cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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eisa.c (455B)

      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);