kernel/util: Add bit hack utilities

headers/private/kernel/util/BitUtils.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2013 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Paweł Dziepak, [email protected]
+ */
+#ifndef KERNEL_UTIL_BITUTIL_H
+#define KERNEL_UTIL_BITUTIL_H
+
+
+#include <SupportDefs.h>
+
+
+// http://graphics.stanford.edu/~seander/bithacks.html
+static inline uint32
+nextPowerOf2(uint32 v)
+{
+	v--;
+	v |= v >> 1;
+	v |= v >> 2;
+	v |= v >> 4;
+	v |= v >> 8;
+	v |= v >> 16;
+	v++;
+
+	return v;
+}
+
+
+// http://graphics.stanford.edu/~seander/bithacks.html
+static inline uint32
+countSetBits(uint32 v)
+{
+	v = v - ((v >> 1) & 0x55555555);
+	v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
+	return (((v + (v >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
+}
+
+
+#endif	// KERNEL_UTIL_RANDOM_H
+

src/system/kernel/arch/x86/arch_cpu.cpp

@@ -21,6 +21,7 @@
 #include <debug.h>
 #include <elf.h>
 #include <smp.h>
+#include <util/BitUtils.h>
 #include <vm/vm.h>
 #include <vm/vm_types.h>
 #include <vm/VMAddressSpace.h>
@@ -129,32 +130,6 @@ static uint32 sHierarchyMask[CPU_TOPOLOGY_LEVELS];
 static uint32 sHierarchyShift[CPU_TOPOLOGY_LEVELS];
 
 
-// http://graphics.stanford.edu/~seander/bithacks.html
-static inline uint32
-nextPowerOf2(uint32 v)
-{
-	v--;
-	v |= v >> 1;
-	v |= v >> 2;
-	v |= v >> 4;
-	v |= v >> 8;
-	v |= v >> 16;
-	v++;
-
-	return v;
-}
-
-
-// http://graphics.stanford.edu/~seander/bithacks.html
-static inline uint32
-countSetBits(uint32 v)
-{
-	v = v - ((v >> 1) & 0x55555555);
-	v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
-	return (((v + (v >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
-}
-
-
 static status_t
 acpi_shutdown(bool rebootSystem)
 {