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 extern struct shared_info *HYPERVISOR_shared_info;
  37 extern struct start_info *xen_start_info;
  38
  39 #include <asm/processor.h>
  40
  41 static inline uint32_t xen_cpuid_base(void)
  42 {
  43         return hypervisor_cpuid_base("XenVMMXenVMM", 2);
  44 }
  45
  46 #ifdef CONFIG_XEN
  47 extern bool xen_hvm_need_lapic(void);
  48
  49 static inline bool xen_x2apic_para_available(void)
  50 {
  51         return xen_hvm_need_lapic();
  52 }
  53 #else
  54 static inline bool xen_x2apic_para_available(void)
  55 {
  56         return (xen_cpuid_base() != 0);
  57 }
  58 #endif
  59
  60 #endif /* _ASM_X86_XEN_HYPERVISOR_H */