LXR linux/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
  36extern struct shared_info *HYPERVISOR_shared_info;
  37extern struct start_info *xen_start_info;
  38
  39#include <asm/processor.h>
  40
  41static inline uint32_t xen_cpuid_base(void)
  42{
  43        return hypervisor_cpuid_base("XenVMMXenVMM", 2);
  44}
  45
  46#ifdef CONFIG_XEN
  47extern bool xen_hvm_need_lapic(void);
  48
  49static inline bool xen_x2apic_para_available(void)
  50{
  51        return xen_hvm_need_lapic();
  52}
  53#else
  54static 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 */
  61