projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9d9baadd KC |
1 | /* timskmodutils.c |
| 2 | * | |
| f6d0c1e6 | 3 | * Copyright (C) 2010 - 2013 UNISYS CORPORATION |
| 9d9baadd KC |
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 | ||
| 9d9baadd KC |
18 | #include "timskmod.h" |
| 19 | ||
| 20 | #define MYDRVNAME "timskmodutils" | |
| 21 | ||
| fcd0157e KC |
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 | ||
| 670db786 | 38 | static __init uint32_t visorutil_spar_detect(void) |
| fcd0157e KC |
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); | |
| 670db786 | 48 | } else { |
| fcd0157e | 49 | return 0; |
| 670db786 | 50 | } |
| fcd0157e KC |
51 | } |
| 52 | ||
| 2291b268 | 53 | static __init int visorutil_mod_init(void) |
| fcd0157e KC |
54 | { |
| 55 | if (visorutil_spar_detect()) { | |
| 779d0752 | 56 | unisys_spar_platform = true; |
| fcd0157e | 57 | return 0; |
| 2291b268 | 58 | } else { |
| fcd0157e | 59 | return -ENODEV; |
| 2291b268 | 60 | } |
| fcd0157e KC |
61 | } |
| 62 | ||
| 63 | static __exit void | |
| 64 | visorutil_mod_exit(void) | |
| 65 | { | |
| 66 | } | |
| 67 | ||
| 68 | module_init(visorutil_mod_init); | |
| 69 | module_exit(visorutil_mod_exit); | |
| 70 | ||
| 37b7e990 | 71 | MODULE_LICENSE("GPL"); |