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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 <linux/vt.h>
#include <asm/vga.h>
#include <asm/machvec.h>

#include "pci_impl.h"

#ifdef CONFIG_VGA_HOSE

struct pci_controller *pci_vga_hose;
static struct resource alpha_vga = {
      .name = "alpha-vga+",
      .start      = 0x3C0,
      .end  = 0x3DF
};

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

      /* Default the select function */
      if (!sel_func) sel_func = (void *)default_vga_hose_select;

      /* Find the console VGA device */
      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 initialize the correct one? Is there one? */
      if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
            return;

      /* Create a new VGA ioport resource WRT the hose it is on. */
      alpha_vga.start += hose->io_space->start;
      alpha_vga.end += hose->io_space->start;
      request_resource(hose->io_space, &alpha_vga);

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

void __init
find_console_vga_hose(void)
{
      u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);

      if (pu64[7] == 3) {     /* TERM_TYPE == graphics */
            struct pci_controller *hose;
            int h = (pu64[30] >> 24) & 0xff;    /* console hose # */

            /*
             * Our hose numbering DOES match the console's, so find
             * the right one...
             */
            for (hose = hose_head; hose; hose = hose->next) {
                  if (hose->index == h) break;
            }

            if (hose) {
                  printk("Console graphics on hose %d\n", h);
                  pci_vga_hose = hose;
            }
      }
}

#endif

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