sys/arch/sun2/include/pmap.h

   1 /*      $NetBSD: pmap.h,v 1.22 2009/12/11 13:56:15 tsutsui 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 #include <sys/simplelock.h>
  33
  34 /*
  35  * Physical map structures exported to the VM code.
  36  * XXX - Does user-level code really see this struct?
  37  */
  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 /* Extract the PMEG for a given physical address. */
  77 extern int _pmap_extract_pmeg(pmap_t, vaddr_t);
  78
  79 static __inline void
  80 pmap_remove_all(struct pmap *pmap)
  81 {
  82         /* Nothing. */
  83 }
  84
  85 /*
  86  * Since PTEs also contain type bits, we have to have some way
  87  * to tell pmap_enter `this is an IO page' or `this is not to
  88  * be cached'.  Since physical addresses are always aligned, we
  89  * can do this with the low order bits.
  90  *
  91  * The values below must agree with pte.h such that:
  92  *      (PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
  93  */
  94 #define PMAP_OBMEM      0x00
  95 #define PMAP_OBIO       0x04    /* tells pmap_enter to use PG_OBIO */
  96 #define PMAP_MBMEM      0x08    /* etc (sun-2/120) */
  97 #define PMAP_MBIO       0x0C    /* etc (sun-2/120) */
  98 #define PMAP_VME0       0x08    /* etc (sun-2/50) */
  99 #define PMAP_VME8       0x0C    /* etc (sun-2/50) */
 100 #define PMAP_NC         0x00    /* tells pmap_enter to set PG_NC */
 101 #define PMAP_SPEC       0x0C    /* mask to get all above. */
 102
 103 void pmap_procwr(struct proc *, vaddr_t, size_t);
 104
 105 #endif  /* _KERNEL */
 106
 107 /* MMU specific segment value */
 108 #define SEGSHIFT        15              /* LOG2(NBSG) */
 109 #define NBSG            (1 << SEGSHIFT) /* bytes/segment */
 110 #define SEGOFSET        (NBSG - 1)      /* byte offset into segment */
 111
 112 #define sun2_round_seg(x)       ((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
 113 #define sun2_trunc_seg(x)       ((vaddr_t)(x) & ~SEGOFSET)
 114 #define sun2_seg_offset(x)      ((vaddr_t)(x) & SEGOFSET)
 115
 116 #endif  /* _MACHINE_PMAP_H */