The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/xen/xenpmap.h

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    1 /*
    2  *
    3  * Copyright (c) 2004 Christian Limpach.
    4  * Copyright (c) 2004,2005 Kip Macy
    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  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Christian Limpach.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  *
   33  * $FreeBSD: releng/8.2/sys/i386/include/xen/xenpmap.h 190627 2009-04-01 17:06:28Z dfr $
   34  */
   35 
   36 #ifndef _XEN_XENPMAP_H_
   37 #define _XEN_XENPMAP_H_
   38 void _xen_queue_pt_update(vm_paddr_t, vm_paddr_t, char *, int);
   39 void xen_pt_switch(vm_paddr_t);
   40 void xen_set_ldt(vm_paddr_t, unsigned long);
   41 void xen_pgdpt_pin(vm_paddr_t);
   42 void xen_pgd_pin(vm_paddr_t);
   43 void xen_pgd_unpin(vm_paddr_t);
   44 void xen_pt_pin(vm_paddr_t);
   45 void xen_pt_unpin(vm_paddr_t);
   46 void xen_flush_queue(void);
   47 void pmap_ref(pt_entry_t *pte, vm_paddr_t ma);
   48 void pmap_suspend(void);
   49 void pmap_resume(void);
   50 void xen_check_queue(void);
   51 
   52 #ifdef INVARIANTS
   53 #define xen_queue_pt_update(a, b) _xen_queue_pt_update((a), (b), __FILE__, __LINE__)
   54 #else
   55 #define xen_queue_pt_update(a, b) _xen_queue_pt_update((a), (b), NULL, 0)
   56 #endif  
   57 
   58 
   59 #include <sys/param.h>
   60 #include <sys/pcpu.h>
   61 
   62 #ifdef PMAP_DEBUG
   63 #define PMAP_REF pmap_ref
   64 #define PMAP_DEC_REF_PAGE pmap_dec_ref_page
   65 #define PMAP_MARK_PRIV pmap_mark_privileged
   66 #define PMAP_MARK_UNPRIV pmap_mark_unprivileged
   67 #else 
   68 #define PMAP_MARK_PRIV(a)
   69 #define PMAP_MARK_UNPRIV(a)
   70 #define PMAP_REF(a, b)
   71 #define PMAP_DEC_REF_PAGE(a)
   72 #endif
   73 
   74 #define ALWAYS_SYNC 0
   75 
   76 #ifdef PT_DEBUG
   77 #define PT_LOG() printk("WP PT_SET %s:%d\n", __FILE__, __LINE__) 
   78 #else
   79 #define PT_LOG()
   80 #endif
   81 
   82 #define INVALID_P2M_ENTRY       (~0UL)
   83 
   84 #define pmap_valid_entry(E)           ((E) & PG_V) /* is PDE or PTE valid? */
   85 
   86 #define SH_PD_SET_VA        1
   87 #define SH_PD_SET_VA_MA     2
   88 #define SH_PD_SET_VA_CLEAR  3
   89 
   90 struct pmap;
   91 void pd_set(struct pmap *pmap, int ptepindex, vm_paddr_t val, int type);
   92 #ifdef notyet
   93 static vm_paddr_t
   94 vptetomachpte(vm_paddr_t *pte)
   95 {
   96         vm_offset_t offset, ppte;
   97         vm_paddr_t pgoffset, retval, *pdir_shadow_ptr;
   98         int pgindex;
   99 
  100         ppte = (vm_offset_t)pte;
  101         pgoffset = (ppte & PAGE_MASK);
  102         offset = ppte - (vm_offset_t)PTmap;
  103         pgindex = ppte >> PDRSHIFT;
  104 
  105         pdir_shadow_ptr = (vm_paddr_t *)PCPU_GET(pdir_shadow);
  106         retval = (pdir_shadow_ptr[pgindex] & ~PAGE_MASK) + pgoffset;
  107         return (retval);
  108 }
  109 #endif
  110 #define PT_GET(_ptp)                                            \
  111         (pmap_valid_entry(*(_ptp)) ? xpmap_mtop(*(_ptp)) : (0))
  112 
  113 #ifdef WRITABLE_PAGETABLES
  114 
  115 #define PT_SET_VA(_ptp,_npte,sync) do {                         \
  116         PMAP_REF((_ptp), xpmap_ptom(_npte));                    \
  117         PT_LOG();                                               \
  118         *(_ptp) = xpmap_ptom((_npte));                          \
  119 } while (/*CONSTCOND*/0)
  120 #define PT_SET_VA_MA(_ptp,_npte,sync) do {                      \
  121         PMAP_REF((_ptp), (_npte));                              \
  122         PT_LOG();                                               \
  123         *(_ptp) = (_npte);                                      \
  124 } while (/*CONSTCOND*/0)
  125 #define PT_CLEAR_VA(_ptp, sync) do {                            \
  126         PMAP_REF((pt_entry_t *)(_ptp), 0);                      \
  127         PT_LOG();                                               \
  128         *(_ptp) = 0;                                            \
  129 } while (/*CONSTCOND*/0)
  130 
  131 #define PD_SET_VA(_pmap, _ptp, _npte, sync) do {                \
  132         PMAP_REF((_ptp), xpmap_ptom(_npte));                    \
  133         pd_set((_pmap),(_ptp),(_npte), SH_PD_SET_VA);           \
  134         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  135 } while (/*CONSTCOND*/0)
  136 #define PD_SET_VA_MA(_pmap, _ptp, _npte, sync) do {             \
