[LinuxBIOS] First instruction in linuxbios

[Jorge Cardona]

Hi.
I'm new in this, and i'm reading the source and i have a question, which one 
it's exactly the first instruction that the processor execute when the pc is 
booting?, in which file is it?

I don't complete understand the relationship between a normal bios and the 
kernel, i think that the bios it's has to pass some data to the kernel, if 
that's true ¿how exactly is that data passed to the kernel?

In linuxbios, how it's this issue handle?

PD: sorry for my english
Thanks

[yhlu]

reset16.inc--->entry16.inc--->entry32.inc--->cache_as_ram.inc--->cache_as_ram_auto.c(include
mem init and ht init, and copy or unzip linuxbios_ram to ram and jmp
it)---->hardwaremain.c( dev init and resource allocation) --->elfload(
to load payload)

from hardwaremain to elfload is linked and compressed in linuxbios_ram.rom
and togther with others is linked into linuxbios.rom

YH

On 7/1/05, Jorge Cardona  wrote:
> Hi.
> I'm new in this, and i'm reading the source and  i have a question, which
> one it's exactly the first instruction that the processor execute when the
> pc is booting?, in which file is it?
>
> I don't complete understand the relationship between a normal bios and the
> kernel, i think that the bios it's has to pass some data to the kernel, if
> that's true ¿how exactly is that data passed to the kernel?
>
> In linuxbios, how it's this issue handle?
>
> PD: sorry for my english
> Thanks
> -- 
> Jorge Eduardo Cardona
> [e-mail]
>
> Linux registered user #391186
> Registered machine    #291871
>
> LinuxBIOS mailing list
> [e-mail]
> http://www.openbios.org/mailman/listinfo/linuxbios

[Stefan Reinauer]

* Jorge Cardona  [050701 18:29]:
> Hi.
> I'm new in this, and i'm reading the source and  i have a question, which one
> it's exactly the first instruction that the processor execute when the pc is
> booting?, in which file is it?

Here's a little summary I wrote a while ago.. don't know if it is still
correct and complete.
> I don't complete understand the relationship between a normal bios and the
> kernel, i think that the bios it's has to pass some data to the kernel, if
> that's true ¿how exactly is that data passed to the kernel?

There are several possibilities. Either the information is placed at
well known addresses or in a certain address range, using a signature so
the kernel can find it. 
Or the Kernel does callbacks (intXX).
> In linuxbios, how it's this issue handle?

LinuxBIOS provides tables: ACPI, MPTABLE, PIRQ table, and a LinuxBIOS
table which should some day obsolete all the other tables.

No callbacks. They are considered unsafe and error prone.

Stefan

[yhlu]

early_mtrr.inc is not needed, and it is merged into car.inc and car_post.c

YH

On 8/5/05, Stefan Reinauer  wrote:
> Jorge Cardona  [050701 18:29]:
> > Hi.
> > I'm new in this, and i'm reading the source and  i have a question, which one
> > it's exactly the first instruction that the processor execute when the pc is
> > booting?, in which file is it?
>
> Here's a little summary I wrote a while ago.. don't know if it is still
> correct and complete.
> > I don't complete understand the relationship between a normal bios and the
> > kernel, i think that the bios it's has to pass some data to the kernel, if
> > that's true ¿how exactly is that data passed to the kernel?
>
> There are several possibilities. Either the information is placed at
> well known addresses or in a certain address range, using a signature so
> the kernel can find it.
> Or the Kernel does callbacks (intXX).
> > In linuxbios, how it's this issue handle?
>
> LinuxBIOS provides tables: ACPI, MPTABLE, PIRQ table, and a LinuxBIOS
> table which should some day obsolete all the other tables.
>
> No callbacks. They are considered unsafe and error prone.
>
> Stefan
>
> LinuxBIOS mailing list
> [e-mail]
> http://www.openbios.org/mailman/listinfo/linuxbios