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      1 /*	$NetBSD: pmap3.h,v 1.51 2020/03/14 14:05:44 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass and Gordon W. Ross.
      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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifdef _KERNEL
     33 /*
     34  * Physical map structures exported to the VM code.
     35  */
     36 
     37 struct pmap {
     38 	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
     39 	int             	pm_ctxnum;	/* MMU context number */
     40 	u_int             	pm_refcount;	/* reference count */
     41 	int             	pm_version;
     42 };
     43 
     44 /*
     45  * We give the pmap code a chance to resolve faults by
     46  * reloading translations that it was forced to unload.
     47  * This function does that, and calls vm_fault if it
     48  * could not resolve the fault by reloading the MMU.
     49  */
     50 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
     51 
     52 /* This lets us have some say in choosing VA locations. */
     53 extern void pmap_prefer(vaddr_t, vaddr_t *, int);
     54 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap), (td))
     55 
     56 /* This needs to be a macro for kern_sysctl.c */
     57 extern segsz_t pmap_resident_pages(pmap_t);
     58 #define	pmap_resident_count(pmap)	(pmap_resident_pages(pmap))
     59 
     60 /* This needs to be a macro for vm_mmap.c */
     61 extern segsz_t pmap_wired_pages(pmap_t);
     62 #define	pmap_wired_count(pmap)	(pmap_wired_pages(pmap))
     63 
     64 /* We use the PA plus some low bits for device mmap. */
     65 #define pmap_phys_address(addr) 	(addr)
     66 
     67 /* Map a given physical region to a virtual region */
     68 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
     69 
     70 static __inline bool
     71 pmap_remove_all(struct pmap *pmap)
     72 {
     73 	/* Nothing. */
     74 	return false;
     75 }
     76 
     77 /*
     78  * Since PTEs also contain type bits, we have to have some way
     79  * to tell pmap_enter `this is an IO page' or `this is not to
     80  * be cached'.  Since physical addresses are always aligned, we
     81  * can do this with the low order bits.
     82  *
     83  * The values below must agree with pte.h such that:
     84  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
     85  */
     86 #define	PMAP_OBMEM	0x00	/* unused */
     87 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
     88 #define	PMAP_VME16	0x08	/* etc */
     89 #define	PMAP_VME32	0x0C	/* etc */
     90 #define	PMAP_NC		0x10	/* tells pmap_enter to set PG_NC */
     91 #define	PMAP_SPEC	0x1C	/* mask to get all above. */
     92 
     93 #endif	/* _KERNEL */
     94 
     95 /* MMU specific segment size */
     96 #define	SEGSHIFT	17	        /* LOG2(NBSG) */
     97 #define	NBSG		(1 << SEGSHIFT)	/* bytes/segment */
     98 #define	SEGOFSET	(NBSG - 1)	/* byte offset into segment */
     99 
    100 #define	sun3_round_seg(x)	((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
    101 #define	sun3_trunc_seg(x)	((vaddr_t)(x) & ~SEGOFSET)
    102 #define	sun3_seg_offset(x)	((vaddr_t)(x) & SEGOFSET)
    103