- update OpenSSL to 0.9.8
[dragonfly.git] / secure / lib / libcrypto / man / OPENSSL_ia32cap.3
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129.\" ========================================================================
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131.IX Title "OPENSSL_ia32cap 3"
132.TH OPENSSL_ia32cap 3 "2005-07-06" "0.9.8" "OpenSSL"
133.SH "NAME"
134OPENSSL_ia32cap \- finding the IA\-32 processor capabilities
135.SH "SYNOPSIS"
136.IX Header "SYNOPSIS"
137.Vb 2
138\& unsigned long *OPENSSL_ia32cap_loc(void);
139\& #define OPENSSL_ia32cap (*(OPENSSL_ia32cap_loc()))
140.Ve
141.SH "DESCRIPTION"
142.IX Header "DESCRIPTION"
143Value returned by \fIOPENSSL_ia32cap_loc()\fR is address of a variable
144containing \s-1IA\-32\s0 processor capabilities bit vector as it appears in \s-1EDX\s0
145register after executing \s-1CPUID\s0 instruction with EAX=1 input value (see
146Intel Application Note #241618). Naturally it's meaningful on IA\-32[E]
147platforms only. The variable is normally set up automatically upon
148toolkit initialization, but can be manipulated afterwards to modify
149crypto library behaviour. For the moment of this writing three bits are
150significant, namely bit #28 denoting Hyperthreading, which is used to
151distinguish Intel P4 core, bit #26 denoting \s-1SSE2\s0 support, and bit #4
152denoting presence of Time-Stamp Counter. Clearing bit #26 at run-time
153for example disables high-performance \s-1SSE2\s0 code present in the crypto
154library. You might have to do this if target OpenSSL application is
155executed on \s-1SSE2\s0 capable \s-1CPU\s0, but under control of \s-1OS\s0 which does not
156support \s-1SSE2\s0 extentions. Even though you can manipulate the value
157programmatically, you most likely will find it more appropriate to set
158up an environment variable with the same name prior starting target
159application, e.g. 'env OPENSSL_ia32cap=0x10 apps/openssl', to achieve
160same effect without modifying the application source code.
161Alternatively you can reconfigure the toolkit with no\-sse2 option and
162recompile.