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+.\" ========================================================================
+.\"
+.IX Title "OPENSSL_ia32cap 3"
+.TH OPENSSL_ia32cap 3 "2010-11-16" "0.9.8p" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.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 six bits are
+significant, namely:
+.PP
+1. bit #28 denoting Hyperthreading, which is used to distiguish
+   cores with shared cache;
+2. bit #26 denoting \s-1SSE2\s0 support;
+3. bit #25 denoting \s-1SSE\s0 support;
+4. bit #23 denoting \s-1MMX\s0 support;
+5. bit #20, reserved by Intel, is used to choose between \s-1RC4\s0 code
+   pathes;
+6. bit #4 denoting presence of Time-Stamp Counter.
+.PP
+For example, clearing bit #26 at run-time 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. on Intel P4 processor 'env
+OPENSSL_ia32cap=0x12900010 apps/openssl', to achieve same effect
+without modifying the application source code. Alternatively you can
+reconfigure the toolkit with no\-sse2 option and recompile.