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   1 /*
   2  *  linux/arch/arm/kernel/isa.c
   3  *
   4  *  Copyright (C) 1999 Phil Blundell
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  *  ISA shared memory and I/O port support, and is required to support
  12  *  iopl, inb, outb and friends in userspace via glibc emulation.
  13  */
  14 #include <linux/stddef.h>
  15 #include <linux/types.h>
  16 #include <linux/fs.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/init.h>
  19
  20 static unsigned int isa_membase, isa_portbase, isa_portshift;
  21
  22 static ctl_table ctl_isa_vars[4] = {
  23         {
  24                 .ctl_name       = BUS_ISA_MEM_BASE,
  25                 .procname       = "membase",
  26                 .data           = &isa_membase,
  27                 .maxlen         = sizeof(isa_membase),
  28                 .mode           = 0444,
  29                 .proc_handler   = &proc_dointvec,
  30         }, {
  31                 .ctl_name       = BUS_ISA_PORT_BASE,
  32                 .procname       = "portbase",
  33                 .data           = &isa_portbase,
  34                 .maxlen         = sizeof(isa_portbase),
  35                 .mode           = 0444,
  36                 .proc_handler   = &proc_dointvec,
  37         }, {
  38                 .ctl_name       = BUS_ISA_PORT_SHIFT,
  39                 .procname       = "portshift",
  40                 .data           = &isa_portshift,
  41                 .maxlen         = sizeof(isa_portshift),
  42                 .mode           = 0444,
  43                 .proc_handler   = &proc_dointvec,
  44         }, {0}
  45 };
  46
  47 static struct ctl_table_header *isa_sysctl_header;
  48
  49 static ctl_table ctl_isa[2] = {
  50         {
  51                 .ctl_name       = CTL_BUS_ISA,
  52                 .procname       = "isa",
  53                 .mode           = 0555,
  54                 .child          = ctl_isa_vars,
  55         }, {0}
  56 };
  57
  58 static ctl_table ctl_bus[2] = {
  59         {
  60                 .ctl_name       = CTL_BUS,
  61                 .procname       = "bus",
  62                 .mode           = 0555,
  63                 .child          = ctl_isa,
  64         }, {0}
  65 };
  66
  67 void __init
  68 register_isa_ports(unsigned int membase, unsigned int portbase, unsigned int portshift)
  69 {
  70         isa_membase = membase;
  71         isa_portbase = portbase;
  72         isa_portshift = portshift;
  73         isa_sysctl_header = register_sysctl_table(ctl_bus, 0);
  74 }