1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/arch/arm/kernel/isa.c
4 *
5 * Copyright (C) 1999 Phil Blundell
6 *
7 * ISA shared memory and I/O port support, and is required to support
8 * iopl, inb, outb and friends in userspace via glibc emulation.
9 */
10#include <linux/stddef.h>
11#include <linux/types.h>
12#include <linux/fs.h>
13#include <linux/sysctl.h>
14#include <linux/init.h>
15#include <linux/io.h>
16
17static unsigned int isa_membase, isa_portbase, isa_portshift;
18
19static const struct ctl_table ctl_isa_vars[] = {
20 {
21 .procname = "membase",
22 .data = &isa_membase,
23 .maxlen = sizeof(isa_membase),
24 .mode = 0444,
25 .proc_handler = proc_dointvec,
26 }, {
27 .procname = "portbase",
28 .data = &isa_portbase,
29 .maxlen = sizeof(isa_portbase),
30 .mode = 0444,
31 .proc_handler = proc_dointvec,
32 }, {
33 .procname = "portshift",
34 .data = &isa_portshift,
35 .maxlen = sizeof(isa_portshift),
36 .mode = 0444,
37 .proc_handler = proc_dointvec,
38 },
39};
40
41static struct ctl_table_header *isa_sysctl_header;
42
43void __init
44register_isa_ports(unsigned int membase, unsigned int portbase, unsigned int portshift)
45{
46 isa_membase = membase;
47 isa_portbase = portbase;
48 isa_portshift = portshift;
49 isa_sysctl_header = register_sysctl("bus/isa", ctl_isa_vars);
50}
51

source code of linux/arch/arm/kernel/isa.c