IntelFsp2Pkg/FspSecCore/SecMain.c

   1 /** @file
   2
   3   Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>
   4   This program and the accompanying materials
   5   are licensed and made available under the terms and conditions of the BSD License
   6   which accompanies this distribution.  The full text of the license may be found at
   7   http://opensource.org/licenses/bsd-license.php.
   8
   9   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 **/
  13
  14 #include "SecMain.h"
  15 #include "SecFsp.h"
  16
  17 EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI gSecTemporaryRamSupportPpi = {
  18   SecTemporaryRamSupport
  19 };
  20
  21 EFI_PEI_PPI_DESCRIPTOR            mPeiSecPlatformInformationPpi[] = {
  22   {
  23     EFI_PEI_PPI_DESCRIPTOR_PPI,
  24     &gFspInApiModePpiGuid,
  25     NULL
  26   },
  27   {
  28     (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  29     &gEfiTemporaryRamSupportPpiGuid,
  30     &gSecTemporaryRamSupportPpi
  31   }
  32 };
  33
  34 //
  35 // These are IDT entries pointing to 08:FFFFFFE4h.
  36 //
  37 UINT64  mIdtEntryTemplate = 0xffff8e000008ffe4ULL;
  38
  39 /**
  40
  41   Entry point to the C language phase of SEC. After the SEC assembly
  42   code has initialized some temporary memory and set up the stack,
  43   the control is transferred to this function.
  44
  45
  46   @param[in] SizeOfRam          Size of the temporary memory available for use.
  47   @param[in] TempRamBase        Base address of temporary ram
  48   @param[in] BootFirmwareVolume Base address of the Boot Firmware Volume.
  49   @param[in] PeiCore            PeiCore entry point.
  50   @param[in] BootLoaderStack    BootLoader stack.
  51   @param[in] ApiIdx             the index of API.
  52
  53   @return This function never returns.
  54
  55 **/
  56 VOID
  57 EFIAPI
  58 SecStartup (
  59   IN UINT32                   SizeOfRam,
  60   IN UINT32                   TempRamBase,
  61   IN VOID                    *BootFirmwareVolume,
  62   IN PEI_CORE_ENTRY           PeiCore,
  63   IN UINT32                   BootLoaderStack,
  64   IN UINT32                   ApiIdx
  65   )
  66 {
  67   EFI_SEC_PEI_HAND_OFF        SecCoreData;
  68   IA32_DESCRIPTOR             IdtDescriptor;
  69   SEC_IDT_TABLE               IdtTableInStack;
  70   UINT32                      Index;
  71   FSP_GLOBAL_DATA             PeiFspData;
  72   UINT64                      ExceptionHandler;
  73
  74   //
  75   // Process all libraries constructor function linked to SecCore.
  76   //
  77   ProcessLibraryConstructorList ();
  78
  79   //
  80   // Initialize floating point operating environment
  81   // to be compliant with UEFI spec.
  82   //
  83   InitializeFloatingPointUnits ();
  84
  85
  86   // |-------------------|---->
  87   // |Idt Table          |
  88   // |-------------------|
  89   // |PeiService Pointer |    PeiStackSize
  90   // |-------------------|
  91   // |                   |
  92   // |      Stack        |
  93   // |-------------------|---->
  94   // |                   |
  95   // |                   |
  96   // |      Heap         |    PeiTemporayRamSize
  97   // |                   |
  98   // |                   |
  99   // |-------------------|---->  TempRamBase
 100   IdtTableInStack.PeiService  = NULL;
 101   ExceptionHandler = FspGetExceptionHandler(mIdtEntryTemplate);
 102   for (Index = 0; Index < SEC_IDT_ENTRY_COUNT; Index ++) {
 103     CopyMem ((VOID*)&IdtTableInStack.IdtTable[Index], (VOID*)&ExceptionHandler, sizeof (UINT64));
 104   }
 105
 106   IdtDescriptor.Base  = (UINTN) &IdtTableInStack.IdtTable;
 107   IdtDescriptor.Limit = (UINT16)(sizeof (IdtTableInStack.IdtTable) - 1);
 108
 109   AsmWriteIdtr (&IdtDescriptor);
 110
 111   //
 112   // Initialize the global FSP data region
 113   //
 114   FspGlobalDataInit (&PeiFspData, BootLoaderStack, (UINT8)ApiIdx);
 115
 116   //
 117   // Update the base address and length of Pei temporary memory
 118   //
 119   SecCoreData.DataSize               = sizeof (EFI_SEC_PEI_HAND_OFF);
 120   SecCoreData.BootFirmwareVolumeBase = BootFirmwareVolume;
 121   SecCoreData.BootFirmwareVolumeSize = (UINT32)((EFI_FIRMWARE_VOLUME_HEADER *)BootFirmwareVolume)->FvLength;
 122
 123   SecCoreData.TemporaryRamBase       = (VOID*)(UINTN) TempRamBase;
