LegacyRegion2.c

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#include <LegacyRegion2.h>
 
EFI_HANDLE  mLegacyRegion2Handle = NULL;
 
EFI_LEGACY_REGION2_PROTOCOL  mLegacyRegion2 = {
  LegacyRegion2Decode,
  LegacyRegion2Lock,
  LegacyRegion2BootLock,
  LegacyRegion2Unlock,
  LegacyRegionGetInfo
};
 
EFI_STATUS
EFIAPI
LegacyRegion2Decode (
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,
  IN  UINT32                       Start,
  IN  UINT32                       Length,
  OUT UINT32                       *Granularity,
  IN  BOOLEAN                      *On
  )
{
  if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
    return EFI_INVALID_PARAMETER;
  }
 
  ASSERT (Granularity != NULL);
  *Granularity = 0;
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
LegacyRegion2Lock (
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,
  IN  UINT32                       Start,
  IN  UINT32                       Length,
  OUT UINT32                       *Granularity
  )
{
  if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
    return EFI_INVALID_PARAMETER;
  }
 
  ASSERT (Granularity != NULL);
  *Granularity = 0;
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
LegacyRegion2BootLock (
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,
  IN  UINT32                       Start,
  IN  UINT32                       Length,
  OUT UINT32                       *Granularity
  )
{
  if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
    return EFI_INVALID_PARAMETER;
  }
 
  return EFI_UNSUPPORTED;
}
 
EFI_STATUS
EFIAPI
LegacyRegion2Unlock (
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,
  IN  UINT32                       Start,
  IN  UINT32                       Length,
  OUT UINT32                       *Granularity
  )
{
  if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
    return EFI_INVALID_PARAMETER;
  }
 
  ASSERT (Granularity != NULL);
  *Granularity = 0;
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
LegacyRegionGetInfo (
  IN  EFI_LEGACY_REGION2_PROTOCOL   *This,
  OUT UINT32                        *DescriptorCount,
  OUT EFI_LEGACY_REGION_DESCRIPTOR  **Descriptor
  )
{
  return EFI_UNSUPPORTED;
}
 
EFI_STATUS
EFIAPI
LegacyRegion2Install (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
 
  //
  // Make sure the Legacy Region 2 Protocol is not already installed in the system
  //
  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegion2ProtocolGuid);
 
  //
  // Install the protocol on a new handle.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &mLegacyRegion2Handle,
                  &gEfiLegacyRegion2ProtocolGuid,
                  &mLegacyRegion2,
                  NULL
                  );
  ASSERT_EFI_ERROR (Status);
 
  return EFI_SUCCESS;
}