Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: [GIT PULL] x86 setup: correct booting on 486 (revised) | Date | Tue, 06 Nov 2007 10:09:23 -0700 |
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"H. Peter Anvin" <hpa@zytor.com> writes:
> Jeremy Fitzhardinge wrote: >> H. Peter Anvin wrote: >>> .notes : { >>> *(.note.*) >>> . = ALIGN(4); >>> LONG(0); >>> LONG(0); >>> LONG(0); >>> } >>> >>> Am I missing something? >> >> Oh, I suppose, but I never much liked putting data-definition into the >> linker script. >> > > I think it should be sparsely used, but stuff like simple end markers is pretty > much what it's good for. > > The main reason I want to avoid adding another header field is that the header > is a finite resource; one of the many poor decisions in its original design was > using a 2-byte jump at the top, so address 0x281 is the end of the universe.
That was fixed long ago (by having a 4 byte reserved field in the middle) that we can do a two byte jump and then do a farther jump from there to the 16bit code. So as long as we actually use discipline and really reserve the field for a further jump there should be no need for 0x281 being the end of the universe.
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