sys/platform/pc64/include/vmparam.h

   1 /*-
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * Copyright (c) 1994 John S. Dyson
   4  * Copyright (c) 2003 Peter Wemm
   5  * Copyright (c) 2008 The DragonFly Project.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * William Jolitz.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
  40  * $FreeBSD: src/sys/amd64/include/vmparam.h,v 1.44 2003/12/07 04:51:04 alc Exp $
  41  * $DragonFly: src/sys/platform/pc64/include/vmparam.h,v 1.2 2008/08/29 17:07:17 dillon Exp $
  42  */
  43
  44
  45 #ifndef _MACHINE_VMPARAM_H_
  46 #define _MACHINE_VMPARAM_H_
  47
  48 /*
  49  * Machine dependent constants for x86_64.
  50  */
  51
  52 /*
  53  * Virtual memory related constants, all in bytes
  54  */
  55 #define MAXTSIZ         (256UL*1024*1024)       /* max text size */
  56 #ifndef DFLDSIZ
  57 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
  58 #endif
  59 #ifndef MAXDSIZ
  60 #define MAXDSIZ         (32768UL*1024*1024)     /* max data size */
  61 #endif
  62 #ifndef DFLSSIZ
  63 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
  64 #endif
  65 #ifndef MAXSSIZ
  66 #define MAXSSIZ         (512UL*1024*1024)       /* max stack size */
  67 #endif
  68 #ifndef SGROWSIZ
  69 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
  70 #endif
  71
  72 /*
  73  * The time for a process to be blocked before being very swappable.
  74  * This is a number of seconds which the system takes as being a non-trivial
  75  * amount of real time.  You probably shouldn't change this;
  76  * it is used in subtle ways (fractions and multiples of it are, that is, like
  77  * half of a ``long time'', almost a long time, etc.)
  78  * It is related to human patience and other factors which don't really
  79  * change over time.
  80  */
  81 #define MAXSLP          20
  82
  83 /*
  84  * We provide a machine specific single page allocator through the use
  85  * of the direct mapped segment.  This uses 2MB pages for reduced
  86  * TLB pressure.
  87  */
  88 #define UMA_MD_SMALL_ALLOC
  89
  90 /*
  91  * The number of PHYSSEG entries must be one greater than the number
  92  * of phys_avail entries because the phys_avail entry that spans the
  93  * largest physical address that is accessible by ISA DMA is split
  94  * into two PHYSSEG entries.
  95  */
  96 #define VM_PHYSSEG_MAX          127
  97
  98 /*
  99  * Virtual addresses of things.  Derived from the page directory and
 100  * page table indexes from pmap.h for precision.
 101  * Because of the page that is both a PD and PT, it looks a little
 102  * messy at times, but hey, we'll do anything to save a page :-)
 103  *
 104  * The kernel address space can be up to (I think) 511 page directory
 105  * pages.  Each one represents 1G.  NKPDPE defines the size of the kernel
 106  * address space.  The recommended value is between 128 and 511.
 107  *
 108  * The ending address is non-inclusive of the per-cpu data array
 109  * which starts at MPPTDI (-16MB mark).  MPPTDI is the page directory
 110  * index in the last PD of the kernel address space and is typically
 111  * set to (NPDEPG - 8) = (512 - 8).
 112  */
 113 #define NKPDPE                  511
 114 #define VM_MIN_KERNEL_ADDRESS   KVADDR(KPML4I, NPDPEPG - NKPDPE, 0, 0)
 115 #define VM_MAX_KERNEL_ADDRESS   KVADDR(KPML4I, NPDPEPG - 1, MPPTDI, NPTEPG - 1)
 116
 117 #define DMAP_MIN_ADDRESS        KVADDR(DMPML4I, 0, 0, 0)
 118 #define DMAP_MAX_ADDRESS        KVADDR(DMPML4I+NDMPML4E, 0, 0, 0)
 119
 120 #define KERNBASE                KVADDR(KPML4I, KPDPI, 0, 0)
 121 #define PTOV_OFFSET             KERNBASE
 122
 123 #define UPT_MAX_ADDRESS         KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
 124 #define UPT_MIN_ADDRESS         KVADDR(PML4PML4I, 0, 0, 0)
 125
 126 /*
 127  * Do not allow the top 2MB of the user stack to be mapped to work around
 128  * an AMD bug wherein the cpu can lockup or destabilize if the instruction
 129  * prefetcher crosses over into non-canonical address space.  Only the top
 130  * 4KB needs to be disallowed, but taking out the whole 2MB allows potential
 131  * 2MB PTE optimizations to be retained.
 132  */
 133 #define VM_MIN_USER_ADDRESS     ((vm_offset_t)0)
 134 #define VM_MAX_USER_ADDRESS     UVADDR(NUPDP_USER - 1, NPDPEPG - 1, \
 135                                         NPDEPG - 1, 0)
 136
 137 #define USRSTACK                VM_MAX_USER_ADDRESS
 138
 139 #define VM_MAX_ADDRESS          UPT_MAX_ADDRESS
 140 #define VM_MIN_ADDRESS          (0)
 141
 142 #define PHYS_TO_DMAP(x)         ((vm_offset_t)(x) | DMAP_MIN_ADDRESS)
 143 #define DMAP_TO_PHYS(x)         ((vm_paddr_t)(x) & ~DMAP_MIN_ADDRESS)
 144
 145 /* initial pagein size of beginning of executable file */
 146 #ifndef VM_INITIAL_PAGEIN
 147 #define VM_INITIAL_PAGEIN       16
 148 #endif
 149
 150 #endif /* _MACHINE_VMPARAM_H_ */