Re: [Xen-devel] Re: [PATCH] SeaBIOS/Xen: Compute the low RAM memory size in the BDA according to the e820

[Keir Fraser <keir@xxxxxxx>]

On 14/11/2011 08:53, "Keir Fraser" <keir.xen@xxxxxxxxx> wrote:

> On 14/11/2011 03:36, "Kevin O'Connor" <kevin@xxxxxxxxxxxx> wrote:
> 
>> On Xen, the PCI init code isn't used, so assuming this struct doesn't
>> need to live in real "ram", I think it could live just about anywhere
>> past the end of ram.  Even with pciinit.c, addresses over 0xfc00000
>> (with the exception of a few bytes for hpet, apic, ioapic, and bios
>> image) could be used.
> 
> I suggest we stick it at FC000000, and shift hvmloader's mem_alloc()
> starting address up by one page to FC001000. The acpi build code will have
> to manually mem_hole_populate_ram() that one page before writing to it. This
> can then be documented in hvmloader/config.h which contains a description
> of, and defines for, the system memory map. This is by far the easiest
> solution to this problem; manually crafting an SSDT is a right pain in the
> arse, whereas this is maybe a 5-line patch.

Like the attached patch (untested), which is a bit larger than anticipated,
but actually allows code to be net deleted. :-)

 -- Keir

>  -- Keir
> 
>> -Kevin
>> 
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> 
>

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