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Annotation of 43BSDReno/sys/tahoe/pte.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)pte.h       7.3 (Berkeley) 8/31/89
                      7:  */
                      8: 
                      9: /*
                     10:  * Tahoe page table entry
                     11:  *
                     12:  * There are two major kinds of pte's: those which have ever existed (and are
                     13:  * thus either now in core or on the swap device), and those which have
                     14:  * never existed, but which will be filled on demand at first reference.
                     15:  * There is a structure describing each.  There is also an ancillary
                     16:  * structure used in page clustering.
                     17:  */
                     18: 
                     19: #ifndef LOCORE
                     20: struct pte
                     21: {
                     22: unsigned int   
                     23:                pg_v:1,                 /* valid bit */
                     24:                pg_prot:4,              /* access control */
                     25:                pg_fod:1,               /* is fill on demand (=0) */
                     26:                :1,                     /* must write back to swap (unused) */
                     27:                pg_nc:1,                /* 'uncacheable page' bit */
                     28:                pg_m:1,                 /* hardware maintained modified bit */
                     29:                pg_u:1,                 /* hardware maintained 'used' bit */
                     30:                pg_pfnum:22;            /* core page frame number or 0 */
                     31: };
                     32: struct hpte
                     33: {
                     34: unsigned int   
                     35:                pg_high:10,             /* special for clustering */
                     36:                pg_pfnum:22;
                     37: };
                     38: struct fpte
                     39: {
                     40: unsigned int   
                     41:                pg_v:1,
                     42:                pg_prot:4,
                     43:                pg_fod:1,               /* is fill on demand (=1) */
                     44:                :1,
                     45:                pg_fileno:1,            /* file mapped from or TEXT or ZERO */
                     46:                pg_blkno:24;            /* file system block number */
                     47: };
                     48: #endif
                     49: 
                     50: #define        PG_V            0x80000000
                     51: #define        PG_PROT         0x78000000 /* all protection bits  (dorit). */
                     52: #define        PG_FOD          0x04000000
                     53: #define        PG_SWAPM        0x02000000
                     54: #define PG_N           0x01000000 /* Non-cacheable */
                     55: #define        PG_M            0x00800000
                     56: #define PG_U           0x00400000
                     57: #define        PG_PFNUM        0x003fffff
                     58: 
                     59: #define        PG_FZERO        0
                     60: #define        PG_FTEXT        1
                     61: #define        PG_FMAX         (PG_FTEXT)
                     62: 
                     63: #define        PG_NOACC        0
                     64: #define        PG_KR           0x40000000
                     65: #define        PG_KW           0x60000000
                     66: #define        PG_URKR         0x50000000
                     67: #define        PG_URKW         0x70000000
                     68: #define        PG_UW           0x78000000
                     69: 
                     70: /*
                     71:  * Pte related macros
                     72:  */
                     73: #define        dirty(pte)      ((pte)->pg_m)
                     74: 
                     75: /*
                     76:  * Kernel virtual address to page table entry and to physical address.
                     77:  */
                     78: #define        kvtopte(va) (&Sysmap[((int)(va) &~ KERNBASE) >> PGSHIFT])
                     79: #define        kvtophys(x) ((kvtopte(x)->pg_pfnum << PGSHIFT) | ((int)(x) & PGOFSET))
                     80: 
                     81: #ifndef LOCORE
                     82: #ifdef KERNEL
                     83: /* utilities defined in locore.s */
                     84: extern struct pte Sysmap[];
                     85: extern struct pte Usrptmap[];
                     86: extern struct pte usrpt[];
                     87: extern struct pte Swapmap[];
                     88: extern struct pte Forkmap[];
                     89: extern struct pte Xswapmap[];
                     90: extern struct pte Xswap2map[];
                     91: extern struct pte Pushmap[];
                     92: extern struct pte Vfmap[];
                     93: extern struct pte mmap[];
                     94: extern struct pte msgbufmap[];
                     95: extern struct pte kmempt[], ekmempt[];
                     96: #ifdef NFS
                     97: extern struct pte Nfsiomap[];
                     98: #endif
                     99: #ifdef MFS
                    100: extern struct pte Mfsiomap[];
                    101: #endif
                    102: #endif
                    103: #endif

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