Re: Data storing

["Randy.Dunlap" <rddunlap@osdl.org>]

On Wed, 23 Apr 2003 15:28:08 +0300 Andrew Kirilenko <icedank@gmx.net> wrote:

| > > I need to make some checks (search for particular BIOS version) in the
| > > very start of the kernel. I need to store this data (zero page is pretty
| > > good for this, I think) and access it from arch/i386/boot/setup.S,
| > > arch/i386/boot/compressed/misc.c and in some other places. Can somebody
| > > suggest me good place to put check procedure and how to pass data?
| >
| > I use 0x000001f0 (absolute) for relocating virtual disk code
| > for booting embedded systems. After Linux is up, the code remains
| > untouched. This might be a good location because the BIOS doesn't
| > use it during POST/boot and Linux (currently) leaves it alone.
| > Of course, this doesn't mean that somebody will not destroy this
| > area in the future (probably to spite you and me!!!).
| 
| Yes, I know about this area, as I wrote (Documentation/i386/zero-page.txt). 
| And I even know how to pass parameter from zero-page into kernel space 
| (setup.c). But I need to use this parm, I fetched, in both setup.S and misc.c 
| (see below). And I don't have any ideas about execute order of setup.S, 
| misc.c and setup.c.

Hi,
Some of this early boot info can be found in my (somewhat old)
"Linux 2.4.x Initialization for IA-32", located at
  http://www.xenotime.net/linux/linit/lin240_init_x86.html

--
~Randy