1 /*- 2 * Copyright (c) 1991 Regents of the University of California. 3 * Copyright (c) 2003 Peter Wemm. 4 * Copyright (c) 2008 The DragonFly Project. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department and William Jolitz of UUNET Technologies Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * Derived from hp300 version by Mike Hibler, this version by William 36 * Jolitz uses a recursive map [a pde points to the page directory] to 37 * map the page tables using the pagetables themselves. This is done to 38 * reduce the impact on kernel virtual memory for lots of sparse address 39 * space, and to reduce the cost of memory to each process. 40 * 41 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 42 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 43 */ 44 45 #ifndef _CPU_PMAP_H_ 46 #define _CPU_PMAP_H_ 47 48 /* 49 * Page-directory and page-table entries follow this format, with a few 50 * of the fields not present here and there, depending on a lot of things. 51 */ 52 /* ---- Intel Nomenclature ---- */ 53 #define X86_PG_V 0x001 /* P Valid */ 54 #define X86_PG_RW 0x002 /* R/W Read/Write */ 55 #define X86_PG_U 0x004 /* U/S User/Supervisor */ 56 #define X86_PG_NC_PWT 0x008 /* PWT Write through */ 57 #define X86_PG_NC_PCD 0x010 /* PCD Cache disable */ 58 #define X86_PG_A 0x020 /* A Accessed */ 59 #define X86_PG_M 0x040 /* D Dirty */ 60 #define X86_PG_PS 0x080 /* PS Page size (0=4k,1=2M) */ 61 #define X86_PG_PTE_PAT 0x080 /* PAT PAT index */ 62 #define X86_PG_G 0x100 /* G Global */ 63 #define X86_PG_AVAIL1 0x200 /* / Available for system */ 64 #define X86_PG_AVAIL2 0x400 /* < programmers use */ 65 #define X86_PG_AVAIL3 0x800 /* \ */ 66 #define X86_PG_PDE_PAT 0x1000 /* PAT PAT index */ 67 #define X86_PG_NX (1ul<<63) /* No-execute */ 68 69 70 /* Our various interpretations of the above */ 71 //#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */ 72 //#define PG_MANAGED PG_AVAIL2 73 //#define PG_DEVICE PG_AVAIL3 74 #define PG_FRAME (0x000ffffffffff000ul) 75 #define PG_PS_FRAME (0x000fffffffe00000ul) 76 //#define PG_PROT (PG_RW|PG_U) /* all protection bits . */ 77 //#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */ 78 79 /* 80 * Promotion to a 2MB (PDE) page mapping requires that the corresponding 4KB 81 * (PTE) page mappings have identical settings for the following fields: 82 */ 83 /* 84 #define PG_PTE_PROMOTE (PG_NX | PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \ 85 PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V) 86 */ 87 /* 88 * Page Protection Exception bits 89 */ 90 91 #define PGEX_P 0x01 /* Protection violation vs. not present */ 92 #define PGEX_W 0x02 /* during a Write cycle */ 93 #define PGEX_U 0x04 /* access from User mode (UPL) */ 94 #define PGEX_RSV 0x08 /* reserved PTE field is non-zero */ 95 #define PGEX_I 0x10 /* during an instruction fetch */ 96 97 /* 98 * Virtual kernel bits, managed by software. Stored in tf_xflags. 99 * 100 * PGEX_FPFAULT - Force the FP unit to generate a T_DNA fault if an 101 * emulated user process tried to use it. This bit is 102 * only used by vmspace_ctl(). 103 */ 104 #define PGEX_FPFAULT 0x80 105 106 #endif /* !_CPU_PMAP_H_ */ 107