Allocate memory in DebugSupport beforehand, in order to avoid calling memory allocati...

[mirror_edk2.git] / EdkModulePkg / Universal / DebugSupport / Dxe / Ia32 / plDebugSupport.c

/**@file\r
  IA32 specific debug support functions\r
\r
Copyright (c) 2006 - 2007, Intel Corporation\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
//\r
// private header files\r
//\r
#include "plDebugSupport.h"\r
\r
//\r
// This the global main table to keep track of the interrupts\r
//\r
IDT_ENTRY   *IdtEntryTable  = NULL;\r
DESCRIPTOR  NullDesc        = 0;\r
\r
STATIC\r
EFI_STATUS\r
CreateEntryStub (\r
  IN EFI_EXCEPTION_TYPE     ExceptionType,\r
  OUT VOID                  **Stub\r
  )\r
/*++\r
\r
Routine Description: Allocate pool for a new IDT entry stub.  Copy the generic\r
    stub into the new buffer and fixup the vector number and jump target address.\r
\r
Arguments:\r
    ExceptionType - This is the exception type that the new stub will be created\r
                    for.\r
    Stub - On successful exit, *Stub contains the newly allocated entry stub.\r
Returns:\r
  Typically EFI_SUCCESS\r
  other possibilities are passed through from AllocatePool\r
\r
--*/\r
{\r
  UINT8       *StubCopy;\r
\r
  StubCopy = *Stub;\r
\r
  //\r
  // Fixup the stub code for this vector\r
  //\r
\r
  // The stub code looks like this:\r
  //\r
  //    00000000  89 25 00000004 R  mov     AppEsp, esp             ; save stack top\r
  //    00000006  BC 00008014 R     mov     esp, offset DbgStkBot   ; switch to debugger stack\r
  //    0000000B  6A 00             push    0                       ; push vector number - will be modified before installed\r
  //    0000000D  E9                db      0e9h                    ; jump rel32\r
  //    0000000E  00000000          dd      0                       ; fixed up to relative address of CommonIdtEntry\r
  //\r
\r
  //\r
  // poke in the exception type so the second push pushes the exception type\r
  //\r
  StubCopy[0x0c] = (UINT8) ExceptionType;\r
\r
  //\r
  // fixup the jump target to point to the common entry\r
  //\r
  *(UINT32 *) &StubCopy[0x0e] = (UINT32) CommonIdtEntry - (UINT32) &StubCopy[StubSize];\r
\r
  return EFI_SUCCESS;\r
}\r
\r
STATIC\r
EFI_STATUS\r
HookEntry (\r
  IN EFI_EXCEPTION_TYPE            ExceptionType,\r
  IN VOID                         (*NewCallback) ()\r
  )\r
/*++\r
\r
Routine Description:\r
  Creates a nes entry stub.  Then saves the current IDT entry and replaces it\r
  with an interrupt gate for the new entry point.  The IdtEntryTable is updated\r
  with the new registered function.\r
\r
  This code executes in boot services context.  The stub entry executes in interrupt\r
  context.\r
\r
Arguments:\r
  ExceptionType - specifies which vector to hook.\r
  NewCallback - a pointer to the new function to be registered.\r
\r
Returns:\r
  EFI_SUCCESS\r
  Other possibilities are passed through by CreateEntryStub\r
\r
--*/\r
{\r
  BOOLEAN     OldIntFlagState;\r
  EFI_STATUS  Status;\r
\r
  Status = CreateEntryStub (ExceptionType, (VOID **) &IdtEntryTable[ExceptionType].StubEntry);\r
  if (Status == EFI_SUCCESS) {\r
    OldIntFlagState = WriteInterruptFlag (0);\r
    ReadIdt (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));\r
\r
    ((UINT16 *) &IdtEntryTable[ExceptionType].OrigVector)[0]  = ((UINT16 *) &IdtEntryTable[ExceptionType].OrigDesc)[0];\r
    ((UINT16 *) &IdtEntryTable[ExceptionType].OrigVector)[1]  = ((UINT16 *) &IdtEntryTable[ExceptionType].OrigDesc)[3];\r
\r
    Vect2Desc (&IdtEntryTable[ExceptionType].NewDesc, IdtEntryTable[ExceptionType].StubEntry);\r
    IdtEntryTable[ExceptionType].RegisteredCallback = NewCallback;\r
    WriteIdt (ExceptionType, &(IdtEntryTable[ExceptionType].NewDesc));\r
    WriteInterruptFlag (OldIntFlagState);\r
  }\r
\r
  return Status;\r
}\r
\r
STATIC\r
EFI_STATUS\r
UnhookEntry (\r
  IN EFI_EXCEPTION_TYPE           ExceptionType\r
  )\r
/*++\r
\r
Routine Description:\r
  Undoes HookEntry. This code executes in boot services context.\r
\r
Arguments:\r
  ExceptionType - specifies which entry to unhook\r
\r
Returns:\r
  EFI_SUCCESS\r
\r
--*/\r
{\r
  BOOLEAN     OldIntFlagState;\r
\r
  OldIntFlagState = WriteInterruptFlag (0);\r
