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/time.h>
15#include <linux/clocksource.h>
16#include <linux/module.h>
17#include <asm/processor.h>
18#include <asm/hypervisor.h>
19#include <asm/hyperv.h>
20#include <asm/mshyperv.h>
21
22struct ms_hyperv_info ms_hyperv;
23EXPORT_SYMBOL_GPL(ms_hyperv);
24
25static bool __init ms_hyperv_platform(void)
26{
27	u32 eax;
28	u32 hyp_signature[3];
29
30	if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
31		return false;
32
33	cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
34	      &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
35
36	return eax >= HYPERV_CPUID_MIN &&
37		eax <= HYPERV_CPUID_MAX &&
38		!memcmp("Microsoft Hv", hyp_signature, 12);
39}
40
41static cycle_t read_hv_clock(struct clocksource *arg)
42{
43	cycle_t current_tick;
44	/*
45	 * Read the partition counter to get the current tick count. This count
46	 * is set to 0 when the partition is created and is incremented in
47	 * 100 nanosecond units.
48	 */
49	rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
50	return current_tick;
51}
52
53static struct clocksource hyperv_cs = {
54	.name		= "hyperv_clocksource",
55	.rating		= 400, /* use this when running on Hyperv*/
56	.read		= read_hv_clock,
57	.mask		= CLOCKSOURCE_MASK(64),
58};
59
60static void __init ms_hyperv_init_platform(void)
61{
62	/*
63	 * Extract the features and hints
64	 */
65	ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
66	ms_hyperv.hints    = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
67
68	printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
69	       ms_hyperv.features, ms_hyperv.hints);
70
71	clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
72}
73
74const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
75	.name			= "Microsoft HyperV",
76	.detect			= ms_hyperv_platform,
77	.init_platform		= ms_hyperv_init_platform,
78};
79EXPORT_SYMBOL(x86_hyper_ms_hyperv);

 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
20struct ms_hyperv_info ms_hyperv;
21EXPORT_SYMBOL_GPL(ms_hyperv);
22
23static bool __init ms_hyperv_platform(void)
24{
25	u32 eax;
26	u32 hyp_signature[3];
27
28	if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
29		return false;
30
31	cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
32	      &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
33
34	return eax >= HYPERV_CPUID_MIN &&
35		eax <= HYPERV_CPUID_MAX &&
36		!memcmp("Microsoft Hv", hyp_signature, 12);
37}
38
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
39static void __init ms_hyperv_init_platform(void)
40{
41	/*
42	 * Extract the features and hints
43	 */
44	ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
45	ms_hyperv.hints    = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
46
47	printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
48	       ms_hyperv.features, ms_hyperv.hints);
 
 
49}
50
51const __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};
56EXPORT_SYMBOL(x86_hyper_ms_hyperv);