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/bug.h>
40 #include <asm/processor.h>
41
42 #define XEN_SIGNATURE "XenVMMXenVMM"
43
44 static inline uint32_t xen_cpuid_base(void)
45 {
46 return hypervisor_cpuid_base(XEN_SIGNATURE, 2);
47 }
48
49 struct pci_dev;
50
51 #ifdef CONFIG_XEN_PV_DOM0
52 bool xen_initdom_restore_msi(struct pci_dev *dev);
53 #else
54 static inline bool xen_initdom_restore_msi(struct pci_dev *dev) { return true; }
55 #endif
56
57 #ifdef CONFIG_HOTPLUG_CPU
58 void xen_arch_register_cpu(int num);
59 void xen_arch_unregister_cpu(int num);
60 #endif
61
62 #ifdef CONFIG_PVH
63 void __init xen_pvh_init(struct boot_params *boot_params);
64 void __init mem_map_via_hcall(struct boot_params *boot_params_p);
65 #endif
66
67 /* Lazy mode for batching updates / context switch */
68 enum xen_lazy_mode {
69 XEN_LAZY_NONE,
70 XEN_LAZY_MMU,
71 XEN_LAZY_CPU,
72 };
73
74 DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode);
75 DECLARE_PER_CPU(unsigned int, xen_lazy_nesting);
76
77 static inline void enter_lazy(enum xen_lazy_mode mode)
78 {
79 enum xen_lazy_mode old_mode = this_cpu_read(xen_lazy_mode);
80
81 if (mode == old_mode) {
82 this_cpu_inc(xen_lazy_nesting);
83 return;
84 }
85
86 BUG_ON(old_mode != XEN_LAZY_NONE);
87
88 this_cpu_write(xen_lazy_mode, mode);
89 }
90
91 static inline void leave_lazy(enum xen_lazy_mode mode)
92 {
93 BUG_ON(this_cpu_read(xen_lazy_mode) != mode);
94
95 if (this_cpu_read(xen_lazy_nesting) == 0)
96 this_cpu_write(xen_lazy_mode, XEN_LAZY_NONE);
97 else
98 this_cpu_dec(xen_lazy_nesting);
99 }
100
101 enum xen_lazy_mode xen_get_lazy_mode(void);
102
103 #if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
104 void xen_sanitize_proc_cap_bits(uint32_t *buf);
105 #else
106 static inline void xen_sanitize_proc_cap_bits(uint32_t *buf)
107 {
108 BUG();
109 }
110 #endif
111
112 #endif /* _ASM_X86_XEN_HYPERVISOR_H */
113
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