68 lines
2 KiB
C
68 lines
2 KiB
C
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/*
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* HyperV Detection code.
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*
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* Copyright (C) 2010, Novell, Inc.
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* Author : K. Y. Srinivasan <ksrinivasan@novell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/types.h>
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#include <asm/processor.h>
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#include <asm/hyperv.h>
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#include <asm/mshyperv.h>
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int ms_hyperv_platform(void)
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{
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u32 eax, ebx, ecx, edx;
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char hyp_signature[13];
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cpuid(1, &eax, &ebx, &ecx, &edx);
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if (!(ecx & HYPERV_HYPERVISOR_PRESENT_BIT))
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return 0;
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cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, &eax, &ebx, &ecx, &edx);
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*(u32 *)(hyp_signature + 0) = ebx;
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*(u32 *)(hyp_signature + 4) = ecx;
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*(u32 *)(hyp_signature + 8) = edx;
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if ((eax < HYPERV_CPUID_MIN) || (memcmp("Microsoft Hv", hyp_signature, 12)))
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return 0;
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return 1;
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}
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void __cpuinit ms_hyperv_set_feature_bits(struct cpuinfo_x86 *c)
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{
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u32 eax, ebx, ecx, edx;
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c->x86_hyper_features = 0;
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/*
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* Extract the features, recommendations etc.
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* The first 9 bits will be used to track hypervisor features.
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* The next 6 bits will be used to track the hypervisor
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* recommendations.
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*/
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cpuid(HYPERV_CPUID_FEATURES, &eax, &ebx, &ecx, &edx);
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c->x86_hyper_features |= (eax & 0x1ff);
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cpuid(HYPERV_CPUID_ENLIGHTMENT_INFO, &eax, &ebx, &ecx, &edx);
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c->x86_hyper_features |= ((eax & 0x3f) << 9);
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printk(KERN_INFO "Detected HyperV with features: %x\n",
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c->x86_hyper_features);
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}
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