  137         PMAP_REF((_ptp), (_npte));                              \
  138         pd_set((_pmap),(_ptp),(_npte), SH_PD_SET_VA_MA);        \
  139         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  140 } while (/*CONSTCOND*/0)
  141 #define PD_CLEAR_VA(_pmap, _ptp, sync) do {                     \
  142         PMAP_REF((pt_entry_t *)(_ptp), 0);                      \
  143         pd_set((_pmap),(_ptp), 0, SH_PD_SET_VA_CLEAR);          \
  144         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  145 } while (/*CONSTCOND*/0)
  146 
  147 #else /* !WRITABLE_PAGETABLES */
  148 
  149 #define PT_SET_VA(_ptp,_npte,sync) do {                         \
  150         PMAP_REF((_ptp), xpmap_ptom(_npte));                    \
  151         xen_queue_pt_update(vtomach(_ptp),              \
  152                             xpmap_ptom(_npte));                 \
  153         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  154 } while (/*CONSTCOND*/0)
  155 #define PT_SET_VA_MA(_ptp,_npte,sync) do {                      \
  156         PMAP_REF((_ptp), (_npte));                              \
  157         xen_queue_pt_update(vtomach(_ptp), _npte);        \
  158         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  159 } while (/*CONSTCOND*/0)
  160 #define PT_CLEAR_VA(_ptp, sync) do {                            \
  161         PMAP_REF((pt_entry_t *)(_ptp), 0);                      \
  162         xen_queue_pt_update(vtomach(_ptp), 0);            \
  163         if (sync || ALWAYS_SYNC)                                \
  164                 xen_flush_queue();                              \
  165 } while (/*CONSTCOND*/0)
  166 
  167 #define PD_SET_VA(_pmap, _ptepindex,_npte,sync) do {            \
  168         PMAP_REF((_ptp), xpmap_ptom(_npte));                    \
  169         pd_set((_pmap),(_ptepindex),(_npte), SH_PD_SET_VA);     \
  170         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  171 } while (/*CONSTCOND*/0)
  172 #define PD_SET_VA_MA(_pmap, _ptepindex,_npte,sync) do {         \
  173         PMAP_REF((_ptp), (_npte));                              \
  174         pd_set((_pmap),(_ptepindex),(_npte), SH_PD_SET_VA_MA);  \
  175         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  176 } while (/*CONSTCOND*/0)
  177 #define PD_CLEAR_VA(_pmap, _ptepindex, sync) do {               \
  178         PMAP_REF((pt_entry_t *)(_ptp), 0);                      \
  179         pd_set((_pmap),(_ptepindex), 0, SH_PD_SET_VA_CLEAR);    \
  180         if (sync || ALWAYS_SYNC) xen_flush_queue();             \
  181 } while (/*CONSTCOND*/0)
  182 
  183 #endif
  184 
  185 #define PT_SET_MA(_va, _ma)                                     \
  186 do {                                                            \
  187    PANIC_IF(HYPERVISOR_update_va_mapping(((unsigned long)(_va)),\
  188            (_ma),                                               \
  189            UVMF_INVLPG| UVMF_ALL) < 0);                 \
  190 } while (/*CONSTCOND*/0)          
  191 
  192 #define PT_UPDATES_FLUSH() do {                                 \
  193         xen_flush_queue();                                      \
  194 } while (/*CONSTCOND*/0)
  195 
  196 static __inline vm_paddr_t
  197 xpmap_mtop(vm_paddr_t mpa)
  198 {
  199         vm_paddr_t tmp = (mpa & PG_FRAME);
  200         
  201         return machtophys(tmp) | (mpa & ~PG_FRAME);
  202 }
  203 
  204 static __inline vm_paddr_t
  205 xpmap_ptom(vm_paddr_t ppa)
  206 {
  207         vm_paddr_t tmp = (ppa & PG_FRAME);
  208 
  209         return phystomach(tmp) | (ppa & ~PG_FRAME);
  210 }
  211 
  212 static __inline void
  213 set_phys_to_machine(unsigned long pfn, unsigned long mfn)
  214 {
  215 #ifdef notyet   
  216         PANIC_IF(max_mapnr && pfn >= max_mapnr);
  217 #endif  
  218         if (xen_feature(XENFEAT_auto_translated_physmap)) {
  219 #ifdef notyet           
  220                 PANIC_IF((pfn != mfn && mfn != INVALID_P2M_ENTRY));
  221 #endif          
  222                 return;
  223         }
  224         xen_phys_machine[pfn] = mfn;
  225 }
  226 
  227 static __inline int
  228 phys_to_machine_mapping_valid(unsigned long pfn)
  229 {
  230         return xen_phys_machine[pfn] != INVALID_P2M_ENTRY;
  231 }
  232 
  233 
  234 #endif /* _XEN_XENPMAP_H_ */

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