pci_vga_hose
extern struct pci_controller *pci_vga_hose;
if (pci_vga_hose && __is_port_vga(a)) \
(a) += pci_vga_hose->io_space->start; \
if (pci_vga_hose && __is_mem_vga(a)) \
(a) += pci_vga_hose->mem_space->start; \
struct pci_controller *pci_vga_hose;
if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
pci_vga_hose = hose;
pci_vga_hose = hose;
pci_vga_hose = hose;
if (pci_vga_hose && __is_mem_vga(addr)) {
h = pci_vga_hose->index;
addr += pci_vga_hose->mem_space->start;