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 11 static __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 } 24 subsys_initcall(eisa_bus_probe); 25