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Annotation of Net2/arch/i386/include/pmap.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1991 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * the Systems Programming Group of the University of Utah Computer
        !             7:  * Science Department and William Jolitz of UUNET Technologies Inc.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *     This product includes software developed by the University of
        !            20:  *     California, Berkeley and its contributors.
        !            21:  * 4. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  *     @(#)pmap.h      7.4 (Berkeley) 5/12/91
        !            38:  */
        !            39: 
        !            40: /*
        !            41:  * Derived from hp300 version by Mike Hibler, this version by William
        !            42:  * Jolitz uses a recursive map [a pde points to the page directory] to
        !            43:  * map the page tables using the pagetables themselves. This is done to
        !            44:  * reduce the impact on kernel virtual memory for lots of sparse address
        !            45:  * space, and to reduce the cost of memory to each process.
        !            46:  *
        !            47:  * from hp300: @(#)pmap.h      7.2 (Berkeley) 12/16/90
        !            48:  */
        !            49: 
        !            50: #ifndef        _PMAP_MACHINE_
        !            51: #define        _PMAP_MACHINE_  1
        !            52: 
        !            53: /*
        !            54:  * 386 page table entry and page table directory
        !            55:  * W.Jolitz, 8/89
        !            56:  */
        !            57: 
        !            58: struct pde
        !            59: {
        !            60: unsigned int   
        !            61:                pd_v:1,                 /* valid bit */
        !            62:                pd_prot:2,              /* access control */
        !            63:                pd_mbz1:2,              /* reserved, must be zero */
        !            64:                pd_u:1,                 /* hardware maintained 'used' bit */
        !            65:                :1,                     /* not used */
        !            66:                pd_mbz2:2,              /* reserved, must be zero */
        !            67:                :3,                     /* reserved for software */
        !            68:                pd_pfnum:20;            /* physical page frame number of pte's*/
        !            69: };
        !            70: 
        !            71: #define        PD_MASK         0xffc00000      /* page directory address bits */
        !            72: #define        PT_MASK         0x003ff000      /* page table address bits */
        !            73: #define        PD_SHIFT        22              /* page directory address shift */
        !            74: #define        PG_SHIFT        12              /* page table address shift */
        !            75: 
        !            76: struct pte
        !            77: {
        !            78: unsigned int   
        !            79:                pg_v:1,                 /* valid bit */
        !            80:                pg_prot:2,              /* access control */
        !            81:                pg_mbz1:2,              /* reserved, must be zero */
        !            82:                pg_u:1,                 /* hardware maintained 'used' bit */
        !            83:                pg_m:1,                 /* hardware maintained modified bit */
        !            84:                pg_mbz2:2,              /* reserved, must be zero */
        !            85:                pg_w:1,                 /* software, wired down page */
        !            86:                :1,                     /* software (unused) */
        !            87:                pg_nc:1,                /* 'uncacheable page' bit */
        !            88:                pg_pfnum:20;            /* physical page frame number */
        !            89: };
        !            90: 
        !            91: #define        PG_V            0x00000001
        !            92: #define        PG_RO           0x00000000
        !            93: #define        PG_RW           0x00000002
        !            94: #define        PG_u            0x00000004
        !            95: #define        PG_PROT         0x00000006 /* all protection bits . */
        !            96: #define        PG_W            0x00000200
        !            97: #define PG_N           0x00000800 /* Non-cacheable */
        !            98: #define        PG_M            0x00000040
        !            99: #define PG_U           0x00000020
        !           100: #define        PG_FRAME        0xfffff000
        !           101: 
        !           102: #define        PG_NOACC        0
        !           103: #define        PG_KR           0x00000000
        !           104: #define        PG_KW           0x00000002
        !           105: #define        PG_URKR         0x00000004
        !           106: #define        PG_URKW         0x00000004
        !           107: #define        PG_UW           0x00000006
        !           108: 
        !           109: /* Garbage for current bastardized pager that assumes a hp300 */
        !           110: #define        PG_NV   0
        !           111: #define        PG_CI   0
        !           112: /*
        !           113:  * Page Protection Exception bits
        !           114:  */
        !           115: 
        !           116: #define PGEX_P         0x01    /* Protection violation vs. not present */
        !           117: #define PGEX_W         0x02    /* during a Write cycle */
        !           118: #define PGEX_U         0x04    /* access from User mode (UPL) */
        !           119: 
        !           120: typedef struct pde     pd_entry_t;     /* page directory entry */
        !           121: typedef struct pte     pt_entry_t;     /* Mach page table entry */
        !           122: 
        !           123: /*
        !           124:  * One page directory, shared between
        !           125:  * kernel and user modes.
        !           126:  */
        !           127: #define I386_PAGE_SIZE NBPG
        !           128: #define I386_PDR_SIZE  NBPDR
        !           129: 
        !           130: #define I386_KPDES     8 /* KPT page directory size */
        !           131: #define I386_UPDES     NBPDR/sizeof(struct pde)-8 /* UPT page directory size */
        !           132: 
        !           133: #define        UPTDI           0x3f6           /* ptd entry for u./kernel&user stack */
        !           134: #define        PTDPTDI         0x3f7           /* ptd entry that points to ptd! */
        !           135: #define        KPTDI_FIRST     0x3f8           /* start of kernel virtual pde's */
        !           136: #define        KPTDI_LAST      0x3fA           /* last of kernel virtual pde's */
        !           137: 
        !           138: /*
        !           139:  * Address of current and alternate address space page table maps
        !           140:  * and directories.
