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| author | Rich Salz <rsalz@akamai.com> | 2014-08-09 08:02:20 -0400 |
|---|---|---|
| committer | Rich Salz <rsalz@akamai.com> | 2014-08-09 08:02:20 -0400 |
| commit | f642ebc1e2dca34bc2b3c46796c131e1f5077bee (patch) | |
| tree | a8f54bb26068ebd4bf5a1ef4684ab98758cebc4f /crypto/x86cpuid.pl | |
| parent | 693b71fa719598a487165918cbbc0f7f62816c83 (diff) | |
| download | openssl-new-f642ebc1e2dca34bc2b3c46796c131e1f5077bee.tar.gz | |
Undo a90081576c94f9f54de1755188a00ccc1760549a
Undo unapproved commit that removed DJGPP and WATT32
Diffstat (limited to 'crypto/x86cpuid.pl')
| -rw-r--r-- | crypto/x86cpuid.pl | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl index dca37e7cd2..86772329bc 100644 --- a/crypto/x86cpuid.pl +++ b/crypto/x86cpuid.pl @@ -168,7 +168,7 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); } &ret (); &function_end_B("OPENSSL_rdtsc"); -# This works in Ring 0 only [read MS-DOS+privileged DPMI host], +# This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host], # but it's safe to call it on any [supported] 32-bit platform... # Just check for [non-]zero return value... &function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD"); @@ -202,6 +202,41 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); } &ret (); &function_end_B("OPENSSL_instrument_halt"); +# Essentially there is only one use for this function. Under DJGPP: +# +# #include <go32.h> +# ... +# i=OPENSSL_far_spin(_dos_ds,0x46c); +# ... +# to obtain the number of spins till closest timer interrupt. + +&function_begin_B("OPENSSL_far_spin"); + &pushf (); + &pop ("eax"); + &bt ("eax",9); + &jnc (&label("nospin")); # interrupts are disabled + + &mov ("eax",&DWP(4,"esp")); + &mov ("ecx",&DWP(8,"esp")); + &data_word (0x90d88e1e); # push %ds, mov %eax,%ds + &xor ("eax","eax"); + &mov ("edx",&DWP(0,"ecx")); + &jmp (&label("spin")); + + &align (16); +&set_label("spin"); + &inc ("eax"); + &cmp ("edx",&DWP(0,"ecx")); + &je (&label("spin")); + + &data_word (0x1f909090); # pop %ds + &ret (); + +&set_label("nospin"); + &xor ("eax","eax"); + &xor ("edx","edx"); + &ret (); +&function_end_B("OPENSSL_far_spin"); &function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD"); &xor ("eax","eax"); |