diff options
| -rw-r--r-- | UefiCpuPkg/UefiCpuPkg.dec | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 4e71a11ae0..5d5342ded6 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -262,6 +262,14 @@ # @Prompt BSP Broadcast Method for the first-time wakeup of APs
gUefiCpuPkgTokenSpaceGuid.PcdFirstTimeWakeUpAPsBySipi|TRUE|BOOLEAN|0x30002007
+ ## The max mapping address in page table before Temp Ram Exit.
+ # After physical memory is initialized and before Temp Ram Exit, the physical memory is in UC state.
+ # The PCD controls the page table max mapping address in physical memory before Temp Ram Exit
+ # because creating a big page table in UC physical memory to cover the entire memory space
+ # is slow. The value of 0xFFFFFFFFFFFFFFFF, then firmware will map entire physical address space.
+ # @Prompt Configure max mapping address in page table before Temp Ram Exit.
+ gUefiCpuPkgTokenSpaceGuid.PcdMaxMappingAddressBeforeTempRamExit|0xFFFFFFFFFFFFFFFF|UINT64|0x30002008
+
[PcdsFixedAtBuild, PcdsPatchableInModule]
## This value is the CPU Local APIC base address, which aligns the address on a 4-KByte boundary.
# @Prompt Configure base address of CPU Local APIC
|