On 19 September 2017 at 01:07, Sakar Arora <[email protected]> wrote: > This change will create the possibility for memory space holding the UEFI > image to be over-written by the DXE core code, since this space will then be > available for allocation.
Yes. But why does this matter after the entire payload has been decompressed into memory already? > Any such change, if required, should be done just before booting the OS. > > -----Original Message----- > From: edk2-devel [mailto:[email protected]] On Behalf Of > Meenakshi Aggarwal > Sent: Tuesday, September 19, 2017 6:02 PM > To: [email protected]; [email protected]; > [email protected] > Subject: [edk2] [PATCH v2] PeiLib : Inform UEFI memory to Linux > > While creating Hob list, ArmPlatformPkg is hiding UEFI memory. > whereas this memory can be used by OS. > > This patch, allows OS to use UEFI code area. > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Udit Kumar <[email protected]> > Signed-off-by: Meenakshi Aggarwal <[email protected]> > --- > ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c | 69 > ------------------------- > 1 file changed, 69 deletions(-) > > diff --git a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c > b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c > index 2feb11f..d03214b 100644 > --- a/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c > +++ b/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c > @@ -70,11 +70,7 @@ MemoryPeim ( > { > ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable; > EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttributes; > - UINT64 ResourceLength; > EFI_PEI_HOB_POINTERS NextHob; > - EFI_PHYSICAL_ADDRESS FdTop; > - EFI_PHYSICAL_ADDRESS SystemMemoryTop; > - EFI_PHYSICAL_ADDRESS ResourceTop; > BOOLEAN Found; > > // Get Virtual Memory Map from the Platform Library @@ -121,71 +117,6 @@ > MemoryPeim ( > ); > } > > - // > - // Reserved the memory space occupied by the firmware volume > - // > - > - SystemMemoryTop = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemoryBase) + > (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemorySize); > - FdTop = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdFdBaseAddress) + > (EFI_PHYSICAL_ADDRESS)PcdGet32 (PcdFdSize); > - > - // EDK2 does not have the concept of boot firmware copied into DRAM. To > avoid the DXE > - // core to overwrite this area we must mark the region with the attribute > non-present > - if ((PcdGet64 (PcdFdBaseAddress) >= PcdGet64 (PcdSystemMemoryBase)) && > (FdTop <= SystemMemoryTop)) { > - Found = FALSE; > - > - // Search for System Memory Hob that contains the firmware > - NextHob.Raw = GetHobList (); > - while ((NextHob.Raw = GetNextHob (EFI_HOB_TYPE_RESOURCE_DESCRIPTOR, > NextHob.Raw)) != NULL) { > - if ((NextHob.ResourceDescriptor->ResourceType == > EFI_RESOURCE_SYSTEM_MEMORY) && > - (PcdGet64 (PcdFdBaseAddress) >= > NextHob.ResourceDescriptor->PhysicalStart) && > - (FdTop <= NextHob.ResourceDescriptor->PhysicalStart + > NextHob.ResourceDescriptor->ResourceLength)) > - { > - ResourceAttributes = NextHob.ResourceDescriptor->ResourceAttribute; > - ResourceLength = NextHob.ResourceDescriptor->ResourceLength; > - ResourceTop = NextHob.ResourceDescriptor->PhysicalStart + > ResourceLength; > - > - if (PcdGet64 (PcdFdBaseAddress) == > NextHob.ResourceDescriptor->PhysicalStart) { > - if (SystemMemoryTop == FdTop) { > - NextHob.ResourceDescriptor->ResourceAttribute = > ResourceAttributes & ~EFI_RESOURCE_ATTRIBUTE_PRESENT; > - } else { > - // Create the System Memory HOB for the firmware with the > non-present attribute > - BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY, > - ResourceAttributes & > ~EFI_RESOURCE_ATTRIBUTE_PRESENT, > - PcdGet64 (PcdFdBaseAddress), > - PcdGet32 (PcdFdSize)); > - > - // Top of the FD is system memory available for UEFI > - NextHob.ResourceDescriptor->PhysicalStart += PcdGet32(PcdFdSize); > - NextHob.ResourceDescriptor->ResourceLength -= > PcdGet32(PcdFdSize); > - } > - } else { > - // Create the System Memory HOB for the firmware with the > non-present attribute > - BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY, > - ResourceAttributes & > ~EFI_RESOURCE_ATTRIBUTE_PRESENT, > - PcdGet64 (PcdFdBaseAddress), > - PcdGet32 (PcdFdSize)); > - > - // Update the HOB > - NextHob.ResourceDescriptor->ResourceLength = PcdGet64 > (PcdFdBaseAddress) - NextHob.ResourceDescriptor->PhysicalStart; > - > - // If there is some memory available on the top of the FD then > create a HOB > - if (FdTop < NextHob.ResourceDescriptor->PhysicalStart + > ResourceLength) { > - // Create the System Memory HOB for the remaining region (top of > the FD) > - BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY, > - ResourceAttributes, > - FdTop, > - ResourceTop - FdTop); > - } > - } > - Found = TRUE; > - break; > - } > - NextHob.Raw = GET_NEXT_HOB (NextHob); > - } > - > - ASSERT(Found); > - } > - > // Build Memory Allocation Hob > InitMmu (MemoryTable); > > -- > 1.9.1 > > _______________________________________________ > edk2-devel mailing list > [email protected] > https://lists.01.org/mailman/listinfo/edk2-devel > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. 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