Reviewed-by: Ray Ni <ray...@intel.com>
> -----Original Message-----
> From: Tan, Dun <dun....@intel.com>
> Sent: Wednesday, September 28, 2022 9:52 AM
> To: devel@edk2.groups.io
> Cc: Dong, Eric <eric.d...@intel.com>; Ni, Ray <ray...@intel.com>; Kumar,
> Rahul R <rahul.r.ku...@intel.com>
> Subject: [PATCH] UefiCpuPkg/CpuExceptionHandlerLib: Code optimization to
> allow bigger stack
>
> This commit is a code optimization to allow bigger seperate stack size in
> ArchSetupExceptionStack. In previous code logic, CPU_STACK_ALIGNMENT
> bytes
> will be wasted if StackTop is already CPU_STACK_ALIGNMENT aligned.
>
> Signed-off-by: Dun Tan <dun....@intel.com>
> Cc: Eric Dong <eric.d...@intel.com>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Rahul Kumar <rahul1.ku...@intel.com>
> ---
> UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.c |
> 2 +-
> UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c |
> 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.c
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.
> c
> index 8c398ebc5b..c8fa30a32f 100644
> ---
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.c
> +++
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.
> c
> @@ -215,7 +215,7 @@ ArchSetupExceptionStack (
> // Fixup exception task descriptor and task-state segment
> //
> AsmGetTssTemplateMap (&TemplateMap);
> - StackTop = StackTop - CPU_STACK_ALIGNMENT;
> + StackTop = StackTop - CPU_STACK_ALIGNMENT + 1;
> StackTop = (UINTN)ALIGN_POINTER (StackTop, CPU_STACK_ALIGNMENT);
> IdtTable = (IA32_IDT_GATE_DESCRIPTOR *)Idtr.Base;
> for (Index = 0; Index < CPU_STACK_SWITCH_EXCEPTION_NUMBER;
> ++Index) {
> diff --git
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
> index 80e9f08e5b..74b2193cb0 100644
> ---
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
> +++
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
> @@ -223,7 +223,7 @@ ArchSetupExceptionStack (
> // Fixup exception task descriptor and task-state segment
> //
> ZeroMem (Tss, sizeof (*Tss));
> - StackTop = StackTop - CPU_STACK_ALIGNMENT;
> + StackTop = StackTop - CPU_STACK_ALIGNMENT + 1;
> StackTop = (UINTN)ALIGN_POINTER (StackTop, CPU_STACK_ALIGNMENT);
> IdtTable = (IA32_IDT_GATE_DESCRIPTOR *)Idtr.Base;
> for (Index = 0; Index < CPU_STACK_SWITCH_EXCEPTION_NUMBER;
> ++Index) {
> --
> 2.31.1.windows.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#94453): https://edk2.groups.io/g/devel/message/94453
Mute This Topic: https://groups.io/mt/93964451/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
