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/xen/gnttab.h

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    1 /******************************************************************************
    2  * gnttab.h
    3  * 
    4  * Two sets of functionality:
    5  * 1. Granting foreign access to our memory reservation.
    6  * 2. Accessing others' memory reservations via grant references.
    7  * (i.e., mechanisms for both sender and recipient of grant references)
    8  * 
    9  * Copyright (c) 2004-2005, K A Fraser
   10  * Copyright (c) 2005, Christopher Clark
   11  * 
   12  * This program is free software; you can redistribute it and/or
   13  * modify it under the terms of the GNU General Public License version 2
   14  * as published by the Free Software Foundation; or, when distributed
   15  * separately from the Linux kernel or incorporated into other
   16  * software packages, subject to the following license:
   17  * 
   18  * Permission is hereby granted, free of charge, to any person obtaining a copy
   19  * of this source file (the "Software"), to deal in the Software without
   20  * restriction, including without limitation the rights to use, copy, modify,
   21  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   22  * and to permit persons to whom the Software is furnished to do so, subject to
   23  * the following conditions:
   24  * 
   25  * The above copyright notice and this permission notice shall be included in
   26  * all copies or substantial portions of the Software.
   27  * 
   28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   29  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   30  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   31  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   32  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   33  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   34  * IN THE SOFTWARE.
   35  */
   36 
   37 #ifndef __ASM_GNTTAB_H__
   38 
   39 #include <xen/interface/grant_table.h>
   40 
   41 #include <xen/hypervisor.h>
   42 #include <xen/interface/grant_table.h>
   43 #include <machine/xen/xen-os.h>
   44 #include <xen/features.h>
   45 
   46 struct gnttab_free_callback {
   47         struct gnttab_free_callback *next;
   48         void (*fn)(void *);
   49         void *arg;
   50         uint16_t count;
   51 };
   52 
   53 int gnttab_init(void);
   54 
   55 /*
   56  * Allocate a grant table reference and return it in *result. Returns
   57  * zero on success or errno on error.
   58  */
   59 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
   60     int flags, grant_ref_t *result);
   61 
   62 /*
   63  * End access through the given grant reference, iff the grant entry is no
   64  * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
   65  * use.
   66  */
   67 int gnttab_end_foreign_access_ref(grant_ref_t ref);
   68 
   69 /*
   70  * Eventually end access through the given grant reference, and once that
   71  * access has been ended, free the given page too.  Access will be ended
   72  * immediately iff the grant entry is not in use, otherwise it will happen
   73  * some time later.  page may be 0, in which case no freeing will occur.
   74  */
   75 void gnttab_end_foreign_access(grant_ref_t ref, void *page);
   76 
   77 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn, grant_ref_t *result);
   78 
   79 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
   80 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
   81 
   82 int gnttab_query_foreign_access(grant_ref_t ref);
   83 
   84 /*
   85  * operations on reserved batches of grant references
   86  */
   87 int gnttab_alloc_grant_references(uint16_t count, grant_ref_t *pprivate_head);
   88 
   89 void gnttab_free_grant_reference(grant_ref_t ref);
   90 
   91 void gnttab_free_grant_references(grant_ref_t head);
   92 
   93 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
   94 
   95 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
   96 
   97 void gnttab_release_grant_reference(grant_ref_t *private_head,
   98                                     grant_ref_t release);
   99 
  100 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
  101                                   void (*fn)(void *), void *arg, uint16_t count);
  102 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
  103 
  104 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
  105                                      unsigned long frame, int flags);
  106 
  107 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
  108                                        unsigned long pfn);
  109 
  110 int gnttab_suspend(void);
  111 int gnttab_resume(void);
  112 
  113 #if 0
  114 
  115 #include <xen/features.h>
  116 
  117 static inline void
  118 gnttab_set_map_op(struct gnttab_map_grant_ref *map, vm_paddr_t addr,
  119                   uint32_t flags, grant_ref_t ref, domid_t domid)
  120 {
  121         if (flags & GNTMAP_contains_pte)
  122                 map->host_addr = addr;
  123         else if (xen_feature(XENFEAT_auto_translated_physmap))
  124                 map->host_addr = vtophys(addr);
  125         else
  126                 map->host_addr = addr;
  127 
  128         map->flags = flags;
  129         map->ref = ref;
  130         map->dom = domid;
  131 }
  132 
  133 static inline void
  134 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, vm_paddr_t addr,
  135                     uint32_t flags, grant_handle_t handle)
  136 {
  137         if (flags & GNTMAP_contains_pte)
  138                 unmap->host_addr = addr;
  139         else if (xen_feature(XENFEAT_auto_translated_physmap))
  140                 unmap->host_addr = vtophys(addr);
  141         else
  142                 unmap->host_addr = addr;
  143 
  144         unmap->handle = handle;
  145         unmap->dev_bus_addr = 0;
  146 }
  147 
  148 static inline void
  149 gnttab_set_replace_op(struct gnttab_unmap_and_replace *unmap, vm_paddr_t addr,
  150                       vm_paddr_t new_addr, grant_handle_t handle)
  151 {
  152         if (xen_feature(XENFEAT_auto_translated_physmap)) {
  153                 unmap->host_addr = vtophys(addr);
  154                 unmap->new_addr = vtophys(new_addr);
  155         } else {
  156                 unmap->host_addr = addr;
  157                 unmap->new_addr = new_addr;
  158         }
  159 
  160         unmap->handle = handle;
  161 }
  162 #endif
  163 
  164 #endif /* __ASM_GNTTAB_H__ */

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