Re: [edk2-devel] [PATCH v4 1/2] UefiPayloadPkg: Remove FP Init from UPL entry

["Lu, James" <james.lu@intel.com>]

Reviewed-by: James Lu <james.lu@intel.com>


Thanks,
James

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Dhaval Sharma
Sent: Wednesday, March 15, 2023 8:19 PM
To: devel@edk2.groups.io
Cc: Dong, Guo <guo.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Rhodes, Sean <sean@starlabs.systems>; Lu, James <james.lu@intel.com>; Guo, Gua <gua.guo@intel.com>
Subject: [edk2-devel] [PATCH v4 1/2] UefiPayloadPkg: Remove FP Init from UPL entry

According to UPL spec BL should initialize FP init meaning UPL does not need to initialize it. Besides this is arch specific init and needs to be moved out of UPL common flow. In order to not break current BL implementations, for now just moving the init to later point of time but for both x32 and x64 eventually this should be removed once BL impelement this logic.

Test: Verified booting  UEFI shell on coreboot on qemu.

Cc: Guo Dong <guo.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james.lu@intel.com>
Cc: Gua Guo <gua.guo@intel.com>

Signed-off-by: Dhaval Sharma <dhaval@rivosinc.com>

Reviewed-by: Gua Guo <gua.guo@intel.com>
---

Notes:
    v3:
    - Added FP initialization to X64 path as well
    v4:
    - Updated reviewed-by tag

 UefiPayloadPkg/UefiPayloadEntry/Ia32/DxeLoadFunc.c      | 3 +++
 UefiPayloadPkg/UefiPayloadEntry/UniversalPayloadEntry.c | 3 ---
 UefiPayloadPkg/UefiPayloadEntry/X64/DxeLoadFunc.c       | 3 +++
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/UefiPayloadPkg/UefiPayloadEntry/Ia32/DxeLoadFunc.c b/UefiPayloadPkg/UefiPayloadEntry/Ia32/DxeLoadFunc.c
index c66e56aee15a..9d2bfb2fa654 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/Ia32/DxeLoadFunc.c
+++ b/UefiPayloadPkg/UefiPayloadEntry/Ia32/DxeLoadFunc.c
@@ -268,6 +268,9 @@ HandOffToDxeCore (
   UINT32                   Index;
   X64_IDT_TABLE            *IdtTableForX64;
 
+  // Initialize floating point operating environment to be compliant with UEFI spec.
+  InitializeFloatingPointUnits ();
+
   //
   // Clear page 0 and mark it as allocated if NULL pointer detection is enabled.
   //
diff --git a/UefiPayloadPkg/UefiPayloadEntry/UniversalPayloadEntry.c b/UefiPayloadPkg/UefiPayloadEntry/UniversalPayloadEntry.c
index 46ee27c905e9..07f4c1d29686 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/UniversalPayloadEntry.c
+++ b/UefiPayloadPkg/UefiPayloadEntry/UniversalPayloadEntry.c
@@ -470,9 +470,6 @@ _ModuleEntryPoint (
     PrintHob (mHobList);
     );
 
-  // Initialize floating point operating environment to be compliant with UEFI spec.
-  InitializeFloatingPointUnits ();
-
   // Build HOB based on information from Bootloader
   Status = BuildHobs (BootloaderParameter, &DxeFv);
   ASSERT_EFI_ERROR (Status);
diff --git a/UefiPayloadPkg/UefiPayloadEntry/X64/DxeLoadFunc.c b/UefiPayloadPkg/UefiPayloadEntry/X64/DxeLoadFunc.c
index 346e3feb0459..84a6112ce64a 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/X64/DxeLoadFunc.c
+++ b/UefiPayloadPkg/UefiPayloadEntry/X64/DxeLoadFunc.c
@@ -40,6 +40,9 @@ HandOffToDxeCore (
   VOID   *GhcbBase;
   UINTN  GhcbSize;
 
+  // Initialize floating point operating environment to be compliant with UEFI spec.
+  InitializeFloatingPointUnits ();
+
   //
   // Clear page 0 and mark it as allocated if NULL pointer detection is enabled.
   //
--
2.40.0.rc0.57.g454dfcbddf