mirror of https://gitee.com/openkylin/linux.git
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/******************************************************************************
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* hypervisor.h
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*
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* Linux-specific hypervisor handling.
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*
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* Copyright (c) 2002-2004, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef _ASM_X86_XEN_HYPERVISOR_H
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#define _ASM_X86_XEN_HYPERVISOR_H
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/* arch/i386/kernel/setup.c */
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extern struct shared_info *HYPERVISOR_shared_info;
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extern struct start_info *xen_start_info;
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#include <asm/processor.h>
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static inline uint32_t xen_cpuid_base(void)
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{
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uint32_t base, eax, ebx, ecx, edx;
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char signature[13];
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for (base = 0x40000000; base < 0x40010000; base += 0x100) {
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cpuid(base, &eax, &ebx, &ecx, &edx);
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*(uint32_t *)(signature + 0) = ebx;
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*(uint32_t *)(signature + 4) = ecx;
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*(uint32_t *)(signature + 8) = edx;
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signature[12] = 0;
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if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
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return base;
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}
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return 0;
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}
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#ifdef CONFIG_XEN
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extern bool xen_hvm_need_lapic(void);
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static inline bool xen_x2apic_para_available(void)
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{
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return xen_hvm_need_lapic();
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}
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#else
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static inline bool xen_x2apic_para_available(void)
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{
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return (xen_cpuid_base() != 0);
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}
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#endif
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#endif /* _ASM_X86_XEN_HYPERVISOR_H */
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