On 9 September 2015 at 15:59, Laszlo Ersek <ler...@redhat.com> wrote:
> On 09/08/15 19:35, Ard Biesheuvel wrote:
>> When executing on a LPAE capable 32-bit ARM platform, we support
>> up to 40 bits of physical address space so set PcdPrePiCpuMemorySize
>> accordingly.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.0
>> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
>> ---
>> ArmVirtPkg/ArmVirt.dsc.inc | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/ArmVirtPkg/ArmVirt.dsc.inc b/ArmVirtPkg/ArmVirt.dsc.inc
>> index b49c1bfb8b04..c1b78be84e74 100644
>> --- a/ArmVirtPkg/ArmVirt.dsc.inc
>> +++ b/ArmVirtPkg/ArmVirt.dsc.inc
>> @@ -371,6 +371,9 @@ [PcdsFixedAtBuild.common]
>> gArmVirtTokenSpaceGuid.PcdTerminalTypeGuidBuffer|{0x80, 0x6d, 0x91, 0x7d,
>> 0xb1, 0x5b, 0x8c, 0x45, 0xa4, 0x8f, 0xe2, 0x5f, 0xdd, 0x51, 0xef, 0x94}
>> !endif
>>
>> +[PcdsFixedAtBuild.ARM]
>> + gEmbeddedTokenSpaceGuid.PcdPrePiCpuMemorySize|40
>> +
>> [Components.common]
>> #
>> # Networking stack
>>
>
> Right, the "ArmPkg/Drivers/CpuPei/CpuPei.inf" builds the CPU HOB based
> on this, and then the DXE core determines the size of the GCD Memory
> Space Map's first (= "all is nonexistent") entry from that.
>
Indeed. Otherwise, memory above 4 GB just gets ignored, which means
its existence does not get advertised to the OS either.
> Plus, you probably don't have to care about any size increase in page
> tables that are allocated from the permanent PEI RAM (cf. SVN rev 17719).
>
The 1:1 mapping only goes to 4 GB, so anything beyond that is never
mapped anyway.
> Reviewed-by: Laszlo Ersek <ler...@redhat.com>
Thanks!
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