1*2174Swnj /* pte.h 4.2 01/15/81 */ 269Sbill 369Sbill /* 469Sbill * VAX page table entry 569Sbill * 669Sbill * There are two major kinds of pte's: those which have ever existed (and are 769Sbill * thus either now in core or on the swap device), and those which have 869Sbill * never existed, but which will be filled on demand at first reference. 969Sbill * There is a structure describing each. There is also an ancillary 1069Sbill * structure used in page clustering. 1169Sbill */ 1269Sbill 1369Sbill struct pte 1469Sbill { 1569Sbill unsigned int pg_pfnum:21, /* core page frame number or 0 */ 1669Sbill :2, 1769Sbill pg_vreadm:1, /* modified since vread (or with _m) */ 1869Sbill pg_swapm:1, /* have to write back to swap */ 1969Sbill pg_fod:1, /* is fill on demand (=0) */ 2069Sbill pg_m:1, /* hardware maintained modified bit */ 2169Sbill pg_prot:4, /* access control */ 2269Sbill pg_v:1; /* valid bit */ 2369Sbill }; 2469Sbill struct hpte 2569Sbill { 2669Sbill unsigned int pg_pfnum:21, 2769Sbill :2, 2869Sbill pg_high:9; /* special for clustering */ 2969Sbill }; 3069Sbill struct fpte 3169Sbill { 3269Sbill unsigned int pg_blkno:20, /* file system block number */ 3369Sbill pg_fileno:5, /* file mapped from or TEXT or ZERO */ 3469Sbill pg_fod:1, /* is fill on demand (=1) */ 3569Sbill :1, 3669Sbill pg_prot:4, 3769Sbill pg_v:1; 3869Sbill }; 3969Sbill 4069Sbill #define PG_V 0x80000000 4169Sbill #define PG_PROT 0x78000000 4269Sbill #define PG_M 0x04000000 4369Sbill #define PG_VREADM 0x00800000 4469Sbill #define PG_PFNUM 0x001fffff 4569Sbill 4669Sbill #define PG_FZERO (NOFILE) 4769Sbill #define PG_FTEXT (NOFILE+1) 4869Sbill #define PG_FMAX (PG_FTEXT) 4969Sbill 5069Sbill #define PG_NOACC 0 5169Sbill #define PG_KW 0x10000000 5269Sbill #define PG_KR 0x18000000 5369Sbill #define PG_UW 0x20000000 5469Sbill #define PG_URKW 0x70000000 5569Sbill #define PG_URKR 0x78000000 5669Sbill 5769Sbill /* 5869Sbill * Pte related macros 5969Sbill */ 6069Sbill #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \ 6169Sbill ((pte)->pg_m || (pte)->pg_swapm)) 6269Sbill 6369Sbill #ifdef KERNEL 6469Sbill struct pte *vtopte(); 6569Sbill 6669Sbill /* utilities defined in locore.s */ 6769Sbill extern struct pte Sysmap[]; 6869Sbill extern struct pte Usrptmap[]; 6969Sbill extern struct pte usrpt[]; 7069Sbill extern struct pte Swapmap[]; 7169Sbill extern struct pte Forkmap[]; 7269Sbill extern struct pte Xswapmap[]; 7369Sbill extern struct pte Xswap2map[]; 7469Sbill extern struct pte Pushmap[]; 7569Sbill extern struct pte Vfmap[]; 7669Sbill extern struct pte mmap[]; 7769Sbill extern struct pte mcrmap[]; 78730Sbill extern struct pte bufmap[]; 79*2174Swnj extern struct pte msgbufmap[]; 8069Sbill #endif 81