arch/x86/include/asm/xen/hypervisor.h

   1 /******************************************************************************
   2  * hypervisor.h
   3  *
   4  * Linux-specific hypervisor handling.
   5  *
   6  * Copyright (c) 2002-2004, K A Fraser
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation; or, when distributed
  11  * separately from the Linux kernel or incorporated into other
  12  * software packages, subject to the following license:
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this source file (the "Software"), to deal in the Software without
  16  * restriction, including without limitation the rights to use, copy, modify,
  17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  18  * and to permit persons to whom the Software is furnished to do so, subject to
  19  * the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  30  * IN THE SOFTWARE.
  31  */
  32
  33 #ifndef _ASM_X86_XEN_HYPERVISOR_H
  34 #define _ASM_X86_XEN_HYPERVISOR_H
  35
  36 /* arch/i386/kernel/setup.c */
  37 extern struct shared_info *HYPERVISOR_shared_info;
  38 extern struct start_info *xen_start_info;
  39
  40 enum xen_domain_type {
  41         XEN_NATIVE,             /* running on bare hardware    */
  42         XEN_PV_DOMAIN,          /* running in a PV domain      */
  43         XEN_HVM_DOMAIN,         /* running in a Xen hvm domain */
  44 };
  45
  46 #ifdef CONFIG_XEN
  47 extern enum xen_domain_type xen_domain_type;
  48 #else
  49 #define xen_domain_type         XEN_NATIVE
  50 #endif
  51
  52 #define xen_domain()            (xen_domain_type != XEN_NATIVE)
  53 #define xen_pv_domain()         (xen_domain() &&                        \
  54                                  xen_domain_type == XEN_PV_DOMAIN)
  55 #define xen_hvm_domain()        (xen_domain() &&                        \
  56                                  xen_domain_type == XEN_HVM_DOMAIN)
  57
  58 #ifdef CONFIG_XEN_DOM0
  59 #include <xen/interface/xen.h>
  60
  61 #define xen_initial_domain()    (xen_pv_domain() && \
  62                                  xen_start_info->flags & SIF_INITDOMAIN)
  63 #else  /* !CONFIG_XEN_DOM0 */
  64 #define xen_initial_domain()    (0)
  65 #endif  /* CONFIG_XEN_DOM0 */
  66
  67 #endif /* _ASM_X86_XEN_HYPERVISOR_H */