UefiCpuPkg: Add PCD PcdCpuApLoopMode

This new PCD is used to specify the AP loop mode during POST phase.

The value 1 means we will place AP in the Hlt-Loop state by HLT instruction.
BSP need to send INIT-SIPI-SIPI to wake up APs.

The value 2 means we will place AP in the deepest C-state by MWAIT instruction.
BSP need to modify the monitor buffer by MONITOR instruction to wake up APs.

The value 3 means we will place AP in the Run-loop state. APs are running.
BSP need to write one semaphore to wake up APs.

Contributed-under: TianoCore Contribution Agreement 1.0
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19341 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index a6941466891e80851d9d9637a778188c2f4c7aa3..0d42918427ea5f1c4ba51a87bd33c4bda3f327a9 100644 (file)
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -182,6 +182,14 @@
   ## Specifies the size of the microcode Region.\r
   # @Prompt Microcode Region size.\r
   gUefiCpuPkgTokenSpaceGuid.PcdCpuMicrocodePatchRegionSize|0x0|UINT64|0x00000006\r
+  ## Specifies the AP wait loop state during POST phase.\r
+  #  The value is defined as below.<BR><BR>\r
+  #  1: Place AP in the Hlt-Loop state.<BR>\r
+  #  2: Place AP in the Mwait-Loop state.<BR>\r
+  #  3: Place AP in the Run-Loop state.<BR>\r
+  # @Prompt The AP wait loop state.\r
+  # @ValidRange  0x80000001 | 1 - 3\r
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006\r
 \r
 [PcdsDynamic, PcdsDynamicEx]\r
   ## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.\r

diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index fd1e81226a3c58ac4508003bc0fc60cd289b3e33..2c74a92e06bb7715eac4628420be123aa9b54a74 100644 (file)
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -139,3 +139,7 @@
 \r
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuNumberOfReservedVariableMtrrs_HELP  #language en-US "Specifies the number of variable MTRRs reserved for OS use."\r
 \r
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_PROMPT  #language en-US "The AP wait loop state"\r
+\r
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_HELP  #language en-US "Specifies the AP wait loop state during POST phase."\r
+\r