1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4 * 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. 9 * 10 * %sccs.include.redist.c% 11 * 12 * from: Utah $Hdr: pte.h 1.11 89/09/03$ 13 * 14 * @(#)pte.h 7.3 (Berkeley) 05/08/91 15 */ 16 17 /* 18 * HP300 hardware segment/page table entries 19 */ 20 21 struct ste { 22 unsigned int sg_pfnum:20; /* page table frame number */ 23 unsigned int :8; /* reserved at 0 */ 24 unsigned int :1; /* reserved at 1 */ 25 unsigned int sg_prot:1; /* write protect bit */ 26 unsigned int sg_v:2; /* valid bits */ 27 }; 28 29 struct pte { 30 unsigned int pg_pfnum:20; /* page frame number or 0 */ 31 unsigned int :3; 32 unsigned int pg_w:1; /* is wired */ 33 unsigned int :1; /* reserved at zero */ 34 unsigned int pg_ci:1; /* cache inhibit bit */ 35 unsigned int :1; /* reserved at zero */ 36 unsigned int pg_m:1; /* hardware modified (dirty) bit */ 37 unsigned int pg_u:1; /* hardware used (reference) bit */ 38 unsigned int pg_prot:1; /* write protect bit */ 39 unsigned int pg_v:2; /* valid bit */ 40 }; 41 42 typedef struct ste st_entry_t; /* segment table entry */ 43 typedef struct pte pt_entry_t; /* Mach page table entry */ 44 45 #define PT_ENTRY_NULL ((pt_entry_t *) 0) 46 #define ST_ENTRY_NULL ((st_entry_t *) 0) 47 48 #define SG_V 0x00000002 /* segment is valid */ 49 #define SG_NV 0x00000000 50 #define SG_PROT 0x00000004 /* access protection mask */ 51 #define SG_RO 0x00000004 52 #define SG_RW 0x00000000 53 #define SG_FRAME 0xfffff000 54 #define SG_IMASK 0xffc00000 55 #define SG_PMASK 0x003ff000 56 #define SG_ISHIFT 22 57 #define SG_PSHIFT 12 58 59 #define PG_V 0x00000001 60 #define PG_NV 0x00000000 61 #define PG_PROT 0x00000004 62 #define PG_U 0x00000008 63 #define PG_M 0x00000010 64 #define PG_W 0x00000100 65 #define PG_RO 0x00000004 66 #define PG_RW 0x00000000 67 #define PG_FRAME 0xfffff000 68 #define PG_CI 0x00000040 69 #define PG_SHIFT 12 70 #define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT) 71 72 #define HP_STSIZE HP_PAGE_SIZE /* segment table size */ 73 #define HP_MAX_PTSIZE HP_SEG_SIZE /* max size of UPT */ 74 #define HP_MAX_KPTSIZE 0x100000 /* max memory to allocate to KPT */ 75 #define HP_PTBASE 0x10000000 /* UPT map base address */ 76 #define HP_PTMAXSIZE 0x70000000 /* UPT map maximum size */ 77 78 /* 79 * Kernel virtual address to page table entry and to physical address. 80 */ 81 #define kvtopte(va) \ 82 (&Sysmap[((unsigned)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT]) 83 #define ptetokv(pt) \ 84 ((((pt_entry_t *)(pt) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS) 85 #define kvtophys(va) \ 86 ((kvtopte(va)->pg_pfnum << PGSHIFT) | ((int)(va) & PGOFSET)) 87 88