Re: BGRT Pointer in System RAM

[Parag Warudkar]

On Mon, Jul 15, 2013 at 7:56 PM, Parag Warudkar <parag.lkml@xxxxxxxxx> wrote:
> On Mon, Jul 15, 2013 at 7:04 PM, Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote:
>
>> We do need to handle the case of a valid pointer into memory that e820
>> calls system RAM, as well as the case of a valid pointer into memory
>> reserved for the BIOS or similar, but not the case of an invalid
>> pointer.
>
> Would that be as simple as
>
>                      page_is_ram(

Damn shortcuts -
                        virt_addr = phys_to_virt(image->base_address);
                        if(page_is_ram(virt_to_page(virt_addr))) {
                            //direct read from virt addr
                        }

Would that suffice for the System RAM case or some other MM trickery
is involved?

Thanks,
Parag
--
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/