Cpuid modules updates.

1 files changed, 78 insertions, 0 deletions

diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index 894c49c0a3..9ad9435ffd 100644
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -72,6 +72,84 @@ require "x86asm.pl";
 	&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");
+	&xor	("edx","edx");
+	&picmeup("ecx","OPENSSL_ia32cap_P");
+	&mov	("ecx",&DWP(0,"ecx"));
+	&bt	(&DWP(0,"ecx"),1);
+	&jnc	(&label("no_x87"));
+	&bt	(&DWP(0,"ecx"),26);
+	&jnc	(&label("no_sse2"));
+	&pxor	("xmm0","xmm0");
+	&pxor	("xmm1","xmm1");
+	&pxor	("xmm2","xmm2");
+	&pxor	("xmm3","xmm3");
+	&pxor	("xmm4","xmm4");
+	&pxor	("xmm5","xmm5");
+	&pxor	("xmm6","xmm6");
+	&pxor	("xmm7","xmm7");
+&set_label("no_sse2");
+	# just a bunch of fldz to zap the fp/mm bank...
+	&data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9);
+	&emms	();
+&set_label("no_x87");
+	&lea	("eax",&DWP(4,"esp"));
+	&ret	();
+&function_end_B("OPENSSL_wipe_cpu");
+
+&function_begin_B("OPENSSL_atomic_add");
+	&mov	("edx",&DWP(4,"esp"));	# fetch the pointer, 1st arg
+	&mov	("ecx",&DWP(8,"esp"));	# fetch the increment, 2nd arg
+	&push	("ebx");
+	&nop	();
+	&mov	("eax",&DWP(0,"edx"));
+&set_label("spin");
+	&lea	("ebx",&DWP(0,"eax","ecx"));
+	&nop	();
+	&data_word(0x1ab10ff0);	# lock;	cmpxchg	%ebx,(%edx)	# %eax is envolved and is always reloaded
+	&jne	(&label("spin"));
+	&mov	("eax","ebx");	# OpenSSL expects the new value
+	&pop	("ebx");
+	&ret	();
+&function_end_B("OPENSSL_atomic_add");
+
 &initseg("OPENSSL_cpuid_setup");
 
 &asm_finish();