sys/arch/sun2/include/vmparam.h

   1 /*      $NetBSD: vmparam.h,v 1.12 2008/04/28 20:23:37 martin Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * Machine dependent constants for Sun2
  31  *
  32  * The Sun2 has limited total kernel virtual space (14MB) and
  33  * can not use main memory for page tables.  (All active PTEs
  34  * must be installed in special translation RAM in the MMU).
  35  * Therefore, parameters that would normally configure the
  36  * size of various page tables are irrelevant.  Only things
  37  * that consume portions of kernel virtual (KV) space matter,
  38  * and those things should be chosen to conserve KV space.
  39  */
  40
  41 /*
  42  * The Sun2 has 2K pages.  Override PAGE_* to be compile-time constants.
  43  */
  44 #define PAGE_SHIFT      11
  45 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  46 #define PAGE_MASK       (PAGE_SIZE - 1)
  47
  48 /*
  49  * We definitely need a small pager map.
  50  */
  51 #define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024)
  52
  53 /*
  54  * USRSTACK is the top (end) of the user stack.
  55  */
  56 #define USRSTACK        0x1000000       /* High end of user stack */
  57
  58 /*
  59  * Virtual memory related constants, all in bytes.
  60  * The Sun2 has only 16 MB of user-virtual space,
  61  * so we need to be conservative with these limits.
  62  */
  63 #ifndef MAXTSIZ
  64 #define MAXTSIZ         (5*1024*1024)           /* max text size */
  65 #endif
  66 #ifndef DFLDSIZ
  67 #define DFLDSIZ         (4*1024*1024)           /* initial data size limit */
  68 #endif
  69 #ifndef MAXDSIZ
  70 #define MAXDSIZ         (6*1024*1024)           /* max data size */
  71 #endif
  72 #ifndef DFLSSIZ
  73 #define DFLSSIZ         (512*1024)              /* initial stack size limit */
  74 #endif
  75 #ifndef MAXSSIZ
  76 #define MAXSSIZ         (4*1024*1024)           /* max stack size */
  77 #endif
  78
  79 /*
  80  * PTEs for mapping user space into the kernel for phyio operations.
  81  * The actual limitation for physio requests will be the DVMA space,
  82  * and that is fixed by hardware design at 256K.  We could make the
  83  * physio map larger than that, but it would not buy us much.
  84  */
  85 #ifndef USRIOSIZE
  86 #define USRIOSIZE       128             /* 256K */
  87 #endif
  88
  89 /*
  90  * Mach-derived constants:
  91  */
  92
  93 /* user/kernel map constants */
  94 #define VM_MIN_ADDRESS          ((vaddr_t)0)
  95 #define VM_MAX_ADDRESS          ((vaddr_t)USRSTACK)
  96 #define VM_MAXUSER_ADDRESS      ((vaddr_t)USRSTACK)
  97 #define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)KERNBASE)
  98 #define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)KERN_END)
  99
 100 /* virtual sizes (bytes) for various kernel submaps */
 101 #define VM_PHYS_SIZE            (USRIOSIZE*PAGE_SIZE)
 102
 103 #define VM_PHYSSEG_STRAT        VM_PSTRAT_BSEARCH
 104 #define VM_PHYSSEG_NOADD        /* can't add RAM after vm_mem_init */
 105
 106 #define VM_NFREELIST            1
 107 #define VM_FREELIST_DEFAULT     0
 108
 109 #ifdef  _LKM
 110 #undef  KERNBASE
 111 extern  char KERNBASE[];
 112 #endif  /* _LKM */
 113
 114 /* This is needed by some LKMs. */
 115 #define VM_PHYSSEG_MAX          4