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authorsimon <simon@FreeBSD.org>2006-07-29 19:41:41 +0000
committersimon <simon@FreeBSD.org>2006-07-29 19:41:41 +0000
commit018ef6efe1e20b420eaa3afdaa37b0abeba93a1a (patch)
treee9b6155f49a3b6073b95b808e1e0a1ec5489a21f /secure/lib/libcrypto/man/OPENSSL_ia32cap.3
parent152e76d1d1dcc649357b52f30943345b06aa162c (diff)
downloadFreeBSD-src-018ef6efe1e20b420eaa3afdaa37b0abeba93a1a.zip
FreeBSD-src-018ef6efe1e20b420eaa3afdaa37b0abeba93a1a.tar.gz
Upgrade to OpenSSL 0.9.8b.
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+.\" ========================================================================
+.\"
+.IX Title "OPENSSL_ia32cap 3"
+.TH OPENSSL_ia32cap 3 "2006-07-29" "0.9.8b" "OpenSSL"
+.SH "NAME"
+OPENSSL_ia32cap \- finding the IA\-32 processor capabilities
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 2
+\& unsigned long *OPENSSL_ia32cap_loc(void);
+\& #define OPENSSL_ia32cap (*(OPENSSL_ia32cap_loc()))
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+Value returned by \fIOPENSSL_ia32cap_loc()\fR is address of a variable
+containing \s-1IA\-32\s0 processor capabilities bit vector as it appears in \s-1EDX\s0
+register after executing \s-1CPUID\s0 instruction with EAX=1 input value (see
+Intel Application Note #241618). Naturally it's meaningful on IA\-32[E]
+platforms only. The variable is normally set up automatically upon
+toolkit initialization, but can be manipulated afterwards to modify
+crypto library behaviour. For the moment of this writing three bits are
+significant, namely bit #28 denoting Hyperthreading, which is used to
+distinguish Intel P4 core, bit #26 denoting \s-1SSE2\s0 support, and bit #4
+denoting presence of Time-Stamp Counter. Clearing bit #26 at run-time
+for example disables high-performance \s-1SSE2\s0 code present in the crypto
+library. You might have to do this if target OpenSSL application is
+executed on \s-1SSE2\s0 capable \s-1CPU\s0, but under control of \s-1OS\s0 which does not
+support \s-1SSE2\s0 extentions. Even though you can manipulate the value
+programmatically, you most likely will find it more appropriate to set
+up an environment variable with the same name prior starting target
+application, e.g. 'env OPENSSL_ia32cap=0x10 apps/openssl', to achieve
+same effect without modifying the application source code.
+Alternatively you can reconfigure the toolkit with no\-sse2 option and
+recompile.
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