[PATCH 09/14] OvmfPkg/PlatformPei: Refactor InitializeRamRegions

["Min Xu" <min.m.xu@intel.com>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3863

InitializeRamRegions is refactored into 3 calls:
 - PlatformQemuInitializeRam
 - SevInitializeRam
 - PlatformQemuInitializeRamForS3

SevInitializeRam is not in PlatformInitLib. Because in the first stage
PlatformInitLib only support the basic platform featues.

PlatformQemuInitializeRamForS3 wraps the code which was previously in
InitializeRamRegions (many code in 2 if-checks).

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/PlatformPei/MemDetect.c | 40 ++++++++++++++++++++-------------
 OvmfPkg/PlatformPei/Platform.c  |  2 +-
 OvmfPkg/PlatformPei/Platform.h  |  3 ++-
 3 files changed, 28 insertions(+), 17 deletions(-)

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 33c39228e448..5709766f86f3 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -163,7 +163,7 @@ PlatformQemuUc32BaseInitialization (
   // variable MTRR suffices by truncating the size to a whole power of two,
   // while keeping the end affixed to 4GB. This will round the base up.
   //
-  LowerMemorySize           = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
+  LowerMemorySize           = PlatformGetSystemMemorySizeBelow4gb (PlatformInfoHob);
   PlatformInfoHob->Uc32Size = GetPowerOfTwo32 ((UINT32)(SIZE_4GB - LowerMemorySize));
   PlatformInfoHob->Uc32Base = (UINT32)(SIZE_4GB - PlatformInfoHob->Uc32Size);
   //
@@ -374,7 +374,8 @@ GetHighestSystemMemoryAddressFromPvhMemmap (
 }
 
 UINT32
-GetSystemMemorySizeBelow4gb (
+EFIAPI
+PlatformGetSystemMemorySizeBelow4gb (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
@@ -763,7 +764,7 @@ PublishPeiMemory (
   UINT32                S3AcpiReservedMemoryBase;
   UINT32                S3AcpiReservedMemorySize;
 
-  LowerMemorySize = GetSystemMemorySizeBelow4gb (&mPlatformInfoHob);
+  LowerMemorySize = PlatformGetSystemMemorySizeBelow4gb (&mPlatformInfoHob);
   if (mPlatformInfoHob.SmmSmramRequire) {
     //
     // TSEG is chipped from the end of low RAM
@@ -873,7 +874,7 @@ QemuInitializeRamBelow1gb (
 **/
 STATIC
 VOID
-QemuInitializeRam (
+PlatformQemuInitializeRam (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
@@ -887,7 +888,7 @@ QemuInitializeRam (
   //
   // Determine total memory size available
   //
-  LowerMemorySize = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
+  LowerMemorySize = PlatformGetSystemMemorySizeBelow4gb (PlatformInfoHob);
 
   if (PlatformInfoHob->BootMode == BOOT_ON_S3_RESUME) {
     //
@@ -997,19 +998,12 @@ QemuInitializeRam (
   }
 }
 
-/**
-  Publish system RAM and reserve memory regions
-
-**/
+STATIC
 VOID
-InitializeRamRegions (
+PlatformQemuInitializeRamForS3 (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
-  QemuInitializeRam (PlatformInfoHob);
-
-  SevInitializeRam ();
-
   if (PlatformInfoHob->S3Supported && (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME)) {
     //
     // This is the memory range that will be used for PEI on S3 resume
@@ -1115,7 +1109,7 @@ InitializeRamRegions (
       //
       TsegSize = PlatformInfoHob->Q35TsegMbytes * SIZE_1MB;
       BuildMemoryAllocationHob (
-        GetSystemMemorySizeBelow4gb (PlatformInfoHob) - TsegSize,
+        PlatformGetSystemMemorySizeBelow4gb (PlatformInfoHob) - TsegSize,
         TsegSize,
         EfiReservedMemoryType
         );
@@ -1154,3 +1148,19 @@ InitializeRamRegions (
  #endif
   }
 }
+
+/**
+  Publish system RAM and reserve memory regions
+
+**/
+VOID
+InitializeRamRegions (
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  )
+{
+  PlatformQemuInitializeRam (PlatformInfoHob);
+
+  SevInitializeRam ();
+
+  PlatformQemuInitializeRamForS3 (PlatformInfoHob);
+}
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 0bf92e117bee..3e02ba2c9fc4 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -79,7 +79,7 @@ MemMapInitialization (
     return;
   }
 
-  TopOfLowRam  = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
+  TopOfLowRam  = PlatformGetSystemMemorySizeBelow4gb (PlatformInfoHob);
   PciExBarBase = 0;
   if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     //
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index b5e831aa68e2..494836c3efe4 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -33,7 +33,8 @@ PublishPeiMemory (
   );
 
 UINT32
-GetSystemMemorySizeBelow4gb (
+EFIAPI
+PlatformGetSystemMemorySizeBelow4gb (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   );
 
-- 
2.29.2.windows.2