xnu-1504.9.17.tar.gz

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

/*
 * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The 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,
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#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);
};