iokit/Drivers/platform/drvAppleNVRAM/AppleNVRAM.h

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #include <IOKit/nvram/IONVRAMController.h>
  24
  25 enum {
  26   kNVRAMTypeNone = 0,
  27   kNVRAMTypeIOMem,
  28   kNVRAMTypePort,
  29
  30   kNVRAMImageSize = 0x2000
  31 };
  32
  33 class AppleNVRAM : public IONVRAMController
  34 {
  35   OSDeclareDefaultStructors(AppleNVRAM);
  36
  37 private:
  38   UInt32         _nvramType;
  39   volatile UInt8 *_nvramData;
  40   volatile UInt8 *_nvramPort;
  41
  42 public:
  43   bool start(IOService *provider);
  44
  45   virtual IOReturn read(IOByteCount offset, UInt8 *buffer,
  46                         IOByteCount length);
  47   virtual IOReturn write(IOByteCount offset, UInt8 *buffer,
  48                          IOByteCount length);
  49 };