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6. Glossary
AP: Application Processor, any x86 processor other than the Bootstrap Processor on IA-32 SMP systems ACPI: Advanced Configuration and Power Interface APIC: Advanced Programmable Interrupt Controller APM: Advanced Power Management, a BIOS-managed power management specification for personal computers BSP: Bootstrap Processor, the primary booting processor on IA-32 SMP systems BSS: Block Started by Symbol: the uninitialized data segment BKL: Big Kernel Lock, the Linux global kernel lock CRn: Control Register n, i386-specific control registers FPU: Floating Point Unit, a separate math coprocessor device GB: gigabyte (1024 * 1024 * 1024 bytes) GDT: Global Descriptor Table, an i386 memory management table IA: Intel Architecture (also i386, x86) IDT: Interrupt Descriptor Table, an i386-specific table that contains information used in handling interrupts initrd: initial RAM disk (see "linux/Documentation/initrd.txt") IPC: Inter-Process Communication IPI: Inter-processor Interrupt, a method of signaling interrupts between multiple processors on an SMP system IRDA: InfraRed Data Association IRQ: Interrupt ReQuest ISA: Industry Standard Architecture KB: kilobyte (1024 bytes) LDT: Local Descriptor Table, an i386-specific memory management table that is used to describe memory for each non-kernel process MB: megabyte (1024 * 1024 bytes) MCA: Micro Channel Architecture, used in IBM PS/2 computers MP: Multi-processor MSW: Machine Status Word MTRR: Memory Type Range Registers PAE: Physical Address Extension: extends the address space to 64 GB instead of 4 GB PCI: Peripheral Component Interconnect, an industry standard for connecting devices on a local bus in a computer system PCMCIA: Personal Computer Memory Card International Association; defines standards for PCMCIA cards and CardBus PC Cards PIC: Programmable Interrupt Controller PNP: Plug aNd Play PSE: Page Size Extension: allows 4 MB pages SMP: Symmetric Multi Processor/Processing TLB: Translation Lookaside Buffer, i386-specific processor cache of recent page directory and page table entries TSS: Task State Segment, an i386-specific task data structure UP: Uniprocessor (single CPU) system.
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