hi clemens I have a doubt, I have a ia32 uniprocessor machine. whenever i try to compile my kernel 2.6 with SMP support enabled, i don't see any option regarding APIC. But when i try to compile it without SMP support, there appears a option for LOCAL APIC support. -IS APIC support selected by default for SMP kernel. -I get the feeling that without smp support, arch/i386/kernel/i8259.c file is used for interrupt handling(if APIC support not selected), while for SMP aware kernel arch/i386/kernel/io_apic.c is the file used please correct me if i am wrong thanks and regard sanjayk On Fri, 10 Sep 2004 Clemens Buchacher wrote : >On Thu, Sep 09, 2004 at 12:35:29PM +0530, Dhiman, Gaurav wrote: > > In kernel source where can I find the code which actually identifies the > > IRQ number by reading the APIC mask and status registers. > >If you are talking about the Intel architecture, no registers have to be >read in order to determine the IRQ number. Every interrupt has an >appropriate gate, which is initialized in arch/i386/kernel/i8259.c or >arch/i386/kernel/io_apic.c. > >In order to understand interrupt handling would suggest studying the >kernel sources and the appropriate reference manual of your >architecture. > >Regards, >Clemens > >-- >Kernelnewbies: Help each other learn about the Linux kernel. >Archive: http://mail.nl.linux.org/kernelnewbies/ >FAQ: http://kernelnewbies.org/faq/ >
