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/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/vmware/svga_limits.h,v 1.2 2002/10/16 22:12:53 alanh Exp $ */
/* **********************************************************
* Copyright (C) 1998-2001 VMware, Inc.
* All Rights Reserved
* $Id$
* **********************************************************/
/*
* svga_limits.h --
*
* SVGA limits
*/
#ifndef _SVGA_LIMITS_H_
#define _SVGA_LIMITS_H_
#define INCLUDE_ALLOW_USERLEVEL
#define INCLUDE_ALLOW_MONITOR
#include "includeCheck.h"
/*
* Location and size of SVGA frame buffer and the FIFO.
*/
#define SVGA_VRAM_SIZE (16*1024*1024)
#define SVGA_MEM_SIZE (256*1024)
/*
* SVGA_FB_START is the default starting address of the SVGA frame
* buffer in the guest's physical address space.
* SVGA_FB_START_BIGMEM is the starting address of the SVGA frame
* buffer for VMs that have a large amount of physical memory.
*
* The address of SVGA_FB_START is set to 2GB - (SVGA_FB_MAX_SIZE + SVGA_MEM_SIZE),
* thus the SVGA frame buffer sits at [SVGA_FB_START .. 2GB-1] in the
* physical address space. Our older SVGA drivers for NT treat the
* address of the frame buffer as a signed integer. For backwards
* compatibility, we keep the default location of the frame buffer
* at under 2GB in the address space. This restricts VMs to have "only"
* up to ~2031MB (i.e., up to SVGA_FB_START) of physical memory.
*
* For VMs that want more memory than the ~2031MB, we place the SVGA
* frame buffer at SVGA_FB_START_BIGMEM. This allows VMs to have up
* to 3584MB, at least as far as the SVGA frame buffer is concerned
* (note that there may be other issues that limit the VM memory
* size). PCI devices use high memory addresses, so we have to put
* SVGA_FB_START_BIGMEM low enough so that it doesn't overlap with any
* of these devices. Placing SVGA_FB_START_BIGMEM at 0xE0000000
* should leave plenty of room for the PCI devices.
*
* NOTE: All of that is only true for the 0710 chipset. As of the 0405
* chipset, the framebuffer start is determined solely based on the value
* the guest BIOS or OS programs into the PCI base address registers.
*/
#define SVGA_FB_LEGACY_START 0x7EFC0000
#define SVGA_FB_LEGACY_START_BIGMEM 0xE0000000
#endif
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