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Annotation of 43BSDReno/sys/hp300/pte.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution is only permitted until one year after the first shipment
        !            11:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            12:  * binary forms are permitted provided that: (1) source distributions retain
        !            13:  * this entire copyright notice and comment, and (2) distributions including
        !            14:  * binaries display the following acknowledgement:  This product includes
        !            15:  * software developed by the University of California, Berkeley and its
        !            16:  * contributors'' in the documentation or other materials provided with the
        !            17:  * distribution and in all advertising materials mentioning features or use
        !            18:  * of this software.  Neither the name of the University nor the names of
        !            19:  * its contributors may be used to endorse or promote products derived from
        !            20:  * this software without specific prior written permission.
        !            21:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            22:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            23:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            24:  *
        !            25:  * from: Utah $Hdr: pte.h 1.11 89/09/03$
        !            26:  *
        !            27:  *     @(#)pte.h       7.1 (Berkeley) 5/8/90
        !            28:  */
        !            29: 
        !            30: /*
        !            31:  * HP300 page table entry
        !            32:  *
        !            33:  * There are two major kinds of pte's: those which have ever existed (and are
        !            34:  * thus either now in core or on the swap device), and those which have
        !            35:  * never existed, but which will be filled on demand at first reference.
        !            36:  * There is a structure describing each.  There is also an ancillary
        !            37:  * structure used in page clustering.
        !            38:  */
        !            39: 
        !            40: #ifndef LOCORE
        !            41: struct ste
        !            42: {
        !            43: unsigned int   sg_pfnum:20,            /* page table frame number */
        !            44:                :8,                     /* reserved at 0 */
        !            45:                :1,                     /* reserved at 1 */
        !            46:                sg_prot:1,              /* write protect bit */
        !            47:                sg_v:2;                 /* valid bits */
        !            48: };
        !            49: 
        !            50: struct pte
        !            51: {
        !            52: unsigned int   pg_pfnum:20,            /* page frame number or 0 */
        !            53:                :3,
        !            54:                pg_fod:1,               /* is fill on demand (=0) */
        !            55:                :1,                     /* reserved at zero */
        !            56:                pg_ci:1,                /* cache inhibit bit */
        !            57:                :1,                     /* reserved at zero */
        !            58:                pg_m:1,                 /* hardware modified (dirty) bit */
        !            59:                pg_u:1,                 /* hardware used (reference) bit */
        !            60:                pg_prot:1,              /* write protect bit */
        !            61:                pg_v:2;                 /* valid bit */
        !            62: };
        !            63: 
        !            64: /* not used */
        !            65: struct hpte
        !            66: {
        !            67: unsigned int   pg_pfnum:20,
        !            68:                pg_high:12;             /* special for clustering */
        !            69: };
        !            70: 
        !            71: struct fpte
        !            72: {
        !            73: unsigned int   pg_blkno:22,            /* file system block number */
        !            74:                pg_fileno:1,            /* file mapped from or TEXT or ZERO */
        !            75:                pg_fod:1,               /* is fill on demand (=1) */
        !            76:                :6,
        !            77:                pg_v:2;
        !            78: };
        !            79: #endif
        !            80: 
        !            81: #define        SG_V            0x00000002
        !            82: #define        SG_NV           0x00000000
        !            83: #define        SG_PROT         0x00000004
        !            84: #define        SG_RO           0x00000004
        !            85: #define        SG_RW           0x00000000
        !            86: #define        SG_FRAME        0xfffff000
        !            87: #define        SG_IMASK        0xffc00000
        !            88: #define        SG_PMASK        0x003ff000
        !            89: #define        SG_ISHIFT       22
        !            90: #define        SG_PSHIFT       12
        !            91: 
        !            92: #define        PG_V            0x00000001
        !            93: #define        PG_NV           0x00000000
        !            94: #define        PG_PROT         0x00000004
        !            95: #define        PG_U            0x00000008
        !            96: #define        PG_M            0x00000010
        !            97: #define        PG_FOD          0x00000100
        !            98: #define        PG_RO           0x00000004
        !            99: #define        PG_RW           0x00000000
        !           100: #define        PG_FRAME        0xfffff000
        !           101: #define        PG_CI           0x00000040
        !           102: #define        PG_PFNUM(x)     (((x) & PG_FRAME) >> PGSHIFT)
        !           103: 
        !           104: /*
        !           105:  * Pseudo protections.
        !           106:  * Note that PG_URKW is not defined intuitively, but it is currently only
        !           107:  * used in vgetu() to initialize the u-area PTEs in the process address
        !           108:  * space.  Since the kernel never accesses the u-area thru these we are ok.
        !           109:  */
        !           110: #define        PG_KW           PG_RW
        !           111: #define        PG_URKR         PG_RO
        !           112: #define        PG_URKW         PG_RO
        !           113: #define        PG_UW           PG_RW
        !           114: 
        !           115: #define        PG_FZERO        0
        !           116: #define        PG_FTEXT        1
        !           117: #define        PG_FMAX         (PG_FTEXT)
        !           118: 
        !           119: /*
        !           120:  * Pte related macros
        !           121:  */
        !           122: #define        dirty(pte)      ((pte)->pg_m)
        !           123: 
        !           124: /*
        !           125:  * Kernel virtual address to page table entry and to physical address.
        !           126:  */
        !           127: #define        kvtopte(va) (&Sysmap[((unsigned)(va) &~ KERNBASE) >> PGSHIFT])
        !           128: #define        ptetokv(pt) ((((struct pte *)(pt) - Sysmap) << PGSHIFT) | KERNBASE)
        !           129: #define        kvtophys(x) ((kvtopte(x)->pg_pfnum << PGSHIFT) | ((int)(x) & PGOFSET))
        !           130: 
        !           131: #if defined(KERNEL) && !defined(LOCORE)
        !           132: /* utilities defined in locore.s */
        !           133: extern struct pte Sysmap[];
        !           134: extern struct pte Usrptmap[];
        !           135: extern struct pte usrpt[];
        !           136: extern struct pte Swapmap[];
        !           137: extern struct pte Forkmap[];
        !           138: extern struct pte Xswapmap[];
        !           139: extern struct pte Xswap2map[];
        !           140: extern struct pte Pushmap[];
        !           141: extern struct pte Vfmap[];
        !           142: extern struct pte mmap[];
        !           143: extern struct pte msgbufmap[];
        !           144: extern struct pte kmempt[], ekmempt[];
        !           145: extern struct ste Sysseg[];
        !           146: #endif /* defined(KERNEL) && !defined(LOCORE) */

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