Re: kernel

[Arun Sharma <adsharma@xxxxxxxxxxxxxxx>]

On Mon, Apr 24, 2000 at 10:46:29AM +0530, Rakesh Agarwal wrote:
> I am confused because  the document at
> http://www.lunetix.de/docs/KHG/node57.html mentions that the kernel
> code+data is at 0x006000 and 1M actually has page tables

I don't know when this document was written. But I think this is
conclusive:

include/asm-i386/page.h:

#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))

PAGE_OFFSET is defined to be 0xc0000000 in normal linux kernels.
If you look at objdump -h vmlinux, you can figure out that the
text starts at PAGE_OFFSET + 1M virtual = 1M physical.

Also, see how page tables are initialized in 

arch/i386/mm/init.c:paging_init

	-Arun