diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/ioperm.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/ioperm.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/ioperm.c b/sysdeps/unix/sysv/linux/arm/ioperm.c deleted file mode 100644 index c1fedd3696..0000000000 --- a/sysdeps/unix/sysv/linux/arm/ioperm.c +++ /dev/null @@ -1,183 +0,0 @@ -/* Copyright (C) 1998-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Phil Blundell, based on the Alpha version by - David Mosberger. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library. If not, see - <http://www.gnu.org/licenses/>. */ - -/* I/O port access on the ARM is something of a fiction. What we do is to - map an appropriate area of /dev/mem into user space so that a program - can blast away at the hardware in such a way as to generate I/O cycles - on the bus. To insulate user code from dependencies on particular - hardware we don't allow calls to inb() and friends to be inlined, but - force them to come through code in here every time. Performance-critical - registers tend to be memory mapped these days so this should be no big - problem. */ - -/* Once upon a time this file used mprotect to enable and disable - access to particular areas of I/O space. Unfortunately the - mprotect syscall also has the side effect of enabling caching for - the area affected (this is a kernel limitation). So we now just - enable all the ports all of the time. */ - -#include <errno.h> -#include <fcntl.h> -#include <stdio.h> -#include <ctype.h> -#include <stdlib.h> -#include <unistd.h> - -#include <sys/types.h> -#include <sys/mman.h> - -#include <sys/sysctl.h> - -#define MAX_PORT 0x10000 - -static struct { - unsigned long int base; - unsigned long int io_base; - unsigned int shift; - unsigned int initdone; /* since all the above could be 0 */ -} io; - -#define IO_ADDR(port) (io.base + ((port) << io.shift)) - -/* - * Initialize I/O system. The io_bae and port_shift values are fetched - * using sysctl (CTL_BUS, CTL_BUS_ISA, ISA_*). - */ - -static int -init_iosys (void) -{ - static int iobase_name[] = { CTL_BUS, CTL_BUS_ISA, BUS_ISA_PORT_BASE }; - static int ioshift_name[] = { CTL_BUS, CTL_BUS_ISA, BUS_ISA_PORT_SHIFT }; - size_t len = sizeof(io.base); - - if (! __sysctl (iobase_name, 3, &io.io_base, &len, NULL, 0) - && ! __sysctl (ioshift_name, 3, &io.shift, &len, NULL, 0)) - { - io.initdone = 1; - return 0; - } - - /* sysctl has failed... */ - __set_errno (ENODEV); - return -1; -} - -int -_ioperm (unsigned long int from, unsigned long int num, int turn_on) -{ - if (! io.initdone && init_iosys () < 0) - return -1; - - /* this test isn't as silly as it may look like; consider overflows! */ - if (from >= MAX_PORT || from + num > MAX_PORT) - { - __set_errno (EINVAL); - return -1; - } - - if (turn_on) - { - if (! io.base) - { - int fd; - - fd = __open ("/dev/mem", O_RDWR); - if (fd < 0) - return -1; - - io.base = - (unsigned long int) __mmap (0, MAX_PORT << io.shift, - PROT_READ | PROT_WRITE, - MAP_SHARED, fd, io.io_base); - __close (fd); - if ((long) io.base == -1) - return -1; - } - } - - return 0; -} - - -int -_iopl (unsigned int level) -{ - if (level > 3) - { - __set_errno (EINVAL); - return -1; - } - if (level) - { - return _ioperm (0, MAX_PORT, 1); - } - return 0; -} - - -void -_outb (unsigned char b, unsigned long int port) -{ - *((volatile unsigned char *)(IO_ADDR (port))) = b; -} - - -void -_outw (unsigned short b, unsigned long int port) -{ - *((volatile unsigned short *)(IO_ADDR (port))) = b; -} - - -void -_outl (unsigned int b, unsigned long int port) -{ - *((volatile unsigned long *)(IO_ADDR (port))) = b; -} - - -unsigned int -_inb (unsigned long int port) -{ - return *((volatile unsigned char *)(IO_ADDR (port))); -} - - -unsigned int -_inw (unsigned long int port) -{ - return *((volatile unsigned short *)(IO_ADDR (port))); -} - - -unsigned int -_inl (unsigned long int port) -{ - return *((volatile unsigned long *)(IO_ADDR (port))); -} - -weak_alias (_ioperm, ioperm); -weak_alias (_iopl, iopl); -weak_alias (_inb, inb); -weak_alias (_inw, inw); -weak_alias (_inl, inl); -weak_alias (_outb, outb); -weak_alias (_outw, outw); -weak_alias (_outl, outl); |