diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/ioperm.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/ioperm.c | 160 |
1 files changed, 32 insertions, 128 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/ioperm.c b/sysdeps/unix/sysv/linux/arm/ioperm.c index 0e338c4504..e832a6605e 100644 --- a/sysdeps/unix/sysv/linux/arm/ioperm.c +++ b/sysdeps/unix/sysv/linux/arm/ioperm.c @@ -17,167 +17,71 @@ 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; -} +#include <shlib-compat.h> + +#if SHLIB_COMPAT (libc, GLIBC_2_4, GLIBC_2_30) +# include <errno.h> int -_ioperm (unsigned long int from, unsigned long int num, int turn_on) +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; + __set_errno (ENOSYS); + return -1; } - +compat_symbol (libc, ioperm, ioperm, GLIBC_2_4); int -_iopl (unsigned int level) +iopl (unsigned int level) { - if (level > 3) - { - __set_errno (EINVAL); - return -1; - } - if (level) - { - return _ioperm (0, MAX_PORT, 1); - } - return 0; + __set_errno (ENOSYS); + return -1; } +compat_symbol (libc, iopl, iopl, GLIBC_2_4); + +/* The remaining functions do not have any way to indicate failure. + However, it is only valid to call them after calling ioperm/iopl, + which will have indicated failure. */ void -_outb (unsigned char b, unsigned long int port) +outb (unsigned char b, unsigned long int port) { - *((volatile unsigned char *)(IO_ADDR (port))) = b; } - +compat_symbol (libc, outb, outb, GLIBC_2_4); void -_outw (unsigned short b, unsigned long int port) +outw (unsigned short b, unsigned long int port) { - *((volatile unsigned short *)(IO_ADDR (port))) = b; } - +compat_symbol (libc, outw, outw, GLIBC_2_4); void -_outl (unsigned int b, unsigned long int port) +outl (unsigned int b, unsigned long int port) { - *((volatile unsigned long *)(IO_ADDR (port))) = b; } - +compat_symbol (libc, outl, outl, GLIBC_2_4); unsigned int -_inb (unsigned long int port) +inb (unsigned long int port) { - return *((volatile unsigned char *)(IO_ADDR (port))); + return 0; } +compat_symbol (libc, inb, inb, GLIBC_2_4); unsigned int -_inw (unsigned long int port) +inw (unsigned long int port) { - return *((volatile unsigned short *)(IO_ADDR (port))); + return 0; } +compat_symbol (libc, inw, inw, GLIBC_2_4); unsigned int -_inl (unsigned long int port) +inl (unsigned long int port) { - return *((volatile unsigned long *)(IO_ADDR (port))); + return 0; } +compat_symbol (libc, inl, inl, GLIBC_2_4); -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); +#endif /* SHLIB_COMAT */ |