OvmfPkg/Sec/SecMain.c

   1 /** @file
   2   Main SEC phase code.  Transitions to PEI.
   3
   4   Copyright (c) 2008 - 2009, Intel Corporation
   5
   6   All rights reserved. This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <PiPei.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/DebugLib.h>
  19 #include <Library/BaseMemoryLib.h>
  20 #include <Library/PeiServicesLib.h>
  21 #include <Ppi/TemporaryRamSupport.h>
  22 #include <Library/PcdLib.h>
  23
  24 #include "SecMain.h"
  25
  26 EFI_STATUS
  27 EFIAPI
  28 TemporaryRamMigration (
  29   IN CONST EFI_PEI_SERVICES   **PeiServices,
  30   IN EFI_PHYSICAL_ADDRESS     TemporaryMemoryBase,
  31   IN EFI_PHYSICAL_ADDRESS     PermanentMemoryBase,
  32   IN UINTN                    CopySize
  33   );
  34
  35 STATIC TEMPORARY_RAM_SUPPORT_PPI mTempRamSupportPpi = {
  36   (TEMPORARY_RAM_MIGRATION) TemporaryRamMigration
  37 };
  38
  39 STATIC EFI_PEI_PPI_DESCRIPTOR mPrivateDispatchTable[] = {
  40   {
  41     (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  42     &gEfiTemporaryRamSupportPpiGuid,
  43     &mTempRamSupportPpi
  44   },
  45 };
  46
  47
  48 VOID
  49 InitializeIdtPtr (
  50   IN VOID* IdtPtr
  51   )
  52 {
  53   IA32_DESCRIPTOR             IdtDescriptor;
  54
  55   IdtDescriptor.Base  = (UINTN)IdtPtr;
  56   IdtDescriptor.Limit = (UINT16) 0;
  57   AsmWriteIdtr (&IdtDescriptor);
  58 }
  59
  60 VOID
  61 EFIAPI
  62 SecCoreStartupWithStack (
  63   IN VOID       *BootFirmwareVolumePtr,
  64   IN VOID       *SecCoreEntryPoint,
  65   IN VOID       *PeiCoreEntryPoint,
  66   IN VOID       *TopOfCurrentStack
  67   )
  68 {
  69   EFI_SEC_PEI_HAND_OFF        *SecCoreData;
  70   UINT8                       *BottomOfTempRam;
  71   UINT8                       *TopOfTempRam;
  72   UINTN                       SizeOfTempRam;
  73   VOID                        *IdtPtr;
  74
  75   DEBUG ((EFI_D_ERROR,
  76     "SecCoreStartupWithStack(0x%x, 0x%x, 0x%x, 0x%x)\n",
  77     (UINT32)(UINTN)BootFirmwareVolumePtr,
  78     (UINT32)(UINTN)SecCoreEntryPoint,
  79     (UINT32)(UINTN)PeiCoreEntryPoint,
  80     (UINT32)(UINTN)TopOfCurrentStack));
  81
  82
  83   BottomOfTempRam = (UINT8*)(UINTN) INITIAL_TOP_OF_STACK;
  84   SizeOfTempRam = (UINTN) SIZE_64KB;
  85   TopOfTempRam = BottomOfTempRam + SizeOfTempRam;
  86
  87   //
  88   // |-------------|
  89   // | SecCoreData | 4k
  90   // |-------------|
  91   // |    Heap     | 28k
  92   // |-------------|
  93   // |   Stack     | 32k
  94   // |-------------| <---- INITIAL_TOP_OF_STACK
  95   //
  96
  97   //
  98   // Bind this information into the SEC hand-off state
  99   //
 100   SecCoreData = (EFI_SEC_PEI_HAND_OFF*)((UINTN) TopOfTempRam - SIZE_4KB);
 101   SecCoreData->DataSize = sizeof(EFI_SEC_PEI_HAND_OFF);
 102
 103   SecCoreData->BootFirmwareVolumeBase = (VOID*)(UINTN) PcdGet32 (PcdOvmfFlashFvRecoveryBase);
 104   SecCoreData->BootFirmwareVolumeSize = PcdGet32 (PcdOvmfFlashFvRecoverySize);
 105
 106   SecCoreData->TemporaryRamBase       = (VOID*) BottomOfTempRam;
 107   SecCoreData->TemporaryRamSize       = SizeOfTempRam;
 108
 109   SecCoreData->PeiTemporaryRamSize    = 28 * SIZE_1KB;
 110   SecCoreData->PeiTemporaryRamBase    = (VOID*)((UINTN)SecCoreData - SecCoreData->PeiTemporaryRamSize);
 111
 112   SecCoreData->StackBase              = SecCoreData->TemporaryRamBase;
 113   SecCoreData->StackSize              = (UINTN)SecCoreData->PeiTemporaryRamBase - (UINTN)SecCoreData->TemporaryRamBase;
 114
 115   //
 116   // Initialize the IDT Pointer, since IA32 & X64 architectures
 117   // use it to store the PEI Services pointer.
 118   //
 119   IdtPtr = (VOID*)((UINT8*)SecCoreData + sizeof (*SecCoreData) + sizeof (UINTN));
 120   IdtPtr = ALIGN_POINTER(IdtPtr, 16);
 121   InitializeIdtPtr (IdtPtr);
 122
 123   //
 124   // Transfer control to the PEI Core
 125   //
 126   PeiSwitchStacks (
 127     (SWITCH_STACK_ENTRY_POINT) (UINTN) PeiCoreEntryPoint,
 128     SecCoreData,
 129     (VOID *) (UINTN) ((EFI_PEI_PPI_DESCRIPTOR *) &mPrivateDispatchTable),
 130     NULL,
 131     TopOfCurrentStack,
 132     (VOID *)((UINTN)SecCoreData->StackBase + SecCoreData->StackSize)
 133     );
 134
 135   //
 136   // If we get here, then the PEI Core returned.  This is an error
 137   //
 138   ASSERT (FALSE);
 139   CpuDeadLoop ();
 140 }
 141
 142 EFI_STATUS
 143 EFIAPI
 144 TemporaryRamMigration (
 145   IN CONST EFI_PEI_SERVICES   **PeiServices,
 146   IN EFI_PHYSICAL_ADDRESS     TemporaryMemoryBase,
 147   IN EFI_PHYSICAL_ADDRESS     PermanentMemoryBase,
 148   IN UINTN                    CopySize
 149   )
 150 {
 151   DEBUG ((EFI_D_ERROR, "TemporaryRamMigration(0x%x, 0x%x, 0x%x)\n", (UINTN)TemporaryMemoryBase, (UINTN)PermanentMemoryBase, CopySize));
 152
 153   //
 154   // Migrate the whole temporary memory to permenent memory.
 155   //
 156   CopyMem((VOID*)(UINTN)PermanentMemoryBase, (VOID*)(UINTN)TemporaryMemoryBase, CopySize);
 157
 158   //
 159   // SecSwitchStack function must be invoked after the memory migration
 160   // immediatly, also we need fixup the stack change caused by new call into
 161   // permenent memory.
 162   //
 163   SecSwitchStack (
 164     (UINTN) TemporaryMemoryBase,
 165     (UINTN) PermanentMemoryBase,
 166     CopySize
 167     );
 168
 169   return EFI_SUCCESS;
 170 }
 171