1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/kernel/isa.c b/arch/arm/kernel/isa.c
new file mode 100644
index 0000000000..20218876be
--- /dev/null
+++ b/arch/arm/kernel/isa.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  linux/arch/arm/kernel/isa.c
+ *
+ *  Copyright (C) 1999 Phil Blundell
+ *
+ *  ISA shared memory and I/O port support, and is required to support
+ *  iopl, inb, outb and friends in userspace via glibc emulation.
+ */
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+static unsigned int isa_membase, isa_portbase, isa_portshift;
+
+static struct ctl_table ctl_isa_vars[4] = {
+	{
+		.procname	= "membase",
+		.data		= &isa_membase, 
+		.maxlen		= sizeof(isa_membase),
+		.mode		= 0444,
+		.proc_handler	= proc_dointvec,
+	}, {
+		.procname	= "portbase",
+		.data		= &isa_portbase, 
+		.maxlen		= sizeof(isa_portbase),
+		.mode		= 0444,
+		.proc_handler	= proc_dointvec,
+	}, {
+		.procname	= "portshift",
+		.data		= &isa_portshift, 
+		.maxlen		= sizeof(isa_portshift),
+		.mode		= 0444,
+		.proc_handler	= proc_dointvec,
+	}, {}
+};
+
+static struct ctl_table_header *isa_sysctl_header;
+
+void __init
+register_isa_ports(unsigned int membase, unsigned int portbase, unsigned int portshift)
+{
+	isa_membase = membase;
+	isa_portbase = portbase;
+	isa_portshift = portshift;
+	isa_sysctl_header = register_sysctl("bus/isa", ctl_isa_vars);
+}