xnu-201.tar.gz

[apple/xnu.git] / iokit / Drivers / platform / drvAppleNVRAM / AppleNVRAM.h

/*
 * Copyright (c) 1998-2000 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@
 */

#include <IOKit/nvram/IONVRAMController.h>

enum {
  kNVRAMTypeNone = 0,
  kNVRAMTypeIOMem,
  kNVRAMTypePort,
  
  kNVRAMImageSize = 0x2000
};

class AppleNVRAM : public IONVRAMController
{
  OSDeclareDefaultStructors(AppleNVRAM);
  
private:
  UInt32         _nvramType;
  volatile UInt8 *_nvramData;
  volatile UInt8 *_nvramPort;
  
public:
  bool start(IOService *provider);
  
  virtual IOReturn read(IOByteCount offset, UInt8 *buffer,
			IOByteCount length);
  virtual IOReturn write(IOByteCount offset, UInt8 *buffer,
			 IOByteCount length);
};