Commit b22a62be5cdc8fd19d87ec1ecfa5b28fb9be50ad * IntelFrameworkModule/LegacyBios:Use reserved memory for legacy data allocates reserved memory for holding legacy code/data.
But with PcdDxeNxMemoryProtectionPolicy set to certain value to forbid execution when code is in certain type of memory, it's possible that a platform forbids execution when code is in reserved memory. The patch calls GCD service to allow such case otherwise CPU exception may occur. Code execution in BSCode area should be enabled by platform by default. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ruiyu Ni <[email protected]> Cc: Star Zeng <[email protected]> Cc: Laszlo Ersek <[email protected]> Cc: Jian Wang <[email protected]> --- .../Csm/LegacyBiosDxe/LegacyBios.c | 28 ++++++++++++++++++---- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c index 8f14687b28..80efe40489 100644 --- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c +++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c @@ -64,8 +64,9 @@ AllocateLegacyMemory ( OUT EFI_PHYSICAL_ADDRESS *Result ) { - EFI_STATUS Status; - EFI_PHYSICAL_ADDRESS MemPage; + EFI_STATUS Status; + EFI_PHYSICAL_ADDRESS MemPage; + EFI_GCD_MEMORY_SPACE_DESCRIPTOR MemDesc; // // Allocate Pages of memory less <= StartPageAddress @@ -81,12 +82,29 @@ AllocateLegacyMemory ( // Do not ASSERT on Status error but let caller decide since some cases // memory is already taken but that is ok. // + if (!EFI_ERROR (Status)) { + if (MemoryType != EfiBootServicesCode) { + // + // Make sure that the buffer can be used to store code. + // + Status = gDS->GetMemorySpaceDescriptor (MemPage, &MemDesc); + if (!EFI_ERROR (Status) && (MemDesc.Attributes & EFI_MEMORY_XP) != 0) { + Status = gDS->SetMemorySpaceAttributes ( + MemPage, + EFI_PAGES_TO_SIZE (Pages), + MemDesc.Attributes & (~EFI_MEMORY_XP) + ); + } + if (EFI_ERROR (Status)) { + gBS->FreePages (MemPage, Pages); + } + } + } + if (!EFI_ERROR (Status)) { *Result = (EFI_PHYSICAL_ADDRESS) (UINTN) MemPage; } - // - // If reach here the status = EFI_SUCCESS - // + return Status; } -- 2.16.1.windows.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
