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1 | /* |
2 | * VMware Detection code. | |
3 | * | |
4 | * Copyright (C) 2008, VMware, Inc. | |
5 | * Author : Alok N Kataria <akataria@vmware.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; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
15 | * NON INFRINGEMENT. See the GNU General Public License for more | |
16 | * details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/dmi.h> | |
25 | #include <asm/div64.h> | |
26 | ||
27 | #define CPUID_VMWARE_INFO_LEAF 0x40000000 | |
28 | #define VMWARE_HYPERVISOR_MAGIC 0x564D5868 | |
29 | #define VMWARE_HYPERVISOR_PORT 0x5658 | |
30 | ||
31 | #define VMWARE_PORT_CMD_GETVERSION 10 | |
32 | #define VMWARE_PORT_CMD_GETHZ 45 | |
33 | ||
34 | #define VMWARE_PORT(cmd, eax, ebx, ecx, edx) \ | |
35 | __asm__("inl (%%dx)" : \ | |
36 | "=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) : \ | |
37 | "0"(VMWARE_HYPERVISOR_MAGIC), \ | |
38 | "1"(VMWARE_PORT_CMD_##cmd), \ | |
39 | "2"(VMWARE_HYPERVISOR_PORT), "3"(0) : \ | |
40 | "memory"); | |
41 | ||
42 | static inline int __vmware_platform(void) | |
43 | { | |
44 | uint32_t eax, ebx, ecx, edx; | |
45 | VMWARE_PORT(GETVERSION, eax, ebx, ecx, edx); | |
46 | return eax != (uint32_t)-1 && ebx == VMWARE_HYPERVISOR_MAGIC; | |
47 | } | |
48 | ||
49 | static unsigned long __vmware_get_tsc_khz(void) | |
50 | { | |
51 | uint64_t tsc_hz; | |
52 | uint32_t eax, ebx, ecx, edx; | |
53 | ||
54 | VMWARE_PORT(GETHZ, eax, ebx, ecx, edx); | |
55 | ||
56 | if (eax == (uint32_t)-1) | |
57 | return 0; | |
58 | tsc_hz = eax | (((uint64_t)ebx) << 32); | |
59 | do_div(tsc_hz, 1000); | |
60 | BUG_ON(tsc_hz >> 32); | |
61 | return tsc_hz; | |
62 | } | |
63 | ||
64 | int vmware_platform(void) | |
65 | { | |
66 | if (cpu_has_hypervisor) { | |
67 | unsigned int eax, ebx, ecx, edx; | |
68 | char hyper_vendor_id[13]; | |
69 | ||
70 | cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &ebx, &ecx, &edx); | |
71 | memcpy(hyper_vendor_id + 0, &ebx, 4); | |
72 | memcpy(hyper_vendor_id + 4, &ecx, 4); | |
73 | memcpy(hyper_vendor_id + 8, &edx, 4); | |
74 | hyper_vendor_id[12] = '\0'; | |
75 | if (!strcmp(hyper_vendor_id, "VMwareVMware")) | |
76 | return 1; | |
77 | } else if (dmi_available && dmi_name_in_vendors("VMware") && | |
78 | __vmware_platform()) | |
79 | return 1; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | unsigned long vmware_get_tsc_khz(void) | |
85 | { | |
86 | BUG_ON(!vmware_platform()); | |
87 | return __vmware_get_tsc_khz(); | |
88 | } |