ACPI_STATUS
AcpiOsGetTableByName (
char *Signature,
UINT32 Instance,
ACPI_TABLE_HEADER **Table,
ACPI_PHYSICAL_ADDRESS *Address)
{
HKEY Handle = NULL;
LONG WinStatus;
ULONG Type;
ULONG NameSize;
ULONG DataSize;
HKEY SubKey;
ULONG i;
ACPI_TABLE_HEADER *ReturnTable;
ACPI_STATUS Status = AE_OK;
/*
* Windows has no SSDTs in the registry, so multiple instances are
* not supported.
*/
if (Instance > 0)
{
return (AE_LIMIT);
}
/* Get a handle to the table key */
while (1)
{
ACPI_STRCPY (KeyBuffer, "HARDWARE\\ACPI\\");
if (AcpiUtSafeStrcat (KeyBuffer, sizeof (KeyBuffer), Signature))
{
return (AE_BUFFER_OVERFLOW);
}
WinStatus = RegOpenKeyEx (HKEY_LOCAL_MACHINE, KeyBuffer,
0L, KEY_READ, &Handle);
if (WinStatus != ERROR_SUCCESS)
{
/*
* Somewhere along the way, MS changed the registry entry for
* the FADT from
* HARDWARE/ACPI/FACP to
* HARDWARE/ACPI/FADT.
*
* This code allows for both.
*/
if (ACPI_COMPARE_NAME (Signature, "FACP"))
{
Signature = "FADT";
}
else if (ACPI_COMPARE_NAME (Signature, "XSDT"))
{
Signature = "RSDT";
}
else
{
fprintf (stderr,
"Could not find %s in registry at %s: %s (WinStatus=0x%X)\n",
Signature, KeyBuffer, WindowsFormatException (WinStatus), WinStatus);
return (AE_NOT_FOUND);
}
}
else
{
break;
}
}
/* Actual data for the table is down a couple levels */
for (i = 0; ;)
{
WinStatus = RegEnumKey (Handle, i, KeyBuffer, sizeof (KeyBuffer));
i++;
if (WinStatus == ERROR_NO_MORE_ITEMS)
{
break;
}
WinStatus = RegOpenKey (Handle, KeyBuffer, &SubKey);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not open %s entry: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
RegCloseKey (Handle);
Handle = SubKey;
i = 0;
}
/* Find the (binary) table entry */
for (i = 0; ; i++)
{
NameSize = sizeof (KeyBuffer);
WinStatus = RegEnumValue (Handle, i, KeyBuffer, &NameSize, NULL,
&Type, NULL, 0);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not get %s registry entry: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
if (Type == REG_BINARY)
{
break;
}
}
/* Get the size of the table */
WinStatus = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL,
NULL, &DataSize);
if (WinStatus = ERROR_SUCCESS)
{
fprintf (stderr, "Could not read the %s table size: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
/* Allocate a new buffer for the table */
ReturnTable = malloc (DataSize);
if (!ReturnTable)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
/* Get the actual table from the registry */
WinStatus = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL,
(UCHAR *) ReturnTable, &DataSize);
if (WinStatus = ERROR_SUCCESS)
{
fprintf (stderr, "Could not read %s data: %s\n",
Signature, WindowsFormatException (WinStatus));
free (ReturnTable);
Status = AE_ERROR;
goto Cleanup;
}
*Table = ReturnTable;
*Address = 0;
Cleanup:
RegCloseKey (Handle);
return (Status);
}
ACPI_STATUS
AcpiOsGetTableByName (
char *Signature,
UINT32 Instance,
ACPI_TABLE_HEADER **Table,
ACPI_PHYSICAL_ADDRESS *Address)
{
HKEY Handle = NULL;
LONG WinStatus;
ULONG Type;
ULONG NameSize;
ULONG DataSize;
HKEY SubKey;
ULONG i;
ACPI_TABLE_HEADER *ReturnTable;
ACPI_STATUS Status = AE_OK;
/* Multiple instances are only supported for SSDT tables. */
if (Instance > 0 && !ACPI_COMPARE_NAME (Signature, ACPI_SIG_SSDT))
{
return (AE_LIMIT);
}
/* Get a handle to the table key */
while (1)
{
strcpy (KeyBuffer, "HARDWARE\\ACPI\\");
if (AcpiUtSafeStrcat (KeyBuffer, sizeof (KeyBuffer), Signature))
{
return (AE_BUFFER_OVERFLOW);
}
/*
* Windows stores SSDT at SSDT, SSD1, ..., SSD9, SSDA, ..., SSDS, SSDT,
* SSDU, ..., SSDY. If the first (0th) and the 29th tables have the same
* OEM ID, Table ID and Revision, then the 29th entry will overwrite the
* first entry... Let's hope that we do not have that many entries.
