pci_config_write8
pci_config_write8((u8 *)addr, value);
pci_config_write8((u8 *)addr, value & 0xff);
pci_config_write8(((u8 *)addr) + 1, value >> 8);
pci_config_write8((u8 *)addr, value);
void pci_config_write8(u8 *addr, u8 val);
pci_config_write8(addr, 64 / sizeof(u32));
pci_config_write8(addr, 64);
pci_config_write8(addr, 64 / sizeof(u32));
pci_config_write8(addr, 64);