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/** @file
AML Resource Data.
Copyright (c) 2019 - 2020, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Glossary:
- Rd or RD - Resource Data
- Rds or RDS - Resource Data Small
- Rdl or RDL - Resource Data Large
**/
#include <ResourceData/AmlResourceData.h>
/** Check whether the resource data has the input descriptor Id.
The small/large bit is included in the descriptor Id,
but the size bits are not included for small resource data elements.
@param [in] Header Pointer to the first byte of a resource data
element.
@param [in] DescriptorId The descriptor to check against.
@retval TRUE The resource data has the descriptor Id.
@retval FALSE Otherwise.
**/
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);
}
}
/** Get the descriptor Id of the resource data.
The small/large bit is included in the descriptor Id,
but the size bits are not included for small resource data elements.
@param [in] Header Pointer to the first byte of a resource data.
@return A descriptor Id.
**/
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;
}
/** Get the size of a resource data element.
If the resource data element is of the large type, the Header
is expected to be at least 3 bytes long.
@param [in] Header Pointer to the first byte of a resource data.
@return The size of the resource data element.
**/
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);
}
/** Set the Checksum of an EndTag resource data.
ACPI 6.4, s6.4.2.9 "End Tag":
"This checksum is generated such that adding it to the sum of all the data
bytes will produce a zero sum."
"If the checksum field is zero, the resource data is treated as if the
checksum operation succeeded. Configuration proceeds normally."
@param [in] Header Pointer to the first byte of a resource data.
@param [in] CheckSum Checksum value to set.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
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;
}
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