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/*
* HyperV Detection code.
*
* Copyright (C) 2010, Novell, Inc.
* Author : K. Y. Srinivasan <ksrinivasan@novell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
*/
#include <linux/types.h>
#include <asm/processor.h>
#include <asm/hyperv.h>
#include <asm/mshyperv.h>
int ms_hyperv_platform(void)
{
u32 eax, ebx, ecx, edx;
char hyp_signature[13];
cpuid(1, &eax, &ebx, &ecx, &edx);
if (!(ecx & HYPERV_HYPERVISOR_PRESENT_BIT))
return 0;
cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, &eax, &ebx, &ecx, &edx);
*(u32 *)(hyp_signature + 0) = ebx;
*(u32 *)(hyp_signature + 4) = ecx;
*(u32 *)(hyp_signature + 8) = edx;
if ((eax < HYPERV_CPUID_MIN) || (memcmp("Microsoft Hv", hyp_signature, 12)))
return 0;
return 1;
}
void __cpuinit ms_hyperv_set_feature_bits(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
c->x86_hyper_features = 0;
/*
* Extract the features, recommendations etc.
* The first 9 bits will be used to track hypervisor features.
* The next 6 bits will be used to track the hypervisor
* recommendations.
*/
cpuid(HYPERV_CPUID_FEATURES, &eax, &ebx, &ecx, &edx);
c->x86_hyper_features |= (eax & 0x1ff);
cpuid(HYPERV_CPUID_ENLIGHTMENT_INFO, &eax, &ebx, &ecx, &edx);
c->x86_hyper_features |= ((eax & 0x3f) << 9);
printk(KERN_INFO "Detected HyperV with features: %x\n",
c->x86_hyper_features);
}
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