On Thu, Mar 7, 2013 at 7:28 PM, Kevin Wilson <wkevils@gmail.com> wrote:
Hello, what is the difference between disabling interrupts and masking interrupts ? Disabling interrupts is done, AFAIK, with irq_disable(). Disabling interrupts means that you have disabled the source of interrupt. Masking means that you are not(CPU) going to handle the interrupts until it is unmasked. (see below) Can someone gives an example of how to mask interrupts with x86/x86_64 ? Not familiar with x86. Try asking in kernel mailing list.I guess you will get more help there.
irq_disable() in x86 goes to native_irq_disable(), which eventually calls assembler "cli" command:
CLI clears the IF bit in the flags.
static inline void native_irq_disable(void) { asm volatile("cli": : :"memory"); } see arch/x86/include/asm/irqflags.h
rgs, Kevin
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