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 void __init 44 register_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