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      1 /*	$NetBSD: pmap.h,v 1.37 2020/03/14 14:05:43 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      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 /*
     33  * NetBSD/sh3 pmap:
     34  *	pmap.pm_ptp[512] ... 512 slot of page table page
     35  *	page table page contains 1024 PTEs. (PAGE_SIZE / sizeof(pt_entry_t))
     36  *	va -> [ PTP 10bit | PTOFSET 10bit | PGOFSET 12bit ]
     37  */
     38 
     39 #ifndef _SH3_PMAP_H_
     40 #define	_SH3_PMAP_H_
     41 #include <sys/queue.h>
     42 #include <sh3/pte.h>
     43 
     44 #define	PMAP_NEED_PROCWR
     45 #define	PMAP_STEAL_MEMORY
     46 #define	PMAP_GROWKERNEL
     47 
     48 #define	__PMAP_PTP_N	512	/* # of page table page maps 2GB. */
     49 struct pmap {
     50 	pt_entry_t **pm_ptp;
     51 	int pm_asid;
     52 	int pm_refcnt;
     53 	struct pmap_statistics	pm_stats;	/* pmap statistics */
     54 };
     55 
     56 void pmap_bootstrap(void);
     57 void pmap_procwr(struct proc *, vaddr_t, size_t);
     58 #define	pmap_update(pmap)		((void)0)
     59 #define	pmap_copy(dp,sp,d,l,s)		((void)0)
     60 #define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
     61 #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
     62 
     63 /* ARGSUSED */
     64 static __inline bool
     65 pmap_remove_all(struct pmap *pmap)
     66 {
     67 	/* Nothing. */
     68 	return false;
     69 }
     70 
     71 /*
     72  * pmap_prefer() helps to avoid virtual cache aliases on SH4 CPUs
     73  * which have the virtually-indexed cache.
     74  */
     75 #ifdef SH4
     76 #define PMAP_PREFER(pa, va, sz, td)     pmap_prefer((pa), (va), (td))
     77 void pmap_prefer(vaddr_t, vaddr_t *, int);
     78 #endif /* SH4 */
     79 
     80 #define	PMAP_MAP_POOLPAGE(pa)		SH3_PHYS_TO_P1SEG((pa))
     81 #define	PMAP_UNMAP_POOLPAGE(va)		SH3_P1SEG_TO_PHYS((va))
     82 
     83 /* MD pmap utils. */
     84 pt_entry_t *__pmap_pte_lookup(pmap_t, vaddr_t);
     85 pt_entry_t *__pmap_kpte_lookup(vaddr_t);
     86 bool __pmap_pte_load(pmap_t, vaddr_t, int);
     87 
     88 /* pmap-specific data store in the vm_page structure. */
     89 #define	__HAVE_VM_PAGE_MD
     90 #define	PVH_REFERENCED		1
     91 #define	PVH_MODIFIED		2
     92 
     93 struct pv_entry;
     94 struct vm_page_md {
     95 	SLIST_HEAD(, pv_entry) pvh_head;
     96 	int pvh_flags;
     97 };
     98 
     99 #define	VM_MDPAGE_INIT(pg)						\
    100 do {									\
    101 	struct vm_page_md *pvh = &(pg)->mdpage;				\
    102 	SLIST_INIT(&pvh->pvh_head);					\
    103 	pvh->pvh_flags = 0;						\
    104 } while (/*CONSTCOND*/0)
    105 #endif /* !_SH3_PMAP_H_ */
    106