[PATCH 3/3] MdeModulePkg/BdsDxe: Set RuntimeServicesSupported variable

["Jeff Brasen" <jbrasen@nvidia.com>]

Add support for initializing and setting the UEFI 2.8 global variable
RuntimeServicesSupported based on the value of a PCD.

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
---
 MdeModulePkg/MdeModulePkg.dec            | 18 ++++++++++++++++
 MdeModulePkg/Universal/BdsDxe/BdsDxe.inf |  1 +
 MdeModulePkg/Universal/BdsDxe/BdsEntry.c | 35 +++++++++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 41b9e70..a1767e4 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -2003,6 +2003,24 @@
   # @Prompt Capsule On Disk relocation device path.
   gEfiMdeModulePkgTokenSpaceGuid.PcdCodRelocationDevPath|{0xFF}|VOID*|0x0000002f
 
+  ## Bitmask of supported runtime services<BR>
+  #  BIT0  - GetTime
+  #  BIT1  - SetTime
+  #  BIT2  - GetWakeupTime
+  #  BIT3  - SetWakeupTime
+  #  BIT4  - GetVariable
+  #  BIT5  - GetNextVariableName
+  #  BIT6  - SetVariable
+  #  BIT7  - SetVirtualAddressMap
+  #  BIT8  - ConvertPointer
+  #  BIT9  - GetNextHighMonotonicCount
+  #  BIT10 - ResetSystem
+  #  BIT11 - UpdateCapsule
+  #  BIT12 - QueryCapsuleCapabilites
+  #  BIT13 - QueryVariableInfo
+  # @Prompt Supported Runtime services bitmask.
+  gEfiMdeModulePkgTokenSpaceGuid.PcdRuntimeServicesSupported|0x3FFF|UINT16|0x00000030
+
 [PcdsPatchableInModule]
   ## Specify memory size with page number for PEI code when
   #  Loading Module at Fixed Address feature is enabled.
diff --git a/MdeModulePkg/Universal/BdsDxe/BdsDxe.inf b/MdeModulePkg/Universal/BdsDxe/BdsDxe.inf
index 9310b4d..e4ba9be 100644
--- a/MdeModulePkg/Universal/BdsDxe/BdsDxe.inf
+++ b/MdeModulePkg/Universal/BdsDxe/BdsDxe.inf
@@ -97,6 +97,7 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdTestKeyUsed                       ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdCapsuleOnDiskSupport              ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdPlatformRecoverySupport           ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdRuntimeServicesSupported          ## CONSUMES
 
 [Depex]
   TRUE
diff --git a/MdeModulePkg/Universal/BdsDxe/BdsEntry.c b/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
index d387dbe..16bc593 100644
--- a/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
+++ b/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
@@ -40,7 +40,8 @@ CHAR16  *mReadOnlyVariables[] = {
   EFI_LANG_CODES_VARIABLE_NAME,
   EFI_BOOT_OPTION_SUPPORT_VARIABLE_NAME,
   EFI_HW_ERR_REC_SUPPORT_VARIABLE_NAME,
-  EFI_OS_INDICATIONS_SUPPORT_VARIABLE_NAME
+  EFI_OS_INDICATIONS_SUPPORT_VARIABLE_NAME,
+  EFI_RUNTIME_SERVICES_SUPPORTED_VARIABLE_NAME
   };
 
 CHAR16 *mBdsLoadOptionName[] = {
@@ -626,6 +627,33 @@ BdsFormalizeOSIndicationVariable (
 
 /**
 
+  Formalize RuntimeServicesSupported variable.
+
+**/
+VOID
+BdsFormalizeRuntimeServicesSupportedVariable (
+  VOID
+  )
+{
+  EFI_STATUS                      Status;
+  UINT16                          RuntimeServicesSupported;
+
+  RuntimeServicesSupported = PcdGet16 (PcdRuntimeServicesSupported);
+  Status = gRT->SetVariable (
+                  EFI_RUNTIME_SERVICES_SUPPORTED_VARIABLE_NAME,
+                  &gEfiGlobalVariableGuid,
+                  EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+                  sizeof(RuntimeServicesSupported),
+                  &RuntimeServicesSupported
+                  );
+  //
+  // Platform needs to make sure setting volatile variable before calling 3rd party code shouldn't fail.
+  //
+  ASSERT_EFI_ERROR (Status);
+}
+
+/**
+
   Validate variables.
 
 **/
@@ -645,6 +673,11 @@ BdsFormalizeEfiGlobalVariable (
   // Validate OSIndication related variable.
   //
   BdsFormalizeOSIndicationVariable ();
+
+  //
+  // Validate Runtime Services Supported variable.
+  //
+  BdsFormalizeRuntimeServicesSupportedVariable ();
 }
 
 /**
-- 
2.7.4