diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/bits/confname.h | 37 | ||||
| -rw-r--r-- | sysdeps/posix/sysconf.c | 19 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysconf.c | 304 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysconf.c | 10 |
4 files changed, 364 insertions, 6 deletions
diff --git a/sysdeps/generic/bits/confname.h b/sysdeps/generic/bits/confname.h index a12edab698..d097a4ba1a 100644 --- a/sysdeps/generic/bits/confname.h +++ b/sysdeps/generic/bits/confname.h @@ -1,5 +1,6 @@ /* `sysconf', `pathconf', and `confstr' NAME values. Generic version. - Copyright (C) 1993,1995-1998,2000,2001,2003 Free Software Foundation, Inc. + Copyright (C) 1993,1995-1998,2000,2001,2003,2004 + 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 @@ -460,8 +461,40 @@ enum #define _SC_TRACE_EVENT_FILTER _SC_TRACE_EVENT_FILTER _SC_TRACE_INHERIT, #define _SC_TRACE_INHERIT _SC_TRACE_INHERIT - _SC_TRACE_LOG + _SC_TRACE_LOG, #define _SC_TRACE_LOG _SC_TRACE_LOG + + _SC_LEVEL1_ICACHE_SIZE, +#define _SC_LEVEL1_ICACHE_SIZE _SC_LEVEL1_ICACHE_SIZE + _SC_LEVEL1_ICACHE_ASSOC, +#define _SC_LEVEL1_ICACHE_ASSOC _SC_LEVEL1_ICACHE_ASSOC + _SC_LEVEL1_ICACHE_LINESIZE, +#define _SC_LEVEL1_ICACHE_LINESIZE _SC_LEVEL1_ICACHE_LINESIZE + _SC_LEVEL1_DCACHE_SIZE, +#define _SC_LEVEL1_DCACHE_SIZE _SC_LEVEL1_DCACHE_SIZE + _SC_LEVEL1_DCACHE_ASSOC, +#define _SC_LEVEL1_DCACHE_ASSOC _SC_LEVEL1_DCACHE_ASSOC + _SC_LEVEL1_DCACHE_LINESIZE, +#define _SC_LEVEL1_DCACHE_LINESIZE _SC_LEVEL1_DCACHE_LINESIZE + _SC_LEVEL2_CACHE_SIZE, +#define _SC_LEVEL2_CACHE_SIZE _SC_LEVEL2_CACHE_SIZE + _SC_LEVEL2_CACHE_ASSOC, +#define _SC_LEVEL2_CACHE_ASSOC _SC_LEVEL2_CACHE_ASSOC + _SC_LEVEL2_CACHE_LINESIZE, +#define _SC_LEVEL2_CACHE_LINESIZE _SC_LEVEL2_CACHE_LINESIZE + _SC_LEVEL3_CACHE_SIZE, +#define _SC_LEVEL3_CACHE_SIZE _SC_LEVEL3_CACHE_SIZE + _SC_LEVEL3_CACHE_ASSOC, +#define _SC_LEVEL3_CACHE_ASSOC _SC_LEVEL3_CACHE_ASSOC + _SC_LEVEL3_CACHE_LINESIZE, +#define _SC_LEVEL3_CACHE_LINESIZE _SC_LEVEL3_CACHE_LINESIZE + _SC_LEVEL4_CACHE_SIZE, +#define _SC_LEVEL4_CACHE_SIZE _SC_LEVEL4_CACHE_SIZE + _SC_LEVEL4_CACHE_ASSOC, +#define _SC_LEVEL4_CACHE_ASSOC _SC_LEVEL4_CACHE_ASSOC + _SC_LEVEL4_CACHE_LINESIZE +#define _SC_LEVEL4_CACHE_LINESIZE _SC_LEVEL4_CACHE_LINESIZE + /* Leave room here, maybe we need a few more cache levels some day. */ }; /* Values for the NAME argument to `confstr'. */ diff --git a/sysdeps/posix/sysconf.c b/sysdeps/posix/sysconf.c index 584a44fb41..66f978ba3b 100644 --- a/sysdeps/posix/sysconf.c +++ b/sysdeps/posix/sysconf.c @@ -1164,6 +1164,25 @@ __sysconf (name) #else return -1; #endif + + case _SC_LEVEL1_ICACHE_SIZE: + case _SC_LEVEL1_ICACHE_ASSOC: + case _SC_LEVEL1_ICACHE_LINESIZE: + case _SC_LEVEL1_DCACHE_SIZE: + case _SC_LEVEL1_DCACHE_ASSOC: + case _SC_LEVEL1_DCACHE_LINESIZE: + case _SC_LEVEL2_CACHE_SIZE: + case _SC_LEVEL2_CACHE_ASSOC: + case _SC_LEVEL2_CACHE_LINESIZE: + case _SC_LEVEL3_CACHE_SIZE: + case _SC_LEVEL3_CACHE_ASSOC: + case _SC_LEVEL3_CACHE_LINESIZE: + case _SC_LEVEL4_CACHE_SIZE: + case _SC_LEVEL4_CACHE_ASSOC: + /* In general we cannot determine these values. Therefore we + return zero which indicates that no information is + available. */ + return 0; } } diff --git a/sysdeps/unix/sysv/linux/i386/sysconf.c b/sysdeps/unix/sysv/linux/i386/sysconf.c new file mode 100644 index 0000000000..067c752924 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/sysconf.c @@ -0,0 +1,304 @@ +/* Get file-specific information about a file. Linux version. + Copyright (C) 2003, 2004 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <assert.h> +#include <stdbool.h> +#include <stdlib.h> +#include <unistd.h> + + +static long int linux_sysconf (int name); + + +static long int +handle_i486 (int name) +{ + /* The processor only has a unified level 1 cache of 8k. */ + switch (name) + { + case _SC_LEVEL1_ICACHE_SIZE: + case _SC_LEVEL1_DCACHE_SIZE: + return 8 * 1024; + + case _SC_LEVEL1_ICACHE_ASSOC: + case _SC_LEVEL1_DCACHE_ASSOC: + // XXX Anybody know this? + return 0; + + case _SC_LEVEL1_ICACHE_LINESIZE: + case _SC_LEVEL1_DCACHE_LINESIZE: + // XXX Anybody know for sure? + return 16; + + case _SC_LEVEL2_CACHE_SIZE: + case _SC_LEVEL2_CACHE_ASSOC: + case _SC_LEVEL2_CACHE_LINESIZE: + case _SC_LEVEL3_CACHE_SIZE: + case _SC_LEVEL3_CACHE_ASSOC: + case _SC_LEVEL3_CACHE_LINESIZE: + case _SC_LEVEL4_CACHE_SIZE: + case _SC_LEVEL4_CACHE_ASSOC: + /* Not available. */ + break; + + default: + assert (! "cannot happen"); + } + + return -1; +} + + +static struct intel_02_cache_info +{ + unsigned int idx; + int name; + long int size; + long int assoc; + long int linesize; +} intel_02_known[] = + { + { 0x06, _SC_LEVEL1_ICACHE_SIZE, 8192, 4, 32 }, + { 0x08, _SC_LEVEL1_ICACHE_SIZE, 16384, 4, 32 }, + { 0x0a, _SC_LEVEL1_DCACHE_SIZE, 8192, 2, 32 }, + { 0x0c, _SC_LEVEL1_DCACHE_SIZE, 16384, 4, 32 }, + { 0x22, _SC_LEVEL3_CACHE_SIZE, 524288, 4, 64 }, + { 0x23, _SC_LEVEL3_CACHE_SIZE, 1048576, 8, 64 }, + { 0x25, _SC_LEVEL3_CACHE_SIZE, 2097152, 8, 64 }, + { 0x29, _SC_LEVEL3_CACHE_SIZE, 4194304, 8, 64 }, + { 0x2c, _SC_LEVEL1_DCACHE_SIZE, 32768, 8, 64 }, + { 0x30, _SC_LEVEL1_ICACHE_SIZE, 32768, 8, 64 }, + { 0x41, _SC_LEVEL2_CACHE_SIZE, 131072, 4, 32 }, + { 0x42, _SC_LEVEL2_CACHE_SIZE, 262144, 4, 32 }, + { 0x43, _SC_LEVEL2_CACHE_SIZE, 524288, 4, 32 }, + { 0x44, _SC_LEVEL2_CACHE_SIZE, 1048576, 4, 32 }, + { 0x45, _SC_LEVEL2_CACHE_SIZE, 2097152, 4, 32 }, + { 0x60, _SC_LEVEL1_DCACHE_SIZE, 16384, 8, 64 }, + { 0x66, _SC_LEVEL1_DCACHE_SIZE, 8192, 4, 64 }, + { 0x67, _SC_LEVEL1_DCACHE_SIZE, 16384, 4, 64 }, + { 0x68, _SC_LEVEL1_DCACHE_SIZE, 32768, 4, 64 }, + { 