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pte.h revision 1.1 
      1 /*	$NetBSD: pte.h,v 1.1 2010/07/06 20:50:35 cegger Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christoph Egger.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _X86_PTE_H
     33 #define _X86_PTE_H
     34 
     35 /* Cacheability bits when we are using PAT */
     36 #define PGC_WB          0               /* The default */
     37 #define PGC_WC          PG_WT           /* WT and CD is WC */
     38 #define PGC_UCMINUS     PG_N            /* UC but mtrr can override */
     39 #define PGC_UC          (PG_WT | PG_N)  /* hard UC */
     40 
     41 /*
     42  * page protection exception bits
     43  */
     44 
     45 #define PGEX_P		0x01	/* protection violation (vs. no mapping) */
     46 #define PGEX_W		0x02	/* exception during a write cycle */
     47 #define PGEX_U		0x04	/* exception while in user mode (upl) */
     48 #define PGEX_X		0x10	/* exception during instruction fetch */
     49 
     50 #endif /* _X86_PTE_H */
     51