1 files changed, 12 insertions, 0 deletions
diff --git a/src/runtime/mpallocbits.go b/src/runtime/mpallocbits.go
index b460c032bf..669a41e08f 100644
--- a/src/runtime/mpallocbits.go
+++ b/src/runtime/mpallocbits.go
@@ -16,6 +16,11 @@ func (b *pageBits) get(i uint) uint {
 	return uint((b[i/64] >> (i % 64)) & 1)
 }
 
+// block64 returns the 64-bit aligned block of bits containing the i'th bit.
+func (b *pageBits) block64(i uint) uint64 {
+	return b[i/64]
+}
+
 // set sets bit i of pageBits.
 func (b *pageBits) set(i uint) {
 	b[i/64] |= 1 << (i % 64)
@@ -339,6 +344,13 @@ func (b *pallocBits) freeAll() {
 	(*pageBits)(b).clearAll()
 }
 
+// pages64 returns a 64-bit bitmap representing a block of 64 pages aligned
+// to 64 pages. The returned block of pages is the one containing the i'th
+// page in this pallocBits. Each bit represents whether the page is in-use.
+func (b *pallocBits) pages64(i uint) uint64 {
+	return (*pageBits)(b).block64(i)
+}
+
 // findBitRange64 returns the bit index of the first set of
 // n consecutive 1 bits. If no consecutive set of 1 bits of
 // size n may be found in c, then it returns an integer >= 64.