Hello,
I'm trying to install an interrupt handler for interrupt 10 which is
generated by
a PCI video card. In the code below I request the irq, do some outs and
in's to
clear the vga interrupt and then enable it, and then do a hard interrupt
enable.
The program seems to die after I do the hard enable, at least that is the last
message I have logged. Potentially it appears to crash after I get to the
interrupt
handler, but I guess that is just speculation. Below is the code, thanks
Maybe this is a hint, sometimes on the console it says UNKNOWN INTERRUPT.
The interrupt
is not listed in /proc/interrupts but it is listed in /proc/pci as being
generated by
the video card.
Adam
#include <asm/io.h>
#include <rtl_fifo.h>
#include <rtl_core.h>
#include <rtl_time.h>
#include <rtl.h>
unsigned int intr_handler(unsigned int,struct pt_regs*);
unsigned int interrupt_count=0;
int init_module(void)
{
char portbyte;
//this is called when the module is loaded.
//here we should install our interrupt handle
printk("Loading interrupt module\n");
//interrupt 10 is where the video card retrace is
rtl_request_irq(10,intr_handler);
printk("Requested interrupt 10\n");
//now lets do the stuff to the vga so we know what the hell
//we are doing
outb_p(0x3d4,0x11);
portbyte=inb_p(0x3d5);
//clear the interrupt flag
portbyte=(portbyte & 0xef) | 0x20;
outb_p(0x3d5,(portbyte & 0xef)|0x20);
//now enable the interrupt
portbyte=(portbyte & 0xdf)|0x10;
outb_p(0x3d5,portbyte);
rtl_hard_enable_irq(10);
printk("Hard enabled interrupt 10\n");
return 0;
}
void cleanup_module(void)
{
printk("Exiting interrupt module\n");
printk("Got '%d' interrupts\n",interrupt_count);
rtl_hard_disable_irq(10);
rtl_free_irq(10);
}
unsigned int intr_handler(unsigned int irq,struct pt_regs *regs)
{
//char portbyte;
//called at interrupt time....lets just do a printk
//printk("Got interrupt '%d'",interrupt_count);
// interrupt_count++;
/*
outb_p(0x3d4,11);
portbyte=inb_p(0x3d5);
outb_p(0x3d4,11);
outb_p(0x3d5,portbyte & 0xef);
*/
rtl_hard_enable_irq(10);
return 0;
}
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