moea64_if.m

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    1 #-
    2 # Copyright (c) 2010 Nathan Whitehorn
    3 # All rights reserved.
    4 #
    5 # Redistribution and use in source and binary forms, with or without
    6 # modification, are permitted provided that the following conditions
    7 # are met:
    8 # 1. Redistributions of source code must retain the above copyright
    9 #    notice, this list of conditions and the following disclaimer.
   10 # 2. Redistributions in binary form must reproduce the above copyright
   11 #    notice, this list of conditions and the following disclaimer in the
   12 #    documentation and/or other materials provided with the distribution.
   13 #
   14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24 # SUCH DAMAGE.
   25 #
   26 # $FreeBSD$
   27 #
   28 
   29 
   30 #include <sys/param.h>
   31 #include <sys/lock.h>
   32 #include <sys/mutex.h>
   33 #include <sys/systm.h>
   34         
   35 #include <vm/vm.h>
   36 #include <vm/vm_page.h>
   37 
   38 #include <machine/mmuvar.h>
   39 
   40 /**
   41  * MOEA64 kobj methods for 64-bit Book-S page table
   42  * manipulation routines used, for example, by hypervisors.
   43  */
   44 
   45 INTERFACE moea64;
   46 
   47 
   48 /**
   49  * Copy ref/changed bits from PTE referenced by _pt_cookie to _pvo_pt.
   50  */
   51 METHOD void pte_synch {
   52         mmu_t           _mmu;
   53         uintptr_t       _pt_cookie;
   54         struct lpte     *_pvo_pt;
   55 };
   56 
   57 /**
   58  * Clear bits ptebit (a mask) from the low word of the PTE referenced by
   59  * _pt_cookie. Note that _pvo_pt is for reference use only -- the bit should
   60  * NOT be cleared there.
   61  */
   62 METHOD void pte_clear {
   63         mmu_t           _mmu;
   64         uintptr_t       _pt_cookie;
   65         struct lpte     *_pvo_pt;
   66         uint64_t        _vpn;
   67         uint64_t        _ptebit;
   68 };
   69 
   70 /**
   71  * Invalidate the PTE referenced by _pt_cookie, synchronizing its validity
   72  * and ref/changed bits after completion.
   73  */
   74 METHOD void pte_unset {
   75         mmu_t           _mmu;
   76         uintptr_t       _pt_cookie;
   77         struct lpte     *_pvo_pt;
   78         uint64_t        _vpn;
   79 };
   80 
   81 /**
   82  * Update the PTE referenced by _pt_cookie with the values in _pvo_pt,
   83  * making sure that the values of ref/changed bits are preserved and
   84  * synchronized back to _pvo_pt.
   85  */
   86 METHOD void pte_change {
   87         mmu_t           _mmu;
   88         uintptr_t       _pt_cookie;
   89         struct lpte     *_pvo_pt;
   90         uint64_t        _vpn;
   91 };
   92         
   93 
   94 /**
   95  * Insert the PTE _pvo_pt into the PTEG group _ptegidx, returning the index
   96  * of the PTE in its group at completion, or -1 if no slots were free. Must
   97  * not replace PTEs marked LPTE_WIRED or LPTE_LOCKED, and must set LPTE_HID
   98  * and LPTE_VALID appropriately in _pvo_pt.
   99  */
  100 METHOD int pte_insert {
  101         mmu_t           _mmu;
  102         u_int           _ptegidx;
  103         struct lpte     *_pvo_pt;
  104 };
  105 
  106 /**
  107  * Return the page table reference cookie corresponding to _pvo, or -1 if
  108  * the _pvo is not currently in the page table.
  109  */
  110 METHOD uintptr_t pvo_to_pte {
  111         mmu_t           _mmu;
  112         const struct pvo_entry *_pvo;
  113 };
  114 
  115

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