Date: Sun, 6 Jun 2004 19:16:23 +1000 From: Tim Robbins <tim@robbins.dropbear.id.au> To: David Malone <dwmalone@maths.tcd.ie> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/amd64/amd64 fpu.c Message-ID: <20040606091623.GA33323@cat.robbins.dropbear.id.au> In-Reply-To: <20040606081221.GA11314@walton.maths.tcd.ie> References: <200406050313.i553Dd3q070600@repoman.freebsd.org> <20040606081221.GA11314@walton.maths.tcd.ie>
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On Sun, Jun 06, 2004 at 09:12:21AM +0100, David Malone wrote: > On Fri, Jun 04, 2004 at 08:13:39PM -0700, David Schultz wrote: > > Modified files: > > sys/amd64/amd64 fpu.c > > Log: > > Initialize the MXCSR to the appropriate default value at startup. > > This seems to result in a "Fault trap 1: privileged instrustion > fault while in the kernel" while executing the ldmscsr instruction. > If I comment it out, everything works fine again. > > > Tested on: tjr > > This must be a situation where testing on humans is bad ;-) It works fine here. CPU: AMD Athlon(tm) 64 Processor 3000+ (2002.57-MHz K8-class CPU) Origin = "AuthenticAMD" Id = 0xf48 Stepping = 8 Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2> AMD Features=0xe0500800<SYSCALL,NX,MMX+,LM,3DNow!+,3DNow!> Tim
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