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 #define __ASM_GNTTAB_H__
   39 
   40 #include <xen/xen-os.h>
   41 #include <xen/hypervisor.h>
   42 #include <xen/features.h>
   43 
   44 #include <xen/interface/grant_table.h>
   45 
   46 #define GNTTAB_LIST_END GRANT_REF_INVALID
   47 
   48 struct gnttab_free_callback {
   49         struct gnttab_free_callback *next;
   50         void (*fn)(void *);
   51         void *arg;
   52         uint16_t count;
   53 };
   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 /*
   78  * Eventually end access through the given array of grant references.
   79  * Access will be ended immediately iff the grant entry is not in use,
   80  * otherwise it will happen some time later
   81  */
   82 void gnttab_end_foreign_access_references(u_int count, grant_ref_t *refs);
   83 
   84 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn, grant_ref_t *result);
   85 
   86 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
   87 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
   88 
   89 int gnttab_query_foreign_access(grant_ref_t ref);
   90 
   91 /*
   92  * operations on reserved batches of grant references
   93  */
   94 int gnttab_alloc_grant_references(uint16_t count, grant_ref_t *pprivate_head);
   95 
   96 void gnttab_free_grant_reference(grant_ref_t ref);
   97 
   98 void gnttab_free_grant_references(grant_ref_t head);
   99 
  100 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
  101 
  102 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
  103 
  104 void gnttab_release_grant_reference(grant_ref_t *private_head,
  105                                     grant_ref_t release);
  106 
  107 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
  108                                   void (*fn)(void *), void *arg, uint16_t count);
  109 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
  110 
  111 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
  112                                      unsigned long frame, int flags);
  113 
  114 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
  115                                        unsigned long pfn);
  116 
  117 int gnttab_suspend(void);
  118 int gnttab_resume(device_t);
  119 
  120 #endif /* __ASM_GNTTAB_H__ */

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