Unified - adapt the generation of cpuid, uplink and buildinf to use GENERATE

[openssl.git] / crypto / x86cpuid.pl

diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index dca37e7cd265878d04a77d6dea0235add06e4c74..48c4cf204b73b9d849c97b482d5f3edaa6232c40 100644 (file)
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -4,6 +4,10 @@ $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
 push(@INC, "${dir}perlasm", "perlasm");
 require "x86asm.pl";
 
+$output = pop;
+open OUT,">$output";
+*STDOUT=*OUT;
+
 &asm_init($ARGV[0],"x86cpuid");
 
 for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
@@ -168,7 +172,7 @@ 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 +206,41 @@ 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");
@@ -452,3 +491,5 @@ my $max = "ebp";
 &hidden("OPENSSL_ia32cap_P");
 
 &asm_finish();
+
+close STDOUT;