*/
if (Instance > 0 && ACPI_COMPARE_NAME (Signature, ACPI_SIG_SSDT))
{
if (Instance < 10)
{
KeyBuffer[strlen (KeyBuffer) - 1] = '0' + (char) Instance;
}
else if (Instance < 29)
{
KeyBuffer[strlen (KeyBuffer) - 1] = 'A' + (char) (Instance - 10);
}
else
{
return (AE_LIMIT);
}
}
WinStatus = RegOpenKeyEx (HKEY_LOCAL_MACHINE, KeyBuffer,
0L, KEY_READ, &Handle);
if (WinStatus != ERROR_SUCCESS)
{
/*
* Somewhere along the way, MS changed the registry entry for
* the FADT from
* HARDWARE/ACPI/FACP to
* HARDWARE/ACPI/FADT.
*
* This code allows for both.
*/
if (ACPI_COMPARE_NAME (Signature, "FACP"))
{
Signature = "FADT";
}
else if (ACPI_COMPARE_NAME (Signature, "XSDT"))
{
Signature = "RSDT";
}
else if (ACPI_COMPARE_NAME (Signature, ACPI_SIG_SSDT))
{
/* SSDT may not be present on older Windows versions, but it is
* also possible that the index is not found. */
return (AE_NOT_FOUND);
}
else
{
fprintf (stderr,
"Could not find %s in registry at %s: %s (WinStatus=0x%X)\n",
Signature, KeyBuffer, WindowsFormatException (WinStatus), WinStatus);
return (AE_NOT_FOUND);
}
}
else
{
break;
}
}
/* Actual data for the table is down a couple levels */
for (i = 0; ;)
{
WinStatus = RegEnumKey (Handle, i, KeyBuffer, sizeof (KeyBuffer));
i++;
if (WinStatus == ERROR_NO_MORE_ITEMS)
{
break;
}
WinStatus = RegOpenKey (Handle, KeyBuffer, &SubKey);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not open %s entry: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
RegCloseKey (Handle);
Handle = SubKey;
i = 0;
}
/* Find the (binary) table entry */
for (i = 0; ; i++)
{
NameSize = sizeof (KeyBuffer);
WinStatus = RegEnumValue (Handle, i, KeyBuffer, &NameSize, NULL,
&Type, NULL, 0);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not get %s registry entry: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
if (Type == REG_BINARY)
{
break;
}
}
/* Get the size of the table */
WinStatus = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL,
NULL, &DataSize);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not read the %s table size: %s\n",
Signature, WindowsFormatException (WinStatus));
Status = AE_ERROR;
goto Cleanup;
}
/* Allocate a new buffer for the table */
ReturnTable = malloc (DataSize);
if (!ReturnTable)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
/* Get the actual table from the registry */
WinStatus = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL,
(UCHAR *) ReturnTable, &DataSize);
if (WinStatus != ERROR_SUCCESS)
{
fprintf (stderr, "Could not read %s data: %s\n",
Signature, WindowsFormatException (WinStatus));
free (ReturnTable);
Status = AE_ERROR;
goto Cleanup;
}
*Table = ReturnTable;
*Address = 0;
Cleanup:
RegCloseKey (Handle);
return (Status);
}
