1 /******************************************************************************
4 * Linux-specific hypervisor handling.
6 * Copyright (c) 2002-2004, K A Fraser
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:
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:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
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
33 #ifndef _ASM_X86_XEN_HYPERVISOR_H
34 #define _ASM_X86_XEN_HYPERVISOR_H
36 extern struct shared_info *HYPERVISOR_shared_info;
37 extern struct start_info *xen_start_info;
40 #include <asm/processor.h>
42 #define XEN_SIGNATURE "XenVMMXenVMM"
44 static inline uint32_t xen_cpuid_base(void)
46 return hypervisor_cpuid_base(XEN_SIGNATURE, 2);
51 #ifdef CONFIG_XEN_PV_DOM0
52 bool xen_initdom_restore_msi(struct pci_dev *dev);
54 static inline bool xen_initdom_restore_msi(struct pci_dev *dev) { return true; }
57 #ifdef CONFIG_HOTPLUG_CPU
58 void xen_arch_register_cpu(int num);
59 void xen_arch_unregister_cpu(int num);
63 void __init xen_pvh_init(struct boot_params *boot_params);
64 void __init mem_map_via_hcall(struct boot_params *boot_params_p);
67 /* Lazy mode for batching updates / context switch */
74 DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode);
75 DECLARE_PER_CPU(unsigned int, xen_lazy_nesting);
77 static inline void enter_lazy(enum xen_lazy_mode mode)
79 enum xen_lazy_mode old_mode = this_cpu_read(xen_lazy_mode);
81 if (mode == old_mode) {
82 this_cpu_inc(xen_lazy_nesting);
86 BUG_ON(old_mode != XEN_LAZY_NONE);
88 this_cpu_write(xen_lazy_mode, mode);
91 static inline void leave_lazy(enum xen_lazy_mode mode)
93 BUG_ON(this_cpu_read(xen_lazy_mode) != mode);
95 if (this_cpu_read(xen_lazy_nesting) == 0)
96 this_cpu_write(xen_lazy_mode, XEN_LAZY_NONE);
98 this_cpu_dec(xen_lazy_nesting);
101 enum xen_lazy_mode xen_get_lazy_mode(void);
103 #if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
104 void xen_sanitize_proc_cap_bits(uint32_t *buf);
106 static inline void xen_sanitize_proc_cap_bits(uint32_t *buf)
112 #endif /* _ASM_X86_XEN_HYPERVISOR_H */