diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tile/sched_getcpu.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/tile/sched_getcpu.c | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/sysdeps/unix/sysv/linux/tile/sched_getcpu.c b/sysdeps/unix/sysv/linux/tile/sched_getcpu.c deleted file mode 100644 index 06b6f60b55..0000000000 --- a/sysdeps/unix/sysv/linux/tile/sched_getcpu.c +++ /dev/null @@ -1,87 +0,0 @@ -/* Copyright (C) 2012-2018 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); -} |