89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
/*
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* hvm/save.h
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*
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* Structure definitions for HVM state that is held by Xen and must
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* be saved along with the domain's memory and device-model state.
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*
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* Copyright (c) 2007 XenSource Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __XEN_PUBLIC_HVM_SAVE_H__
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#define __XEN_PUBLIC_HVM_SAVE_H__
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/*
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* Structures in this header *must* have the same layout in 32bit
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* and 64bit environments: this means that all fields must be explicitly
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* sized types and aligned to their sizes, and the structs must be
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* a multiple of eight bytes long.
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*
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* Only the state necessary for saving and restoring (i.e. fields
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* that are analogous to actual hardware state) should go in this file.
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* Internal mechanisms should be kept in Xen-private headers.
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*/
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#if !defined(__GNUC__) || defined(__STRICT_ANSI__)
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#error "Anonymous structs/unions are a GNU extension."
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#endif
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/*
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* Each entry is preceded by a descriptor giving its type and length
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*/
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struct hvm_save_descriptor {
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uint16_t typecode; /* Used to demux the various types below */
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uint16_t instance; /* Further demux within a type */
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uint32_t length; /* In bytes, *not* including this descriptor */
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};
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/*
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* Each entry has a datatype associated with it: for example, the CPU state
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* is saved as a HVM_SAVE_TYPE(CPU), which has HVM_SAVE_LENGTH(CPU),
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* and is identified by a descriptor with typecode HVM_SAVE_CODE(CPU).
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* DECLARE_HVM_SAVE_TYPE binds these things together with some type-system
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* ugliness.
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*/
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#define DECLARE_HVM_SAVE_TYPE(_x, _code, _type) \
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struct __HVM_SAVE_TYPE_##_x { _type t; char c[_code]; }
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#define HVM_SAVE_TYPE(_x) typeof (((struct __HVM_SAVE_TYPE_##_x *)(0))->t)
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#define HVM_SAVE_LENGTH(_x) (sizeof (HVM_SAVE_TYPE(_x)))
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#define HVM_SAVE_CODE(_x) (sizeof (((struct __HVM_SAVE_TYPE_##_x *)(0))->c))
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/*
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* The series of save records is teminated by a zero-type, zero-length
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* descriptor.
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*/
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struct hvm_save_end {};
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DECLARE_HVM_SAVE_TYPE(END, 0, struct hvm_save_end);
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#if defined(__i386__) || defined(__x86_64__)
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#include "../arch-x86/hvm/save.h"
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#elif defined(__ia64__)
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#include "../arch-ia64/hvm/save.h"
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#else
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#error "unsupported architecture"
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#endif
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#endif /* __XEN_PUBLIC_HVM_SAVE_H__ */
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