Hi Michael,
On Tue, Apr 1, 2014 at 10:12 AM, schmitz
<[email protected]> wrote:
> While poking around in head.S, I came across a comment that stated the
> second page at the start of the kernel is used for the kernel page dir -
> that is the second page of virtual address space (FastRAM, in the case we
> care about here), not physcial address space, right?
The kernel is loaded in the second page of RAM. Initially, this page just
contains a few branches and the bootinfo versions. The code jumps to
_start, and the second page is reused for the kernel page dir:
ENTRY(_stext)
bras 1f /* Jump over bootinfo version numbers */
.long BOOTINFOV_MAGIC
.long MACH_AMIGA, AMIGA_BOOTI_VERSION
....
1: jra __start
.equ kernel_pg_dir,_stext
.equ .,_stext+PAGESIZE
ENTRY(_start)
jra __start
__INIT
ENTRY(__start)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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