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Annotation of Net2/arch/amiga/include/pmap.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1987 Carnegie-Mellon University
        !             3:  * Copyright (c) 1991 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 and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)pmap.h      7.6 (Berkeley) 5/10/91
        !            39:  */
        !            40: 
        !            41: #ifndef        _PMAP_MACHINE_
        !            42: #define        _PMAP_MACHINE_
        !            43: 
        !            44: #define AMIGA_PAGE_SIZE        NBPG
        !            45: #define AMIGA_SEG_SIZE NBSEG
        !            46: 
        !            47: /*
        !            48:  * Pmap stuff
        !            49:  */
        !            50: struct pmap {
        !            51:        struct pte              *pm_ptab;       /* KVA of page table */
        !            52:        struct ste              *pm_stab;       /* KVA of segment table */
        !            53:        int                     pm_stchanged;   /* ST changed */
        !            54:        short                   pm_sref;        /* segment table ref count */
        !            55:        short                   pm_count;       /* pmap reference count */
        !            56:        simple_lock_data_t      pm_lock;        /* lock on pmap */
        !            57:        struct pmap_statistics  pm_stats;       /* pmap statistics */
        !            58:        long                    pm_ptpages;     /* more stats: PT pages */
        !            59: };
        !            60: 
        !            61: typedef struct pmap    *pmap_t;
        !            62: 
        !            63: extern pmap_t          kernel_pmap;
        !            64: 
        !            65: /*
        !            66:  * Macros for speed
        !            67:  */
        !            68: #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
        !            69:        if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
        !            70:                (pcbp)->pcb_ustp = \
        !            71:                    amiga_btop(pmap_extract(kernel_pmap, (pmapp)->pm_stab)); \
        !            72:                if (iscurproc) \
        !            73:                        loadustp((pcbp)->pcb_ustp); \
        !            74:                (pmapp)->pm_stchanged = FALSE; \
        !            75:        }
        !            76: #define PMAP_DEACTIVATE(pmapp, pcbp)
        !            77: 
        !            78: /*
        !            79:  * For each vm_page_t, there is a list of all currently valid virtual
        !            80:  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
        !            81:  */
        !            82: typedef struct pv_entry {
        !            83:        struct pv_entry *pv_next;       /* next pv_entry */
        !            84:        struct pmap     *pv_pmap;       /* pmap where mapping lies */
        !            85:        vm_offset_t     pv_va;          /* virtual address for mapping */
        !            86:        struct ste      *pv_ptste;      /* non-zero if VA maps a PT page */
        !            87:        struct pmap     *pv_ptpmap;     /* if pv_ptste, pmap for PT page */
        !            88:        int             pv_flags;       /* flags */
        !            89: } *pv_entry_t;
        !            90: 
        !            91: #define        PV_CI           0x01    /* all entries must be cache inhibited */
        !            92: #define PV_PTPAGE      0x02    /* entry maps a page table page */
        !            93: 
        !            94: #ifdef KERNEL
        !            95: pv_entry_t     pv_table;               /* array of entries, one per page */
        !            96: 
        !            97: #define pa_index(pa)           atop(pa - vm_first_phys)
        !            98: #define pa_to_pvh(pa)          (&pv_table[pa_index(pa)])
        !            99: 
        !           100: #define        pmap_kernel()                   (kernel_pmap)
        !           101: #define        pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)
        !           102: 
        !           103: extern struct pte *Sysmap;
        !           104: extern char *vmmap;                    /* map for mem, dumps, etc. */
        !           105: #endif KERNEL
        !           106: 
        !           107: #endif _PMAP_MACHINE_

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