diff options
Diffstat (limited to 'UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c')
| -rw-r--r-- | UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c | 77 |
1 files changed, 1 insertions, 76 deletions
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c index 5952295126..940d83a92f 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuException.c @@ -170,84 +170,9 @@ InitializeSeparateExceptionStacks ( IN OUT UINTN *BufferSize
)
{
- CPU_EXCEPTION_INIT_DATA EssData;
- IA32_DESCRIPTOR Idtr;
- IA32_DESCRIPTOR Gdtr;
- UINTN NeedBufferSize;
- UINTN StackTop;
- UINT8 *NewGdtTable;
-
- //
- // X64 needs only one TSS of current task working for all exceptions
- // because of its IST feature. IA32 needs one TSS for each exception
- // in addition to current task. To simplify the code, we report the
- // needed memory for IA32 case to cover both IA32 and X64 exception
- // stack switch.
- //
- // Layout of memory needed for each processor:
- // --------------------------------
- // | Alignment | (just in case)
- // --------------------------------
- // | |
- // | Original GDT |
- // | |
- // --------------------------------
- // | Current task descriptor |
- // --------------------------------
- // | |
- // | Exception task descriptors | X ExceptionNumber
- // | |
- // --------------------------------
- // | Current task-state segment |
- // --------------------------------
- // | |
- // | Exception task-state segment | X ExceptionNumber
- // | |
- // --------------------------------
- //
-
if ((Buffer == NULL) && (BufferSize == NULL)) {
return EFI_UNSUPPORTED;
}
- if (BufferSize == NULL) {
- return EFI_INVALID_PARAMETER;
- }
-
- AsmReadGdtr (&Gdtr);
- //
- // Total needed size includes stack size, new GDT table size, TSS size.
- // Add another DESCRIPTOR size for alignment requiremet.
- //
- NeedBufferSize = CPU_STACK_SWITCH_EXCEPTION_NUMBER * CPU_KNOWN_GOOD_STACK_SIZE +
- CPU_TSS_DESC_SIZE + Gdtr.Limit + 1 +
- CPU_TSS_SIZE +
- sizeof (IA32_TSS_DESCRIPTOR);
- if (*BufferSize < NeedBufferSize) {
- *BufferSize = NeedBufferSize;
- return EFI_BUFFER_TOO_SMALL;
- }
-
- if (Buffer == NULL) {
- return EFI_INVALID_PARAMETER;
- }
-
- StackTop = (UINTN)Buffer + CPU_STACK_SWITCH_EXCEPTION_NUMBER * CPU_KNOWN_GOOD_STACK_SIZE;
- NewGdtTable = ALIGN_POINTER (StackTop, sizeof (IA32_TSS_DESCRIPTOR));
-
- AsmReadIdtr (&Idtr);
- EssData.KnownGoodStackTop = StackTop;
- EssData.KnownGoodStackSize = CPU_KNOWN_GOOD_STACK_SIZE;
- EssData.StackSwitchExceptions = CPU_STACK_SWITCH_EXCEPTION_LIST;
- EssData.StackSwitchExceptionNumber = CPU_STACK_SWITCH_EXCEPTION_NUMBER;
- EssData.IdtTable = (VOID *)Idtr.Base;
- EssData.IdtTableSize = Idtr.Limit + 1;
- EssData.GdtTable = NewGdtTable;
- EssData.GdtTableSize = CPU_TSS_DESC_SIZE + Gdtr.Limit + 1;
- EssData.ExceptionTssDesc = NewGdtTable + Gdtr.Limit + 1;
- EssData.ExceptionTssDescSize = CPU_TSS_DESC_SIZE;
- EssData.ExceptionTss = NewGdtTable + Gdtr.Limit + 1 + CPU_TSS_DESC_SIZE;
- EssData.ExceptionTssSize = CPU_TSS_SIZE;
-
- return ArchSetupExceptionStack (&EssData);
+ return ArchSetupExceptionStack (Buffer, BufferSize);
}
|