sys/platform/vkernel64/include/vmparam.h

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/platform/vkernel/include/vmparam.h,v 1.5 2007/01/14 00:01:07 dillon Exp $
  35  */
  36
  37 #ifndef _MACHINE_VMPARAM_H_
  38 #define _MACHINE_VMPARAM_H_
  39
  40 /*
  41  * Indicate that read access also means execution access (XXX newer PCs
  42  * have a separate bit).
  43  */
  44 #define VM_PROT_READ_IS_EXEC
  45
  46 /*
  47  * Virtual memory related constants, all in bytes
  48  */
  49 #define MAXTSIZ         (256UL*1024*1024)       /* max text size */
  50 #ifndef DFLDSIZ
  51 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
  52 #endif
  53 #ifndef MAXDSIZ
  54 #define MAXDSIZ         (32768UL*1024*1024)     /* max data size */
  55 #endif
  56 #ifndef DFLSSIZ
  57 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
  58 #endif
  59 #ifndef MAXSSIZ
  60 #define MAXSSIZ         (512UL*1024*1024)       /* max stack size */
  61 #endif
  62 #ifndef SGROWSIZ
  63 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
  64 #endif
  65
  66 /*
  67  * After this period of time allow a process to become swappable.  This
  68  * parameter is mostly obsolete now.
  69  */
  70 #define MAXSLP          20
  71
  72 /*
  73  * For virtual kernels running as userland processes the user and kernel
  74  * address spaces exist in different VM spaces and can overlap.
  75  */
  76 #define KERNEL_KVA_START        (512ULL << 30)  /* From 512GB */
  77 #define KERNEL_KVA_SIZE         (512UL * 1024 * 1024 * 1024)
  78 #define KERNEL_STACK_SIZE       (512 * PAGE_SIZE)
  79
  80 #define VKERNEL_USEABLE_PHYS_RAM_BASE (128ULL << 30) /* from 32GB */
  81
  82 /*
  83  * Do not allow the top 2MB of the user stack to be mapped to work around
  84  * an AMD bug wherein the cpu can lockup or destabilize if the instruction
  85  * prefetcher crosses over into non-canonical address space.  Only the top
  86  * 4KB needs to be disallowed, but taking out the whole 2MB allows potential
  87  * 2MB PTE optimizations to be retained.
  88  */
  89 #define VM_MIN_USER_ADDRESS     ((vm_offset_t)0)
  90 #define VM_MAX_USER_ADDRESS     UVADDR(NUPML4E - 1, NPDPEPG - 1, NPDEPG - 1, 0)
  91
  92 #define DMAP_SIZE               (512UL * 1024 * 1024 * 1024)
  93
  94 #define KERNBASE                0xC0000000      /* XXX totally wrong */
  95
  96 #define USRSTACK                VM_MAX_USER_ADDRESS
  97
  98 extern void *dmap_min_address;
  99 #define PHYS_TO_DMAP(x)         ((uint64_t)(x) + (uint64_t)dmap_min_address)
 100 #define DMAP_TO_PHYS(x)         ((uint64_t)(x) - (uint64_t)dmap_min_address)
 101
 102 /*
 103  * Initial memory map preload
 104  */
 105 #ifndef VM_INITIAL_PAGEIN
 106 #define VM_INITIAL_PAGEIN       16
 107 #endif
 108
 109 #endif /* _MACHINE_VMPARAM_H_ */