projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| dea92547 KM |
1 | /* |
| 2 | * Copyright (c) 1988 University of Utah. | |
| 3 | * Copyright (c) 1992 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 and Ralph Campbell. | |
| 9 | * | |
| 10 | * %sccs.include.redist.c% | |
| 11 | * | |
| 12 | * from: Utah $Hdr: pte.h 1.11 89/09/03$ | |
| 13 | * | |
| c68d593d | 14 | * @(#)pte.h 7.2 (Berkeley) %G% |
| dea92547 KM |
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 { | |
| 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 | /* | |
| c68d593d | 69 | * Kernel virtual address to page table entry and visa versa. |
| dea92547 KM |
70 | */ |
| 71 | #define kvtopte(va) \ | |
| 72 | ((pt_entry_t *)PMAP_HASH_KADDR + \ | |
| 73 | (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT)) | |
| 74 | #define ptetokv(pte) \ | |
| 75 | ((((pt_entry_t *)(pte) - PMAP_HASH_KADDR) << PGSHIFT) + \ | |
| 76 | VM_MIN_KERNEL_ADDRESS) |