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
  17 static unsigned int isa_membase, isa_portbase, isa_portshift;
  18
  19 static 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
  41 static struct ctl_table_header *isa_sysctl_header;
  42
  43 static struct ctl_table ctl_isa[2] = {
  44         {
  45                 .procname       = "isa",
  46                 .mode           = 0555,
  47                 .child          = ctl_isa_vars,
  48         }, {}
  49 };
  50
  51 static struct ctl_table ctl_bus[2] = {
  52         {
  53                 .procname       = "bus",
  54                 .mode           = 0555,
  55                 .child          = ctl_isa,
  56         }, {}
  57 };
  58
  59 void __init
  60 register_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 }