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a2a47c6c KS |
1 | /* |
2 | * HyperV Detection code. | |
3 | * | |
4 | * Copyright (C) 2010, Novell, Inc. | |
5 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9fa02317 | 9 | * the Free Software Foundation; version 2 of the License. |
a2a47c6c KS |
10 | * |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
3998d095 | 14 | #include <linux/module.h> |
a2a47c6c | 15 | #include <asm/processor.h> |
e08cae41 | 16 | #include <asm/hypervisor.h> |
a2a47c6c KS |
17 | #include <asm/hyperv.h> |
18 | #include <asm/mshyperv.h> | |
19 | ||
e08cae41 | 20 | struct ms_hyperv_info ms_hyperv; |
9279aa55 | 21 | EXPORT_SYMBOL_GPL(ms_hyperv); |
a2a47c6c | 22 | |
e08cae41 | 23 | static bool __init ms_hyperv_platform(void) |
a2a47c6c | 24 | { |
e08cae41 PA |
25 | u32 eax; |
26 | u32 hyp_signature[3]; | |
a2a47c6c | 27 | |
e08cae41 PA |
28 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
29 | return false; | |
a2a47c6c | 30 | |
e08cae41 PA |
31 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
32 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 33 | |
e08cae41 PA |
34 | return eax >= HYPERV_CPUID_MIN && |
35 | eax <= HYPERV_CPUID_MAX && | |
36 | !memcmp("Microsoft Hv", hyp_signature, 12); | |
a2a47c6c KS |
37 | } |
38 | ||
e08cae41 | 39 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 40 | { |
a2a47c6c | 41 | /* |
e08cae41 | 42 | * Extract the features and hints |
a2a47c6c | 43 | */ |
e08cae41 PA |
44 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
45 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); | |
a2a47c6c | 46 | |
e08cae41 PA |
47 | printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", |
48 | ms_hyperv.features, ms_hyperv.hints); | |
a2a47c6c | 49 | } |
e08cae41 PA |
50 | |
51 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
52 | .name = "Microsoft HyperV", | |
53 | .detect = ms_hyperv_platform, | |
54 | .init_platform = ms_hyperv_init_platform, | |
55 | }; | |
96f6e775 | 56 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |