sys/arch/xen/include/xen3-public/features.h

   1 /* $NetBSD: features.h,v 1.3 2007/10/17 19:58:30 garbled Exp $ */
   2 /******************************************************************************
   3  * features.h
   4  *
   5  * Feature flags, reported by XENVER_get_features.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to
   9  * deal in the Software without restriction, including without limitation the
  10  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  11  * sell copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  *
  25  * Copyright (c) 2006, Keir Fraser <keir@xensource.com>
  26  */
  27
  28 #ifndef __XEN_PUBLIC_FEATURES_H__
  29 #define __XEN_PUBLIC_FEATURES_H__
  30
  31 /*
  32  * If set, the guest does not need to write-protect its pagetables, and can
  33  * update them via direct writes.
  34  */
  35 #define XENFEAT_writable_page_tables       0
  36
  37 /*
  38  * If set, the guest does not need to write-protect its segment descriptor
  39  * tables, and can update them via direct writes.
  40  */
  41 #define XENFEAT_writable_descriptor_tables 1
  42
  43 /*
  44  * If set, translation between the guest's 'pseudo-physical' address space
  45  * and the host's machine address space are handled by the hypervisor. In this
  46  * mode the guest does not need to perform phys-to/from-machine translations
  47  * when performing page table operations.
  48  */
  49 #define XENFEAT_auto_translated_physmap    2
  50
  51 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
  52 #define XENFEAT_supervisor_mode_kernel     3
  53
  54 /*
  55  * If set, the guest does not need to allocate x86 PAE page directories
  56  * below 4GB. This flag is usually implied by auto_translated_physmap.
  57  */
  58 #define XENFEAT_pae_pgdir_above_4gb        4
  59
  60 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
  61 #define XENFEAT_mmu_pt_update_preserve_ad  5
  62
  63 #define XENFEAT_NR_SUBMAPS 1
  64
  65 #endif /* __XEN_PUBLIC_FEATURES_H__ */
  66
  67 /*
  68  * Local variables:
  69  * mode: C
  70  * c-set-style: "BSD"
  71  * c-basic-offset: 4
  72  * tab-width: 4
  73  * indent-tabs-mode: nil
  74  * End:
  75  */