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PI Enabling: the address of PeiServices Pointer should be

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1) Set to preceding of IDT table in PeiCore's entry
2) Migrate to preceding of new memory IDT table when memory is discovery

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4059 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
klu2
2007-10-09 08:16:53 +00:00
parent d173d9c761
commit 81c7803cf4
10 changed files with 165 additions and 19 deletions
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61
MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointer.c
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@@ -33,9 +33,66 @@ GetPeiServicesTablePointer (
)
{
EFI_PEI_SERVICES **PeiServices;
PeiServices = (EFI_PEI_SERVICES **) AsmPeiSevicesTablePointer ();
IA32_DESCRIPTOR Idtr;
AsmReadIdtr (&Idtr);
PeiServices = (EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - 4));
ASSERT (PeiServices != NULL);
return PeiServices;
}
/**
The function returns the pointer to PeiServicee following
PI1.0.
For IA32, the four-bytes field immediately prior to new IDT
base addres is used to save the EFI_PEI_SERVICES**.
For x64, the eight-bytes field immediately prior to new IDT
base addres is used to save the EFI_PEI_SERVICES**
@retval The pointer to PeiServices.
**/
VOID
EFIAPI
SetPeiServicesTablePointer (
EFI_PEI_SERVICES ** PeiServicesTablePointer
)
{
IA32_DESCRIPTOR Idtr;
AsmReadIdtr (&Idtr);
(*(UINTN*)(Idtr.Base - 4)) = (UINTN)PeiServicesTablePointer;
}
/**
After memory initialization in PEI phase, the IDT table in temporary memory should
be migrated to memory, and the address of PeiServicesPointer also need to be updated
immediately preceding the new IDT table.
@param PeiServices The address of PeiServices pointer.
**/
VOID
MigrateIdtTable (
IN EFI_PEI_SERVICES **PeiServices
)
{
UINTN Size;
VOID *NewBase;
EFI_STATUS Status;
IA32_DESCRIPTOR Idtr;
AsmReadIdtr (&Idtr);
Size = sizeof(UINTN) + (Idtr.Limit + 1);
Status = PeiServicesAllocatePool (Size, &NewBase);
ASSERT_EFI_ERROR (Status);
CopyMem ((VOID*)((UINTN)NewBase + sizeof(UINTN)), (VOID*)Idtr.Base, (Idtr.Limit + 1));
Idtr.Base = (UINTN)NewBase + sizeof(UINTN);
AsmWriteIdtr (&Idtr);
SetPeiServicesTablePointer(PeiServices);
}