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
xen_cpuid_base(void)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
xen_initdom_restore_msi(struct pci_dev * dev)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 #ifdef CONFIG_XEN_PVH
66 void __init xen_reserve_extra_memory(struct boot_params *bootp);
67 #else
xen_reserve_extra_memory(struct boot_params * bootp)68 static inline void xen_reserve_extra_memory(struct boot_params *bootp) { }
69 #endif
70 #endif
71
72 /* Lazy mode for batching updates / context switch */
73 enum xen_lazy_mode {
74 XEN_LAZY_NONE,
75 XEN_LAZY_MMU,
76 XEN_LAZY_CPU,
77 };
78
79 DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode);
80 DECLARE_PER_CPU(unsigned int, xen_lazy_nesting);
81
enter_lazy(enum xen_lazy_mode mode)82 static inline void enter_lazy(enum xen_lazy_mode mode)
83 {
84 enum xen_lazy_mode old_mode = this_cpu_read(xen_lazy_mode);
85
86 if (mode == old_mode) {
87 this_cpu_inc(xen_lazy_nesting);
88 return;
89 }
90
91 BUG_ON(old_mode != XEN_LAZY_NONE);
92
93 this_cpu_write(xen_lazy_mode, mode);
94 }
95
leave_lazy(enum xen_lazy_mode mode)96 static inline void leave_lazy(enum xen_lazy_mode mode)
97 {
98 BUG_ON(this_cpu_read(xen_lazy_mode) != mode);
99
100 if (this_cpu_read(xen_lazy_nesting) == 0)
101 this_cpu_write(xen_lazy_mode, XEN_LAZY_NONE);
102 else
103 this_cpu_dec(xen_lazy_nesting);
104 }
105
106 enum xen_lazy_mode xen_get_lazy_mode(void);
107
108 #if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
109 void xen_sanitize_proc_cap_bits(uint32_t *buf);
110 #else
xen_sanitize_proc_cap_bits(uint32_t * buf)111 static inline void xen_sanitize_proc_cap_bits(uint32_t *buf)
112 {
113 BUG();
114 }
115 #endif
116
117 #endif /* _ASM_X86_XEN_HYPERVISOR_H */
118