0x78, _SC_LEVEL2_CACHE_SIZE, 1048576, 8, 64 }, + { 0x79, _SC_LEVEL2_CACHE_SIZE, 131072, 8, 64 }, + { 0x7a, _SC_LEVEL2_CACHE_SIZE, 262144, 8, 64 }, + { 0x7b, _SC_LEVEL2_CACHE_SIZE, 524288, 8, 64 }, + { 0x7c, _SC_LEVEL2_CACHE_SIZE, 1048576, 8, 64 }, + { 0x7d, _SC_LEVEL2_CACHE_SIZE, 2097152, 8, 64 }, + { 0x82, _SC_LEVEL2_CACHE_SIZE, 262144, 8, 32 }, + { 0x83, _SC_LEVEL2_CACHE_SIZE, 524288, 8, 32 }, + { 0x84, _SC_LEVEL2_CACHE_SIZE, 1048576, 8, 32 }, + { 0x85, _SC_LEVEL2_CACHE_SIZE, 2097152, 8, 32 }, + { 0x86, _SC_LEVEL2_CACHE_SIZE, 524288, 4, 64 }, + { 0x87, _SC_LEVEL2_CACHE_SIZE, 1048576, 8, 64 }, + }; +#define nintel_02_known (sizeof (intel_02_known) / sizeof (intel_02_known[0])) + + +static int +intel_02_known_compare (const void *p1, const void *p2) +{ + const struct intel_02_cache_info *i1; + const struct intel_02_cache_info *i2; + + i1 = (const struct intel_02_cache_info *) p1; + i2 = (const struct intel_02_cache_info *) p2; + + if (i1->idx == i2->idx) + return 0; + + return i1->idx < i2->idx ? -1 : 1; +} + + +static long int +intel_check_word (int name, unsigned int value, bool *has_level_2, + bool *no_level_2_or_3) +{ + if ((value & 0x80000000) != 0) + /* The register value is reserved. */ + return 0; + + /* Fold the name. The _SC_ constants are always in the order SIZE, + ASSOC, LINESIZE. */ + int folded_name = (_SC_LEVEL1_ICACHE_SIZE + + ((name - _SC_LEVEL1_ICACHE_SIZE) / 3) * 3); + + while (value != 0) + { + unsigned int byte = value & 0xff; + + if (byte == 0x40) + *no_level_2_or_3 = true; + else + { + struct intel_02_cache_info *found; + struct intel_02_cache_info search; + + search.idx = byte; + found = bsearch (&search, intel_02_known, nintel_02_known, + sizeof (intel_02_known[0]), intel_02_known_compare); + if (found != NULL) + { + if (found->name == folded_name) + { + unsigned int offset = name - folded_name; + + if (offset == 0) + /* Cache size. */ + return found->size; + if (offset == 1) + return found->assoc; + + assert (offset == 2); + return found->linesize; + } + + if (found->name == _SC_LEVEL2_CACHE_SIZE) + *has_level_2 = true; + } + } + + /* Next byte for the next round. */ + value >>= 8; + } + + /* Nothing found. */ + return 0; +} + + +static long int +handle_intel (int name, unsigned int maxidx) +{ + if (maxidx < 2) + { + // XXX Do such processors exist? When we know we can fill in some + // values. + return 0; + } + + /* OK, we can use the CPUID instruction to get all info about the + caches. */ + unsigned int cnt = 0; + unsigned int max = 1; + long int result = 0; + bool no_level_2_or_3 = false; + bool has_level_2 = false; + while (cnt++ < max) + { + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (2)); + + /* The low byte of EAX in the first round contain the number of + rounds we have to make. At least one, the