Date: Wed, 17 May 2000 11:30:13 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Mark Ovens <mark@ukug.uk.freebsd.org> Cc: chat@freebsd.org, Alfred Perlstein <bright@wintelcom.net>, Kris Kirby <kris@hiwaay.net>, Conrad Sabatier <conrads@home.com> Subject: Re: Yowza! Message-ID: <20000517152930.IMAD22611.mail.rdc1.va.home.com@john.baldwin.cx> In-Reply-To: <20000516182723.A233@parish>
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On 16-May-00 Mark Ovens wrote:
> On Mon, May 15, 2000 at 07:39:11PM -0500, Conrad Sabatier wrote:
>> FreeBSD 4.0-STABLE #0: Sat May 13 19:05:13 CDT 2000
>> conrads@cx344940-a.meta1.la.home.com:/usr/src/sys/compile/MYKERNEL
>> Timecounter "i8254" frequency 1193182 Hz
>> CPU: AMD Athlon(tm) Processor (998.07-MHz 686-class CPU)
>> Origin = "AuthenticAMD" Id = 0x622 Stepping = 2
>> Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,
>> MCA,CMOV,PAT,PSE36,MMX,FXSR>
>
> Just as a slight aside; is there a list anywhere of what all those
> Feature codes mean?
Probably buried somewhere in Intel's manuals.
FPU - Chip has a Floating-point Co-processor
VME - Virtual Mode Extensions - provides a virtual Interrupt Flag for
vm86 mode tasks
DE - Debug Exception (I think), has to do with the debug registers
PSE - Page Size Extension - allows a 4mb page to be used directly from
the page directory instead of having a table of 4k pages
TSC - Supports the time stamp counter, specifically the RDTSC instruction
to read it
MSR - This processors has MSR's, and supports accessing them via RDMSR and
WRMSR
PAE - Page Address Extensions - this allows the processor to address 64
Gig of memory instead of just 4 Gig by squeezing some extra bits out
of the page directory entries. When used with PSE, the large pages
are 2mb in length instead of 4mb.
MCE - Supports the Machine Check Exception.
CX8 - Supports the CMPXCHG8B instruction.
SEP - hmm, not sure
MTRR - Supports Memory Type Range Registes, which allow you to specify
the cache policy used on memory ranges.
PGE - Page Global Enable. Allows you to specify that pages or page-tables
are global pages and are present (and the same) in all of the page
directories. Thus when CR3 is changed to point to a new page
directory, page tables or pages that are marked global do not have
their entries flushed from the TLB.
MCA - Machine Check Architecture, not quite sure what it is.
CMOV - Conditional MOV instructions. Supports a set of MOV instructions
that only perform the MOV if a condition is met. For example,
CMOVZ %al, %bl is equivalent to "jnz @@; mov %al, %bl ; @@:"
PAT - Not sure.
PSE36 - Supports another variation of PSE that supports 36-bit addresssing.
However, this provides this support by using only 4mb pages above the
4 gig mark. This is thus quite wasteful, and quite an ugly hack.
MMX - Supports MMX.
FXSR - No idea.
>> AMD Features=0xc0400000<AMIE,DSP,3DNow!>
AMIE - No idea.
DSP - No idea.
3DNow! - Supports the AMD 3DNow! extensions.
SYSCALL - (seen on K6-[23]'s), supports AMD's SYSCALL instruction.
HTH
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.cslab.vt.edu/~jobaldwi/pgpkey.asc
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