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/bug.h>
40#include <asm/processor.h>
41
42#define XEN_SIGNATURE "XenVMMXenVMM"
43
44static inline uint32_t xen_cpuid_base(void)
45{
46	return hypervisor_cpuid_base(XEN_SIGNATURE, 2);
47}
48
49struct pci_dev;
50
51#ifdef CONFIG_XEN_PV_DOM0
52bool xen_initdom_restore_msi(struct pci_dev *dev);
53#else
54static inline bool xen_initdom_restore_msi(struct pci_dev *dev) { return true; }
55#endif
56
57#ifdef CONFIG_HOTPLUG_CPU
58void xen_arch_register_cpu(int num);
59void xen_arch_unregister_cpu(int num);
60#endif
61
62#ifdef CONFIG_PVH
63void __init xen_pvh_init(struct boot_params *boot_params);
64void __init mem_map_via_hcall(struct boot_params *boot_params_p);
65#endif
66
67/* Lazy mode for batching updates / context switch */
68enum xen_lazy_mode {
69	XEN_LAZY_NONE,
70	XEN_LAZY_MMU,
71	XEN_LAZY_CPU,
72};
73
74DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode);
75DECLARE_PER_CPU(unsigned int, xen_lazy_nesting);
76
77static 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
91static 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
101enum xen_lazy_mode xen_get_lazy_mode(void);
102
103#if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
104void xen_sanitize_proc_cap_bits(uint32_t *buf);
105#else
106static 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