runtime.mspan.init (method) 2 uses runtime (current package) mheap.go#L1210: s.init(base, npages) mheap.go#L1525: func (span *mspan) init(base uintptr, npages uintptr) {
The pages are generated with Golds v0.2.8-preview. (GOOS=darwin GOARCH=arm64)