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/hvm/save.h

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    1 /* 
    2  * hvm/save.h
    3  *
    4  * Structure definitions for HVM state that is held by Xen and must
    5  * be saved along with the domain's memory and device-model state.
    6  * 
    7  * Copyright (c) 2007 XenSource Ltd.
    8  *
    9  * Permission is hereby granted, free of charge, to any person obtaining a copy
   10  * of this software and associated documentation files (the "Software"), to
   11  * deal in the Software without restriction, including without limitation the
   12  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   13  * sell copies of the Software, and to permit persons to whom the Software is
   14  * furnished to do so, subject to the following conditions:
   15  *
   16  * The above copyright notice and this permission notice shall be included in
   17  * all copies or substantial portions of the Software.
   18  *
   19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   24  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   25  * DEALINGS IN THE SOFTWARE.
   26  */
   27 
   28 #ifndef __XEN_PUBLIC_HVM_SAVE_H__
   29 #define __XEN_PUBLIC_HVM_SAVE_H__
   30 
   31 /*
   32  * Structures in this header *must* have the same layout in 32bit 
   33  * and 64bit environments: this means that all fields must be explicitly 
   34  * sized types and aligned to their sizes, and the structs must be 
   35  * a multiple of eight bytes long.
   36  *
   37  * Only the state necessary for saving and restoring (i.e. fields 
   38  * that are analogous to actual hardware state) should go in this file. 
   39  * Internal mechanisms should be kept in Xen-private headers.
   40  */
   41 
   42 #if !defined(__GNUC__) || defined(__STRICT_ANSI__)
   43 #error "Anonymous structs/unions are a GNU extension."
   44 #endif
   45 
   46 /* 
   47  * Each entry is preceded by a descriptor giving its type and length
   48  */
   49 struct hvm_save_descriptor {
   50     uint16_t typecode;          /* Used to demux the various types below */
   51     uint16_t instance;          /* Further demux within a type */
   52     uint32_t length;            /* In bytes, *not* including this descriptor */
   53 };
   54 
   55 
   56 /* 
   57  * Each entry has a datatype associated with it: for example, the CPU state 
   58  * is saved as a HVM_SAVE_TYPE(CPU), which has HVM_SAVE_LENGTH(CPU), 
   59  * and is identified by a descriptor with typecode HVM_SAVE_CODE(CPU).
   60  * DECLARE_HVM_SAVE_TYPE binds these things together with some type-system
   61  * ugliness.
   62  */
   63 
   64 #ifdef __XEN__
   65 # define DECLARE_HVM_SAVE_TYPE_COMPAT(_x, _code, _type, _ctype, _fix)     \
   66     static inline int __HVM_SAVE_FIX_COMPAT_##_x(void *h) { return _fix(h); } \
   67     struct __HVM_SAVE_TYPE_##_x { _type t; char c[_code]; char cpt[2];}; \
   68     struct __HVM_SAVE_TYPE_COMPAT_##_x { _ctype t; }                   
   69 
   70 # include <xen/lib.h> /* BUG() */
   71 # define DECLARE_HVM_SAVE_TYPE(_x, _code, _type)                         \
   72     static inline int __HVM_SAVE_FIX_COMPAT_##_x(void *h) { BUG(); return -1; } \
   73     struct __HVM_SAVE_TYPE_##_x { _type t; char c[_code]; char cpt[1];}; \
   74     struct __HVM_SAVE_TYPE_COMPAT_##_x { _type t; }                   
   75 #else
   76 # define DECLARE_HVM_SAVE_TYPE_COMPAT(_x, _code, _type, _ctype, _fix)     \
   77     struct __HVM_SAVE_TYPE_##_x { _type t; char c[_code]; char cpt[2];} 
   78 
   79 # define DECLARE_HVM_SAVE_TYPE(_x, _code, _type)                         \
   80     struct __HVM_SAVE_TYPE_##_x { _type t; char c[_code]; char cpt[1];} 
   81 #endif
   82 
   83 #define HVM_SAVE_TYPE(_x) typeof (((struct __HVM_SAVE_TYPE_##_x *)(0))->t)
   84 #define HVM_SAVE_LENGTH(_x) (sizeof (HVM_SAVE_TYPE(_x)))
   85 #define HVM_SAVE_CODE(_x) (sizeof (((struct __HVM_SAVE_TYPE_##_x *)(0))->c))
   86 
   87 #ifdef __XEN__
   88 # define HVM_SAVE_TYPE_COMPAT(_x) typeof (((struct __HVM_SAVE_TYPE_COMPAT_##_x *)(0))->t)
   89 # define HVM_SAVE_LENGTH_COMPAT(_x) (sizeof (HVM_SAVE_TYPE_COMPAT(_x)))
   90 
   91 # define HVM_SAVE_HAS_COMPAT(_x) (sizeof (((struct __HVM_SAVE_TYPE_##_x *)(0))->cpt)-1)
   92 # define HVM_SAVE_FIX_COMPAT(_x, _dst) __HVM_SAVE_FIX_COMPAT_##_x(_dst)
   93 #endif
   94 
   95 /* 
   96  * The series of save records is teminated by a zero-type, zero-length 
   97  * descriptor.
   98  */
   99 
  100 struct hvm_save_end {};
  101 DECLARE_HVM_SAVE_TYPE(END, 0, struct hvm_save_end);
  102 
  103 #if defined(__i386__) || defined(__x86_64__)
  104 #include "../arch-x86/hvm/save.h"
  105 #elif defined(__ia64__)
  106 #include "../arch-ia64/hvm/save.h"
  107 #elif defined(__arm__)
  108 #include "../arch-arm/hvm/save.h"
  109 #else
  110 #error "unsupported architecture"
  111 #endif
  112 
  113 #endif /* __XEN_PUBLIC_HVM_SAVE_H__ */

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