How to identify 32 or 64 bits -

[Bob Goodwin]

On 17/12/09 08:56, Bryn M. Reeves wrote:
> On Thu, 2009-12-17 at 13:48 +0000, Patrick O'Callaghan wrote:
>    
>> bash-4.0$ grep lm /proc/cpuinfo
>> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
>> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
>> bash-4.0$
>>
>> (the lahf_lm flag matches, though I've no idea what it means).
>>      
> arch/x86/include/asm/cpufeature.h says it indicates whether the
> LAHF/SAHF (load status flags to AH /save AH to status flags)
> instructions are available in long mode.
>
> I'm not sure what it implies if you have lahf_lm but not lm!
>
> Regards,
> Bryn.
>
>
>    

    Good!  Thanks to all who responded, this has been educational and
    worth the bandwidth expended to me ... So much to know, so little
    time to learn!

    Bob