why need 32bit code in seabios?

[wx]

Hi,     I have a Childish question,why need 32bit code in seabios?. I found some files are compiled in 16bit and 32bit twice.    Thanks!

[Darmawan Salihun]

Hi,
I'm not sure about it, but probably for BIOS32 Service Directory.

Regards,

Darmawan

On 7/20/12, wx  wrote:
> Hi,     I have a Childish question,why need 32bit code in seabios?. I found
> some files are compiled in 16bit and 32bit twice.    Thanks!

[Kevin O'Connor]

On Fri, Jul 20, 2012 at 05:08:09AM +0000, wx wrote:
> Hi, I have a Childish question,why need 32bit code in seabios?. I
> found some files are compiled in 16bit and 32bit twice.  Thanks!

Various BIOS protocols require support for four modes: "real mode",
"big real mode", "16bit protected mode", and "32bit segmented mode".
SeaBIOS supports calls in all of these modes and it also runs much of
its own internal code in "32bit flat mode".

So, why run its internal code in 32bit flat mode?  This mode is the
only real sane way to use a 32bit Intel processor, and it's the mode
gcc natively works in.  It offers the least surprises to regular C
developers.

-Kevin