sys/arch/sun3/include/pmap3.h

   1 /*      $NetBSD: pmap3.h,v 1.46 2009/12/11 13:52:57 tsutsui 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 /*
  33  * Physical map structures exported to the VM code.
  34  * XXX - Does user-level code really see this struct?
  35  */
  36
  37 #include <sys/simplelock.h>
  38
  39 struct pmap {
  40         unsigned char           *pm_segmap;     /* soft copy of segmap */
  41         int                     pm_ctxnum;      /* MMU context number */
  42         struct simplelock       pm_lock;        /* lock on pmap */
  43         int                     pm_refcount;    /* reference count */
  44         int                     pm_version;
  45 };
  46
  47 #ifdef _KERNEL
  48 /*
  49  * We give the pmap code a chance to resolve faults by
  50  * reloading translations that it was forced to unload.
  51  * This function does that, and calls vm_fault if it
  52  * could not resolve the fault by reloading the MMU.
  53  */
  54 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
  55
  56 /* This lets us have some say in choosing VA locations. */
  57 extern void pmap_prefer(vaddr_t, vaddr_t *);
  58 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap))
  59
  60 /* This needs to be a macro for kern_sysctl.c */
  61 extern segsz_t pmap_resident_pages(pmap_t);
  62 #define pmap_resident_count(pmap)       (pmap_resident_pages(pmap))
  63
  64 /* This needs to be a macro for vm_mmap.c */
  65 extern segsz_t pmap_wired_pages(pmap_t);
  66 #define pmap_wired_count(pmap)  (pmap_wired_pages(pmap))
  67
  68 /* We use the PA plus some low bits for device mmap. */
  69 #define pmap_phys_address(addr)         (addr)
  70
  71 #define pmap_update(pmap)               /* nothing (yet) */
  72
  73 /* Map a given physical region to a virtual region */
  74 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
  75
  76 static __inline void
  77 pmap_remove_all(struct pmap *pmap)
  78 {
  79         /* Nothing. */
  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    /* unused */
  92 #define PMAP_OBIO       0x04    /* tells pmap_enter to use PG_OBIO */
  93 #define PMAP_VME16      0x08    /* etc */
  94 #define PMAP_VME32      0x0C    /* etc */
  95 #define PMAP_NC         0x10    /* tells pmap_enter to set PG_NC */
  96 #define PMAP_SPEC       0x1C    /* mask to get all above. */
  97
  98 #endif  /* _KERNEL */
  99
 100 /* MMU specific segment size */
 101 #define SEGSHIFT        17              /* LOG2(NBSG) */
 102 #define NBSG            (1 << SEGSHIFT) /* bytes/segment */
 103 #define SEGOFSET        (NBSG - 1)      /* byte offset into segment */
 104
 105 #define sun3_round_seg(x)       ((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
 106 #define sun3_trunc_seg(x)       ((vaddr_t)(x) & ~SEGOFSET)
 107 #define sun3_seg_offset(x)      ((vaddr_t)(x) & SEGOFSET)