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/processor.h> 40 41 static inline uint32_t xen_cpuid_base(void) 42 { 43 return hypervisor_cpuid_base("XenVMMXenVMM", 2); 44 } 45 46 #ifdef CONFIG_XEN 47 extern bool xen_hvm_need_lapic(void); 48 49 static inline bool xen_x2apic_para_available(void) 50 { 51 return xen_hvm_need_lapic(); 52 } 53 #else 54 static inline bool xen_x2apic_para_available(void) 55 { 56 return (xen_cpuid_base() != 0); 57 } 58 #endif 59 60 #endif /* _ASM_X86_XEN_HYPERVISOR_H */ 61