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