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authorUlrich Drepper <drepper@redhat.com>2007-05-21 22:38:06 +0000
committerUlrich Drepper <drepper@redhat.com>2007-05-21 22:38:06 +0000
commit6d59823c29df228415836f289e62064f95849e71 (patch)
treef6475011e9a3e31355379e0b1576b9998abf5e96 /sysdeps/x86_64/cacheinfo.c
parent7adefea85d3fcd88e60638d18a022b6968b9b891 (diff)
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* sysdeps/x86_64/cacheinfo.c (init_cacheinfo): Pass correct value
as second parameter to handle_intel.
Diffstat (limited to 'sysdeps/x86_64/cacheinfo.c')
-rw-r--r--sysdeps/x86_64/cacheinfo.c37
1 files changed, 19 insertions, 18 deletions
diff --git a/sysdeps/x86_64/cacheinfo.c b/sysdeps/x86_64/cacheinfo.c
index 65277389dd..f8217a1757 100644
--- a/sysdeps/x86_64/cacheinfo.c
+++ b/sysdeps/x86_64/cacheinfo.c
@@ -1,6 +1,4 @@
-/*
- x86_64 cache info.
-
+/* x86_64 cache info.
Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -202,7 +200,7 @@ handle_intel (int name, unsigned int maxidx)
long int result = 0;
bool no_level_2_or_3 = false;
bool has_level_2 = false;
-
+
while (cnt++ < max)
{
unsigned int eax;
@@ -349,7 +347,8 @@ __cache_sysconf (int name)
/* Half the core cache size for use in memory and string routines, typically
L1 size. */
long int __x86_64_core_cache_size_half attribute_hidden = 32 * 1024 / 2;
-/* Shared cache size for use in memory and string routines, typically L2 or L3 size. */
+/* Shared cache size for use in memory and string routines, typically
+ L2 or L3 size. */
long int __x86_64_shared_cache_size_half attribute_hidden = 1024 * 1024 / 2;
/* PREFETCHW support flag for use in memory and string routines. */
int __x86_64_prefetchw attribute_hidden;
@@ -378,24 +377,25 @@ init_cacheinfo (void)
/* This spells out "GenuineIntel". */
if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
{
- core = handle_intel (_SC_LEVEL1_DCACHE_SIZE, eax);
-
+ core = handle_intel (_SC_LEVEL1_DCACHE_SIZE, max_cpuid);
+
/* Try L3 first. */
level = 3;
- shared = handle_intel (_SC_LEVEL3_CACHE_SIZE, eax);
-
+ shared = handle_intel (_SC_LEVEL3_CACHE_SIZE, max_cpuid);
+
if (shared <= 0)
{
/* Try L2 otherwise. */
level = 2;
- shared = handle_intel (_SC_LEVEL2_CACHE_SIZE, eax);
+ shared = handle_intel (_SC_LEVEL2_CACHE_SIZE, max_cpuid);
}
-
- /* Figure out the number of logical threads that share the highest cache level. */
+
+ /* Figure out the number of logical threads that share the
+ highest cache level. */
if (max_cpuid >= 4)
{
int i = 0;
-
+
/* Query until desired cache level is enumerated. */
do
{
@@ -404,7 +404,7 @@ init_cacheinfo (void)
: "0" (4), "2" (i++));
}
while (((eax >> 5) & 0x7) != level);
-
+
threads = ((eax >> 14) & 0x3ff) + 1;
}
else
@@ -413,11 +413,12 @@ init_cacheinfo (void)
asm volatile ("cpuid"
: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
: "0" (1));
-
+
threads = (ebx >> 16) & 0xff;
}
-
- /* Cap usage of highest cache level to the number of supported threads. */
+
+ /* Cap usage of highest cache level to the number of supported
+ threads. */
if (shared > 0 && threads > 0)
shared /= threads;
}
@@ -426,7 +427,7 @@ init_cacheinfo (void)
{
core = handle_amd (_SC_LEVEL1_DCACHE_SIZE);
shared = handle_amd (_SC_LEVEL2_CACHE_SIZE);
-
+
asm volatile ("cpuid"
: "=a" (max_cpuid_ex), "=b" (ebx), "=c" (ecx), "=d" (edx)
: "0" (0x80000000));