Re: [PATCH 12/12] i386 boot: Add an ELF header to bzImage

[H. Peter Anvin]

Vivek Goyal wrote:
> >
> Hi Eric,
>
> I have added cld in the regenerated patch below. 

No, the cld needs to be earlier.  It turns out this isn't the first use 
of string instructions.

I think I am going to add DF=0 as a documented entry condition; it 
definitely seems all current Linux kernels require it.

> Also one more minor nit. stosb relies on being %es set properly. By the
> time control reaches loader_ok, i could not find %es being set explicitly
> hence I am assuming we are relying on bootloader to set it up for us. 
>
> Maybe we can be little more paranoid and setup the %es before stosb. I
> have done this change too in the attached patch. Pleaese have a look.
> I know little about assembly code.

%es being set is part of the requirements list, although it *would* be 
better to not rely on any segment registers being set at all (only rely 
on %cs.)

	-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/