diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/ioperm.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/ioperm.c | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/ioperm.c b/sysdeps/unix/sysv/linux/arm/ioperm.c deleted file mode 100644 index 558b485b61..0000000000 --- a/sysdeps/unix/sysv/linux/arm/ioperm.c +++ /dev/null @@ -1,274 +0,0 @@ -/* Copyright (C) 1998, 1999, 2003 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* 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 <string.h> -#include <unistd.h> - -#include <sys/types.h> -#include <sys/mman.h> - -#include <asm/page.h> -#include <sys/sysctl.h> - -#define PATH_ARM_SYSTYPE "/etc/arm_systype" -#define PATH_CPUINFO "/proc/cpuinfo" - -#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_BASE_FOOTBRIDGE 0x7c000000 -#define IO_SHIFT_FOOTBRIDGE 0 - -static struct platform { - const char *name; - unsigned long int io_base; - unsigned int shift; -} platform[] = { - /* All currently supported platforms are in fact the same. :-) */ - {"Chalice-CATS", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE}, - {"DEC-EBSA285", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE}, - {"Corel-NetWinder", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE}, - {"Rebel-NetWinder", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE}, -}; - -#define IO_ADDR(port) (io.base + ((port) << io.shift)) - -/* - * Initialize I/O system. There are several ways to get the information - * we need. Each is tried in turn until one succeeds. - * - * 1. Sysctl (CTL_BUS, BUS_ISA, ISA_*). This is the preferred method - * but not all kernels support it. - * - * 2. Read the value (not the contents) of symlink PATH_ARM_SYSTYPE. - * - If it matches one of the entries in the table above, use the - * corresponding values. - * - If it begins with a number, assume this is a previously - * unsupported system and the values encode, in order, - * "<io_base>,<port_shift>". - * - * 3. Lookup the "system type" field in /proc/cpuinfo. Again, if it - * matches an entry in the platform[] table, use the corresponding - * values. - */ - -static int -init_iosys (void) -{ - char systype[256]; - int i, n; - static int iobase_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_BASE }; - static int ioshift_name[] = { CTL_BUS, 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; - } - - n = readlink (PATH_ARM_SYSTYPE, systype, sizeof (systype) - 1); - if (n > 0) - { - systype[n] = '\0'; - if (isdigit (systype[0])) - { - if (sscanf (systype, "%li,%i", &io.io_base, &io.shift) == 2) - { - io.initdone = 1; - return 0; - } - /* else we're likely going to fail with the system match below */ - } - } - else - { - FILE * fp; - - fp = fopen (PATH_CPUINFO, "r"); - if (! fp) - return -1; - while ((n = fscanf (fp, "Hardware\t: %256[^\n]\n", systype)) - != EOF) - { - if (n == 1) - break; - else - fgets (systype, 256, fp); - } - fclose (fp); - - if (n == EOF) - { - /* this can happen if the format of /proc/cpuinfo changes... */ - fprintf (stderr, - "ioperm: Unable to determine system type.\n" - "\t(May need " PATH_ARM_SYSTYPE " symlink?)\n"); - __set_errno (ENODEV); - return -1; - } - } - - /* translate systype name into i/o system: */ - for (i = 0; i < sizeof (platform) / sizeof (platform[0]); ++i) - { - if (strcmp (platform[i].name, systype) == 0) - { - io.shift = platform[i].shift; - io.io_base = platform[i].io_base; - io.initdone = 1; - return 0; - } - } - - /* systype is not a known platform name... */ - __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); |