Merge from vendor branch OPENSSL:
[dragonfly.git] / secure / lib / libcrypto / man / OPENSSL_ia32cap.3
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124.\" ========================================================================
125.\"
126.IX Title "OPENSSL_ia32cap 3"
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127.TH OPENSSL_ia32cap 3 "2007-10-24" "0.9.8g" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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132.SH "NAME"
133OPENSSL_ia32cap \- finding the IA\-32 processor capabilities
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 2
137\& unsigned long *OPENSSL_ia32cap_loc(void);
138\& #define OPENSSL_ia32cap (*(OPENSSL_ia32cap_loc()))
139.Ve
140.SH "DESCRIPTION"
141.IX Header "DESCRIPTION"
142Value returned by \fIOPENSSL_ia32cap_loc()\fR is address of a variable
143containing \s-1IA\-32\s0 processor capabilities bit vector as it appears in \s-1EDX\s0
144register after executing \s-1CPUID\s0 instruction with EAX=1 input value (see
145Intel Application Note #241618). Naturally it's meaningful on IA\-32[E]
146platforms only. The variable is normally set up automatically upon
147toolkit initialization, but can be manipulated afterwards to modify
148crypto library behaviour. For the moment of this writing three bits are
149significant, namely bit #28 denoting Hyperthreading, which is used to
150distinguish Intel P4 core, bit #26 denoting \s-1SSE2\s0 support, and bit #4
151denoting presence of Time-Stamp Counter. Clearing bit #26 at run-time
152for example disables high-performance \s-1SSE2\s0 code present in the crypto
153library. You might have to do this if target OpenSSL application is
154executed on \s-1SSE2\s0 capable \s-1CPU\s0, but under control of \s-1OS\s0 which does not
155support \s-1SSE2\s0 extentions. Even though you can manipulate the value
156programmatically, you most likely will find it more appropriate to set
157up an environment variable with the same name prior starting target
158application, e.g. 'env OPENSSL_ia32cap=0x10 apps/openssl', to achieve
159same effect without modifying the application source code.
160Alternatively you can reconfigure the toolkit with no\-sse2 option and
161recompile.