xnu-792.25.20.tar.gz

[apple/xnu.git] / iokit / Kernel / IOCopyMapper.h

diff --git a/iokit/Kernel/IOCopyMapper.h b/iokit/Kernel/IOCopyMapper.h
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+/*
+ * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+// 45678901234567890123456789012345678901234567890123456789012345678901234567890
+
+#include <libkern/OSAtomic.h>
+
+#include <IOKit/IOLocks.h>
+#include <IOKit/IOPlatformExpert.h>
+#include <IOKit/IODeviceTreeSupport.h>
+#include <IOKit/IOMapper.h>
+
+// General constants about all VART/DART style Address Re-Mapping Tables
+#define kMapperPage        (4 * 1024)
+#define kTransPerPage      (kMapperPage / sizeof(ppnum_t))
+
+#define kMinZoneSize       4           // Minimum Zone size in pages
+#define kMaxNumZones       (31 - 14)   // 31 bit mapped in 16K super pages
+
+class IOCopyMapper : public IOMapper
+{
+    OSDeclareDefaultStructors(IOCopyMapper);
+
+// alias the fTable variable into our mappings table
+#define fMappings      ((ActiveDARTEntry *) super::fTable)
+
+private:
+
+    UInt32             fFreeLists[kMaxNumZones];
+
+    IOLock             *fTableLock;
+
+    void               *fDummyPage;
+
+    UInt32              fNumZones;
+    UInt32              fMapperRegionSize;
+    UInt32              fMapperRegionUsed;
+    UInt32              fMapperRegionMaxUsed;
+    UInt32              fFreeSleepers;
+    ppnum_t             fDummyPageNumber;
+    ppnum_t             fBufferPage;
+
+    // Internal functions
+
+    void breakUp(unsigned start, unsigned end, unsigned freeInd);
+    void invalidateDART(ppnum_t pnum, IOItemCount size);
+    void tlbInvalidate(ppnum_t pnum, IOItemCount size);
+
+    virtual void free();
+
+    virtual bool initHardware(IOService * provider);
+public:
+    virtual ppnum_t iovmAlloc(IOItemCount pages);
+    virtual void iovmFree(ppnum_t addr, IOItemCount pages);
+
+    virtual void iovmInsert(ppnum_t addr, IOItemCount offset, ppnum_t page);
+    virtual void iovmInsert(ppnum_t addr, IOItemCount offset,
+                            ppnum_t *pageList, IOItemCount pageCount);
+    virtual void iovmInsert(ppnum_t addr, IOItemCount offset,
+                            upl_page_info_t *pageList, IOItemCount pageCount);
+
+    virtual addr64_t mapAddr(IOPhysicalAddress addr);
+};
+
+extern IOCopyMapper * gIOCopyMapper;