Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / unisys / visorutil / visorkmodutils.c

diff --git a/kernel/drivers/staging/unisys/visorutil/visorkmodutils.c b/kernel/drivers/staging/unisys/visorutil/visorkmodutils.c
new file mode 100644 (file)
index 0000000..62f0f70
--- /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");