 
  152 /*
  153  * Virtual addresses of things.  Derived from the page directory and
  154  * page table indexes from pmap.h for precision.
  155  * Because of the page that is both a PD and PT, it looks a little
  156  * messy at times, but hey, we'll do anything to save a page :-)
  157  */
  158 
  159 #define VM_MAX_KERNEL_ADDRESS   (0xffffffffU - 16 * 1024 * 1024 + 1)
  160 
  161 #define VM_MIN_KERNEL_ADDRESS   0
  162 
  163 #define KERNBASE                KERNLOAD
  164 
  165 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  166 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  167 
  168 #define VM_MAXUSER_ADDRESS      (0xffffffff - 4 * 1024 * 1024 + 1)
  169 
  170 #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  171 #define USRSTACK                SHAREDPAGE
  172 
  173 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, 0)
  174 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  175 
  176 #define PMAP_TRM_MIN_ADDRESS    VM_MAXUSER_ADDRESS
  177 #define PMAP_TRM_MAX_ADDRESS    0xffffffff
  178 
  179 #define PMAP_MAP_LOW            (4 * 1024 * 1024)
  180 
  181 /*
  182  * KVA layout.  The unit of the system allocation is single PDE, which
  183  * represents NBPDR bytes, aligned to NBPDR.  NBPDR is 4M for non-PAE
  184  * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs
  185  * to create the same memory map as non-PAE.
  186  *
  187  * 0x00000000 - 0x003fffff      Transient identity map of low memory (0-4M),
  188  *                              normally disabled to catch NULL derefs.
  189  * 0x00400000 - 0x007fffff      Fixed mapping of the low memory (4-8M).
  190  * 0x00800000 - 0xffbfffff      KERNBASE (VA) == KERNLOAD (PA), kernel
  191  *                              text + data and all kernel maps.  Managed
  192  *                              by MI VM.
  193  * 0xffc00000 - 0xffdfffff      Recursive kernel page table mapping, pointed
  194  *                              to by PTmap.  PTD[] recursively points
  195  *                              into PTmap.
  196  * 0xffe00000 - 0xffffffff      Kernel/User mode shared PDE, contains GDT,
  197  *                              IDT, TSS, LDT, trampoline code and stacks.
  198  *                              Managed by pmap_trm_alloc().
  199  */
  200 
  201 /*
  202  * How many physical pages per kmem arena virtual page.
  203  */
  204 #ifndef VM_KMEM_SIZE_SCALE
  205 #define VM_KMEM_SIZE_SCALE      (1)
  206 #endif
  207 
  208 /*
  209  * Optional floor (in bytes) on the size of the kmem arena.
  210  */
  211 #ifndef VM_KMEM_SIZE_MIN
  212 #define VM_KMEM_SIZE_MIN        (12 * 1024 * 1024)
  213 #endif
  214 
  215 /*
  216  * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
  217  * kernel map rounded to the nearest multiple of the superpage size.
  218  */
  219 #ifndef VM_KMEM_SIZE_MAX
  220 #define VM_KMEM_SIZE_MAX        (((((VM_MAX_KERNEL_ADDRESS - \
  221     VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
  222 #endif
  223 
  224 /* initial pagein size of beginning of executable file */
  225 #ifndef VM_INITIAL_PAGEIN
  226 #define VM_INITIAL_PAGEIN       16
  227 #endif
  228 
  229 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  230 
  231 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
  232 #define VM_MAX_AUTOTUNE_MAXUSERS 384
  233 #endif
  234 
  235 #define SFBUF
  236 #define SFBUF_MAP
  237 #define SFBUF_CPUSET
  238 #define SFBUF_PROCESS_PAGE
  239 
  240 #define PMAP_HAS_DMAP   0
  241 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
  242 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
  243 
  244 #endif /* _MACHINE_VMPARAM_H_ */

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