workbench/hidds/vmwaresvga/svga_limits.h

   1 /* **********************************************************
   2  * Copyright (C) 1998-2001 VMware, Inc.
   3  * All Rights Reserved
   4  * Id: svga_limits.h,v 1.8 2001/01/26 23:32:15 yoel Exp $
   5  * **********************************************************/
   6
   7 /*
   8  * svga_reg.h --
   9  *
  10  * SVGA limits
  11  */
  12
  13 #ifndef _SVGA_LIMITS_H_
  14 #define _SVGA_LIMITS_H_
  15
  16 #define INCLUDE_ALLOW_USERLEVEL
  17 #define INCLUDE_ALLOW_MONITOR
  18 //#include "includeCheck.h"
  19
  20 /*
  21  * Location and size of SVGA frame buffer.
  22  */
  23 #define SVGA_FB_MAX_SIZE       (16*1024*1024)
  24 #define SVGA_MEM_SIZE          (256*1024)
  25
  26 /*
  27  * SVGA_FB_START is the default starting address of the SVGA frame
  28  * buffer in the guest's physical address space.
  29  * SVGA_FB_START_BIGMEM is the starting address of the SVGA frame
  30  * buffer for VMs that have a large amount of physical memory.
  31  *
  32  * The address of SVGA_FB_START is set to 2GB - (SVGA_FB_MAX_SIZE + SVGA_MEM_SIZE),
  33  * thus the SVGA frame buffer sits at [SVGA_FB_START .. 2GB-1] in the
  34  * physical address space.  Our older SVGA drivers for NT treat the
  35  * address of the frame buffer as a signed integer.  For backwards
  36  * compatibility, we keep the default location of the frame buffer
  37  * at under 2GB in the address space.  This restricts VMs to have "only"
  38  * up to ~2031MB (i.e., up to SVGA_FB_START) of physical memory.
  39  *
  40  * For VMs that want more memory than the ~2031MB, we place the SVGA
  41  * frame buffer at SVGA_FB_START_BIGMEM.  This allows VMs to have up
  42  * to 3584MB, at least as far as the SVGA frame buffer is concerned
  43  * (note that there may be other issues that limit the VM memory
  44  * size).  PCI devices use high memory addresses, so we have to put
  45  * SVGA_FB_START_BIGMEM low enough so that it doesn't overlap with any
  46  * of these devices.  Placing SVGA_FB_START_BIGMEM at 0xE0000000
  47  * should leave plenty of room for the PCI devices.
  48  *
  49  * NOTE: All of that is only true for the 0710 chipset.  As of the 0405
  50  * chipset, the framebuffer start is determined solely based on the value
  51  * the guest BIOS or OS programs into the PCI base address registers.
  52  */
  53 #define SVGA_FB_LEGACY_START            0x7EFC0000
  54 #define SVGA_FB_LEGACY_START_BIGMEM     0xE0000000
  55
  56 #endif