HelenOS sources
kernel/arch/abs32le/include/arch/mm/frame.h
kernel/arch/amd64/include/arch/mm/frame.h
kernel/arch/arm32/include/arch/mm/frame.h
kernel/arch/arm64/include/arch/mm/frame.h
kernel/arch/ia32/include/arch/mm/frame.h
kernel/arch/ia64/include/arch/mm/frame.h
kernel/arch/mips32/include/arch/mm/frame.h
kernel/arch/ppc32/include/arch/mm/frame.h
kernel/arch/riscv64/include/arch/mm/frame.h
kernel/arch/sparc64/include/arch/mm/frame.h
kernel/arch/sparc64/include/arch/mm/sun4u/frame.h
kernel/arch/sparc64/include/arch/mm/sun4v/frame.h
kernel/generic/include/mm/frame.h
HelenOS homepage, sources at GitHub