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