researchv9/sys/sun3/pte.h - view

File: [Research Unix] / researchv9 / sys / sun3 / pte.h
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:21:59 2018 UTC (8 years, 3 months ago) by root
Branches: belllabs, MAIN
CVS tags: researchv9-SUN3_old, researchv9-SUN3, HEAD

researchv9-SUN3(old)

/* @(#)pte.h 1.1 86/02/03 SMI */ /* * Copyright (c) 1985 by Sun Microsystems, Inc. */ /* * Sun 3 hardware page table entry * * There are two major kinds of pte's: those which have ever existed (and are * thus either now in core or on the swap device), and those which have * never existed, but which will be filled on demand at first reference. * There is a structure describing each. * Note that (pg_v && pg_fod) indicates a special (eg, mmapped) page: * it is not paged out (not dirty), nor filled in (still valid). */ #ifndef LOCORE struct pte { unsigned int pg_v:1; /* valid bit */ unsigned int pg_prot:2; /* access protection */ unsigned int pg_nc:1; /* no cache bit */ unsigned int pg_type:2; /* page type */ unsigned int pg_r:1; /* referenced */ unsigned int pg_m:1; /* modified */ unsigned int :3; unsigned int pg_fod:1; /* is fill on demand (=0) */ unsigned int :1; unsigned int pg_pfnum:19; /* page frame number */ }; struct fpte { unsigned int pg_v:1; /* valid bit */ unsigned int pg_prot:2; /* access protection */ unsigned int pg_nc:1; /* no cache bit */ unsigned int pg_type:2; /* page type */ unsigned int pg_source:5; /* file mapped from or TEXT or ZERO */ unsigned int pg_fod:1; /* is fill on demand (=1) */ unsigned int pg_blkno:20; /* file system block number */ }; #endif #define PG_V 0x80000000 /* page is valid */ #define PG_PROT 0x60000000 /* access protection mask */ #define PG_W 0x40000000 /* write enable bit */ #define PG_S 0x20000000 /* system page */ #define PG_NC 0x10000000 /* no cache bit */ #define PG_TYPE 0x0C000000 /* page type mask */ #define PG_R 0x02000000 /* page referenced bit */ #define PG_M 0x01000000 /* page modified bit */ #define PG_FOD 0x00100000 /* page fill-on-demand bit */ #define PG_PFNUM 0x0C07FFFF /* page # mask - XXX includes type */ #define PG_FMIN (NOFILE) #define PG_FZERO (NOFILE) #define PG_FTEXT (NOFILE+1) #define PG_FMAX (PG_FTEXT) #define PG_KW (PG_S|PG_W) #define PG_KR PG_S #define PG_UW PG_W /* kernel can still access */ #define PG_UWKW PG_UW #define PG_UR 0 /* kernel can still access */ #define PG_URKR PG_UR #define PG_UPAGE PG_KW /* sun3 u pages not user accessable */ #define PGT_MASK (3<<26) #define PGT_OBMEM (0<<26) /* onboard memory */ #define PGT_OBIO (1<<26) /* onboard I/O */ #define PGT_VME_D16 (2<<26) /* VMEbus 16-bit data */ #define PGT_VME_D32 (3<<26) /* VMEbus 32-bit data */ /* * Pte related macros */ #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && (pte)->pg_m) #if defined(KERNEL) && !defined(LOCORE) struct pte *vtopte(); /* utilities defined in locore.s */ extern struct pte Sysmap[]; extern struct pte Usrptmap[]; extern struct pte usrpt[]; extern struct pte Swapmap[]; extern struct pte Forkmap[]; extern struct pte Xswapmap[]; extern struct pte Xswap2map[]; extern struct pte Pushmap[]; extern struct pte Vfmap[]; extern struct pte mmap[]; extern struct pte msgbufmap[]; extern struct pte CMAP1[]; extern struct pte CMAP2[]; extern struct pte Prusrmap[]; #endif defined(KERNEL) && !defined(LOCORE)

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