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/config.h> 9 #include <linux/pci.h> 10 #include <linux/init.h> 11 #include <linux/tty.h> 12 #include <linux/console.h> 13 #include <asm/vga.h> 14 #include <asm/machvec.h> 15 16 #ifdef CONFIG_VGA_HOSE 17 18 /* 19 * Externally-visible vga hose bases 20 */ 21 unsigned long __vga_hose_io_base = 0; /* base for default hose */ 22 unsigned long __vga_hose_mem_base = 0; /* base for default hose */ 23 24 static struct pci_controller * __init 25 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2) 26 { 27 if (h2->index < h1->index) 28 return h2; 29 30 return h1; 31 } 32 33 void __init 34 set_vga_hose(struct pci_controller *hose) 35 { 36 if (hose) { 37 __vga_hose_io_base = hose->io_space->start; 38 __vga_hose_mem_base = hose->mem_space->start; 39 } 40 } 41 42 void __init 43 locate_and_init_vga(void *(*sel_func)(void *, void *)) 44 { 45 struct pci_controller *hose = NULL; 46 struct pci_dev *dev = NULL; 47 48 if (!sel_func) sel_func = (void *)default_vga_hose_select; 49 50 for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) { 51 if (!hose) hose = dev->sysdata; 52 else hose = sel_func(hose, dev->sysdata); 53 } 54 55 /* Did we already inititialize the correct one? */ 56 if (conswitchp == &vga_con && 57 __vga_hose_io_base == hose->io_space->start && 58 __vga_hose_mem_base == hose->mem_space->start) 59 return; 60 61 /* Set the VGA hose and init the new console */ 62 set_vga_hose(hose); 63 take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1); 64 } 65 66 #endif 67