TextOutputNull.c

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#include <Uefi.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/OcConsoleLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
 
STATIC
EFI_STATUS
EFIAPI
NullTextReset (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN BOOLEAN                          ExtendedVerification
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextOutputString (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN CHAR16                           *String
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextTestString (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN CHAR16                           *String
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextQueryMode (
  IN  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN  UINTN                            ModeNumber,
  OUT UINTN                            *Columns,
  OUT UINTN                            *Rows
  )
{
  return EFI_UNSUPPORTED;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextSetMode (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN UINTN                            ModeNumber
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextSetAttribute (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN UINTN                            Attribute
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextClearScreen (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextSetCursorPosition (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN UINTN                            Column,
  IN UINTN                            Row
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_STATUS
EFIAPI
NullTextEnableCursor (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *This,
  IN BOOLEAN                          Visible
  )
{
  return EFI_SUCCESS;
}
 
STATIC
EFI_SIMPLE_TEXT_OUTPUT_MODE
  mNullTextOutputMode;
 
STATIC
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
  mNullTextOutputProtocol = {
  NullTextReset,
  NullTextOutputString,
  NullTextTestString,
  NullTextQueryMode,
  NullTextSetMode,
  NullTextSetAttribute,
  NullTextClearScreen,
  NullTextSetCursorPosition,
  NullTextEnableCursor,
  &mNullTextOutputMode
};
 
EFI_SYSTEM_TABLE *
AllocateNullTextOutSystemTable (
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_SYSTEM_TABLE  *NewSystemTable;
  EFI_STATUS        Status;
 
  //
  // Patch verbose
  //
  NewSystemTable = (EFI_SYSTEM_TABLE *)AllocateZeroPool (SystemTable->Hdr.HeaderSize);
 
  if (NewSystemTable == NULL) {
    return NULL;
  }
 
  CopyMem ((VOID *)NewSystemTable, SystemTable, SystemTable->Hdr.HeaderSize);
  NewSystemTable->ConOut    = &mNullTextOutputProtocol;
  NewSystemTable->Hdr.CRC32 = 0;
 
  Status = gBS->CalculateCrc32 (
                  NewSystemTable,
                  NewSystemTable->Hdr.HeaderSize,
                  &NewSystemTable->Hdr.CRC32
                  );
 
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_WARN, "OCC: Failed to calculated new system table CRC32 with Status: %r\n", Status));
    FreePool (NewSystemTable);
    return NULL;
  }
 
  return NewSystemTable;
}