mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 02:40:06 +00:00
4372980f58
I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure. Beyond the README
update, the move was just
git mv ports/sysdeps/tile sysdeps/tile
git mv ports/sysdeps/unix/sysv/linux/tile \
sysdeps/unix/sysv/linux/tile
git mv ports/sysdeps/unix/sysv/linux/generic \
sysdeps/unix/sysv/linux/generic
I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d7 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* Copyright (C) 2012-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sched.h>
|
|
#include <sysdep.h>
|
|
#include <arch/spr_def.h>
|
|
|
|
|
|
/* The count of cores horizontally (X dimension) on the chip. */
|
|
static int chip_width;
|
|
|
|
/* Read the chip "width" from the /sys filesystem. */
|
|
static int
|
|
initialize_chip_width (void)
|
|
{
|
|
int w = 0;
|
|
int fd;
|
|
|
|
fd = __open ("/sys/devices/system/cpu/chip_width", O_RDONLY);
|
|
if (fd >= 0)
|
|
{
|
|
char buf[64];
|
|
ssize_t n;
|
|
int i;
|
|
|
|
n = __read (fd, buf, sizeof (buf));
|
|
__close (fd);
|
|
|
|
for (i = 0; i < n; ++i)
|
|
{
|
|
if (buf[i] < '0' || buf[i] > '9')
|
|
break;
|
|
w = (w * 10) + (buf[i] - '0');
|
|
}
|
|
}
|
|
|
|
/* Store a negative value so we don't try again. */
|
|
if (w == 0)
|
|
w = -1;
|
|
|
|
/* Using an atomic idempotent write here makes this thread-safe. */
|
|
chip_width = w;
|
|
return w;
|
|
}
|
|
|
|
int
|
|
sched_getcpu (void)
|
|
{
|
|
unsigned int coord;
|
|
int w = chip_width;
|
|
|
|
if (__builtin_expect (w <= 0, 0))
|
|
{
|
|
if (w == 0)
|
|
w = initialize_chip_width ();
|
|
if (w < 0)
|
|
{
|
|
unsigned int cpu;
|
|
int r = INLINE_SYSCALL (getcpu, 3, &cpu, NULL, NULL);
|
|
return r == -1 ? r : cpu;
|
|
}
|
|
}
|
|
|
|
/* Assign 64-bit value to a 32-bit variable to ensure 32-bit multiply. */
|
|
coord = __insn_mfspr (SPR_TILE_COORD);
|
|
|
|
/* Extract Y coord from bits 7..10 and X coord from bits 18..21. */
|
|
return ((coord >> 7) & 0xf) * w + ((coord >> 18) & 0xf);
|
|
}
|