Intel manual says that local APIC registers are memory mapped to a 4KB region, with the default address being FEE00000H. This address can be modified using IA32_APIC_BASE MSR. Quoting SDM Vol 3, s...

I'm trying to implement a function that would call an interrupt signal in Go. I know how to intercept interrupt signals from the console, by using signal.Notify(interruptChannel, os.Interrupt), how...

I have written a bash script to carry out some tests on my system. The tests run in the background and in parallel. The tests can take a long time and sometimes I may wish to abort the tests part w...

The standard technique to enforce atomic access to volatile variables shared with ISRs, via "atomic access guards" or "interrupt guards", in particular when running a bare metal...

Why are interrupts disabled when the kernel is currently handling an interrupt ? What if an interrupt carrying an important message is missed ?

I want to know the difference between FIQ and IRQ interrupt system in any microprocessor, e.g: ARM926EJ.

I'm running some data analysis in ipython notebook. A separate machine collects some data and saves them to a server folder, and my notebook scans this server periodically for new files, and analyz...

I have loaded an idt table with 256 entries, all pointing to similar handlers: for exceptions 8 and 10-14, push the exception number (these exceptions push an error code automatically) for the ot...

I want to sort an array, using Web Workers. But this array might receive new values over time, while the worker is still performing the sort function. So my question is, how can I "stop" the sorti...

Based on various references, my subjective definition of signals in Linux is "The triggers that are used to notify the processes about an occurrence of a specific event.Event here may refer to a so...

I am on windows 10, with Cygwin installed. I have been using Cygwin for the compilation/assembly of c and assembly programs using Cygwin-installed "gcc" and "nasm". From what I know, nasm has a -f ...

Suppose an external interrupt request is made to 8086. Processor will handle the interrupt after completing the current instruction being executed (if any). Before handling of the interrupt, the st...

I recently came across this piece of code in an interrupt service routine (ISR): #define MAX_CHANNELS 4 static uint16_t volatile* ADCVALS[MAX_CHANNELS] = { &ADC1BUF0, &ADC1BUF1, &ADC1B...

I studied interrupts vs cyclical polling and learnt the advantages of interrupts that don't have to wait for a poll. Polling seemed to me just like event-driven programming or at least similar to a...

When IF flag is cleared, (interrupt table is not ready), all maskable interrupts are disabled. Questions are: What happens if I trigger an exception? (eg: div by zero) What happens if a non-maskab...

I have a buffer that I use for UART, which is declared this way: union Eusart_Buff { uint8_t b8[16]; uint16_t b9[16]; }; struct Eusart_Msg { uint8_t msg_posn; uint8_t msg_len; union Eusart_B...

I have a little script that watches files for changes using inotifywait. When something changes, a batch of files are sent through a process (compiled, compressed, reorganised, etc) that takes abou...

This question is purely academic because no-one uses MS-DOS now, but I still want to know why. In some books and articles they said if you call a DOS interrupt during another one, it may cause a de...

This is a followup on my older question: Returning from a signal handler via setcontext I tried to write the assembly for doing the context switch from a signal handler back to the interrupted cont...

I am not finding much material on non-atomic operations. Suppose I have a 32 bit processor and I want to keep count of microseconds in a 64 bit variable. An interrupt will update the variable every...

I am having problem with RTC alarm interrupt of STM32L151. I want my program to go to RTC alarm interrupt every second but it does not work. My main funtion: int main(void) { HAL_Init(); SystemC...

Can Hard and Soft-IRQ for the same network-packet be executed on different CPU-Cores when network packets are processed on Linux x86_64 kernel 3.16? Hard-IRQ raises Soft-IRQ: http://she-devel.com/...

Basically, what the question title says. Thread t = new Thread(someRunnable); t.start(); t.interrupt(); t.join(); //does an InterruptedException get thrown immediately here? From my own tests, i...

On my Debian 8 system, when I run the command watch -n0.1 --no-title cat /proc/interrupts, I get the output below. CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 [0/1808] 0: 46 0 0 10215 0 0 0 0 IO-API...

I want to design a simple embedded system. The special thing about this is that I want to design its architecture using UML. Among other diagrams I'm using, I have a Sequence Diagram as the one sho...