Author: kib
Date: Tue Dec 29 22:14:21 2015
New Revision: 292890
URL: https://svnweb.freebsd.org/changeset/base/292890
Log:
Add standard extended feature bit 6 from the Intel SDM rev. 57, which
indicates that data-pointer in the saved x87 FPU state is only updated
on FPU exceptions.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/x86/include/specialreg.h
head/sys/x86/x86/identcpu.c
Modified: head/sys/x86/include/specialreg.h
==============================================================================
--- head/sys/x86/include/specialreg.h Tue Dec 29 21:54:43 2015
(r292889)
+++ head/sys/x86/include/specialreg.h Tue Dec 29 22:14:21 2015
(r292890)
@@ -335,6 +335,7 @@
#define CPUID_STDEXT_BMI1 0x00000008
#define CPUID_STDEXT_HLE 0x00000010
#define CPUID_STDEXT_AVX2 0x00000020
+#define CPUID_STDEXT_FDP_EXC 0x00000040
#define CPUID_STDEXT_SMEP 0x00000080
#define CPUID_STDEXT_BMI2 0x00000100
#define CPUID_STDEXT_ERMS 0x00000200
Modified: head/sys/x86/x86/identcpu.c
==============================================================================
--- head/sys/x86/x86/identcpu.c Tue Dec 29 21:54:43 2015 (r292889)
+++ head/sys/x86/x86/identcpu.c Tue Dec 29 22:14:21 2015 (r292890)
@@ -932,6 +932,8 @@ printcpuinfo(void)
"\005HLE"
/* Advanced Vector Instructions 2 */
"\006AVX2"
+ /* FDP_EXCPTN_ONLY */
+ "\007FDPEXC"
/* Supervisor Mode Execution Prot. */
"\010SMEP"
/* Bit Manipulation Instructions */
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