1 /* timskmodutils.c
2 *
3 * Copyright (C) 2010 - 2013 UNISYS CORPORATION
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 */
17
18 #include "timskmod.h"
19
20 #define MYDRVNAME "timskmodutils"
21
22 /* s-Par uses the Intel processor's VT-X features to separate groups of
23 * processors into partitions. The firmware sets the hypervisor bit and
24 * reports an ID in the HV capabilities leaf so that the partition's OS
25 * knows s-Par is present and managing the processors.
26 */
27
28 #define UNISYS_SPAR_LEAF_ID 0x40000000
29
30 /* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
31 #define UNISYS_SPAR_ID_EBX 0x73696e55
32 #define UNISYS_SPAR_ID_ECX 0x70537379
33 #define UNISYS_SPAR_ID_EDX 0x34367261
34
35 int unisys_spar_platform;
36 EXPORT_SYMBOL_GPL(unisys_spar_platform);
37
visorutil_spar_detect(void)38 static __init uint32_t visorutil_spar_detect(void)
39 {
40 unsigned int eax, ebx, ecx, edx;
41
42 if (cpu_has_hypervisor) {
43 /* check the ID */
44 cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx);
45 return (ebx == UNISYS_SPAR_ID_EBX) &&
46 (ecx == UNISYS_SPAR_ID_ECX) &&
47 (edx == UNISYS_SPAR_ID_EDX);
48 } else {
49 return 0;
50 }
51 }
52
visorutil_mod_init(void)53 static __init int visorutil_mod_init(void)
54 {
55 if (visorutil_spar_detect()) {
56 unisys_spar_platform = TRUE;
57 return 0;
58 } else {
59 return -ENODEV;
60 }
61 }
62
63 static __exit void
visorutil_mod_exit(void)64 visorutil_mod_exit(void)
65 {
66 }
67
68 module_init(visorutil_mod_init);
69 module_exit(visorutil_mod_exit);
70
71 MODULE_LICENSE("GPL");
72