1 files changed, 55 insertions, 0 deletions
diff --git a/src/svga_limits.h b/src/svga_limits.h
new file mode 100644
index 0000000..3b35ccc
--- /dev/null
+++ b/src/svga_limits.h
@@ -0,0 +1,55 @@
+/* **********************************************************
+ * Copyright (C) 1998-2001 VMware, Inc.
+ * All Rights Reserved
+ * **********************************************************/
+
+/*
+ * 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