| /* Copyright (C) 2004-2014 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 <assert.h> |
| #include <stdbool.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| |
| static long int linux_sysconf (int name); |
| |
| #define CSHAPE(totalsize, linesize, assoc) \ |
| ((totalsize & ~0xff) | (linesize << 4) | assoc) |
| |
| extern long __libc_alpha_cache_shape[4]; |
| |
| /* Get the value of the system variable NAME. */ |
| long int |
| __sysconf (int name) |
| { |
| long shape, index; |
| |
| /* We only handle the cache information here (for now). */ |
| if (name < _SC_LEVEL1_ICACHE_SIZE || name > _SC_LEVEL4_CACHE_LINESIZE) |
| return linux_sysconf (name); |
| |
| /* No Alpha has L4 caches. */ |
| if (name >= _SC_LEVEL4_CACHE_SIZE) |
| return -1; |
| |
| index = (name - _SC_LEVEL1_ICACHE_SIZE) / 3; |
| shape = __libc_alpha_cache_shape[index]; |
| if (shape == -2) |
| { |
| long shape_l1i, shape_l1d, shape_l2, shape_l3 = -1; |
| |
| /* ??? In the cases below for which we do not know L1 cache sizes, |
| we could do timings to measure sizes. But for the Bcache, it's |
| generally big enough that (without additional help) TLB effects |
| get in the way. We'd either need to be able to allocate large |
| pages or have the kernel do the timings from KSEG. Fortunately, |
| kernels beginning with 2.6.5 will pass us this info in auxvec. */ |
| |
| switch (__builtin_alpha_implver ()) |
| { |
| case 0: /* EV4 */ |
| /* EV4/LCA45 had 8k L1 caches; EV45 had 16k L1 caches. */ |
| /* EV4/EV45 had 128k to 16M 32-byte direct Bcache. LCA45 |
| had 64k to 8M 8-byte direct Bcache. Can't tell. */ |
| shape_l1i = shape_l1d = shape_l2 = CSHAPE (0, 5, 1); |
| break; |
| |
| case 1: /* EV5 */ |
| if (__builtin_alpha_amask (1 << 8)) |
| { |
| /* MAX insns not present; either EV5 or EV56. */ |
| shape_l1i = shape_l1d = CSHAPE(8*1024, 5, 1); |
| /* ??? L2 and L3 *can* be configured as 32-byte line. */ |
| shape_l2 = CSHAPE (96*1024, 6, 3); |
| /* EV5/EV56 has 1M to 16M Bcache. */ |
| shape_l3 = CSHAPE (0, 6, 1); |
| } |
| else |
| { |
| /* MAX insns present; either PCA56 or PCA57. */ |
| /* PCA56 had 16k 64-byte cache; PCA57 had 32k Icache. */ |
| /* PCA56 had 8k 64-byte cache; PCA57 had 16k Dcache. */ |
| /* PCA5[67] had 512k to 4M Bcache. */ |
| shape_l1i = shape_l1d = shape_l2 = CSHAPE (0, 6, 1); |
| } |
| break; |
| |
| case 2: /* EV6 */ |
| shape_l1i = shape_l1d = CSHAPE(64*1024, 6, 2); |
| /* EV6/EV67/EV68* had 1M to 16M Bcache. */ |
| shape_l2 = CSHAPE (0, 6, 1); |
| break; |
| |
| case 3: /* EV7 */ |
| shape_l1i = shape_l1d = CSHAPE(64*1024, 6, 2); |
| shape_l2 = CSHAPE(7*1024*1024/4, 6, 7); |
| break; |
| |
| default: |
| shape_l1i = shape_l1d = shape_l2 = 0; |
| break; |
| } |
| |
| __libc_alpha_cache_shape[0] = shape_l1i; |
| __libc_alpha_cache_shape[1] = shape_l1d; |
| __libc_alpha_cache_shape[2] = shape_l2; |
| __libc_alpha_cache_shape[3] = shape_l3; |
| shape = __libc_alpha_cache_shape[index]; |
| } |
| |
| if (shape <= 0) |
| return shape; |
| |
| switch ((name - _SC_LEVEL1_ICACHE_SIZE) % 3) |
| { |
| case 0: /* total size */ |
| return shape & -0x100; |
| case 1: /* associativity */ |
| return shape & 0xf; |
| default: /* line size */ |
| return 1L << ((shape >> 4) & 0xf); |
| } |
| } |
| |
| /* Now the generic Linux version. */ |
| #undef __sysconf |
| #define __sysconf static linux_sysconf |
| #include <sysdeps/unix/sysv/linux/sysconf.c> |