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what is the difference between PPI, SPI and SGI interrupts?


what is the difference between PPI, SPI and SGI interrupts?

By : TheSpartin
Date : November 21 2020, 07:31 AM
wish helps you Software Generated Interrupt (SGI) This interrupt is generated explicitly by software by writing to a dedicated distributor register, the Software Generated Interrupt Register. It is most commonly used for inter-core communication. SGIs can be targeted at all, or at a selected group of cores in the system. Interrupt numbers 0-15 are reserved for this. The software manages the exact interrupt number used for communication.
Private Peripheral Interrupt (PPI) This interrupt is generated by a peripheral that is private to an individual core. Interrupt numbers 16-31 are reserved for this. PPIs identify interrupt sources private to the core, and are independent of the same source on another core, for example, per-core timer.
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what is the difference between enabling interrupts and restoring interrupts?

what is the difference between enabling interrupts and restoring interrupts?


By : oleg yakimets
Date : March 29 2020, 07:55 AM
like below fixes the issue Where excatly did you come across these? I would like to know the context to give more details. AFAIK its like this
Restore interrupt: means restore interrupt flag to the state prior ie old state void _restore_interrupts(unsigned int);
Why software interrupts can sleep while it is not allowed in hardware interrupts?

Why software interrupts can sleep while it is not allowed in hardware interrupts?


By : Lindir
Date : March 29 2020, 07:55 AM
help you fix your problem When you enter in the kernel code through a process (i.e., a syscall) the kernel is said to be in process context. This means that the kernel is executed on behalf of a process. The execution of the kernel is synchronous with the user-level, and therefore it is possible to access user-level. It is also possible to call sleeping functions, because the scheduler is capable of schedule a new process.
When you enter in the kernel from a hardware source (i.e., an interrupt), then the kernel is said to be in interrupt context. The execution of the kernel is asynchronous with respect to the user-level, and you cannot do any ssumption of what is being executed at user-level. For example, some resources may be in some unconsistent state. For this reason, the code cannot block because the scheduler cannot schedule a new process.
On x86, when the OS disables interrupts, do they vanish, or do they queue and 'wait' for interrupts to come back on?

On x86, when the OS disables interrupts, do they vanish, or do they queue and 'wait' for interrupts to come back on?


By : Karn Tawitkarn
Date : March 29 2020, 07:55 AM
should help you out Some background
Interrupts from the peripherals are not directly handled by the CPU, instead by a hardware called "Programmable Interrupt Controller". Earlier systems used a PIC - (Intel 8259) but due to its lack of support for SMP systems, nowadays Adavnced PIC - APIC (Intel 82093) is used. APIC has two components, IO APIC (part of motherboard) forwards these interrupt requests to the local APIC (part of the CPU).
Difference between TRAP , software interrupts and hardware interrupts?

Difference between TRAP , software interrupts and hardware interrupts?


By : Sulitskiy House Cour
Date : March 29 2020, 07:55 AM
This might help you The terminology is indeed a bit blurry and may depend on the CPU vendor.
What is clear is that a hardware interrupt is triggered by a hardware signal and makes the CPU enter a predefined ISR. These are exceptions triggered by (typically external) hardware.
Difference between Software and Hardware Interrupts

Difference between Software and Hardware Interrupts


By : Oleg Zeltser
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I think you're trying to figure out what are software interrupts needed for and how to use them rather than the difference.
Let's start with what's common for software and hardware interrupt: they're both used to switch from main execution context to low-level interrupt handler in order to perform some low level operations - mainly on peripheral register.
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