LXR linux/arch/x86/kernel/eisa.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * EISA specific code
   4 */
   5#include <linux/ioport.h>
   6#include <linux/eisa.h>
   7#include <linux/io.h>
   8
   9#include <xen/xen.h>
  10
  11static __init int eisa_bus_probe(void)
  12{
  13        void __iomem *p;
  14
  15        if (xen_pv_domain() && !xen_initial_domain())
  16                return 0;
  17
  18        p = ioremap(0x0FFFD9, 4);
  19        if (p && readl(p) == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24))
  20                EISA_bus = 1;
  21        iounmap(p);
  22        return 0;
  23}
  24subsys_initcall(eisa_bus_probe);
  25