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/** @file
SPCR table parser
Copyright (c) 2016 - 2024, Arm Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- Microsoft Serial Port Console Redirection Table
Specification - Version 1.03 - August 10, 2015.
**/
#include <IndustryStandard/Acpi.h>
#include <IndustryStandard/SerialPortConsoleRedirectionTable.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiTableParser.h"
// Local variables
STATIC ACPI_DESCRIPTION_HEADER_INFO AcpiHdrInfo;
STATIC UINT16 *NamespaceStringLength;
STATIC UINT16 *NamespaceStringOffset;
/**
This function validates the Interrupt Type.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Length Length of the field.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateInterruptType (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
#if defined (MDE_CPU_AARCH64)
UINT8 InterruptType;
InterruptType = *Ptr;
if (InterruptType !=
EFI_ACPI_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_INTERRUPT_TYPE_GIC)
{
IncrementErrorCount ();
Print (
L"\nERROR: InterruptType = %d. This must be 8 on ARM Platforms",
InterruptType
);
}
#endif
}
/**
This function validates the Irq.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Length Length of the field.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateIrq (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
#if defined (MDE_CPU_AARCH64)
UINT8 Irq;
Irq = *Ptr;
if (Irq != 0) {
IncrementErrorCount ();
Print (
L"\nERROR: Irq = %d. This must be zero on ARM Platforms\n",
Irq
);
}
#endif
}
/**
This function validates the NameSpace string length.
@param [in] Ptr Pointer to the start of the buffer.
@param [in] Length Length of the field.
@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 UINT32 Length,
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 SPCR Table.
**/
STATIC CONST ACPI_PARSER SpcrParser[] = {
PARSE_ACPI_HEADER (&AcpiHdrInfo),
{ L"Interface Type", 1, 36, L"%d", NULL, NULL, NULL, NULL },
{ L"Reserved", 3, 37, L"%x %x %x", Dump3Chars, NULL, NULL, NULL },
{ L"Base Address", 12, 40, NULL, DumpGas, NULL, NULL, NULL },
{ L"Interrupt Type", 1, 52, L"%d", NULL, NULL, ValidateInterruptType, NULL },
{ L"IRQ", 1, 53, L"%d", NULL, NULL, ValidateIrq, NULL },
{ L"Global System Interrupt", 4, 54, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Baud Rate", 1, 58, L"%d", NULL, NULL, NULL, NULL },
{ L"Parity", 1, 59, L"%d", NULL, NULL, NULL, NULL },
{ L"Stop Bits", 1, 60, L"%d", NULL, NULL, NULL, NULL },
{ L"Flow Control", 1, 61, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Terminal Type", 1, 62, L"%d", NULL, NULL, NULL, NULL },
{ L"Reserved", 1, 63, L"%x", NULL, NULL, NULL, NULL },
{ L"PCI Device ID", 2, 64, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Vendor ID", 2, 66, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Bus Number", 1, 68, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Device Number", 1, 69, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Function Number", 1, 70, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Flags", 4, 71, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCI Segment", 1, 75, L"0x%x", NULL, NULL, NULL, NULL },
{ L"UART Clock Frequency", 4, 76, L"%d", NULL, NULL, NULL, NULL },
{ L"Precise Baud Rate", 4, 80, L"%d", NULL, NULL, NULL, NULL },
{ L"Namespace String Length", 2, 84, L"%x", NULL, (VOID **)&NamespaceStringLength, ValidateNameSpaceStrLen, NULL },
{ L"Namespace String Offset", 2, 86, L"%x", NULL, (VOID **)&NamespaceStringOffset, NULL, NULL }
};
/**
This function parses the ACPI SPCR table.
When trace is enabled this function parses the SPCR table and
traces the ACPI table fields.
This function also performs validations 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
ParseAcpiSpcr (
IN BOOLEAN Trace,
IN UINT8 *Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
UINT16 Index;
UINT16 Offset;
if (!Trace) {
return;
}
// Dump the SPCR
ParseAcpi (
TRUE,
0,
"SPCR",
Ptr,
AcpiTableLength,
PARSER_PARAMS (SpcrParser)
);
if (*AcpiHdrInfo.Revision >= EFI_ACPI_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_REVISION_4) {
if ((*NamespaceStringOffset >= AcpiTableLength) ||
((UINT32)(*NamespaceStringOffset + *NamespaceStringLength) > AcpiTableLength))
{
IncrementErrorCount ();
Print (
L"ERROR: Invalid Namespace String. AcpiTableLength = %d, NamespaceStringOffset = %d, NamespaceStringLength = %d\n",
AcpiTableLength,
*NamespaceStringOffset,
*NamespaceStringLength
);
return;
}
Index = 0;
Offset = *NamespaceStringOffset;
PrintFieldName (4, L"Namespace String");
while ((Index++ < *NamespaceStringLength) &&
((UINT32)Offset < AcpiTableLength))
{
Print (L"%c", *(Ptr + Offset));
Offset++;
}
}
}
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