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In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. [1] Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react.
The Intel 8086 and subsequent processors in the x86 series have an HLT (halt) instruction, opcode F4, which stops instruction execution and places the processor in a HALT state. An enabled interrupt, a debug exception, the BINIT signal, the INIT signal, or the RESET signal resumes execution, which means the processor can always be restarted. [ 15 ]
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new ...
HLT may refer to: Computing. HLT (x86 instruction) Human language technology; Places. Hamilton Airport (Victoria), Australia;
Each instruction in the x86 assembly language is represented by a mnemonic which often combines with one or more operands to translate into one or more bytes known as an opcode. For example, the NOP instruction translates to the opcode 0x90, and the HLT instruction translates to 0xF4. [3]
On processors that have a halt instruction that stops the CPU until an interrupt occurs, such as x86's HLT instruction, it may save significant amounts of power and heat if the idle task consists of a loop which repeatedly executes that instruction.
Pages in category "x86 instructions" The following 53 pages are in this category, out of 53 total. ... HLT (x86 instruction) I. INT (x86 instruction) Intel ADX;
Differs from the conventional 8086 HLT instruction in that the clock is stopped too, so that an NMI or CPU reset is needed to resume operation. BRKS imm8: F1 ib: Break and Enable Software Guard. Jump to an address picked from the IVT using the imm8 argument, and then continue execution with "Software Guard" enabled.