1 /* 2 * linux/arch/alpha/kernel/console.c 3 * 4 * Architecture-specific specific support for VGA device on 5 * non-0 I/O hose 6 */ 7 8 #include <linux/pci.h> 9 #include <linux/init.h> 10 #include <linux/tty.h> 11 #include <linux/console.h> 12 #include <asm/vga.h> 13 #include <asm/machvec.h> 14 15 #ifdef CONFIG_VGA_HOSE 16 17 /* 18 * Externally-visible vga hose bases 19 */ 20 unsigned long __vga_hose_io_base = 0; /* base for default hose */ 21 unsigned long __vga_hose_mem_base = 0; /* base for default hose */ 22 23 static struct pci_controller * __init 24 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2) 25 { 26 if (h2->index < h1->index) 27 return h2; 28 29 return h1; 30 } 31 32 void __init 33 set_vga_hose(struct pci_controller *hose) 34 { 35 if (hose) { 36 __vga_hose_io_base = hose->io_space->start; 37 __vga_hose_mem_base = hose->mem_space->start; 38 } 39 } 40 41 void __init 42 locate_and_init_vga(void *(*sel_func)(void *, void *)) 43 { 44 struct pci_controller *hose = NULL; 45 struct pci_dev *dev = NULL; 46 47 if (!sel_func) sel_func = (void *)default_vga_hose_select; 48 49 for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) { 50 if (!hose) hose = dev->sysdata; 51 else hose = sel_func(hose, dev->sysdata); 52 } 53 54 /* Did we already inititialize the correct one? */ 55 if (conswitchp == &vga_con && 56 __vga_hose_io_base == hose->io_space->start && 57 __vga_hose_mem_base == hose->mem_space->start) 58 return; 59 60 /* Set the VGA hose and init the new console */ 61 set_vga_hose(hose); 62 take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1); 63 } 64 65 #endif 66