Re: [Geekos-devel] defs.h

[Behrang S. <beh...@ya...>]

I know that there are two PICs installed on ATs and
beyond... what I want to say is that the binary
representation of EOI is 0x20 so the End_IRQ should be
something like this:

void End_IRQ( struct Interrupt_State* state )
{
    int irq = state->intNum - FIRST_EXTERNAL_INT;
    short int EOI = 0x20;

    if ( irq < 8 ) {
	// Specific EOI to master PIC
	Out_Byte( 0x20, EOI );
    }
    else {
	// Specific EOI to slave PIC, then to master (cascade
line)
	Out_Byte( 0xA0, EOI );
	Out_Byte( 0x20, EOI );
    }
}




Any suggestions?

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