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      1 /*	$NetBSD: pmap.h,v 1.28 2020/03/14 14:05:43 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef	_MACHINE_PMAP_H
     30 #define	_MACHINE_PMAP_H
     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 #define	pmap_update(pmap)		__nothing	/* nothing (yet) */
     68 
     69 /* Map a given physical region to a virtual region */
     70 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
     71 
     72 /* Extract the PMEG for a given physical address. */
     73 extern int _pmap_extract_pmeg(pmap_t, vaddr_t);
     74 
     75 static __inline bool
     76 pmap_remove_all(struct pmap *pmap)
     77 {
     78 	/* Nothing. */
     79 	return false;
     80 }
     81 
     82 /*
     83  * Since PTEs also contain type bits, we have to have some way
     84  * to tell pmap_enter `this is an IO page' or `this is not to
     85  * be cached'.  Since physical addresses are always aligned, we
     86  * can do this with the low order bits.
     87  *
     88  * The values below must agree with pte.h such that:
     89  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
     90  */
     91 #define	PMAP_OBMEM	0x00
     92 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
     93 #define	PMAP_MBMEM	0x08	/* etc (sun-2/120) */
     94 #define	PMAP_MBIO	0x0C	/* etc (sun-2/120) */
     95 #define	PMAP_VME0	0x08	/* etc (sun-2/50) */
     96 #define	PMAP_VME8	0x0C	/* etc (sun-2/50) */
     97 #define	PMAP_NC		0x00	/* tells pmap_enter to set PG_NC */
     98 #define	PMAP_SPEC	0x0C	/* mask to get all above. */
     99 
    100 void pmap_procwr(struct proc *, vaddr_t, size_t);
    101 
    102 #endif	/* _KERNEL */
    103 
    104 /* MMU specific segment value */
    105 #define	SEGSHIFT	15	        /* LOG2(NBSG) */
    106 #define	NBSG		(1 << SEGSHIFT)	/* bytes/segment */
    107 #define	SEGOFSET	(NBSG - 1)	/* byte offset into segment */
    108 
    109 #define	sun2_round_seg(x)	((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
    110 #define	sun2_trunc_seg(x)	((vaddr_t)(x) & ~SEGOFSET)
    111 #define	sun2_seg_offset(x)	((vaddr_t)(x) & SEGOFSET)
    112 
    113 #endif	/* _MACHINE_PMAP_H */
    114