osfmk/i386/mtrr.h

   1 /*
   2  * Copyright (c) 2000-2003 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 #ifndef _I386_MTRR_H_
  24 #define _I386_MTRR_H_
  25
  26 /*
  27  * Memory type range register (MTRR) support.
  28  */
  29
  30 #include <mach/std_types.h>
  31 #include <sys/appleapiopts.h>
  32 #include <sys/cdefs.h>
  33
  34 #ifdef __APPLE_API_PRIVATE
  35
  36 enum {
  37         MTRR_TYPE_UNCACHEABLE  = 0,
  38         MTRR_TYPE_WRITECOMBINE = 1,
  39         MTRR_TYPE_WRITETHROUGH = 4,
  40         MTRR_TYPE_WRITEPROTECT = 5,
  41         MTRR_TYPE_WRITEBACK    = 6
  42 };
  43
  44 __BEGIN_DECLS
  45
  46 extern void          mtrr_init(void);
  47 extern kern_return_t mtrr_update_cpu(void);
  48 extern kern_return_t mtrr_update_all_cpus(void);
  49
  50 extern kern_return_t mtrr_range_add(    addr64_t phys_addr,
  51                                         uint64_t length,
  52                                         uint32_t mem_type);
  53
  54 extern kern_return_t mtrr_range_remove( addr64_t phys_addr,
  55                                         uint64_t length,
  56                                         uint32_t mem_type);
  57
  58 extern void          pat_init(void);
  59
  60 __END_DECLS
  61
  62 #endif /* __APPLE_API_PRIVATE */
  63
  64 #endif /* !_I386_MTRR_H_ */