int 0x15, ah=0x88 question

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Hi all,

Following code comes from arch/i386/boot/setup.S (memory detection):

387 movb $0x88, %ah
388 int $0x15
389 movw %ax, (2)

Why memory address 2 is used? Where else in the kernel is it used? We are in
real mode, so (2) should be the same as %ds:(2), or not?

Sorry that I'm bugging the mailing list with that question but I didn't
found the answer anywhere. So a web page, a book or something else would be also
nice as an answer.

Regards,

Andy

Ps: please cc me!

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