1 /* $NetBSD: mips1_pte.h,v 1.4 1994/10/26 21:09:55 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department and Ralph Campbell. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah Hdr: pte.h 1.11 89/09/03 41 * 42 * @(#)pte.h 8.1 (Berkeley) 6/10/93 43 */ 44 45 /* 46 * R2000 hardware page table entry 47 */ 48 49 #ifndef LOCORE 50 struct pte { 51 #if BYTE_ORDER == BIG_ENDIAN 52 unsigned int pg_pfnum:20, /* HW: core page frame number or 0 */ 53 pg_n:1, /* HW: non-cacheable bit */ 54 pg_m:1, /* HW: modified (dirty) bit */ 55 pg_v:1, /* HW: valid bit */ 56 pg_g:1, /* HW: ignore pid bit */ 57 :4, 58 pg_swapm:1, /* SW: page must be forced to swap */ 59 pg_fod:1, /* SW: is fill on demand (=0) */ 60 pg_prot:2; /* SW: access control */ 61 #endif 62 #if BYTE_ORDER == LITTLE_ENDIAN 63 unsigned int pg_prot:2, /* SW: access control */ 64 pg_fod:1, /* SW: is fill on demand (=0) */ 65 pg_swapm:1, /* SW: page must be forced to swap */ 66 :4, 67 pg_g:1, /* HW: ignore pid bit */ 68 pg_v:1, /* HW: valid bit */ 69 pg_m:1, /* HW: modified (dirty) bit */ 70 pg_n:1, /* HW: non-cacheable bit */ 71 pg_pfnum:20; /* HW: core page frame number or 0 */ 72 #endif 73 }; 74 75 typedef union pt_entry { 76 unsigned int pt_entry; /* for copying, etc. */ 77 struct pte pt_pte; /* for getting to bits by name */ 78 } pt_entry_t; /* Mach page table entry */ 79 #endif /* LOCORE */ 80 81 #define PT_ENTRY_NULL ((pt_entry_t *) 0) 82 83 #define PG_PROT 0x00000003 84 #define PG_RW 0x00000000 85 #define PG_RO 0x00000001 86 #define PG_WIRED 0x00000002 87 #define PG_G 0x00000100 88 #define PG_V 0x00000200 89 #define PG_NV 0x00000000 90 #define PG_M 0x00000400 91 #define PG_N 0x00000800 92 #define PG_FRAME 0xfffff000 93 #define PG_SHIFT 12 94 #define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT) 95 96 #if defined(KERNEL) && !defined(LOCORE) 97 /* 98 * Kernel virtual address to page table entry and visa versa. 99 */ 100 #define kvtopte(va) \ 101 (Sysmap + (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT)) 102 #define ptetokv(pte) \ 103 ((((pt_entry_t *)(pte) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS) 104 105 extern pt_entry_t *Sysmap; /* kernel pte table */ 106 extern u_int Sysmapsize; /* number of pte's in Sysmap */ 107 #endif 108