1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * EISA specific code
4 */
5 #include <linux/cc_platform.h>
6 #include <linux/ioport.h>
7 #include <linux/eisa.h>
8 #include <linux/io.h>
9
10 #include <xen/xen.h>
11
12 static __init int eisa_bus_probe(void)
13 {
14 void __iomem *p;
15
16 if ((xen_pv_domain() && !xen_initial_domain()) || cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
17 return 0;
18
19 p = ioremap(0x0FFFD9, 4);
20 if (p && readl(p) == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24))
21 EISA_bus = 1;
22 iounmap(p);
23 return 0;
24 }
25 subsys_initcall(eisa_bus_probe);
26
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