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 __init xen_hvm_need_lapic(void);
48
49 static inline bool __init xen_x2apic_para_available(void)
50 {
51 return xen_hvm_need_lapic();
52 }
53 #else
54 static inline bool __init xen_x2apic_para_available(void)
55 {
56 return (xen_cpuid_base() != 0);
57 }
58 #endif
59
60 #ifdef CONFIG_HOTPLUG_CPU
61 void xen_arch_register_cpu(int num);
62 void xen_arch_unregister_cpu(int num);
63 #endif
64
65 extern void xen_set_iopl_mask(unsigned mask);
66
67 #endif /* _ASM_X86_XEN_HYPERVISOR_H */