Some work in progress:

* set_gtt_entry() used the wrong index to fill the GTT - this could have never
  worked correctly when you specified more memory than the amount of stolen
  memory.
* Implementing maintaining resources for emulating overlay using the 3D engine
  on i965. I don't yet commit the actual overlay code, as that is a) ugly, and
  b) does not work yet.
* Moved AreaKeeper into its own header.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23709 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/graphics/intel_extreme/AreaKeeper.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2006-2008, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Axel Dörfler, [email protected]
+ */
+#ifndef AREA_KEEPER_H
+#define AREA_KEEPER_H
+
+
+#include <KernelExport.h>
+#include <OS.h>
+
+
+class AreaKeeper {
+	public:
+		AreaKeeper();
+		~AreaKeeper();
+
+		area_id Create(const char *name, void **_virtualAddress, uint32 spec,
+			size_t size, uint32 lock, uint32 protection);
+		area_id Map(const char *name, void *physicalAddress, size_t numBytes,
+			uint32 spec, uint32 protection, void **_virtualAddress);
+
+		status_t InitCheck() { return fArea < B_OK ? (status_t)fArea : B_OK; }
+		void Detach();
+
+	private:
+		area_id	fArea;
+};
+
+
+AreaKeeper::AreaKeeper()
+	:
+	fArea(-1)
+{
+}
+
+
+AreaKeeper::~AreaKeeper()
+{
+	if (fArea >= B_OK)
+		delete_area(fArea);
+}
+
+
+area_id
+AreaKeeper::Create(const char *name, void **_virtualAddress, uint32 spec,
+	size_t size, uint32 lock, uint32 protection)
+{
+	fArea = create_area(name, _virtualAddress, spec, size, lock, protection);
+	return fArea;
+}
+
+
+area_id
+AreaKeeper::Map(const char *name, void *physicalAddress, size_t numBytes,
+	uint32 spec, uint32 protection, void **_virtualAddress)
+{
+	fArea = map_physical_memory(name, physicalAddress, numBytes, spec, protection,
+		_virtualAddress);
+	return fArea;
+}
+
+
+void
+AreaKeeper::Detach()
+{
+	fArea = -1;
+}
+
+#endif	// AREA_KEEPER_H

headers/private/graphics/intel_extreme/intel_extreme.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2007, Haiku, Inc. All Rights Reserved.
+ * Copyright 2006-2008, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -179,6 +179,7 @@ struct intel_free_graphics_memory {
 #define G33_GTT_2M						(2 << 8)
 #define GTT_ENTRY_VALID					0x01
 #define GTT_ENTRY_LOCAL_MEMORY			0x02
+#define GTT_PAGE_SHIFT					12
 
 // interrupts
 #define INTEL_INTERRUPT_ENABLED			0x020a0