one we are already + doing. */ + if (cnt == 1) + { + max = eax & 0xff; + eax &= 0xffffff00; + } + + /* Process the individual registers' value. */ + result = intel_check_word (name, eax, &has_level_2, &no_level_2_or_3); + if (result != 0) + return result; + + result = intel_check_word (name, ebx, &has_level_2, &no_level_2_or_3); + if (result != 0) + return result; + + result = intel_check_word (name, ecx, &has_level_2, &no_level_2_or_3); + if (result != 0) + return result; + + result = intel_check_word (name, edx, &has_level_2, &no_level_2_or_3); + if (result != 0) + return result; + } + + if (name >= _SC_LEVEL2_CACHE_SIZE && name <= _SC_LEVEL3_CACHE_LINESIZE + && no_level_2_or_3) + return -1; + + return 0; +} + + +/* Get the value of the system variable NAME. */ +long int +__sysconf (int name) +{ + /* We only handle the cache information here (for now). */ + if (name < _SC_LEVEL1_ICACHE_SIZE || name > _SC_LEVEL4_CACHE_ASSOC) + return linux_sysconf (name); + + /* Recognize i386 and compatible. These don't have any cache on + board. */ + int eflags; + int ac; + asm volatile ("pushfl;\n\t" + "popl %0;\n\t" + "movl $0x240000, %1;\n\t" + "xorl %0, %1;\n\t" + "pushl %1;\n\t" + "popfl;\n\t" + "pushfl;\n\t" + "popl %1;\n\t" + "xorl %0, %1;\n\t" + "pushl %0;\n\t" + "popfl" + : "=r" (eflags), "=r" (ac)); + if (ac == 0) + /* This is an i386. */ + // XXX Is this true for all brands? + return -1; + + /* Detect i486, the last Intel processor without CPUID. */ + if ((ac & (1 << 21)) == 0) + { + /* No CPUID. */ + // XXX Fill in info about other brands. For now only Intel. + return handle_i486 (name); + } + + /* Find out what brand of processor. */ + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (0)); + + if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69) + return handle_intel (name, eax); + // XXX Fill in more vendors. + + /* CPU not known, we have no information. */ + return 0; +} + +/* Now the generic Linux version. */ +#undef __sysconf +#define __sysconf static linux_sysconf +#include "../sysconf.c" diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c index 61e9865dce..6fae5590f5 100644 --- a/sysdeps/unix/sysv/linux/sysconf.c +++ b/sysdeps/unix/sysv/linux/sysconf.c @@ -17,6 +17,7 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <errno.h> #include <fcntl.h> #include <stdlib.h> #include <sysdep.h> @@ -26,10 +27,6 @@ static long int posix_sysconf (int name); -/* Define this first, so it can be inlined. */ -#define __sysconf static posix_sysconf -#include <sysdeps/posix/sysconf.c> - /* Get the value of the system variable NAME. */ long int @@ -83,3 +80,8 @@ __sysconf (int name) } return posix_sysconf (name); } + +/* Now the POSIX version. */ +#undef __sysconf +#define __sysconf static posix_sysconf +#include <sysdeps/posix/sysconf.c> |