From 36b0754712933063201eb84d5a67d517862b13f7 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Fri, 7 Dec 2018 11:52:49 +0100 Subject: [PATCH] MdeModulePkg/Dxe/Gcd: disregard memory above MAX_ALLOC_ADDRESS Update the GCD memory map initialization code so it disregards memory that is not addressable by the CPU at boot time. This only affects the first memory descriptor that is added, other memory descriptors are permitted that describe memory ranges that may be accessible to the CPU itself only when executing under the OS. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel Reviewed-by: Jian J Wang --- MdeModulePkg/Core/Dxe/Gcd/Gcd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c index a76d2db73c..504e14a74e 100644 --- a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c +++ b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c @@ -2284,7 +2284,7 @@ CoreInitializeMemoryServices ( // region that is big enough to initialize the DXE core. Always skip the PHIT Resource HOB. // The max address must be within the physically addressible range for the processor. // - HighAddress = MAX_ADDRESS; + HighAddress = MAX_ALLOC_ADDRESS; for (Hob.Raw = *HobStart; !END_OF_HOB_LIST(Hob); Hob.Raw = GET_NEXT_HOB(Hob)) { // // Skip the Resource Descriptor HOB that contains the PHIT @@ -2300,7 +2300,7 @@ CoreInitializeMemoryServices ( } // - // Skip Resource Descriptor HOBs that do not describe tested system memory below MAX_ADDRESS + // Skip Resource Descriptor HOBs that do not describe tested system memory below MAX_ALLOC_ADDRESS // ResourceHob = Hob.ResourceDescriptor; if (ResourceHob->ResourceType != EFI_RESOURCE_SYSTEM_MEMORY) { @@ -2309,14 +2309,14 @@ CoreInitializeMemoryServices ( if ((ResourceHob->ResourceAttribute & MEMORY_ATTRIBUTE_MASK) != TESTED_MEMORY_ATTRIBUTES) { continue; } - if ((ResourceHob->PhysicalStart + ResourceHob->ResourceLength) > (EFI_PHYSICAL_ADDRESS)MAX_ADDRESS) { + if ((ResourceHob->PhysicalStart + ResourceHob->ResourceLength) > (EFI_PHYSICAL_ADDRESS)MAX_ALLOC_ADDRESS) { continue; } // // Skip Resource Descriptor HOBs that are below a previously found Resource Descriptor HOB // - if (HighAddress != (EFI_PHYSICAL_ADDRESS)MAX_ADDRESS && ResourceHob->PhysicalStart <= HighAddress) { + if (HighAddress != (EFI_PHYSICAL_ADDRESS)MAX_ALLOC_ADDRESS && ResourceHob->PhysicalStart <= HighAddress) { continue; } -- 2.39.2