1 files changed, 67 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
new file mode 100644
index 000000000000..2443b61cdb17
--- /dev/null
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -0,0 +1,67 @@
+/*
+ * HyperV  Detection code.
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/types.h>
+#include <asm/processor.h>
+#include <asm/hyperv.h>
+#include <asm/mshyperv.h>
+
+
+int ms_hyperv_platform(void)
+{
+        u32 eax, ebx, ecx, edx;
+        char hyp_signature[13];
+
+        cpuid(1, &eax, &ebx, &ecx, &edx);
+        if (!(ecx & HYPERV_HYPERVISOR_PRESENT_BIT))
+                return 0;
+
+        cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, &eax, &ebx, &ecx, &edx);
+        *(u32 *)(hyp_signature + 0) = ebx;
+        *(u32 *)(hyp_signature + 4) = ecx;
+        *(u32 *)(hyp_signature + 8) = edx;
+
+        if ((eax < HYPERV_CPUID_MIN) || (memcmp("Microsoft Hv", hyp_signature, 12)))
+                return 0;
+        return 1;
+}
+
+void __cpuinit ms_hyperv_set_feature_bits(struct cpuinfo_x86 *c)
+{
+        u32 eax, ebx, ecx, edx;
+
+        c->x86_hyper_features = 0;
+        /*
+         * Extract the features, recommendations etc.
+         * The first 9 bits will be used to track hypervisor features.
+         * The next 6 bits will be used to track the hypervisor
+         * recommendations.
+         */
+        cpuid(HYPERV_CPUID_FEATURES, &eax, &ebx, &ecx, &edx);
+        c->x86_hyper_features |= (eax & 0x1ff);
+
+        cpuid(HYPERV_CPUID_ENLIGHTMENT_INFO, &eax, &ebx, &ecx, &edx);
+        c->x86_hyper_features |= ((eax & 0x3f) << 9);
+        printk(KERN_INFO "Detected HyperV with features: %x\n",
+                c->x86_hyper_features);
+}