diff options
Diffstat (limited to 'kernel/drivers/staging/unisys/visorutil/visorkmodutils.c')
-rw-r--r-- | kernel/drivers/staging/unisys/visorutil/visorkmodutils.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/kernel/drivers/staging/unisys/visorutil/visorkmodutils.c b/kernel/drivers/staging/unisys/visorutil/visorkmodutils.c new file mode 100644 index 000000000..62f0f7046 --- /dev/null +++ b/kernel/drivers/staging/unisys/visorutil/visorkmodutils.c @@ -0,0 +1,71 @@ +/* timskmodutils.c + * + * Copyright (C) 2010 - 2013 UNISYS CORPORATION + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + */ + +#include "timskmod.h" + +#define MYDRVNAME "timskmodutils" + +/* s-Par uses the Intel processor's VT-X features to separate groups of + * processors into partitions. The firmware sets the hypervisor bit and + * reports an ID in the HV capabilities leaf so that the partition's OS + * knows s-Par is present and managing the processors. + */ + +#define UNISYS_SPAR_LEAF_ID 0x40000000 + +/* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */ +#define UNISYS_SPAR_ID_EBX 0x73696e55 +#define UNISYS_SPAR_ID_ECX 0x70537379 +#define UNISYS_SPAR_ID_EDX 0x34367261 + +int unisys_spar_platform; +EXPORT_SYMBOL_GPL(unisys_spar_platform); + +static __init uint32_t visorutil_spar_detect(void) +{ + unsigned int eax, ebx, ecx, edx; + + if (cpu_has_hypervisor) { + /* check the ID */ + cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx); + return (ebx == UNISYS_SPAR_ID_EBX) && + (ecx == UNISYS_SPAR_ID_ECX) && + (edx == UNISYS_SPAR_ID_EDX); + } else { + return 0; + } +} + +static __init int visorutil_mod_init(void) +{ + if (visorutil_spar_detect()) { + unisys_spar_platform = TRUE; + return 0; + } else { + return -ENODEV; + } +} + +static __exit void +visorutil_mod_exit(void) +{ +} + +module_init(visorutil_mod_init); +module_exit(visorutil_mod_exit); + +MODULE_LICENSE("GPL"); |