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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.tan@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Reviewed-by: Abner Chang <abner.chang@amd.com>
This commit is contained in:
Tan, Dun 2022-09-29 17:06:51 +08:00 committed by mergify[bot]
parent 406ad0582a
commit a670f12a74
2 changed files with 8 additions and 2 deletions
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5
UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ArchExceptionHandler.c
View File

@ -215,7 +215,10 @@ ArchSetupExceptionStack (
// Fixup exception task descriptor and task-state segment
//
AsmGetTssTemplateMap (&TemplateMap);
StackTop = StackTop - CPU_STACK_ALIGNMENT;
//
// Plus 1 byte is for compact stack layout in case StackTop is already aligned.
//
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) {

5
UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
View File

@ -223,7 +223,10 @@ ArchSetupExceptionStack (
// Fixup exception task descriptor and task-state segment
//
ZeroMem (Tss, sizeof (*Tss));
StackTop = StackTop - CPU_STACK_ALIGNMENT;
//
// Plus 1 byte is for compact stack layout in case StackTop is already aligned.
//
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) {