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List:       freebsd-stable
Subject:    Athlon SSE hack not working on recent XPs [PATCH]
From:       Jon Kuster <kwsn () earthlink ! net>
Date:       2003-03-20 6:17:17
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Hello,

I recently got an AthlonXP 2100+ - one of the Thoroughbred-b versions. 
I have both CPU_ATHLON_SSE_HACK and CPU_ENABLE_SSE in my kernel, but SSE
wasn't being enabled.  After a little investigation, it turns out that
the cpu_id that the hack checks has been bumped and so the check fails. 
The included patch fixes the problem on my system.

Thanks,
Jon Kuster

I'm not subscribed, so please cc: me.

HW info: XP2100+ on an ECS K7S5A with most recent BIOS revision.

FreeBSD jonnyv.kwsn.net 4.8-RC FreeBSD 4.8-RC #3: Wed Mar 19 00:20:19
MST 2003     root@jonnyv.kwsn.net:/usr/obj/usr/src/sys/JONNYV  i386

and the patch itself:

--- initcpu.c-orig	Wed Mar 19 03:17:46 2003
+++ initcpu.c	Wed Mar 19 00:18:34 2003
@@ -26,7 +26,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $FreeBSD: /repoman/r/ncvs/src/sys/i386/i386/initcpu.c,v 1.19.2.8
2003/01/22 20:14:52 jhb Exp $
+ * $FreeBSD: src/sys/i386/i386/initcpu.c,v 1.19.2.8 2003/01/22 20:14:52
jhb Exp $
  */
 
 #include "opt_cpu.h"
@@ -578,7 +578,8 @@
 			 */
 			if ((cpu_feature & CPUID_XMM) == 0 &&
 			    ((cpu_id & ~0xf) == 0x660 ||
-			     (cpu_id & ~0xf) == 0x670)) {
+			     (cpu_id & ~0xf) == 0x670 ||
+			     (cpu_id & ~0xf) == 0x680)) {
 				u_int regs[4];
 				wrmsr(0xC0010015, rdmsr(0xC0010015) & ~0x08000);
 				do_cpuid(1, regs);




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