features.h

xen 3.2.2 源码

/******************************************************************************
 * features.h
 * 
 * Feature flags, reported by XENVER_get_features.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Copyright (c) 2006, Keir Fraser <[e-mail]>
 */

#ifndef __XEN_PUBLIC_FEATURES_H__
#define __XEN_PUBLIC_FEATURES_H__

/*
 * If set, the guest does not need to write-protect its pagetables, and can
 * update them via direct writes.
 */
#define XENFEAT_writable_page_tables       0

/*
 * If set, the guest does not need to write-protect its segment descriptor
 * tables, and can update them via direct writes.
 */
#define XENFEAT_writable_descriptor_tables 1

/*
 * If set, translation between the guest's 'pseudo-physical' address space
 * and the host's machine address space are handled by the hypervisor. In this
 * mode the guest does not need to perform phys-to/from-machine translations
 * when performing page table operations.
 */
#define XENFEAT_auto_translated_physmap    2

/* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
#define XENFEAT_supervisor_mode_kernel     3

/*
 * If set, the guest does not need to allocate x86 PAE page directories
 * below 4GB. This flag is usually implied by auto_translated_physmap.
 */
#define XENFEAT_pae_pgdir_above_4gb        4

#define XENFEAT_NR_SUBMAPS 1

#endif /* __XEN_PUBLIC_FEATURES_H__ */

/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */