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Annotation of 41BSD/sys/h/pte.h, revision 1.1.1.1

1.1       root        1: /*     pte.h   4.1     11/9/80 */
                      2: 
                      3: /*
                      4:  * VAX page table entry
                      5:  *
                      6:  * There are two major kinds of pte's: those which have ever existed (and are
                      7:  * thus either now in core or on the swap device), and those which have
                      8:  * never existed, but which will be filled on demand at first reference.
                      9:  * There is a structure describing each.  There is also an ancillary
                     10:  * structure used in page clustering.
                     11:  */
                     12: 
                     13: struct pte
                     14: {
                     15: unsigned int   pg_pfnum:21,            /* core page frame number or 0 */
                     16:                :2,
                     17:                pg_vreadm:1,            /* modified since vread (or with _m) */
                     18:                pg_swapm:1,             /* have to write back to swap */
                     19:                pg_fod:1,               /* is fill on demand (=0) */
                     20:                pg_m:1,                 /* hardware maintained modified bit */
                     21:                pg_prot:4,              /* access control */
                     22:                pg_v:1;                 /* valid bit */
                     23: };
                     24: struct hpte
                     25: {
                     26: unsigned int   pg_pfnum:21,
                     27:                :2,
                     28:                pg_high:9;              /* special for clustering */
                     29: };
                     30: struct fpte
                     31: {
                     32: unsigned int   pg_blkno:20,            /* file system block number */
                     33:                pg_fileno:5,            /* file mapped from or TEXT or ZERO */
                     34:                pg_fod:1,               /* is fill on demand (=1) */
                     35:                :1,
                     36:                pg_prot:4,
                     37:                pg_v:1;
                     38: };
                     39: 
                     40: #define        PG_V            0x80000000
                     41: #define        PG_PROT         0x78000000
                     42: #define        PG_M            0x04000000
                     43: #define        PG_VREADM       0x00800000
                     44: #define        PG_PFNUM        0x001fffff
                     45: 
                     46: #define        PG_FZERO        (NOFILE)
                     47: #define        PG_FTEXT        (NOFILE+1)
                     48: #define        PG_FMAX         (PG_FTEXT)
                     49: 
                     50: #define        PG_NOACC        0
                     51: #define        PG_KW           0x10000000
                     52: #define        PG_KR           0x18000000
                     53: #define        PG_UW           0x20000000
                     54: #define        PG_URKW         0x70000000
                     55: #define        PG_URKR         0x78000000
                     56: 
                     57: /*
                     58:  * Pte related macros
                     59:  */
                     60: #define        dirty(pte)      ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \
                     61:                            ((pte)->pg_m || (pte)->pg_swapm))
                     62: 
                     63: #ifdef KERNEL
                     64: struct pte *vtopte();
                     65: 
                     66: /* utilities defined in locore.s */
                     67: extern struct pte Sysmap[];
                     68: extern struct pte Usrptmap[];
                     69: extern struct pte usrpt[];
                     70: extern struct pte Swapmap[];
                     71: extern struct pte Forkmap[];
                     72: extern struct pte Xswapmap[];
                     73: extern struct pte Xswap2map[];
                     74: extern struct pte Pushmap[];
                     75: extern struct pte Vfmap[];
                     76: extern struct pte mmap[];
                     77: extern struct pte mcrmap[];
                     78: extern struct pte bufmap[];
                     79: #endif

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