Re: mmx instruction support on bohcs

Can I have one of those cars?

You probably want to read about booting and protected mode, and a whole
bunch of other things as bochs emulates a whole computer.
If you are writing code to directly run on bochs then you are
kinda writing an operating system. So go see http://wiki.osdev.org/Main_Page
Now, if you are writing application code, I doubt your errors would be
happening in application code on major OSes, as they are good about
enabling the flags for mmx and sse, etc, as long as the features are
present.

On Fri, Apr 26, 2013 at 3:30 AM, Hatte John <[email protected]> wrote:

> thanks !
>
> I have got what you mean! I should enable some characters I want ,not
> modify its source .
> bochs is abstract  than os  ,  So i got confused ，consider it as fixed
> hardware.not programmable.
>
>  .
>
> . .
>
>
>
>
>
> 2013/4/26 Stanislav <[email protected]>
>
>> I bought a car and filled it with water instead of gasoline so it doesn’t
>> work.****
>>
>> What should change in the car firmware to make it working ?****
>>
>> ** **
>>
>> I strongly suggesting you to read Intel Software Developers manual first.
>> ****
>>
>> ** **
>>
>> Stanislav****
>>
>> ** **
>>
>> *From:* Hatte John [mailto:[email protected]]
>> *Sent:* Friday, April 26, 2013 6:14 AM
>> *To:* Thore Sittly
>> *Cc:* Stanislav; [email protected]
>> *Subject:* Re: Re: [Bochs-developers] mmx instruction support on bohcs***
>> *
>>
>> ** **
>>
>>   Need I   add these to bochs source ? if I want to enable sse .****
>>
>> ** **
>>
>> ** **
>>
>> 2013/4/26 Thore Sittly <[email protected]>****
>>
>> Maybe this should work:****
>>
>> ;now enable SSE and the like****
>>
>> mov eax, cr0****
>>
>> and ax, 0xFFFB         ;clear coprocessor emulation CR0.EM****
>>
>> or ax, 0x2                     ;set coprocessor monitoring  CR0.MP****
>>
>> mov cr0, eax****
>>
>> mov eax, cr4****
>>
>> or ax, 3 << 9          ;set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time****
>>
>> mov cr4, eax****
>>
>> ret****
>>
>>  ****
>>
>>  ****
>>
>> ** **
>>
>
>
>
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