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SubjectRe: amd3d flag listed as flag 31
On Thu, Dec 10, 1998 at 08:02:35PM +0100, Robbert Muller wrote:

> like i said in the subject with 2.1.131-ac6 my cpuinfo contains the
> following in
> ----
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 5
> model : 8
> model name : AMD-K6(tm) 3D processor
> stepping : unknown
> cpu MHz : 299.382222
> fdiv_bug : no
> hlt_bug : no
> sep_bug : no
> f00f_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr mce cx8 sep mmx 31
> bogomips : 598.02
> ------

> and i think that 31 must be amd3d, If search the code but i cant't find
> the error, it seems that the code is correct.

Wat you are looking for is in arch/i386/kernel/setup.c:

static char *x86_cap_flags[] = {
"fpu", "vme", "de", "pse", "tsc", "msr", "6", "mce",
"cx8", "9", "10", "sep", "12", "pge", "14", "cmov",
"16", "17", "18", "19", "20", "21", "22", "mmx",
"24", "25", "26", "27", "28", "29", "30", "31"
};
If you wish for your kernel to show '3dnow!' instead of '31', you can change
the string in that piece of code. I suspect, however, that it isn't done in
the stock kernel because flag 31 isn't 'officially' 3dnow!, and intel might
use it for itself in some way (and screw 3dnow! drivers/applications that
dont check if the cpu is, indeed, an AMD.) -- This is just a guess though, I
dont know enough about ia32 and who specifies what to say anything
meaningful about it.

(Note that changing 31 into 3dnow! _could_ break code that checks if flag 31
is set by reading /proc/cpuinfo. I dont know of any such code and it'd be
silly code anyway (because who knows what the flag will be named in later
kernels) but I'll mention it none the less :)

Regards,
Thomas.

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