tile: add support for _SC_LEVEL*CACHE* sysconf() queries

ChangeLog

@@ -1,5 +1,7 @@
 2014-10-02  Chris Metcalf  <cmetcalf@tilera.com>
 
+	* sysdeps/unix/sysv/linux/tile/sysconf.c: New file.
+
 	* sysdeps/tile/tilegx/string-endian.h (STRSHIFT): New macro.
 	* sysdeps/tile/tilegx/strcasestr.c: New file.
 	* sysdeps/tile/tilegx/strnlen.c: New file.

sysdeps/unix/sysv/linux/tile/sysconf.c

@@ -0,0 +1,75 @@
+/* Copyright (C) 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 <unistd.h>
+#include <sys/sysinfo.h>
+#include <arch/chip.h>
+
+static long int linux_sysconf (int name);
+
+/* Get the value of the system variable NAME.  */
+long int
+__sysconf (int name)
+{
+  /* Currently we support only tilepro and tilegx, which have
+     statically-known cache sizes.  */
+  switch (name)
+    {
+    /* Level 1 cache.  */
+    case _SC_LEVEL1_ICACHE_SIZE:
+      return CHIP_L1I_CACHE_SIZE();
+    case _SC_LEVEL1_ICACHE_ASSOC:
+      return CHIP_L1I_ASSOC();
+    case _SC_LEVEL1_ICACHE_LINESIZE:
+      return CHIP_L1I_LINE_SIZE();
+    case _SC_LEVEL1_DCACHE_SIZE:
+      return CHIP_L1D_CACHE_SIZE();
+    case _SC_LEVEL1_DCACHE_ASSOC:
+      return CHIP_L1D_ASSOC();
+    case _SC_LEVEL1_DCACHE_LINESIZE:
+      return CHIP_L1D_LINE_SIZE();
+
+    /* Level 2 cache.  */
+    case _SC_LEVEL2_CACHE_SIZE:
+      return CHIP_L2_CACHE_SIZE();
+    case _SC_LEVEL2_CACHE_ASSOC:
+      return CHIP_L2_ASSOC();
+    case _SC_LEVEL2_CACHE_LINESIZE:
+      return CHIP_L2_LINE_SIZE();
+
+    /* Level 3 cache is layered on level 2 cache.  */
+    case _SC_LEVEL3_CACHE_SIZE:
+      return CHIP_L2_CACHE_SIZE() * __get_nprocs();
+    case _SC_LEVEL3_CACHE_ASSOC:
+      return CHIP_L2_ASSOC();
+    case _SC_LEVEL3_CACHE_LINESIZE:
+      return CHIP_L2_LINE_SIZE();
+
+    /* No level 4 cache.  */
+    case _SC_LEVEL4_CACHE_SIZE:
+    case _SC_LEVEL4_CACHE_ASSOC:
+    case _SC_LEVEL4_CACHE_LINESIZE:
+      return -1;
+    }
+
+  return linux_sysconf (name);
+}
+
+/* Now the generic Linux version.  */
+#undef __sysconf
+#define __sysconf static linux_sysconf
+#include <sysdeps/unix/sysv/linux/sysconf.c>