svga_limits.h revision 6df26cac 
1/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/vmware/svga_limits.h,v 1.1 2001/04/05 19:29:44 dawes Exp $ */
2/* **********************************************************
3 * Copyright (C) 1998-2001 VMware, Inc.
4 * All Rights Reserved
5 * $Id: svga_limits.h,v 1.1.1.1 2008/08/02 05:18:37 mrg Exp $
6 * **********************************************************/
7
8/*
9 * svga_limits.h --
10 *
11 * SVGA limits
12 */
13
14#ifndef _SVGA_LIMITS_H_
15#define _SVGA_LIMITS_H_
16
17#define INCLUDE_ALLOW_USERLEVEL
18#define INCLUDE_ALLOW_MONITOR
19#include "includeCheck.h"
20
21/*
22 * Location and size of SVGA frame buffer and the FIFO.
23 */
24#define SVGA_VRAM_SIZE         (16*1024*1024)
25#define SVGA_MEM_SIZE          (256*1024)
26
27/*
28 * SVGA_FB_START is the default starting address of the SVGA frame
29 * buffer in the guest's physical address space.
30 * SVGA_FB_START_BIGMEM is the starting address of the SVGA frame
31 * buffer for VMs that have a large amount of physical memory.
32 *
33 * The address of SVGA_FB_START is set to 2GB - (SVGA_FB_MAX_SIZE + SVGA_MEM_SIZE),
34 * thus the SVGA frame buffer sits at [SVGA_FB_START .. 2GB-1] in the
35 * physical address space.  Our older SVGA drivers for NT treat the
36 * address of the frame buffer as a signed integer.  For backwards
37 * compatibility, we keep the default location of the frame buffer
38 * at under 2GB in the address space.  This restricts VMs to have "only"
39 * up to ~2031MB (i.e., up to SVGA_FB_START) of physical memory.
40 *
41 * For VMs that want more memory than the ~2031MB, we place the SVGA
42 * frame buffer at SVGA_FB_START_BIGMEM.  This allows VMs to have up
43 * to 3584MB, at least as far as the SVGA frame buffer is concerned
44 * (note that there may be other issues that limit the VM memory
45 * size).  PCI devices use high memory addresses, so we have to put
46 * SVGA_FB_START_BIGMEM low enough so that it doesn't overlap with any
47 * of these devices.  Placing SVGA_FB_START_BIGMEM at 0xE0000000
48 * should leave plenty of room for the PCI devices.
49 *
50 * NOTE: All of that is only true for the 0710 chipset.  As of the 0405
51 * chipset, the framebuffer start is determined solely based on the value
52 * the guest BIOS or OS programs into the PCI base address registers.
53 */
54#define SVGA_FB_LEGACY_START		0x7EFC0000
55#define SVGA_FB_LEGACY_START_BIGMEM	0xE0000000
56
57#endif
58