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In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit ... On x86 processors, the opcode of HLT is 0xF4.
The 80386 also introduced the two new segment registers FS and GS as well as the x86 control, debug and test registers. The new instructions introduced in the 80386 can broadly be subdivided into two classes: Pre-existing opcodes that needed new mnemonics for their 32-bit OperandSize variants (e.g. CWDE, LODSD)
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 ]
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]
Ralf Brown's Interrupt List (aka RBIL, x86 Interrupt List, MS-DOS Interrupt List or INTER) is a comprehensive list of interrupts, calls, hooks, interfaces, data structures, CMOS settings, memory and port addresses, as well as processor opcodes for x86 machines from the 1981 IBM PC up to 2000 (including many clones), [1] [2] [nb 1] most of it still applying to IBM PC compatibles today.
Opcode abbreviated from operation code is the portion of a machine language instruction that specifies the operation to be performed. Base instructions form a Turing-complete instruction set. Object model instructions provide an implementation for the Common Type System.
HLT (x86 instruction) I. INT (x86 instruction) Intel ADX; Intel BCD opcodes; Intel MPX; Intel SHA extensions; Interrupt flag; J. JMP (x86 instruction) L.
INT is an assembly language instruction for x86 processors that generates a software interrupt. It takes the interrupt number formatted as a byte value. [1] When written in assembly language, the instruction is written like this: INT X. where X is the software interrupt that should be generated (0-255).