Hello list,
I am trying to understand the PCI functionality in Linux kernel.
What is the best way to start to understanding this - where to start
in the kernel code ? Books ? Manuals ?
I started reading the code - where I am stuck in this function -
pci_check_type2() ; Wherein I am not able to get from where these values
0xCFB,0xCF8,0xCFA are arrived at ? I guess these are port numbers , but
in which manuals can I find this all information.
linux/arch/x86/pci/init.c:
static int __init pci_check_type2(void)
{
unsigned long flags;
int works = 0;
local_irq_save(flags);
outb(0x00, 0xCFB);
outb(0x00, 0xCF8);
outb(0x00, 0xCFA);
if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00 &&
pci_sanity_check(&pci_direct_conf2)) {
works = 1;
}
local_irq_restore(flags);
return works;
}
Please help me figuring out right manuals for this.
-- Onkar
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