Followup to: <Pine.LNX.3.95.1000525220139.6760Afirstname.lastname@example.org>
By author: "Richard B. Johnson" <email@example.com>
In newsgroup: linux.dev.kernel
> Does anybody really know what BIOS function 0xe801, interrupt
> 0x15 is supposed to return? I mean, by specification, not conjecture.
> None of my BIOS books show a spec for this function number.
> Relevant Linux boot code follows. It implies that register ax is
> supposed to contain so-called "base-memory", i.e., 640k (in kilobytes)
> and register bx is supposed to contain so-called "extended-memory", i.e.,
> memory above 1 megabyte (in 64 kilobyte chunks).
The interrupt list is your friend.
> This works on most systems, I am sure. However, I have two motherboards
> which contain a BIOS that confuses Linux, requiring a "MEM=" entry
> to boot. Otherwise I get a seg-fault in the kernel while memory is being
> This is from the so-called "stable" kernels, ../boot/setup.S. This has
> been changed on later kernels to use GAS, but the logic is the same.
Can you do this under plain DOS (no CONFIG.SYS, no AUTOEXEC.BAT):
... and let us know what the output is?
As for how the interrupt works, Ralf Brown's Interrupt List is the bible...
-- <firstname.lastname@example.org> at work, <email@example.com> in private! "Unix gives you enough rope to shoot yourself in the foot."
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