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Sourcecode: linux-2.6 version File versions

console.c

/*
 *    linux/arch/alpha/kernel/console.c
 *
 * Architecture-specific specific support for VGA device on 
 * non-0 I/O hose
 */

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <asm/vga.h>
#include <asm/machvec.h>

#ifdef CONFIG_VGA_HOSE

/*
 * Externally-visible vga hose bases
 */
unsigned long __vga_hose_io_base = 0;     /* base for default hose */
unsigned long __vga_hose_mem_base = 0;    /* base for default hose */

static struct pci_controller * __init 
default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
{
      if (h2->index < h1->index)
            return h2;

      return h1;
}

void __init 
set_vga_hose(struct pci_controller *hose)
{
      if (hose) {
            __vga_hose_io_base = hose->io_space->start;
            __vga_hose_mem_base = hose->mem_space->start;
      }
}

void __init 
locate_and_init_vga(void *(*sel_func)(void *, void *))
{
      struct pci_controller *hose = NULL;
      struct pci_dev *dev = NULL;

      if (!sel_func) sel_func = (void *)default_vga_hose_select;

      for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
            if (!hose) hose = dev->sysdata;
            else hose = sel_func(hose, dev->sysdata);
      }

      /* Did we already inititialize the correct one? */
      if (conswitchp == &vga_con &&
          __vga_hose_io_base == hose->io_space->start &&
          __vga_hose_mem_base == hose->mem_space->start)
            return;

      /* Set the VGA hose and init the new console */
      set_vga_hose(hose);
      take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
}

#endif

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