| 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(attr: CC_ATTR_GUEST_SEV_SNP)) |
| 17 | return 0; |
| 18 | |
| 19 | p = ioremap(offset: 0x0FFFD9, size: 4); |
| 20 | if (p && readl(addr: p) == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24)) |
| 21 | EISA_bus = 1; |
| 22 | iounmap(addr: p); |
| 23 | return 0; |
| 24 | } |
| 25 | subsys_initcall(eisa_bus_probe); |
| 26 |