MdeModulePkg/Core/DxeIplPeim/RiscV64/DxeLoadFunc.c

   1 /** @file
   2   RISC-V specific functionality for DxeLoad.
   3
   4   Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include "DxeIpl.h"
  11
  12 /**
  13    Transfers control to DxeCore.
  14
  15    This function performs a CPU architecture specific operations to execute
  16    the entry point of DxeCore with the parameters of HobList.
  17    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  18
  19    @param DxeCoreEntryPoint         The entry point of DxeCore.
  20    @param HobList                   The start of HobList passed to DxeCore.
  21
  22 **/
  23 VOID
  24 HandOffToDxeCore (
  25   IN EFI_PHYSICAL_ADDRESS  DxeCoreEntryPoint,
  26   IN EFI_PEI_HOB_POINTERS  HobList
  27   )
  28 {
  29   VOID        *BaseOfStack;
  30   VOID        *TopOfStack;
  31   EFI_STATUS  Status;
  32
  33   //
  34   //
  35   // Allocate 128KB for the Stack
  36   //
  37   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  38   if (BaseOfStack == NULL) {
  39     DEBUG ((DEBUG_ERROR, "%a: Can't allocate memory for stack.", __FUNCTION__));
  40     ASSERT (FALSE);
  41   }
  42
  43   //
  44   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  45   // for safety.
  46   //
  47   TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  48   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  49
  50   //
  51   // End of PEI phase signal
  52   //
  53   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  54   if (EFI_ERROR (Status)) {
  55     DEBUG ((DEBUG_ERROR, "%a: Fail to signal End of PEI event.", __FUNCTION__));
  56     ASSERT (FALSE);
  57   }
  58
  59   //
  60   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  61   //
  62   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);
  63
  64   DEBUG ((DEBUG_INFO, "DXE Core new stack at %x, stack pointer at %x\n", BaseOfStack, TopOfStack));
  65
  66   //
  67   // Transfer the control to the entry point of DxeCore.
  68   //
  69   SwitchStack (
  70     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  71     HobList.Raw,
  72     NULL,
  73     TopOfStack
  74     );
  75 }