console.c

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/*
 *  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