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pte.h revision 1.1 
      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 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  *	from: Utah Hdr: pte.h 1.11 89/09/03
     39  *	from: @(#)pte.h	7.3 (Berkeley) 5/8/91
     40  *	$Id: pte.h,v 1.1 1993/08/09 04:44:11 mycroft Exp $
     41  */
     42 
     43 /*
     44  * HP300 hardware segment/page table entries
     45  */
     46 
     47 struct ste {
     48 	unsigned int	sg_pfnum:20;	/* page table frame number */
     49 	unsigned int	:8;		/* reserved at 0 */
     50 	unsigned int	:1;		/* reserved at 1 */
     51 	unsigned int	sg_prot:1;	/* write protect bit */
     52 	unsigned int	sg_v:2;		/* valid bits */
     53 };
     54 
     55 struct pte {
     56 	unsigned int	pg_pfnum:20;	/* page frame number or 0 */
     57 	unsigned int	:3;
     58 	unsigned int	pg_w:1;		/* is wired */
     59 	unsigned int	:1;		/* reserved at zero */
     60 	unsigned int	pg_ci:1;	/* cache inhibit bit */
     61 	unsigned int	:1;		/* reserved at zero */
     62 	unsigned int	pg_m:1;		/* hardware modified (dirty) bit */
     63 	unsigned int	pg_u:1;		/* hardware used (reference) bit */
     64 	unsigned int	pg_prot:1;	/* write protect bit */
     65 	unsigned int	pg_v:2;		/* valid bit */
     66 };
     67 
     68 typedef struct ste	st_entry_t;	/* segment table entry */
     69 typedef struct pte	pt_entry_t;	/* Mach page table entry */
     70 
     71 #define	PT_ENTRY_NULL	((pt_entry_t *) 0)
     72 #define	ST_ENTRY_NULL	((st_entry_t *) 0)
     73 
     74 #define	SG_V		0x00000002	/* segment is valid */
     75 #define	SG_NV		0x00000000
     76 #define	SG_PROT		0x00000004	/* access protection mask */
     77 #define	SG_RO		0x00000004
     78 #define	SG_RW		0x00000000
     79 #define	SG_FRAME	0xfffff000
     80 #define	SG_IMASK	0xffc00000
     81 #define	SG_PMASK	0x003ff000
     82 #define	SG_ISHIFT	22
     83 #define	SG_PSHIFT	12
     84 
     85 #define	PG_V		0x00000001
     86 #define	PG_NV		0x00000000
     87 #define	PG_PROT		0x00000004
     88 #define	PG_U		0x00000008
     89 #define	PG_M		0x00000010
     90 #define	PG_W		0x00000100
     91 #define	PG_RO		0x00000004
     92 #define	PG_RW		0x00000000
     93 #define	PG_FRAME	0xfffff000
     94 #define	PG_CI		0x00000040
     95 #define PG_SHIFT	12
     96 #define	PG_PFNUM(x)	(((x) & PG_FRAME) >> PG_SHIFT)
     97 
     98 #define HP_STSIZE	HP_PAGE_SIZE	/* segment table size */
     99 #define HP_MAX_PTSIZE	HP_SEG_SIZE	/* max size of UPT */
    100 #define HP_MAX_KPTSIZE	0x100000	/* max memory to allocate to KPT */
    101 #define HP_PTBASE	0x10000000	/* UPT map base address */
    102 #define HP_PTMAXSIZE	0x70000000	/* UPT map maximum size */
    103 
    104 /*
    105  * Kernel virtual address to page table entry and to physical address.
    106  */
    107 #define	kvtopte(va) \
    108 	(&Sysmap[((unsigned)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT])
    109 #define	ptetokv(pt) \
    110 	((((pt_entry_t *)(pt) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS)
    111 #define	kvtophys(va) \
    112 	((kvtopte(va)->pg_pfnum << PGSHIFT) | ((int)(va) & PGOFSET))
    113 
    114