Update x86cpuid.pl to correctly detect shared cache and to support new

[openssl.git] / crypto / x86cpuid.pl

diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index c53c9bc9980f6c696eb304713d2b79b5a01822e0..7d924a60b77d78c9352c50bbe89795332a78ee56 100644 (file)
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -20,12 +20,36 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
        &xor    ("ecx","eax");
        &bt     ("ecx",21);
        &jnc    (&label("nocpuid"));
+       &xor    ("eax","eax");
+       &cpuid  ();
+       &xor    ("eax","eax");
+       &cmp    ("ebx",0x756e6547);     # "Genu"
+       &setne  (&LB("eax"));
+       &mov    ("ebp","eax");
+       &cmp    ("edx",0x49656e69);     # "ineI"
+       &setne  (&LB("eax"));
+       &or     ("ebp","eax");
+       &cmp    ("ecx",0x6c65746e);     # "ntel"
+       &setne  (&LB("eax"));
+       &or     ("ebp","eax");
        &mov    ("eax",1);
        &cpuid  ();
+       &bt     ("edx",28);             # test hyper-threading bit
+       &jnc    (&label("nocpuid"));
+       &cmp    ("ebp",0);
+       &jne    (&label("notintel"));
+       &or     ("edx",1<<20);          # use reserved bit to engage RC4_CHAR
+&set_label("notintel");
+       &shr    ("ebx",16);
+       &cmp    (&LB("ebx"),1);         # see if cache is shared(*)
+       &ja     (&label("nocpuid"));
+       &and    ("edx",~(1<<28));       # clear hyper-threading bit if not
 &set_label("nocpuid");
        &mov    ("eax","edx");
        &mov    ("edx","ecx");
 &function_end("OPENSSL_ia32_cpuid");
+# (*)  on Core2 this value is set to 2 denoting the fact that L2
+#      cache is shared between cores.
 
 &external_label("OPENSSL_ia32cap_P");