        !           141:  */
        !           142: #ifdef KERNEL
        !           143: extern struct pte      PTmap[], APTmap[], Upte;
        !           144: extern struct pde      PTD[], APTD[], PTDpde, APTDpde, Upde;
        !           145: extern pt_entry_t      *Sysmap;
        !           146: 
        !           147: extern int     IdlePTD;        /* physical address of "Idle" state directory */
        !           148: #endif
        !           149: 
        !           150: /*
        !           151:  * virtual address to page table entry and
        !           152:  * to physical address. Likewise for alternate address space.
        !           153:  * Note: these work recursively, thus vtopte of a pte will give
        !           154:  * the corresponding pde that in turn maps it.
        !           155:  */
        !           156: #define        vtopte(va)      (PTmap + i386_btop(va))
        !           157: #define        kvtopte(va)     vtopte(va)
        !           158: #define        ptetov(pt)      (i386_ptob(pt - PTmap)) 
        !           159: #define        vtophys(va)  (i386_ptob(vtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET))
        !           160: #define ispt(va)       ((va) >= UPT_MIN_ADDRESS && (va) <= KPT_MAX_ADDRESS)
        !           161: 
        !           162: #define        avtopte(va)     (APTmap + i386_btop(va))
        !           163: #define        ptetoav(pt)     (i386_ptob(pt - APTmap)) 
        !           164: #define        avtophys(va)  (i386_ptob(avtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET))
        !           165: 
        !           166: /*
        !           167:  * macros to generate page directory/table indicies
        !           168:  */
        !           169: 
        !           170: #define        pdei(va)        (((va)&PD_MASK)>>PD_SHIFT)
        !           171: #define        ptei(va)        (((va)&PT_MASK)>>PT_SHIFT)
        !           172: 
        !           173: /*
        !           174:  * Pmap stuff
        !           175:  */
        !           176: 
        !           177: struct pmap {
        !           178:        pd_entry_t              *pm_pdir;       /* KVA of page directory */
        !           179:        boolean_t               pm_pdchanged;   /* pdir changed */
        !           180:        short                   pm_dref;        /* page directory ref count */
        !           181:        short                   pm_count;       /* pmap reference count */
        !           182:        simple_lock_data_t      pm_lock;        /* lock on pmap */
        !           183:        struct pmap_statistics  pm_stats;       /* pmap statistics */
        !           184:        long                    pm_ptpages;     /* more stats: PT pages */
        !           185: };
        !           186: 
        !           187: typedef struct pmap    *pmap_t;
        !           188: 
        !           189: #ifdef KERNEL
        !           190: extern pmap_t          kernel_pmap;
        !           191: #endif
        !           192: 
        !           193: /*
        !           194:  * Macros for speed
        !           195:  */
        !           196: #define PMAP_ACTIVATE(pmapp, pcbp) \
        !           197:        if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) {  \
        !           198:                (pcbp)->pcb_cr3 = \
        !           199:                    pmap_extract(kernel_pmap, (pmapp)->pm_pdir); \
        !           200:                if ((pmapp) == &curproc->p_vmspace->vm_pmap) \
        !           201:                        load_cr3((pcbp)->pcb_cr3); \
        !           202:                (pmapp)->pm_pdchanged = FALSE; \
        !           203:        }
        !           204: 
        !           205: #define PMAP_DEACTIVATE(pmapp, pcbp)
        !           206: 
        !           207: /*
        !           208:  * For each vm_page_t, there is a list of all currently valid virtual
        !           209:  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
        !           210:  */
        !           211: typedef struct pv_entry {
        !           212:        struct pv_entry *pv_next;       /* next pv_entry */
        !           213:        pmap_t          pv_pmap;        /* pmap where mapping lies */
        !           214:        vm_offset_t     pv_va;          /* virtual address for mapping */
        !           215:        int             pv_flags;       /* flags */
        !           216: } *pv_entry_t;
        !           217: 
        !           218: #define        PV_ENTRY_NULL   ((pv_entry_t) 0)
        !           219: 
        !           220: #define        PV_CI           0x01    /* all entries must be cache inhibited */
        !           221: #define PV_PTPAGE      0x02    /* entry maps a page table page */
        !           222: 
        !           223: #ifdef KERNEL
        !           224: 
        !           225: pv_entry_t     pv_table;               /* array of entries, one per page */
        !           226: 
        !           227: #define pa_index(pa)           atop(pa - vm_first_phys)
        !           228: #define pa_to_pvh(pa)          (&pv_table[pa_index(pa)])
        !           229: 
        !           230: #define        pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)
        !           231: 
        !           232: #endif KERNEL
        !           233: 
        !           234: #endif _PMAP_MACHINE_

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