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/** @file
DBG2 table parser
Copyright (c) 2016 - 2019, ARM Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- Microsoft Debug Port Table 2 (DBG2) Specification - December 10, 2015.
**/
#include <IndustryStandard/DebugPort2Table.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiTableParser.h"
// Local variables pointing to the table fields
STATIC CONST UINT32* OffsetDbgDeviceInfo;
STATIC CONST UINT32* NumberDbgDeviceInfo;
STATIC CONST UINT16* DbgDevInfoLen;
STATIC CONST UINT8* GasCount;
STATIC CONST UINT16* NameSpaceStringLength;
STATIC CONST UINT16* NameSpaceStringOffset;
STATIC CONST UINT16* OEMDataLength;
STATIC CONST UINT16* OEMDataOffset;
STATIC CONST UINT16* BaseAddrRegOffset;
STATIC CONST UINT16* AddrSizeOffset;
STATIC ACPI_DESCRIPTION_HEADER_INFO AcpiHdrInfo;
/**
This function validates the NameSpace string length.
@param [in] Ptr Pointer to the start of the buffer.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateNameSpaceStrLen (
IN UINT8* Ptr,
IN VOID* Context
)
{
UINT16 NameSpaceStrLen;
NameSpaceStrLen = *(UINT16*)Ptr;
if (NameSpaceStrLen < 2) {
IncrementErrorCount ();
Print (
L"\nERROR: NamespaceString Length = %d. If no Namespace device exists, " \
L"NamespaceString[] must contain a period '.'",
NameSpaceStrLen
);
}
}
/// An ACPI_PARSER array describing the ACPI DBG2 table.
STATIC CONST ACPI_PARSER Dbg2Parser[] = {
PARSE_ACPI_HEADER (&AcpiHdrInfo),
{L"OffsetDbgDeviceInfo", 4, 36, L"0x%x", NULL,
(VOID**)&OffsetDbgDeviceInfo, NULL, NULL},
{L"NumberDbgDeviceInfo", 4, 40, L"%d", NULL,
(VOID**)&NumberDbgDeviceInfo, NULL, NULL}
};
/// An ACPI_PARSER array describing the debug device information.
STATIC CONST ACPI_PARSER DbgDevInfoParser[] = {
{L"Revision", 1, 0, L"0x%x", NULL, NULL, NULL, NULL},
{L"Length", 2, 1, L"%d", NULL, (VOID**)&DbgDevInfoLen, NULL, NULL},
{L"Generic Address Registers Count", 1, 3, L"0x%x", NULL,
(VOID**)&GasCount, NULL, NULL},
{L"NameSpace String Length", 2, 4, L"%d", NULL,
(VOID**)&NameSpaceStringLength, ValidateNameSpaceStrLen, NULL},
{L"NameSpace String Offset", 2, 6, L"0x%x", NULL,
(VOID**)&NameSpaceStringOffset, NULL, NULL},
{L"OEM Data Length", 2, 8, L"%d", NULL, (VOID**)&OEMDataLength,
NULL, NULL},
{L"OEM Data Offset", 2, 10, L"0x%x", NULL, (VOID**)&OEMDataOffset,
NULL, NULL},
{L"Port Type", 2, 12, L"0x%x", NULL, NULL, NULL, NULL},
{L"Port SubType", 2, 14, L"0x%x", NULL, NULL, NULL, NULL},
{L"Reserved", 2, 16, L"%x", NULL, NULL, NULL, NULL},
{L"Base Address Register Offset", 2, 18, L"0x%x", NULL,
(VOID**)&BaseAddrRegOffset, NULL, NULL},
{L"Address Size Offset", 2, 20, L"0x%x", NULL,
(VOID**)&AddrSizeOffset, NULL, NULL}
};
/**
This function parses the debug device information structure.
@param [in] Ptr Pointer to the start of the buffer.
@param [out] Length Pointer in which the length of the debug
device information is returned.
**/
STATIC
VOID
EFIAPI
DumpDbgDeviceInfo (
IN UINT8* Ptr,
OUT UINT32* Length
)
{
UINT16 Index;
UINT8* DataPtr;
UINT32* AddrSize;
// Parse the debug device info to get the Length
ParseAcpi (
FALSE,
0,
"Debug Device Info",
Ptr,
3, // Length is 2 bytes starting at offset 1
PARSER_PARAMS (DbgDevInfoParser)
);
ParseAcpi (
TRUE,
2,
"Debug Device Info",
Ptr,
*DbgDevInfoLen,
PARSER_PARAMS (DbgDevInfoParser)
);
// GAS and Address Size
Index = 0;
DataPtr = Ptr + (*BaseAddrRegOffset);
AddrSize = (UINT32*)(Ptr + (*AddrSizeOffset));
while (Index < (*GasCount)) {
PrintFieldName (4, L"BaseAddressRegister");
DumpGasStruct (DataPtr, 4, GAS_LENGTH);
PrintFieldName (4, L"Address Size");
Print (L"0x%x\n", AddrSize[Index]);
DataPtr += GAS_LENGTH;
Index++;
}
// NameSpace String
Index = 0;
DataPtr = Ptr + (*NameSpaceStringOffset);
PrintFieldName (4, L"NameSpace String");
while (Index < (*NameSpaceStringLength)) {
Print (L"%c", DataPtr[Index++]);
}
Print (L"\n");
// OEM Data
Index = 0;
DataPtr = Ptr + (*OEMDataOffset);
PrintFieldName (4, L"OEM Data");
while (Index < (*OEMDataLength)) {
Print (L"%x ", DataPtr[Index++]);
if ((Index & 7) == 0) {
Print (L"\n%-*s ", OUTPUT_FIELD_COLUMN_WIDTH, L"");
}
}
Print (L"\n");
*Length = *DbgDevInfoLen;
}
/**
This function parses the ACPI DBG2 table.
When trace is enabled this function parses the DBG2 table and
traces the ACPI table fields.
This function also performs validation of the ACPI table fields.
@param [in] Trace If TRUE, trace the ACPI fields.
@param [in] Ptr Pointer to the start of the buffer.
@param [in] AcpiTableLength Length of the ACPI table.
@param [in] AcpiTableRevision Revision of the ACPI table.
**/
VOID
EFIAPI
ParseAcpiDbg2 (
IN BOOLEAN Trace,
IN UINT8* Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
UINT32 Offset;
UINT32 DbgDeviceInfoLength;
UINT8* DevInfoPtr;
if (!Trace) {
return;
}
Offset = ParseAcpi (
TRUE,
0,
"DBG2",
Ptr,
AcpiTableLength,
PARSER_PARAMS (Dbg2Parser)
);
DevInfoPtr = Ptr + Offset;
while (Offset < AcpiTableLength) {
DumpDbgDeviceInfo (
DevInfoPtr,
&DbgDeviceInfoLength
);
Offset += DbgDeviceInfoLength;
DevInfoPtr += DbgDeviceInfoLength;
}
}
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