x86, hypervisor: add missing <linux/module.h>
[linux-2.6.git] / arch / x86 / kernel / cpu / mshyperv.c
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
9  * the Free Software Foundation; version 2 of the License.
10  *
11  */
12
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <asm/processor.h>
16 #include <asm/hypervisor.h>
17 #include <asm/hyperv.h>
18 #include <asm/mshyperv.h>
19
20 struct ms_hyperv_info ms_hyperv;
21
22 static bool __init ms_hyperv_platform(void)
23 {
24         u32 eax;
25         u32 hyp_signature[3];
26
27         if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
28                 return false;
29
30         cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
31               &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
32
33         return eax >= HYPERV_CPUID_MIN &&
34                 eax <= HYPERV_CPUID_MAX &&
35                 !memcmp("Microsoft Hv", hyp_signature, 12);
36 }
37
38 static void __init ms_hyperv_init_platform(void)
39 {
40         /*
41          * Extract the features and hints
42          */
43         ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
44         ms_hyperv.hints    = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
45
46         printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
47                ms_hyperv.features, ms_hyperv.hints);
48 }
49
50 const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
51         .name                   = "Microsoft HyperV",
52         .detect                 = ms_hyperv_platform,
53         .init_platform          = ms_hyperv_init_platform,
54 };
55 EXPORT_SYMBOL(x86_hyper_ms_hyperv);