  WriteIdt (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));\r
  WriteInterruptFlag (OldIntFlagState);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
EFI_STATUS\r
ManageIdtEntryTable (\r
  VOID (*NewCallback)(),\r
  EFI_EXCEPTION_TYPE ExceptionType\r
  )\r
/*++\r
\r
Routine Description:\r
  This is the main worker function that manages the state of the interrupt\r
  handlers.  It both installs and uninstalls interrupt handlers based on the\r
  value of NewCallback.  If NewCallback is NULL, then uninstall is indicated.\r
  If NewCallback is non-NULL, then install is indicated.\r
\r
Arguments:\r
  NewCallback - If non-NULL, NewCallback specifies the new handler to register.\r
                If NULL, specifies that the previously registered handler should\r
                    be uninstalled.\r
  ExceptionType - Indicates which entry to manage\r
\r
Returns:\r
  EFI_SUCCESS\r
  EFI_INVALID_PARAMETER - requested uninstalling a handler from a vector that has\r
                          no handler registered for it\r
  EFI_ALREADY_STARTED   - requested install to a vector that already has a handler registered.\r
\r
  Other possible return values are passed through from UnHookEntry and HookEntry.\r
\r
--*/\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = EFI_SUCCESS;\r
\r
  if (FeaturePcdGet (PcdNtEmulatorEnable)) {\r
    if (CompareDescriptor (&IdtEntryTable[ExceptionType].NewDesc, &NullDesc)) {\r
      //\r
      // we've already installed to this vector\r
      //\r
      if (NewCallback != NULL) {\r
        //\r
        // if the input handler is non-null, error\r
        //\r
        Status = EFI_ALREADY_STARTED;\r
      } else {\r
        Status = UnhookEntry (ExceptionType);\r
      }\r
    } else {\r
      //\r
      // no user handler installed on this vector\r
      //\r
      if (NewCallback == NULL) {\r
        //\r
        // if the input handler is null, error\r
        //\r
        Status = EFI_INVALID_PARAMETER;\r
      } else {\r
        Status = HookEntry (ExceptionType, NewCallback);\r
      }\r
    }\r
  }\r
\r
  return Status;\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
GetMaximumProcessorIndex (\r
  IN EFI_DEBUG_SUPPORT_PROTOCOL       *This,\r
  OUT UINTN                           *MaxProcessorIndex\r
  )\r
/*++\r
\r
Routine Description: This is a DebugSupport protocol member function.\r
\r
Arguments:\r
  This              - The DebugSupport instance\r
  MaxProcessorIndex - The maximuim supported processor index\r
\r
Returns:\r
  Always returns EFI_SUCCESS with *MaxProcessorIndex set to 0\r
\r
--*/\r
{\r
  *MaxProcessorIndex = 0;\r
  return (EFI_SUCCESS);\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
RegisterPeriodicCallback (\r
  IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r
  IN UINTN                      ProcessorIndex,\r
  IN EFI_PERIODIC_CALLBACK      PeriodicCallback\r
  )\r
/*++\r
\r
Routine Description: This is a DebugSupport protocol member function.\r
\r
Arguments:\r
  This             - The DebugSupport instance\r
  ProcessorIndex   - Which processor the callback applies to.\r
  PeriodicCallback - Callback function\r
\r
Returns:\r
\r
  EFI_SUCCESS\r
  EFI_INVALID_PARAMETER - requested uninstalling a handler from a vector that has\r
                          no handler registered for it\r
  EFI_ALREADY_STARTED   - requested install to a vector that already has a handler registered.\r
\r
  Other possible return values are passed through from UnHookEntry and HookEntry.\r
\r
--*/\r
{\r
  return ManageIdtEntryTable (PeriodicCallback, SYSTEM_TIMER_VECTOR);\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
RegisterExceptionCallback (\r
  IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r
  IN UINTN                      ProcessorIndex,\r
  IN EFI_EXCEPTION_CALLBACK     NewCallback,\r
  IN EFI_EXCEPTION_TYPE         ExceptionType\r
  )\r
/*++\r
\r
Routine Description:\r
  This is a DebugSupport protocol member function.\r
\r
  This code executes in boot services context.\r
\r
Arguments:\r
  This             - The DebugSupport instance\r
  ProcessorIndex   - Which processor the callback applies to.\r
  NewCallback      - Callback function\r
  ExceptionType    - Which exception to hook\r
