Hi Michael,
On Tue, Apr 1, 2014 at 10:12 AM, schmitz
<schmitz@xxxxxxxxxxxxxxxxxxxxxxxxxx> 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 -- geert@xxxxxxxxxxxxxx
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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