LXR linux/arch/arm/kernel/isa.c

   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 struct ctl_table ctl_isa_vars[4] = {
  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
  43static struct ctl_table ctl_isa[2] = {
  44        {
  45                .procname       = "isa",
  46                .mode           = 0555,
  47                .child          = ctl_isa_vars,
  48        }, {}
  49};
  50
  51static struct ctl_table ctl_bus[2] = {
  52        {
  53                .procname       = "bus",
  54                .mode           = 0555,
  55                .child          = ctl_isa,
  56        }, {}
  57};
  58
  59void __init
  60register_isa_ports(unsigned int membase, unsigned int portbase, unsigned int portshift)
  61{
  62        isa_membase = membase;
  63        isa_portbase = portbase;
  64        isa_portshift = portshift;
  65        isa_sysctl_header = register_sysctl_table(ctl_bus);
  66}
  67