3 * Copyright (C) 2010 - 2013 UNISYS CORPORATION
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.
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
21 #define MYDRVNAME "timskmodutils"
23 /* s-Par uses the Intel processor's VT-X features to separate groups of
24 * processors into partitions. The firmware sets the hypervisor bit and
25 * reports an ID in the HV capabilities leaf so that the partition's OS
26 * knows s-Par is present and managing the processors.
29 #define UNISYS_SPAR_LEAF_ID 0x40000000
31 /* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
32 #define UNISYS_SPAR_ID_EBX 0x73696e55
33 #define UNISYS_SPAR_ID_ECX 0x70537379
34 #define UNISYS_SPAR_ID_EDX 0x34367261
36 int unisys_spar_platform;
37 EXPORT_SYMBOL_GPL(unisys_spar_platform);
39 /** Callers to interfaces that set __GFP_NORETRY flag below
40 * must check for a NULL (error) result as we are telling the
41 * kernel interface that it is okay to fail.
44 void *kmalloc_kernel(size_t siz)
46 return kmalloc(siz, GFP_KERNEL | __GFP_NORETRY);
49 static __init uint32_t
50 visorutil_spar_detect(void)
52 unsigned int eax, ebx, ecx, edx;
54 if (cpu_has_hypervisor) {
56 cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx);
57 return (ebx == UNISYS_SPAR_ID_EBX) &&
58 (ecx == UNISYS_SPAR_ID_ECX) &&
59 (edx == UNISYS_SPAR_ID_EDX);
69 visorutil_mod_init(void)
71 if (visorutil_spar_detect()) {
72 unisys_spar_platform = TRUE;
79 visorutil_mod_exit(void)
83 module_init(visorutil_mod_init);
84 module_exit(visorutil_mod_exit);
86 MODULE_LICENSE("GPL");