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pte.h revision 1.8 
      1 /*	$NetBSD: pte.h,v 1.8 1996/11/13 22:21:04 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 /*
     31  * Alpha page table entry.
     32  * Things which are in the VMS PALcode but not in the OSF PALcode
     33  * are marked with "(VMS)".
     34  *
     35  * This information derived from pp. (II) 3-3 - (II) 3-6 and
     36  * (III) 3-3 - (III) 3-5 of the "Alpha Architecture Reference Manual" by
     37  * Richard L. Sites.
     38  */
     39 
     40 /*
     41  * Alpha Page Table Entry
     42  */
     43 
     44 #include <machine/alpha_cpu.h>
     45 
     46 typedef	alpha_pt_entry_t	pt_entry_t;
     47 
     48 #define	PT_ENTRY_NULL	((pt_entry_t *) 0)
     49 #define	PTESHIFT	3			/* pte size == 1 << PTESHIFT */
     50 
     51 #define	PG_V		ALPHA_PTE_VALID
     52 #define	PG_NV		0
     53 #define	PG_FOR		ALPHA_PTE_FAULT_ON_READ
     54 #define	PG_FOW		ALPHA_PTE_FAULT_ON_WRITE
     55 #define	PG_FOE		ALPHA_PTE_FAULT_ON_EXECUTE
     56 #define	PG_ASM		ALPHA_PTE_ASM
     57 #define	PG_GH		ALPHA_PTE_GRANULARITY
     58 #define	PG_KRE		ALPHA_PTE_KR
     59 #define	PG_URE		ALPHA_PTE_UR
     60 #define	PG_KWE		ALPHA_PTE_KW
     61 #define	PG_UWE		ALPHA_PTE_UW
     62 #define	PG_PROT		ALPHA_PTE_PROT
     63 #define	PG_RSVD		0x000000000000cc80	/* Reserved fpr hardware */
     64 #define	PG_WIRED	0x0000000000010000	/* Wired. [SOFTWARE] */
     65 #define	PG_FRAME	ALPHA_PTE_RAME
     66 #define	PG_SHIFT	32
     67 #define	PG_PFNUM(x)	ALPHA_PTE_TO_PFN(x)
     68 
     69 #if 0 /* XXX NOT HERE */
     70 #define	K0SEG_BEGIN	0xfffffc0000000000	/* unmapped, cached */
     71 #define	K0SEG_END	0xfffffe0000000000
     72 #define PHYS_UNCACHED	0x0000000040000000
     73 #endif
     74 
     75 #ifndef _LOCORE
     76 #if 0 /* XXX NOT HERE */
     77 #define	k0segtophys(x)	((vm_offset_t)(x) & 0x00000003ffffffff)
     78 #define	phystok0seg(x)	((vm_offset_t)(x) | K0SEG_BEGIN)
     79 
     80 #define phystouncached(x) ((vm_offset_t)(x) | PHYS_UNCACHED)
     81 #define uncachedtophys(x) ((vm_offset_t)(x) & ~PHYS_UNCACHED)
     82 #endif
     83 
     84 #define	PTEMASK		(NPTEPG - 1)
     85 #define	vatopte(va)	(((va) >> PGSHIFT) & PTEMASK)
     86 #define	vatoste(va)	(((va) >> SEGSHIFT) & PTEMASK)
     87 #define kvtol1pte(va) \
     88 	(((vm_offset_t)(va) >> (PGSHIFT + 2*(PGSHIFT-PTESHIFT))) & PTEMASK)
     89 
     90 #define	vatopa(va) \
     91 	((PG_PFNUM(*kvtopte(va)) << PGSHIFT) | ((vm_offset_t)(va) & PGOFSET))
     92 
     93 #define	ALPHA_STSIZE		((u_long)NBPG)			/* 8k */
     94 #define	ALPHA_MAX_PTSIZE	((u_long)(NPTEPG * NBPG))	/* 8M */
     95 
     96 #ifdef _KERNEL
     97 /*
     98  * Kernel virtual address to Sysmap entry and visa versa.
     99  */
    100 #define	kvtopte(va) \
    101 	(Sysmap + (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT))
    102 #define	ptetokv(pte) \
    103 	((((pt_entry_t *)(pte) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS)
    104 
    105 #define loadustp(stpte) {					\
    106 	Lev1map[kvtol1pte(VM_MIN_ADDRESS)] = stpte;		\
    107 	ALPHA_TBIAP();						\
    108 }
    109 
    110 extern	pt_entry_t *Lev1map;		/* Alpha Level One page table */
    111 extern	pt_entry_t *Sysmap;		/* kernel pte table */
    112 extern	vm_size_t Sysmapsize;		/* number of pte's in Sysmap */
    113 #endif
    114 #endif
    115