Messages in this thread Patch in this message | | | Subject | [PATCH2] Pentium Pro - sysenter - doublefault | From | Jim Houston <> | Date | 21 Aug 2003 22:18:05 -0400 |
| |
On Thu, 2003-08-21 at 17:32, Mikael Pettersson wrote: > > The logic above is exactly what Intel says to do in "IA-32 Intel® > > Architecture Software Developer's Manual, Volume 2: Instruction Set > > Reference" on page 3-767. It also says that sysenter was added to the > > Pentium II. > > I double-checked AP-485 (24161823.pdf, the "real" reference to CPUID), > and it says (section 3.4) that SEP is unsupported when the signature > as a whole is less that 0x633. This means all PPros, and PII Model 3s > with steppings less than 3. >
Hi Dave, Everyone,
This make sense. Here is Mikael's suggested code as a patch.
Dave, I picked your name from the maintainers list. Please feed this patch up the chain.
Jim Houston - Concurrent Computer Corp.
diff -urN linux-2.6.0-test3.orig/arch/i386/kernel/cpu/intel.c linux-2.6.0-test3.new/arch/i386/kernel/cpu/intel.c --- linux-2.6.0-test3.orig/arch/i386/kernel/cpu/intel.c 2003-08-20 10:30:14.000000000 -0400 +++ linux-2.6.0-test3.new/arch/i386/kernel/cpu/intel.c 2003-08-21 21:34:40.000000000 -0400 @@ -246,7 +246,8 @@ } /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it */ - if ( c->x86 == 6 && c->x86_model < 3 && c->x86_mask < 3 ) + if ( c->x86 == 6 && ((c->x86_model < 3) || + (c->x86_model == 3 && c->x86_mask < 3))) clear_bit(X86_FEATURE_SEP, c->x86_capability); /* Names for the Pentium II/Celeron processors
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |