[PATCH v1 1/1] ArmPkg/ArmMmuLib: Explicitly cast UINT32 data conversions

[PATCH v1 1/1] ArmPkg/ArmMmuLib: Explicitly cast UINT32 data conversions

[Michael Kubacki]

From: Michael Kubacki <michael.kubacki@microsoft.com>

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2835

There's several occurrences of a UINT64 or an EFI_PHYSICAL_ADDRESS
being assigned to a UINT32 value in ArmMmuLib. These result in
warning C4244 in VS2019:

warning C4244: '=': conversion from 'UINT64' to 'UINT32', possible
loss of data

warning C4244: '=': conversion from 'EFI_PHYSICAL_ADDRESS' to
'UINT32', possible loss of data

This change explicitly casts the values to UINT32.

These can be reproduced with the following build command:
build -b DEBUG -a ARM -t VS2019 -p ArmPkg/ArmPkg.dsc
-m ArmPkg/Library/ArmMmuLib/ArmMmuBaseLib.inf

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
---
 ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c   | 4 ++--
 ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibUpdate.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c b/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c
index 15e836e75e8e..fb40925c9a2c 100644
--- a/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c
+++ b/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c
@@ -225,7 +225,7 @@ FillTranslationTable (
     return;
   }
 
-  PhysicalBase = MemoryRegion->PhysicalBase;
+  PhysicalBase = (UINT32) MemoryRegion->PhysicalBase;
   RemainLength = MIN(MemoryRegion->Length, SIZE_4GB - PhysicalBase);
 
   switch (MemoryRegion->Attributes) {
@@ -291,7 +291,7 @@ FillTranslationTable (
       PhysicalBase += TT_DESCRIPTOR_SECTION_SIZE;
       RemainLength -= TT_DESCRIPTOR_SECTION_SIZE;
     } else {
-      PageMapLength = MIN (RemainLength, TT_DESCRIPTOR_SECTION_SIZE -
+      PageMapLength = MIN ((UINT32) RemainLength, TT_DESCRIPTOR_SECTION_SIZE -
                                          (PhysicalBase % TT_DESCRIPTOR_SECTION_SIZE));
 
       // Case: Physical address aligned on the Section Size (1MB) && the length
diff --git a/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibUpdate.c b/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibUpdate.c
index 1ec734deab18..45039c852585 100644
--- a/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibUpdate.c
+++ b/ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibUpdate.c
@@ -152,7 +152,7 @@ UpdatePageEntries (
   FirstLevelTable = (ARM_FIRST_LEVEL_DESCRIPTOR *)ArmGetTTBR0BaseAddress ();
 
   // Calculate number of 4KB page table entries to change
-  NumPageEntries = Length / TT_DESCRIPTOR_PAGE_SIZE;
+  NumPageEntries = (UINT32) (Length / TT_DESCRIPTOR_PAGE_SIZE);
 
   // Iterate for the number of 4KB pages to change
   Offset = 0;
@@ -288,7 +288,7 @@ UpdateSectionEntries (
   ASSERT (FirstLevelIdx < TRANSLATION_TABLE_SECTION_COUNT);
 
   // calculate number of 1MB first level entries this applies to
-  NumSections = Length / TT_DESCRIPTOR_SECTION_SIZE;
+  NumSections = (UINT32) (Length / TT_DESCRIPTOR_SECTION_SIZE);
 
   // iterate through each descriptor
   for(i=0; i<NumSections; i++) {
-- 
2.28.0.windows.1