1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department and Ralph Campbell. 9 * 10 * %sccs.include.redist.c% 11 * 12 * from: Utah $Hdr: pte.h 1.11 89/09/03$ 13 * 14 * @(#)pte.h 8.1 (Berkeley) 06/10/93 15 */ 16 17 /* 18 * R2000 hardware page table entry 19 */ 20 21 #ifndef LOCORE 22 struct pte { 23 #if BYTE_ORDER == BIG_ENDIAN 24 unsigned int pg_pfnum:20, /* HW: core page frame number or 0 */ 25 pg_n:1, /* HW: non-cacheable bit */ 26 pg_m:1, /* HW: modified (dirty) bit */ 27 pg_v:1, /* HW: valid bit */ 28 pg_g:1, /* HW: ignore pid bit */ 29 :4, 30 pg_swapm:1, /* SW: page must be forced to swap */ 31 pg_fod:1, /* SW: is fill on demand (=0) */ 32 pg_prot:2; /* SW: access control */ 33 #endif 34 #if BYTE_ORDER == LITTLE_ENDIAN 35 unsigned int pg_prot:2, /* SW: access control */ 36 pg_fod:1, /* SW: is fill on demand (=0) */ 37 pg_swapm:1, /* SW: page must be forced to swap */ 38 :4, 39 pg_g:1, /* HW: ignore pid bit */ 40 pg_v:1, /* HW: valid bit */ 41 pg_m:1, /* HW: modified (dirty) bit */ 42 pg_n:1, /* HW: non-cacheable bit */ 43 pg_pfnum:20; /* HW: core page frame number or 0 */ 44 #endif 45 }; 46 47 typedef union pt_entry { 48 unsigned int pt_entry; /* for copying, etc. */ 49 struct pte pt_pte; /* for getting to bits by name */ 50 } pt_entry_t; /* Mach page table entry */ 51 #endif /* LOCORE */ 52 53 #define PT_ENTRY_NULL ((pt_entry_t *) 0) 54 55 #define PG_PROT 0x00000003 56 #define PG_RW 0x00000000 57 #define PG_RO 0x00000001 58 #define PG_WIRED 0x00000002 59 #define PG_G 0x00000100 60 #define PG_V 0x00000200 61 #define PG_NV 0x00000000 62 #define PG_M 0x00000400 63 #define PG_N 0x00000800 64 #define PG_FRAME 0xfffff000 65 #define PG_SHIFT 12 66 #define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT) 67 68 #if defined(KERNEL) && !defined(LOCORE) 69 /* 70 * Kernel virtual address to page table entry and visa versa. 71 */ 72 #define kvtopte(va) \ 73 (Sysmap + (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT)) 74 #define ptetokv(pte) \ 75 ((((pt_entry_t *)(pte) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS) 76 77 extern pt_entry_t *Sysmap; /* kernel pte table */ 78 extern u_int Sysmapsize; /* number of pte's in Sysmap */ 79 #endif 80