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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
201 lines
4.6 KiB
C
201 lines
4.6 KiB
C
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* I/O access is restricted to ISA port space (ports 0..65535).
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Modern devices hopefully are sane enough not to put any performance
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critical registers in i/o space.
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On the first call to ioperm() or iopl(), the entire (E)ISA port
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space is mapped into the virtual address space at address io.base.
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mprotect() calls are then used to enable/disable access to ports.
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Per 4KB page, there are 4 I/O ports. */
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#include <errno.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#define MAX_PORT 0x10000
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/*
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* Memory fence w/accept. This should never be used in code that is
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* not IA-64 specific.
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*/
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#define __ia64_mf_a() __asm__ __volatile__ ("mf.a" ::: "memory")
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static struct
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{
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unsigned long int base;
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unsigned long int page_mask;
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}
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io;
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__inline__ unsigned long int
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io_offset (unsigned long int port)
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{
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return ((port >> 2) << 12) | (port & 0xfff);
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}
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int
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_ioperm (unsigned long int from, unsigned long int num, int turn_on)
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{
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unsigned long int base;
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/* this test isn't as silly as it may look like; consider overflows! */
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if (from >= MAX_PORT || from + num > MAX_PORT)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (turn_on)
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{
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if (!io.base)
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{
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unsigned long phys_io_base, len;
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int fd;
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io.page_mask = ~(__getpagesize() - 1);
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/* get I/O base physical address from ar.k0 as per PRM: */
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__asm__ ("mov %0=ar.k0" : "=r"(phys_io_base));
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/* The O_SYNC flag tells the /dev/mem driver to map the
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memory uncached: */
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fd = __open ("/dev/mem", O_RDWR | O_SYNC);
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if (fd < 0)
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return -1;
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len = io_offset (MAX_PORT);
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/* see comment below */
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base = (unsigned long int) __mmap (0, len, PROT_READ | PROT_WRITE, MAP_SHARED,
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fd, phys_io_base);
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__close (fd);
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if ((long) base == -1)
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return -1;
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io.base = base;
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}
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}
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else
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{
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if (!io.base)
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return 0; /* never was turned on... */
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}
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/* We can't do mprotect because that would cause us to lose the
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uncached flag that the /dev/mem driver turned on. A MAP_UNCACHED
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flag seems so much cleaner...
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See the history of this file for a version that tried mprotect. */
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return 0;
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}
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int
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_iopl (unsigned int level)
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{
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if (level > 3)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (level)
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{
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int retval = _ioperm (0, MAX_PORT, 1);
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/* Match the documented error returns of the x86 version. */
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if (retval < 0 && errno == EACCES)
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__set_errno (EPERM);
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return retval;
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}
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return 0;
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}
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unsigned int
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_inb (unsigned long int port)
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{
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volatile unsigned char *addr = (void *) io.base + io_offset (port);
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unsigned char ret;
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ret = *addr;
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__ia64_mf_a();
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return ret;
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}
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unsigned int
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_inw (unsigned long int port)
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{
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volatile unsigned short *addr = (void *) io.base + io_offset (port);
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unsigned short ret;
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ret = *addr;
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__ia64_mf_a();
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return ret;
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}
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unsigned int
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_inl (unsigned long int port)
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{
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volatile unsigned int *addr = (void *) io.base + io_offset (port);
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unsigned int ret;
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ret = *addr;
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__ia64_mf_a();
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return ret;
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}
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void
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_outb (unsigned char val, unsigned long int port)
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{
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volatile unsigned char *addr = (void *) io.base + io_offset (port);
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*addr = val;
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__ia64_mf_a();
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}
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void
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_outw (unsigned short val, unsigned long int port)
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{
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volatile unsigned short *addr = (void *) io.base + io_offset (port);
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*addr = val;
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__ia64_mf_a();
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}
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void
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_outl (unsigned int val, unsigned long int port)
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{
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volatile unsigned int *addr = (void *) io.base + io_offset (port);
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*addr = val;
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__ia64_mf_a();
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}
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weak_alias (_ioperm, ioperm);
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weak_alias (_iopl, iopl);
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weak_alias (_inb, inb);
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weak_alias (_inw, inw);
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weak_alias (_inl, inl);
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weak_alias (_outb, outb);
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weak_alias (_outw, outw);
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weak_alias (_outl, outl);
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