 124   SecCoreData.TemporaryRamSize       = SizeOfRam;
 125   SecCoreData.PeiTemporaryRamBase    = SecCoreData.TemporaryRamBase;
 126   SecCoreData.PeiTemporaryRamSize    = SecCoreData.TemporaryRamSize * PcdGet8 (PcdFspHeapSizePercentage) / 100;
 127   SecCoreData.StackBase              = (VOID*)(UINTN)((UINTN)SecCoreData.TemporaryRamBase + SecCoreData.PeiTemporaryRamSize);
 128   SecCoreData.StackSize              = SecCoreData.TemporaryRamSize - SecCoreData.PeiTemporaryRamSize;
 129
 130   DEBUG ((DEBUG_INFO, "Fsp BootFirmwareVolumeBase - 0x%x\n", SecCoreData.BootFirmwareVolumeBase));
 131   DEBUG ((DEBUG_INFO, "Fsp BootFirmwareVolumeSize - 0x%x\n", SecCoreData.BootFirmwareVolumeSize));
 132   DEBUG ((DEBUG_INFO, "Fsp TemporaryRamBase       - 0x%x\n", SecCoreData.TemporaryRamBase));
 133   DEBUG ((DEBUG_INFO, "Fsp TemporaryRamSize       - 0x%x\n", SecCoreData.TemporaryRamSize));
 134   DEBUG ((DEBUG_INFO, "Fsp PeiTemporaryRamBase    - 0x%x\n", SecCoreData.PeiTemporaryRamBase));
 135   DEBUG ((DEBUG_INFO, "Fsp PeiTemporaryRamSize    - 0x%x\n", SecCoreData.PeiTemporaryRamSize));
 136   DEBUG ((DEBUG_INFO, "Fsp StackBase              - 0x%x\n", SecCoreData.StackBase));
 137   DEBUG ((DEBUG_INFO, "Fsp StackSize              - 0x%x\n", SecCoreData.StackSize));
 138
 139   //
 140   // Call PeiCore Entry
 141   //
 142   PeiCore (&SecCoreData, mPeiSecPlatformInformationPpi);
 143
 144   //
 145   // Should never be here
 146   //
 147   CpuDeadLoop ();
 148 }
 149
 150 /**
 151   This service of the TEMPORARY_RAM_SUPPORT_PPI that migrates temporary RAM into
 152   permanent memory.
 153
 154   @param[in] PeiServices            Pointer to the PEI Services Table.
 155   @param[in] TemporaryMemoryBase    Source Address in temporary memory from which the SEC or PEIM will copy the
 156                                 Temporary RAM contents.
 157   @param[in] PermanentMemoryBase    Destination Address in permanent memory into which the SEC or PEIM will copy the
 158                                 Temporary RAM contents.
 159   @param[in] CopySize               Amount of memory to migrate from temporary to permanent memory.
 160
 161   @retval EFI_SUCCESS           The data was successfully returned.
 162   @retval EFI_INVALID_PARAMETER PermanentMemoryBase + CopySize > TemporaryMemoryBase when
 163                                 TemporaryMemoryBase > PermanentMemoryBase.
 164
 165 **/
 166 EFI_STATUS
 167 EFIAPI
 168 SecTemporaryRamSupport (
 169   IN CONST EFI_PEI_SERVICES   **PeiServices,
 170   IN EFI_PHYSICAL_ADDRESS     TemporaryMemoryBase,
 171   IN EFI_PHYSICAL_ADDRESS     PermanentMemoryBase,
 172   IN UINTN                    CopySize
 173   )
 174 {
 175   IA32_DESCRIPTOR   IdtDescriptor;
 176   VOID*             OldHeap;
 177   VOID*             NewHeap;
 178   VOID*             OldStack;
 179   VOID*             NewStack;
 180   UINTN             HeapSize;
 181   UINTN             StackSize;
 182
 183   HeapSize   = CopySize * PcdGet8 (PcdFspHeapSizePercentage) / 100 ;
 184   StackSize  = CopySize - HeapSize;
 185
 186   OldHeap = (VOID*)(UINTN)TemporaryMemoryBase;
 187   NewHeap = (VOID*)((UINTN)PermanentMemoryBase + StackSize);
 188
 189   OldStack = (VOID*)((UINTN)TemporaryMemoryBase + HeapSize);
 190   NewStack = (VOID*)(UINTN)PermanentMemoryBase;
 191
 192   //
 193   // Migrate Heap
 194   //
 195   CopyMem (NewHeap, OldHeap, HeapSize);
 196
 197   //
 198   // Migrate Stack
 199   //
 200   CopyMem (NewStack, OldStack, StackSize);
 201
 202
 203   //
 204   // We need *not* fix the return address because currently,
 205   // The PeiCore is executed in flash.
 206   //
 207
 208   //
 209   // Rebase IDT table in permanent memory
 210   //
 211   AsmReadIdtr (&IdtDescriptor);
 212   IdtDescriptor.Base = IdtDescriptor.Base - (UINTN)OldStack + (UINTN)NewStack;
 213
 214   AsmWriteIdtr (&IdtDescriptor);
 215
 216   //
 217   // Fixed the FSP data pointer
 218   //
 219   FspDataPointerFixUp ((UINTN)NewStack - (UINTN)OldStack);
 220
 221   //
 222   // SecSwitchStack function must be invoked after the memory migration
 223   // immediately, also we need fixup the stack change caused by new call into
 224   // permanent memory.
 225   //
 226   SecSwitchStack (
 227     (UINT32) (UINTN) OldStack,
 228     (UINT32) (UINTN) NewStack
 229     );
 230
 231   return EFI_SUCCESS;
 232 }