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      1 /*	$NetBSD: pte.h,v 1.7 2022/08/20 23:19:09 riastradh 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 #ifndef _MACHINE_PTE_H_X86
     36 #error Use machine/pte.h, not x86/pte.h directly.
     37 #endif
     38 
     39 /* Cacheability bits when we are using PAT */
     40 #define PGC_WB		0			/* The default */
     41 #define PGC_WC		PTE_PWT			/* WT and CD is WC */
     42 #define PGC_UCMINUS	PTE_PCD			/* UC but mtrr can override */
     43 #define PGC_UC		(PTE_PWT | PTE_PCD)	/* hard UC */
     44 
     45 /*
     46  * #PF exception bits
     47  */
     48 #define PGEX_P		0x0001	/* the page was present */
     49 #define PGEX_W		0x0002	/* exception during a write cycle */
     50 #define PGEX_U		0x0004	/* exception while in user mode */
     51 #define PGEX_RSVD	0x0008	/* a reserved bit was set in the page tables */
     52 #define PGEX_I		0x0010	/* exception during instruction fetch */
     53 #define PGEX_PK		0x0020	/* access disallowed by protection key */
     54 #define PGEX_SGX	0x8000	/* violation of sgx-specific access rights */
     55 
     56 /*
     57  * pl*_pi: index in the ptp page for a pde mapping a VA.
     58  * (pl*_i below is the index in the virtual array of all pdes per level)
     59  */
     60 #define pl1_pi(VA)	(((VA_SIGN_POS(VA)) & L1_MASK) >> L1_SHIFT)
     61 #define pl2_pi(VA)	(((VA_SIGN_POS(VA)) & L2_MASK) >> L2_SHIFT)
     62 #define pl3_pi(VA)	(((VA_SIGN_POS(VA)) & L3_MASK) >> L3_SHIFT)
     63 #define pl4_pi(VA)	(((VA_SIGN_POS(VA)) & L4_MASK) >> L4_SHIFT)
     64 #define pl_pi(va, lvl) \
     65         (((VA_SIGN_POS(va)) & ptp_masks[(lvl)-1]) >> ptp_shifts[(lvl)-1])
     66 
     67 /*
     68  * pl*_i: generate index into pde/pte arrays in virtual space
     69  */
     70 #define pl1_i(VA)	(((VA_SIGN_POS(VA)) & L1_FRAME) >> L1_SHIFT)
     71 #define pl2_i(VA)	(((VA_SIGN_POS(VA)) & L2_FRAME) >> L2_SHIFT)
     72 #define pl3_i(VA)	(((VA_SIGN_POS(VA)) & L3_FRAME) >> L3_SHIFT)
     73 #define pl4_i(VA)	(((VA_SIGN_POS(VA)) & L4_FRAME) >> L4_SHIFT)
     74 
     75 #endif /* _X86_PTE_H */
     76