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- An 'Interrupt Flag' is a register that is set when an interrupt request is sent to the CPU, indicating that an interrupt has occurred and needs to be processed.www.sciencedirect.com/topics/computer-science/interrupt-flag
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Interrupt flag - Wikipedia
The Interrupt flag (IF) is a flag bit in the CPU's FLAGS register, which determines whether or not the (CPU) will respond immediately to maskable hardware interrupts. If the flag is set to 1 maskable interrupts are enabled. If reset (set to 0) such interrupts will be disabled until interrupts are enabled. The Interrupt flag … See more
In a system using x86 architecture, the instructions CLI (Clear Interrupt) and STI (Set Interrupt). The POPF (Pop Flags) removes a word from the stack into the FLAGS register, which may result in the Interrupt flag being … See more
The STI of the x86 instruction set enables interrupts by setting the IF.
In some implementations of the instruction which enables interrupts, interrupts are not enabled until after … See moreThe Interrupt flag only affects a single processor. In multiprocessor systems an interrupt handler must use other synchronization mechanisms such as locks. See more
• Intel 64 and IA-32 Architectures Software Developer Manuals - Retrieved 2017-09-14 See more
In the x86 instruction set CLI is commonly used as a synchronization mechanism in uniprocessor systems. For example, a CLI is used in operating systems to disable interrupts so kernel code (typically a driver) can avoid race conditions within an interrupt handler See more
Wikipedia text under CC-BY-SA license FLAGS register - Wikipedia
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What happens when an ISR is running and another …
Apr 20, 2016 · When something happens to cause an interrupt, a flag is set. When the interrupt flag is noticed, the "Global Interrupt Enable" bit is cleared. The appropriate ISR is run. The "Global Interrupt Enable" bit is re-set. Things now …
Different Types of Control Flags for the 8086
Jun 17, 2024 · Interrupt Enable Flag (IF) – Bit 9. This flag controls the recognition of external interrupts by the CPU. When the Interrupt Enable Flag is set (IF = 1), the CPU will recognize and respond to external interrupt requests. When it is …
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Osdev-Notes/02_Architecture/05_InterruptHandling.md at master …
Chapter 12: Interrupts - University of Texas at Austin
An interrupt is the automatic transfer of software execution in response to a hardware event that is asynchronous with the current software execution. This hardware event is called a trigger.
The 8086 Interrupt Mechanism: The 8259A PIC - GitHub Pages
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Status register - Wikipedia
Reverse-engineering the interrupt circuitry in the Intel 8086 …
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