Messages in this thread | | | Date | Fri, 23 Jun 2006 00:00:57 +0200 | From | Olivier Galibert <> | Subject | Re: Is the x86-64 kernel size limit real? |
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On Thu, Jun 22, 2006 at 02:38:02PM -0700, H. Peter Anvin wrote: > It turns out x86-64, unlike i386, does still have a hardcoded limit, > but the limit in build.c is wrong: > > kernel/head.S: > /* 40MB kernel mapping. The kernel code cannot be bigger than that. > When you change this change KERNEL_TEXT_SIZE in page.h too. */ > /* (2^48-(2*1024*1024*1024)-((2^39)*511)-((2^30)*510)) = 0 */ > > So this should be replaced by KERNEL_TEXT_SIZE in page.h, or better, > this should be done dynamically in x86-64 too.
Interesting. KERNEL_TEXT_SIZE wouldn't work though, since that's the decompressed size while the 4Mb limit is on the compressed size. As a datapoint, though, the uncompressed image is 15.7Mb, for a 4.5Mb compressed image.
OG.
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