From 24d1d8ec9e529ed66c49e17366fe5a889d483670 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed, 13 Dec 2017 11:43:39 -0200
Subject: Simplify tilegx sysdeps folder
With tilepro support removal we can now simplify internal tile support by
moving the directory structure to avoid the unnecessary directory levels
in tile/tilegx both on generic and linux folders.
Checked with a build for tilegx-linux-gnu and tilegx-linux-gnu-32 with
and without the patch, there is no difference in generated binary with
a dissassemble.
* stdlib/bug-getcontext.c (do_test): Remove tilepro mention in
comment.
* sysdeps/tile/preconfigure: Remove tilegx folder.
* sysdeps/tile/tilegx/Implies: Move definitions to ...
* sysdeps/tile/Implies: ... here.
* sysdeps/tile/tilegx/Makefile: Move rules to ...
* sysdeps/tile/Makefile: ... here.
* sysdeps/tile/tilegx/atomic-machine.h: Move definitions to ...
* sysdeps/tile/atomic-machine.h: ... here. Add include guards.
* sysdeps/tile/tilegx/bits/wordsize.h: Move to ...
* sysdeps/tile/bits/wordsize.h: ... here.
* sysdeps/tile/tilegx/*: Move to ...
* sysdeps/tile/*: ... here.
* sysdeps/tile/tilegx/tilegx32/Implies: Move to ...
* sysdeps/tile/tilegx32/Implies: ... here.
* sysdeps/tile/tilegx/tilegx64/Implies: Move to ...
* sysdeps/tile/tilegx64/Implies: ... here.
* sysdeps/unix/sysv/linux/tile/tilegx/Makefile: Move definitions
to ...
* sysdeps/unix/sysv/linux/tile/Makefile: ... here.
* sysdeps/unix/sysv/linux/tile/tilegx/*: Move to ...
* sysdeps/unix/sysv/linux/tile/*: ... here.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/*: Move to ...
* sysdeps/unix/sysv/linux/tile/tilegx32/*: ... here.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/*: Move to ...
* sysdeps/unix/sysv/linux/tile/tilegx64/*: ... here.
---
sysdeps/unix/sysv/linux/tile/sched_getcpu.c | 87 +++++++++++++++++++++++++++++
1 file changed, 87 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/tile/sched_getcpu.c
(limited to 'sysdeps/unix/sysv/linux/tile/sched_getcpu.c')
diff --git a/sysdeps/unix/sysv/linux/tile/sched_getcpu.c b/sysdeps/unix/sysv/linux/tile/sched_getcpu.c
new file mode 100644
index 0000000000..807913c7d1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tile/sched_getcpu.c
@@ -0,0 +1,87 @@
+/* Copyright (C) 2012-2017 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);
+}
--
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