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| author | Andy Polyakov <appro@openssl.org> | 2004-07-26 20:18:55 +0000 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2004-07-26 20:18:55 +0000 |
| commit | 14e21f863a3e3278bb8660ea9844e92e52e1f2f7 (patch) | |
| tree | 5bcc6cfa9002eb94d2788bc3fa8c72eb5b9f188e /crypto/x86cpuid.pl | |
| parent | f10725a6e19f0d72df5789e38601918539e64082 (diff) | |
| download | openssl-14e21f863a3e3278bb8660ea9844e92e52e1f2f7.zip openssl-14e21f863a3e3278bb8660ea9844e92e52e1f2f7.tar.gz openssl-14e21f863a3e3278bb8660ea9844e92e52e1f2f7.tar.bz2 | |
Add framework for yet another assembler module dubbed "cpuid." Idea
is to have a placeholder to small routines, which can be written only
in assembler. In IA-32 case this includes processor capability
identification and access to Time-Stamp Counter. As discussed earlier
OPENSSL_ia32cap is introduced to control recently added SSE2 code
pathes (see docs/crypto/OPENSSL_ia32cap.pod). For the moment the
code is operational on ELF platforms only. I haven't checked it yet,
but I have all reasons to believe that Windows build should fail to
link too. I'll be looking into it shortly...
Diffstat (limited to 'crypto/x86cpuid.pl')
| -rw-r--r-- | crypto/x86cpuid.pl | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl new file mode 100644 index 0000000..85fbef7 --- /dev/null +++ b/crypto/x86cpuid.pl @@ -0,0 +1,43 @@ +#!/usr/bin/env perl + +push(@INC,"perlasm"); +require "x86asm.pl"; + +&asm_init($ARGV[0],"x86cpuid"); + +&function_begin("OPENSSL_ia32_cpuid"); + &xor ("edx","edx"); + &pushf (); + &pop ("eax"); + &mov ("ecx","eax"); + &xor ("eax",1<<21); + &push ("eax"); + &popf (); + &pushf (); + &pop ("eax"); + &xor ("ecx","eax"); + &bt ("ecx",21); + &jnc (&label("nocpuid")); + &mov ("eax",1); + &cpuid (); +&set_label("nocpuid"); + &mov ("eax","edx"); + &mov ("edx","ecx"); +&function_end("OPENSSL_ia32_cpuid"); + +&external_label("OPENSSL_ia32cap"); + +&function_begin_B("OPENSSL_rdtsc"); + &xor ("eax","eax"); + &xor ("edx","edx"); + &picmeup("ecx","OPENSSL_ia32cap"); + &bt (&DWP(0,"ecx"),4); + &jnc (&label("notsc")); + &rdtsc (); +&set_label("notsc"); + &ret (); +&function_end_B("OPENSSL_rdtsc"); + +&initseg("OPENSSL_cpuid_setup") if ($main'elf); + +&asm_finish(); |