2 Oct
2010
2 Oct
'10
4:32 p.m.
On Sat, Oct 02, 2010 at 11:39:06AM +0200, Avi Kivity wrote:
On 09/30/2010 05:51 AM, Kevin O'Connor wrote:
On Wed, Sep 29, 2010 at 08:19:33AM -0700, H. Peter Anvin wrote:
Yeah... big real mode is rather expensive in terms of the 66 and 67 prefixes you end up littering the code with just to be in the mode you actually want. Better then to load a GDT, flip CR0.PE, and go to a 32-bit code segment anyway.
That brings up an interesting question. Do you know if instruction prefixes result in slower cpu execution?
Is there really a performance problem in seabios?
No. I was asking only out of curiosity. Even if prefixes slow 16bit mode, a normal SeaBIOS boot runs very little 16bit code.
-Kevin