From 2a1156010784332cbe4bf033ccedb19f52e56a75 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sun, 20 Mar 2011 08:14:30 -0400 Subject: Implement x86 cpuid handling of leaf4 for cache information. --- sysdeps/x86_64/cacheinfo.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'sysdeps/x86_64') diff --git a/sysdeps/x86_64/cacheinfo.c b/sysdeps/x86_64/cacheinfo.c index 337444df07..fdd6427e12 100644 --- a/sysdeps/x86_64/cacheinfo.c +++ b/sysdeps/x86_64/cacheinfo.c @@ -181,6 +181,55 @@ intel_check_word (int name, unsigned int value, bool *has_level_2, /* No need to look further. */ break; } + else if (byte == 0xff) + { + /* CPUID leaf 0x4 contains all the information. We need to + iterate over it. */ + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + + unsigned int round = 0; + while (1) + { + asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" + : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) + : "0" (4), "2" (round)); + + enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f; + if (type == null) + /* That was the end. */ + break; + + unsigned int level = (eax >> 5) & 0x7; + + if ((level == 1 && type == data + && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE)) + || (level == 1 && type == inst + && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE)) + || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE)) + || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)) + || (level == 4 && folded_rel_name == M(_SC_LEVEL4_CACHE_SIZE))) + { + unsigned int offset = M(name) - folded_rel_name; + + if (offset == 0) + /* Cache size. */ + return (((ebx >> 22) + 1) + * (((ebx >> 12) & 0x3ff) + 1) + * ((ebx & 0xfff) + 1) + * (ecx + 1)); + if (offset == 1) + return (ebx >> 22) + 1; + + assert (offset == 2); + return (ebx & 0xfff) + 1; + } + } + /* There is no other cache information anywhere else. */ + break; + } else { if (byte == 0x49 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)) -- cgit 1.4.1