1*31417Smckusick /* pte.h 1.4 87/06/06 */ 224005Ssam 324005Ssam /* 424005Ssam * Tahoe page table entry 524005Ssam * 624005Ssam * There are two major kinds of pte's: those which have ever existed (and are 724005Ssam * thus either now in core or on the swap device), and those which have 824005Ssam * never existed, but which will be filled on demand at first reference. 924005Ssam * There is a structure describing each. There is also an ancillary 1024005Ssam * structure used in page clustering. 1124005Ssam */ 1224005Ssam 1324005Ssam #ifndef LOCORE 1424005Ssam struct pte 1524005Ssam { 1624005Ssam unsigned int 1724005Ssam pg_v:1, /* valid bit */ 1824005Ssam pg_prot:4, /* access control */ 1924005Ssam pg_fod:1, /* is fill on demand (=0) */ 2025678Ssam :1, /* must write back to swap (unused) */ 2124005Ssam pg_nc:1, /* 'uncacheable page' bit */ 2224005Ssam pg_m:1, /* hardware maintained modified bit */ 2325678Ssam pg_u:1, /* hardware maintained 'used' bit */ 2424005Ssam pg_pfnum:22; /* core page frame number or 0 */ 2524005Ssam }; 2624005Ssam struct hpte 2724005Ssam { 2824005Ssam unsigned int 2924005Ssam pg_high:10, /* special for clustering */ 3024005Ssam pg_pfnum:22; 3124005Ssam }; 3224005Ssam struct fpte 3324005Ssam { 3424005Ssam unsigned int 3524005Ssam pg_v:1, 3624005Ssam pg_prot:4, 3724005Ssam pg_fod:1, /* is fill on demand (=1) */ 3824005Ssam :1, 3925678Ssam pg_fileno:1, /* file mapped from or TEXT or ZERO */ 4025678Ssam pg_blkno:24; /* file system block number */ 4124005Ssam }; 4224005Ssam #endif 4324005Ssam 4424005Ssam #define PG_V 0x80000000 4524005Ssam #define PG_PROT 0x78000000 /* all protection bits (dorit). */ 4624005Ssam #define PG_FOD 0x04000000 4724005Ssam #define PG_SWAPM 0x02000000 4824005Ssam #define PG_N 0x01000000 /* Non-cacheable */ 4924005Ssam #define PG_M 0x00800000 5025678Ssam #define PG_U 0x00400000 /* not currently used */ 5124005Ssam #define PG_PFNUM 0x003fffff 5224005Ssam 5325678Ssam #define PG_FZERO 0 5425678Ssam #define PG_FTEXT 1 5524005Ssam #define PG_FMAX (PG_FTEXT) 5624005Ssam 5724005Ssam #define PG_NOACC 0 5824005Ssam #define PG_KR 0x40000000 5924005Ssam #define PG_KW 0x60000000 6024005Ssam #define PG_URKR 0x50000000 6124005Ssam #define PG_URKW 0x70000000 6224005Ssam #define PG_UW 0x78000000 6324005Ssam 6424005Ssam /* 6524005Ssam * Pte related macros 6624005Ssam */ 6725678Ssam #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && (pte)->pg_m) 6824005Ssam 6924005Ssam #ifndef LOCORE 7024005Ssam #ifdef KERNEL 7124005Ssam /* utilities defined in locore.s */ 7224005Ssam extern struct pte Sysmap[]; 7324005Ssam extern struct pte Usrptmap[]; 7424005Ssam extern struct pte usrpt[]; 7524005Ssam extern struct pte Swapmap[]; 7624005Ssam extern struct pte Forkmap[]; 7724005Ssam extern struct pte Xswapmap[]; 7824005Ssam extern struct pte Xswap2map[]; 7924005Ssam extern struct pte Pushmap[]; 8024005Ssam extern struct pte Vfmap[]; 8124005Ssam extern struct pte mmap[]; 8224005Ssam extern struct pte msgbufmap[]; 83*31417Smckusick extern struct pte kmempt[], ekmempt[]; 8424005Ssam #endif 8524005Ssam #endif 86