\r
Returns:\r
\r
  EFI_SUCCESS\r
  EFI_INVALID_PARAMETER - requested uninstalling a handler from a vector that has\r
                          no handler registered for it\r
  EFI_ALREADY_STARTED   - requested install to a vector that already has a handler registered.\r
\r
  Other possible return values are passed through from UnHookEntry and HookEntry.\r
\r
--*/\r
{\r
  return ManageIdtEntryTable (NewCallback, ExceptionType);\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
InvalidateInstructionCache (\r
  IN EFI_DEBUG_SUPPORT_PROTOCOL       *This,\r
  IN UINTN                            ProcessorIndex,\r
  IN VOID                             *Start,\r
  IN UINT64                           Length\r
  )\r
/*++\r
\r
Routine Description:\r
  This is a DebugSupport protocol member function.\r
  Calls assembly routine to flush cache.\r
\r
Arguments:\r
  This             - The DebugSupport instance\r
  ProcessorIndex   - Which processor the callback applies to.\r
  Start            - Physical base of the memory range to be invalidated\r
  Length           - mininum number of bytes in instruction cache to invalidate\r
\r
Returns:\r
\r
  EFI_SUCCESS - always return success\r
\r
--*/\r
{\r
  AsmWbinvd ();\r
  return EFI_SUCCESS;\r
}\r
\r
EFI_STATUS\r
plInitializeDebugSupportDriver (\r
  VOID\r
  )\r
/*++\r
\r
Routine Description:\r
  Initializes driver's handler registration database.\r
\r
  This code executes in boot services context.\r
\r
Arguments:\r
  None\r
\r
Returns:\r
  EFI_SUCCESS\r
  EFI_UNSUPPORTED - if IA32 processor does not support FXSTOR/FXRSTOR instructions,\r
                    the context save will fail, so these processor's are not supported.\r
  EFI_OUT_OF_RESOURCES - not resource to finish initialization\r
\r
--*/\r
{\r
  EFI_EXCEPTION_TYPE  ExceptionType;\r
\r
  if (!FxStorSupport ()) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  IdtEntryTable = AllocateZeroPool (sizeof (IDT_ENTRY) * NUM_IDT_ENTRIES);\r
  if (IdtEntryTable == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {\r
    IdtEntryTable[ExceptionType].StubEntry = (DEBUG_PROC) (UINTN) AllocatePool (StubSize);\r
    if (IdtEntryTable[ExceptionType].StubEntry == NULL) {\r
      goto ErrorCleanup;\r
    }\r
\r
    CopyMem ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry, InterruptEntryStub, StubSize);\r
  }\r
  return EFI_SUCCESS;\r
\r
ErrorCleanup:\r
\r
  for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {\r
    if (IdtEntryTable[ExceptionType].StubEntry != NULL) {\r
      FreePool ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);\r
    }\r
  }\r
  FreePool (IdtEntryTable);\r
\r
  return EFI_OUT_OF_RESOURCES;\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
plUnloadDebugSupportDriver (\r
  IN EFI_HANDLE ImageHandle\r
  )\r
/*++\r
\r
Routine Description:\r
  This is the callback that is written to the LoadedImage protocol instance\r
  on the image handle. It uninstalls all registered handlers and frees all entry\r
  stub memory.\r
\r
  This code executes in boot services context.\r
\r
Arguments:\r
  ImageHandle - The image handle of the unload handler\r
\r
Returns:\r
\r
  EFI_SUCCESS - always return success\r
\r
--*/\r
{\r
  EFI_EXCEPTION_TYPE  ExceptionType;\r
\r
  for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {\r
    ManageIdtEntryTable (NULL, ExceptionType);\r
  }\r
\r
  FreePool (IdtEntryTable);\r
  return EFI_SUCCESS;\r
}\r
\r
VOID\r
InterruptDistrubutionHub (\r
  EFI_EXCEPTION_TYPE      ExceptionType,\r
  EFI_SYSTEM_CONTEXT_IA32 *ContextRecord\r
  )\r
/*++\r
\r
Routine Description: Common piece of code that invokes the registered handlers.\r
\r
  This code executes in exception context so no efi calls are allowed.\r
\r
Arguments:\r
  ExceptionType - exception type\r
  ContextRecord - system context\r
\r
Returns:\r
\r
  None\r
\r
--*/\r
{\r
  if (IdtEntryTable[ExceptionType].RegisteredCallback != NULL) {\r
    if (ExceptionType != SYSTEM_TIMER_VECTOR) {\r
      IdtEntryTable[ExceptionType].RegisteredCallback (ExceptionType, ContextRecord);\r
    } else {\r
      OrigVector = IdtEntryTable[ExceptionType].OrigVector;\r
      IdtEntryTable[ExceptionType].RegisteredCallback (ContextRecord);\r
    }\r
  }\r
}\r