diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/x86/dl-cacheinfo.h | 31 |
1 files changed, 13 insertions, 18 deletions
diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h index 5ddb35c9d9..87486054f9 100644 --- a/sysdeps/x86/dl-cacheinfo.h +++ b/sysdeps/x86/dl-cacheinfo.h @@ -187,7 +187,7 @@ intel_check_word (int name, unsigned int value, bool *has_level_2, ++round; } /* There is no other cache information anywhere else. */ - break; + return -1; } else { @@ -257,28 +257,23 @@ handle_intel (int name, const struct cpu_features *cpu_features) /* 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; + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + __cpuid (2, eax, ebx, ecx, edx); - while (cnt++ < max) + /* The low byte of EAX of CPUID leaf 2 should always return 1 and it + should be ignored. If it isn't 1, use CPUID leaf 4 instead. */ + if ((eax & 0xff) != 1) + return intel_check_word (name, 0xff, &has_level_2, &no_level_2_or_3, + cpu_features); + else { - unsigned int eax; - unsigned int ebx; - unsigned int ecx; - unsigned int edx; - __cpuid (2, eax, ebx, ecx, edx); - - /* 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; - } + eax &= 0xffffff00; /* Process the individual registers' value. */ result = intel_check_word (name, eax, &has_level_2, |