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 #endif /* _ASM_X86_XEN_HYPERVISOR_H */ 104