init.c

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#include <linux/pci.h>
#include <linux/init.h>
#include <asm/pci_x86.h>
#include <asm/x86_init.h>

/* arch_initcall has too random ordering, so call the initializers
   in the right sequence from here. */
static __init int pci_arch_init(void)
{
#ifdef CONFIG_PCI_DIRECT
    int type = 0;

    type = pci_direct_probe();
#endif

    if (!(pci_probe & PCI_PROBE_NOEARLY))
        pci_mmcfg_early_init();

    if (x86_init.pci.arch_init && !x86_init.pci.arch_init())
        return 0;

#ifdef CONFIG_PCI_BIOS
    pci_pcbios_init();
#endif
    /*
     * don't check for raw_pci_ops here because we want pcbios as last
     * fallback, yet it's needed to run first to set pcibios_last_bus
     * in case legacy PCI probing is used. otherwise detecting peer busses
     * fails.
     */
#ifdef CONFIG_PCI_DIRECT
    pci_direct_init(type);
#endif
    if (!raw_pci_ops && !raw_pci_ext_ops)
        printk(KERN_ERR
        "PCI: Fatal: No config space access function found\n");

    dmi_check_pciprobe();

    dmi_check_skip_isa_align();

    return 0;
}
arch_initcall(pci_arch_init);