diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/ia64/ioperm.c')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/ia64/ioperm.c | 25 |
1 files changed, 5 insertions, 20 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/ia64/ioperm.c b/ports/sysdeps/unix/sysv/linux/ia64/ioperm.c index 83fc557f44..f2e5418d54 100644 --- a/ports/sysdeps/unix/sysv/linux/ia64/ioperm.c +++ b/ports/sysdeps/unix/sysv/linux/ia64/ioperm.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1999-2013 Free Software Foundation, Inc. +/* Copyright (C) 1999-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by David Mosberger-Tang <davidm@hpl.hp.com>. @@ -59,11 +59,7 @@ io_offset (unsigned long int port) int _ioperm (unsigned long int from, unsigned long int num, int turn_on) { -#if 0 - unsigned long int addr, len, base; -#endif unsigned long int base; - int prot; /* this test isn't as silly as it may look like; consider overflows! */ if (from >= MAX_PORT || from + num > MAX_PORT) @@ -91,14 +87,9 @@ _ioperm (unsigned long int from, unsigned long int num, int turn_on) return -1; len = io_offset (MAX_PORT); -#if 1 /* see comment below */ base = (unsigned long int) __mmap (0, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, phys_io_base); -#else - base = (unsigned long int) __mmap (0, len, PROT_NONE, MAP_SHARED, - fd, phys_io_base); -#endif __close (fd); if ((long) base == -1) @@ -106,25 +97,19 @@ _ioperm (unsigned long int from, unsigned long int num, int turn_on) io.base = base; } - prot = PROT_READ | PROT_WRITE; } else { if (!io.base) return 0; /* never was turned on... */ - - prot = PROT_NONE; } -#if 0 + /* We can't do mprotect because that would cause us to lose the uncached flag that the /dev/mem driver turned on. A MAP_UNCACHED - flag seems so much cleaner... */ - addr = (io.base + io_offset (from)) & io.page_mask; - len = io.base + io_offset (from + num) - addr; - return mprotect ((void *) addr, len, prot); -#else + flag seems so much cleaner... + + See the history of this file for a version that tried mprotect. */ return 0; -#endif } int |