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ArmVirtPkg/MemoryInitPeiLib: split memory HOB based on MAX_ALLOC_ADDRESS 

The current ArmVirtMemoryInitPeiLib code splits the memory region passed
via PcdSystemMemoryBase/PcdSystemMemorySize in two if the region extends
beyond the MAX_ADDRESS limit. This was introduced for 32-bit ARM, which
may support more than 4 GB of physical address space, but cannot address
all of it via a 1:1 mapping, and a single region that is not mappable
in its entirety is unusable by the PEI core.

AArch64 is in a similar situation now: platforms may support more than
256 TB of physical address space, but only 256 TB is addressable by the
CPU, and so a memory region that extends from below this limit to above
it should be split.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Ard Biesheuvel 2018-12-07 12:01:25 +01:00
parent 6bd42402f7
commit 4a1500db2b
1 changed files with 4 additions and 4 deletions
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8
ArmVirtPkg/Library/ArmVirtMemoryInitPeiLib/ArmVirtMemoryInitPeiLib.c
View File

@ -75,18 +75,18 @@ MemoryPeim (
SystemMemoryTop = PcdGet64 (PcdSystemMemoryBase) +
PcdGet64 (PcdSystemMemorySize);
if (SystemMemoryTop - 1 > MAX_ADDRESS) {
if (SystemMemoryTop - 1 > MAX_ALLOC_ADDRESS) {
BuildResourceDescriptorHob (
EFI_RESOURCE_SYSTEM_MEMORY,
ResourceAttributes,
PcdGet64 (PcdSystemMemoryBase),
(UINT64)MAX_ADDRESS - PcdGet64 (PcdSystemMemoryBase) + 1
(UINT64)MAX_ALLOC_ADDRESS - PcdGet64 (PcdSystemMemoryBase) + 1
);
BuildResourceDescriptorHob (
EFI_RESOURCE_SYSTEM_MEMORY,
ResourceAttributes,
(UINT64)MAX_ADDRESS + 1,
SystemMemoryTop - MAX_ADDRESS - 1
(UINT64)MAX_ALLOC_ADDRESS + 1,
SystemMemoryTop - MAX_ALLOC_ADDRESS - 1
);
} else {
BuildResourceDescriptorHob (