Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: hex addresses in setup.S | Date | 16 Jan 2002 12:03:16 -0800 |
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Followup to: <BJEJJDPJOCEPDBLPFDKJCEACCCAA.ceswiedler@mindspring.com> By author: "Chris Swiedler" <ceswiedler@mindspring.com> In newsgroup: linux.dev.kernel > > Why does setup.S define the default system load address as 0x1000, and the > comment on the line explain this to be 0x10000(and gives the decimal > translation of 65536, so it's not a typo)? This seems to be true for several > addresss (0x9000 = 0x90000, etc). I'm sure there's something simple I'm > missing...what is it? >
In real mode:
linear_address := (segment << 4) + offset
Those addresses are "segment" addresses, with (implied) offset == 0. These kinds of addresses are sometimes referred to as "paragraph addresses" (paragraph being bigger than words but smaller than pages, I guess.)
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