P4 powerup register value

[zhu shi song]

When p4 power up , what's the value and meaning of the
registers such as ebx, edx etc?  
Who know the information, need help.
 tks
 zhu

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[Peter Stuge]

On Thu, Sep 30, 2004 at 03:59:10AM -0700, zhu shi song wrote:
> When p4 power up , what's the value and meaning of the
> registers such as ebx, edx etc?  
> Who know the information, need help.

Hmm? eax, ebx, ecx and edx are the 32 bit standard registers that
have been around since the 386. I believe they don't have any meaning
at power on. Their values, if defined, would be listed in a
programming manual for the P4. (Or the 386.)

//Peter

[Stefan Reinauer]

* Peter Stuge  [040930 15:07]:
> Hmm? eax, ebx, ecx and edx are the 32 bit standard registers that
> have been around since the 386. I believe they don't have any meaning
> at power on. Their values, if defined, would be listed in a
> programming manual for the P4. (Or the 386.)

Some actually do have a meaning. Have a look at the freebios2 tree:

freebios2/cpu/i386/bist32.inc

Stefan