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/interface/mem_event.h

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    1 /******************************************************************************
    2  * mem_event.h
    3  *
    4  * Memory event common structures.
    5  *
    6  * Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
    7  *
    8  * Permission is hereby granted, free of charge, to any person obtaining a copy
    9  * of this software and associated documentation files (the "Software"), to
   10  * deal in the Software without restriction, including without limitation the
   11  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   12  * sell copies of the Software, and to permit persons to whom the Software is
   13  * furnished to do so, subject to the following conditions:
   14  *
   15  * The above copyright notice and this permission notice shall be included in
   16  * all copies or substantial portions of the Software.
   17  *
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   24  * DEALINGS IN THE SOFTWARE.
   25  */
   26 
   27 #ifndef _XEN_PUBLIC_MEM_EVENT_H
   28 #define _XEN_PUBLIC_MEM_EVENT_H
   29 
   30 #include "xen.h"
   31 #include "io/ring.h"
   32 
   33 /* Memory event flags */
   34 #define MEM_EVENT_FLAG_VCPU_PAUSED  (1 << 0)
   35 #define MEM_EVENT_FLAG_DROP_PAGE    (1 << 1)
   36 #define MEM_EVENT_FLAG_EVICT_FAIL   (1 << 2)
   37 #define MEM_EVENT_FLAG_FOREIGN      (1 << 3)
   38 #define MEM_EVENT_FLAG_DUMMY        (1 << 4)
   39 
   40 /* Reasons for the memory event request */
   41 #define MEM_EVENT_REASON_UNKNOWN     0    /* typical reason */
   42 #define MEM_EVENT_REASON_VIOLATION   1    /* access violation, GFN is address */
   43 #define MEM_EVENT_REASON_CR0         2    /* CR0 was hit: gfn is CR0 value */
   44 #define MEM_EVENT_REASON_CR3         3    /* CR3 was hit: gfn is CR3 value */
   45 #define MEM_EVENT_REASON_CR4         4    /* CR4 was hit: gfn is CR4 value */
   46 #define MEM_EVENT_REASON_INT3        5    /* int3 was hit: gla/gfn are RIP */
   47 #define MEM_EVENT_REASON_SINGLESTEP  6    /* single step was invoked: gla/gfn are RIP */
   48 
   49 typedef struct mem_event_st {
   50     uint32_t flags;
   51     uint32_t vcpu_id;
   52 
   53     uint64_t gfn;
   54     uint64_t offset;
   55     uint64_t gla; /* if gla_valid */
   56 
   57     uint32_t p2mt;
   58 
   59     uint16_t access_r:1;
   60     uint16_t access_w:1;
   61     uint16_t access_x:1;
   62     uint16_t gla_valid:1;
   63     uint16_t available:12;
   64 
   65     uint16_t reason;
   66 } mem_event_request_t, mem_event_response_t;
   67 
   68 DEFINE_RING_TYPES(mem_event, mem_event_request_t, mem_event_response_t);
   69 
   70 #endif
   71 
   72 /*
   73  * Local variables:
   74  * mode: C
   75  * c-set-style: "BSD"
   76  * c-basic-offset: 4
   77  * tab-width: 4
   78  * indent-tabs-mode: nil
   79  * End:
   80  */

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