AmlResourceData.c

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#include <ResourceData/AmlResourceData.h>
 
BOOLEAN
EFIAPI
AmlRdCompareDescId (
  IN  CONST AML_RD_HEADER  *Header,
  IN        AML_RD_HEADER  DescriptorId
  )
{
  if (Header == NULL) {
    ASSERT (0);
    return FALSE;
  }
 
  if (AML_RD_IS_LARGE (Header)) {
    return ((*Header ^ DescriptorId) == 0);
  } else {
    return (((*Header & AML_RD_SMALL_ID_MASK) ^ DescriptorId) == 0);
  }
}
 
AML_RD_HEADER
EFIAPI
AmlRdGetDescId (
  IN  CONST AML_RD_HEADER  *Header
  )
{
  if (Header == NULL) {
    ASSERT (0);
    return FALSE;
  }
 
  if (AML_RD_IS_LARGE (Header)) {
    return *Header;
  }
 
  // Header is a small resource data element.
  return *Header & AML_RD_SMALL_ID_MASK;
}
 
UINT32
EFIAPI
AmlRdGetSize (
  IN  CONST AML_RD_HEADER  *Header
  )
{
  if (Header == NULL) {
    ASSERT (0);
    return FALSE;
  }
 
  if (AML_RD_IS_LARGE (Header)) {
    return ((ACPI_LARGE_RESOURCE_HEADER *)Header)->Length +
           sizeof (ACPI_LARGE_RESOURCE_HEADER);
  }
 
  // Header is a small resource data element.
  return ((ACPI_SMALL_RESOURCE_HEADER *)Header)->Bits.Length +
         sizeof (ACPI_SMALL_RESOURCE_HEADER);
}
 
EFI_STATUS
EFIAPI
AmlRdSetEndTagChecksum (
  IN  CONST AML_RD_HEADER  *Header,
  IN        UINT8          CheckSum
  )
{
  if ((Header == NULL)  ||
      !AmlRdCompareDescId (
         Header,
         AML_RD_BUILD_SMALL_DESC_ID (ACPI_SMALL_END_TAG_DESCRIPTOR_NAME)
         ))
  {
    ASSERT (0);
    return EFI_INVALID_PARAMETER;
  }
 
  ((EFI_ACPI_END_TAG_DESCRIPTOR *)Header)->Checksum = CheckSum;
  return EFI_SUCCESS;
}