Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: For comment: draft BIOS use document for the kernel | Date | 22 Jun 2001 12:05:08 -0700 |
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Followup to: <Pine.LNX.3.95.1010622135228.3929C-100000@chaos.analogic.com> By author: "Richard B. Johnson" <root@chaos.analogic.com> In newsgroup: linux.dev.kernel > > On Fri, 22 Jun 2001, Alan Cox wrote: > > > > I could not find any reference to BIOS int 0x15, function 0x87, block- > > > move, used to copy the kernel to above the 1 megabyte real-mode > > > boundary. I think this is still used. > > > > I dont think the kernel has ever used it. The path has always been to enter > > 32bit mode then relocate/uncompress the kernel, then run it > > > > Then how does 1.44 megabytes of data from a floppy disk (that won't > fit below 1 megabyte), that is accessed in real-mode, ever get to > above 1 megabyte where it can be decompressed? > > I think LILO copies each buffer read from a below 1 Megabyte buffer > (which is the only place the floppy can put its data via the BIOS), > to above 1 megabyte using the BIOS block-move function. >
This is done by LILO, which isn't part of the kernel. SYSLINUX, for example, enters protected mode directly (like the kernel itself does).
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