DxeHandoff.c

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#include "DxeIpl.h"
 
#include <Ppi/MemoryAttribute.h>
 
VOID
HandOffToDxeCore (
  IN EFI_PHYSICAL_ADDRESS  DxeCoreEntryPoint,
  IN EFI_PEI_HOB_POINTERS  HobList
  )
{
  VOID                        *BaseOfStack;
  VOID                        *TopOfStack;
  EFI_STATUS                  Status;
  EDKII_MEMORY_ATTRIBUTE_PPI  *MemoryPpi;
 
  //
  // Allocate 128KB for the Stack
  //
  BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  ASSERT (BaseOfStack != NULL);
 
  if (PcdGetBool (PcdSetNxForStack)) {
    Status = PeiServicesLocatePpi (
               &gEdkiiMemoryAttributePpiGuid,
               0,
               NULL,
               (VOID **)&MemoryPpi
               );
    ASSERT_EFI_ERROR (Status);
 
    Status = MemoryPpi->SetPermissions (
                          MemoryPpi,
                          (UINTN)BaseOfStack,
                          STACK_SIZE,
                          EFI_MEMORY_XP,
                          EFI_MEMORY_XP
                          );
    ASSERT_EFI_ERROR (Status);
  }
 
  //
  // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  // for safety.
  //
  TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
 
  //
  // End of PEI phase signal
  //
  Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  ASSERT_EFI_ERROR (Status);
 
  //
  // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  //
  UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);
 
  //
  // Transfer the control to the entry point of DxeCore.
  //
  SwitchStack (
    (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
    HobList.Raw,
    NULL,
    TopOfStack
    );
}