1 files changed, 56 insertions, 1 deletions
diff --git a/drivers/staging/unisys/visorutil/visorkmodutils.c b/drivers/staging/unisys/visorutil/visorkmodutils.c
index a7d1e94..10d77cb 100644
--- a/drivers/staging/unisys/visorutil/visorkmodutils.c
+++ b/drivers/staging/unisys/visorutil/visorkmodutils.c
@@ -1,6 +1,6 @@
 /* timskmodutils.c
  *
- * Copyright © 2010 - 2013 UNISYS CORPORATION
+ * Copyright (C) 2010 - 2013 UNISYS CORPORATION
  * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,6 +20,22 @@
 
 #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);
+
 /** Callers to interfaces that set __GFP_NORETRY flag below
  *  must check for a NULL (error) result as we are telling the
  *  kernel interface that it is okay to fail.
@@ -69,3 +85,42 @@ void visor_seq_file_done_buffer(struct seq_file *m)
 	kfree(m);
 }
 EXPORT_SYMBOL_GPL(visor_seq_file_done_buffer);
+
+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");