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diff --git a/kitten/lib/cpumask.c b/kitten/lib/cpumask.c
new file mode 100644
index 0000000..1387f12
--- /dev/null
+++ b/kitten/lib/cpumask.c
@@ -0,0 +1,40 @@
+#include <lwk/kernel.h>
+#include <lwk/bitops.h>
+#include <lwk/cpumask.h>
+
+int __first_cpu(const cpumask_t *srcp)
+{
+	return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
+}
+
+int __next_cpu(int n, const cpumask_t *srcp)
+{
+	return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
+}
+
+/*
+ * Find the highest possible smp_cpu_id()
+ *
+ * Note: if we're prepared to assume that cpu_possible_map never changes
+ * (reasonable) then this function should cache its return value.
+ */
+int highest_possible_cpu_id(void)
+{
+	unsigned int cpu;
+	unsigned highest = 0;
+
+	for_each_cpu_mask(cpu, cpu_present_map)
+		highest = cpu;
+	return highest;
+}
+
+int __any_online_cpu(const cpumask_t *mask)
+{
+	int cpu;
+
+	for_each_cpu_mask(cpu, *mask) {
+		if (cpu_online(cpu))
+			break;
+	}
+	return cpu;
+}