Here is a list of all documented namespaces with brief descriptions:

[detail level 123]

▼NACPI	Abstracts the ACPI standard that provides interfaces for hardware detection, device configuration, and energy management
▼NMADS
CLAPIC	Processor Local APIC (LAPIC) Structure
CIOAPIC	I/O APIC Structure
CInterrupt_Source_Override	Interrupt Source Override Structure
CLAPIC_Address_Override	Local APIC Address Override Structure
CRSDP	Root System Description Pointer (RSDP)
CSDTH	System Description Table Header (SDTH)
CRSDT	Root System Description Table (RSDT)
CXSDT	Extended System Description Table (XSDT)
CSubHeader	Helper structure
CMADT	Multiple APIC Description Table (MADT)
CAddress	ACPI address format
NAPIC	Information about the (extended) Advanced Programmable Interrupt Controller
NCMOS	CMOS
▼NCore	Implements an abstraction for CPU internals
NInterrupt	Exception and Interrupt control
CCR	Access to the Control Register
▼CMSR	Access to the Model-Specific Register (MSR)
Cuint64_parts	Helper to access low and high bits of a 64 bit value
NCSU	C StartUp (CSU) required by the compiler and provided by the c standard library
▼NGDT	Abstracts the GDT that, primarily, contains descriptors to memory segments
CSegmentDescriptor	Describes the structure of segment descriptors
CPointer	Structure that describes a GDT Pointer (aka GDT Descriptor)
NGuard	Synchronizes the kernel with interrupts using the Prologue/Epilogue Model
NIDT	"Interrupt Descriptor Table (IDT)
▼NIOAPIC	Abstraction of the I/O APIC that is used for management of external interrupts
CIdentification	I/O APIC Identification
CRedirectionTableEntry	Entry in the redirection table
▼NLAPIC	Abstracts the local APIC (which is integrated into every CPU core)
▼NIPI	Inter-Processor Interrupts
CInterruptCommand	Interrupt Command
▼NTimer	Local Timer (for each LAPIC / CPU)
CControlRegister	LAPIC-Timer Control Register
CIdentificationRegister	Local APIC ID (for Pentium 4 and newer)
CVersionRegister	Local APIC Version
CLogicalDestinationRegister	Logical Destination Register
CDestinationFormatRegister	Destination Format Register
CTaskPriorityRegister	Task Priority Register
CSpuriousInterruptVectorRegister	Spurious Interrupt Vector Register
NMath	Basic math helper functions
▼NMultiboot	Interface for Multiboot
CModule	Boot Module (also known as `initrd` = initial Ramdisk)
CMemory	Memory Map
CVBE	Video mode: Vesa BIOS Extension
CFramebuffer	Video mode: Framebuffer
NPIC	The Programmable Interrupt Controller (PIC aka 8259A)
NPIT	Abstraction of the historical Programmable Interval Timer (PIT)
NPlugbox	Object-oriented abstraction of an device interrupt table
NPS2Controller	PS/2 Controller
NSystem	General System functions