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Linux/Alpha sysconf definitions.
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Ulrich Drepper
parent
58ed091a43
commit
8dbe95aa6a
152
sysdeps/unix/sysv/linux/alpha/sysconf.c
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152
sysdeps/unix/sysv/linux/alpha/sysconf.c
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/* Copyright (C) 2004 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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static long int linux_sysconf (int name);
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#define CSHAPE(totalsize, linesize, assoc) \
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((totalsize & ~0xff) | (linesize << 4) | assoc)
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long __libc_alpha_cache_shape[4] = { -2, -2, -2, -2 };
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static inline unsigned long
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implver (void)
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{
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unsigned long i;
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#if __GNUC_PREREQ(3,3)
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i = __builtin_alpha_implver ();
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#else
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asm ("implver %0" : "=r" (i));
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#endif
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return i;
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}
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static inline unsigned long
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amask (unsigned long x)
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{
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unsigned long r;
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#if __GNUC_PREREQ(3,3)
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r = __builtin_alpha_amask (x);
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#else
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asm ("amask %1,%0" : "=r"(r) : "Ir"(x));
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#endif
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return r;
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}
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/* Get the value of the system variable NAME. */
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long int
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__sysconf (int name)
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{
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long shape, index;
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/* We only handle the cache information here (for now). */
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if (name < _SC_LEVEL1_ICACHE_SIZE || name > _SC_LEVEL4_CACHE_LINESIZE)
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return linux_sysconf (name);
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/* No Alpha has L4 caches. */
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if (name >= _SC_LEVEL4_CACHE_SIZE)
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return -1;
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index = (name - _SC_LEVEL1_ICACHE_SIZE) / 3;
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shape = __libc_alpha_cache_shape[index];
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if (shape == -2)
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{
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long shape_l1i, shape_l1d, shape_l2, shape_l3 = -1;
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/* ??? In the cases below for which we do not know L1 cache sizes,
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we could do timings to measure sizes. But for the Bcache, it's
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generally big enough that (without additional help) TLB effects
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get in the way. We'd either need to be able to allocate large
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pages or have the kernel do the timings from KSEG. Fortunately,
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kernels beginning with 2.6.5 will pass us this info in auxvec. */
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switch (implver())
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{
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case 0: /* EV4 */
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/* EV4/LCA45 had 8k L1 caches; EV45 had 16k L1 caches. */
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/* EV4/EV45 had 128k to 16M 32-byte direct Bcache. LCA45
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had 64k to 8M 8-byte direct Bcache. Can't tell. */
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shape_l1i = shape_l1d = shape_l2 = CSHAPE (0, 5, 1);
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break;
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case 1: /* EV5 */
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if (amask (1 << 8))
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{
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/* MAX insns not present; either EV5 or EV56. */
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shape_l1i = shape_l1d = CSHAPE(8*1024, 5, 1);
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/* ??? L2 and L3 *can* be configured as 32-byte line. */
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shape_l2 = CSHAPE (96*1024, 6, 3);
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/* EV5/EV56 has 1M to 16M Bcache. */
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shape_l3 = CSHAPE (0, 6, 1);
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}
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else
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{
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/* MAX insns present; either PCA56 or PCA57. */
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/* PCA56 had 16k 64-byte cache; PCA57 had 32k Icache. */
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/* PCA56 had 8k 64-byte cache; PCA57 had 16k Dcache. */
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/* PCA5[67] had 512k to 4M Bcache. */
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shape_l1i = shape_l1d = shape_l2 = CSHAPE (0, 6, 1);
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}
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break;
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case 2: /* EV6 */
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shape_l1i = shape_l1d = CSHAPE(64*1024, 6, 2);
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/* EV6/EV67/EV68* had 1M to 16M Bcache. */
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shape_l2 = CSHAPE (0, 6, 1);
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break;
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case 3: /* EV7 */
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shape_l1i = shape_l1d = CSHAPE(64*1024, 6, 2);
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shape_l2 = CSHAPE(7*1024*1024/4, 6, 7);
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break;
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default:
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shape_l1i = shape_l1d = shape_l2 = 0;
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break;
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}
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__libc_alpha_cache_shape[0] = shape_l1i;
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__libc_alpha_cache_shape[1] = shape_l1d;
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__libc_alpha_cache_shape[2] = shape_l2;
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__libc_alpha_cache_shape[3] = shape_l3;
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shape = __libc_alpha_cache_shape[index];
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}
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if (shape <= 0)
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return shape;
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switch (name % 3)
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{
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case 0: /* total size */
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return shape & -0x100;
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case 1: /* associativity */
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return shape & 0xf;
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default: /* line size */
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return 1L << ((shape >> 4) & 0xf);
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}
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}
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/* Now the generic Linux version. */
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#undef __sysconf
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#define __sysconf static linux_sysconf
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#include "../sysconf.c"
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