/******************************************************************************
*
* Module Name: hwvalid - I/O request validation
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __HWVALID_C__
#include "acpi.h"
#include "accommon.h"
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME ("hwvalid")
/* Local prototypes */
static ACPI_STATUS
AcpiHwValidateIoRequest (
ACPI_IO_ADDRESS Address,
UINT32 BitWidth);
/*
* Protected I/O ports. Some ports are always illegal, and some are
* conditionally illegal. This table must remain ordered by port address.
*
* The table is used to implement the Microsoft port access rules that
* first appeared in Windows XP. Some ports are always illegal, and some
* ports are only illegal if the BIOS calls _OSI with a WinXP string or
* later (meaning that the BIOS itelf is post-XP.)
*
* This provides ACPICA with the desired port protections and
* Microsoft compatibility.
*
* Description of port entries:
* DMA: DMA controller
* PIC0: Programmable Interrupt Controller (8259A)
* PIT1: System Timer 1
* PIT2: System Timer 2 failsafe
* RTC: Real-time clock
* CMOS: Extended CMOS
* DMA1: DMA 1 page registers
* DMA1L: DMA 1 Ch 0 low page
* DMA2: DMA 2 page registers
* DMA2L: DMA 2 low page refresh
* ARBC: Arbitration control
* SETUP: Reserved system board setup
* POS: POS channel select
* PIC1: Cascaded PIC
* IDMA: ISA DMA
* ELCR: PIC edge/level registers
* PCI: PCI configuration space
*/
static const ACPI_PORT_INFO AcpiProtectedPorts[] =
{
{"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
{"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
{"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
{"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
{"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
{"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
{"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
{"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
{"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
};
#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts)
/******************************************************************************
*
* FUNCTION: AcpiHwValidateIoRequest
*
* PARAMETERS: Address Address of I/O port/register
* BitWidth Number of bits (8,16,32)
*
* RETURN: Status
*
* DESCRIPTION: Validates an I/O request (address/length). Certain ports are
* always illegal and some ports are only illegal depending on
* the requests the BIOS AML code makes to the predefined
* _OSI method.
*
******************************************************************************/
static ACPI_STATUS
AcpiHwValidateIoRequest (
ACPI_IO_ADDRESS Address,
UINT32 BitWidth)
{
UINT32 i;
UINT32 ByteWidth;
ACPI_IO_ADDRESS LastAddress;
const ACPI_PORT_INFO *PortInfo;
ACPI_FUNCTION_TRACE (HwValidateIoRequest);
/* Supported widths are 8/16/32 */
if ((BitWidth != 8) &&
(BitWidth != 16) &&
(BitWidth != 32))
{
return (AE_BAD_PARAMETER);
}
PortInfo = AcpiProtectedPorts;
ByteWidth = ACPI_DIV_8 (BitWidth);
LastAddress = Address + ByteWidth - 1;
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),
ByteWidth));
/* Maximum 16-bit address in I/O space */
if (LastAddress > ACPI_UINT16_MAX)
{
ACPI_ERROR ((AE_INFO,
"Illegal I/O port address/length above 64K: %p/0x%X",
ACPI_CAST_PTR (void, Address), ByteWidth));
return_ACPI_STATUS (AE_LIMIT);
}
/* Exit if requested address is not within the protected port table */
if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End)
{
return_ACPI_STATUS (AE_OK);
}
/* Check request against the list of protected I/O ports */
for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++)
{
/*
* Check if the requested address range will write to a reserved
* port. Four cases to consider:
*
* 1) Address range is contained completely in the port address range
* 2) Address range overlaps port range at the port range start
* 3) Address range overlaps port range at the port range end
* 4) Address range completely encompasses the port range
*/
if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))
{
/* Port illegality may depend on the _OSI calls made by the BIOS */
if (AcpiGbl_OsiData >= PortInfo->OsiDependency)
{
ACPI_DEBUG_PRINT ((ACPI_DB_IO,
"Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,
PortInfo->Start, PortInfo->End));
return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS);
}
}
/* Finished if address range ends before the end of this port */
if (LastAddress <= PortInfo->End)
{
break;
}
}
return_ACPI_STATUS (AE_OK);
}
/******************************************************************************
*
* FUNCTION: AcpiHwReadPort
*
* PARAMETERS: Address Address of I/O port/register to read
* Value Where value is placed
* Width Number of bits
*
* RETURN: Status and value read from port
*
* DESCRIPTION: Read data from an I/O port or register. This is a front-end
* to AcpiOsReadPort that performs validation on both the port
* address and the length.
*
*****************************************************************************/
ACPI_STATUS
AcpiHwReadPort (
ACPI_IO_ADDRESS Address,
UINT32 *Value,
UINT32 Width)
{
ACPI_STATUS Status;
UINT32 OneByte;
UINT32 i;
/* Truncate address to 16 bits if requested */
if (AcpiGbl_TruncateIoAddresses)
{
Address &= ACPI_UINT16_MAX;
}
/* Validate the entire request and perform the I/O */
Status = AcpiHwValidateIoRequest (Address, Width);
if (ACPI_SUCCESS (Status))
{
Status = AcpiOsReadPort (Address, Value, Width);
return (Status);
}
if (Status != AE_AML_ILLEGAL_ADDRESS)
{
return (Status);
}
/*
* There has been a protection violation within the request. Fall
* back to byte granularity port I/O and ignore the failing bytes.
* This provides Windows compatibility.
*/
for (i = 0, *Value = 0; i < Width; i += 8)
{
/* Validate and read one byte */
if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
{
Status = AcpiOsReadPort (Address, &OneByte, 8);
if (ACPI_FAILURE (Status))
{
return (Status);
}
*Value |= (OneByte << i);
}
Address++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: AcpiHwWritePort
*
* PARAMETERS: Address Address of I/O port/register to write
* Value Value to write
* Width Number of bits
*
* RETURN: Status
*
* DESCRIPTION: Write data to an I/O port or register. This is a front-end
* to AcpiOsWritePort that performs validation on both the port
* address and the length.
*
*****************************************************************************/
ACPI_STATUS
AcpiHwWritePort (
ACPI_IO_ADDRESS Address,
UINT32 Value,
UINT32 Width)
{
ACPI_STATUS Status;
UINT32 i;
/* Truncate address to 16 bits if requested */
if (AcpiGbl_TruncateIoAddresses)
{
Address &= ACPI_UINT16_MAX;
}
/* Validate the entire request and perform the I/O */
Status = AcpiHwValidateIoRequest (Address, Width);
if (ACPI_SUCCESS (Status))
{
Status = AcpiOsWritePort (Address, Value, Width);
return (Status);
}
if (Status != AE_AML_ILLEGAL_ADDRESS)
{
return (Status);
}
/*
* There has been a protection violation within the request. Fall
* back to byte granularity port I/O and ignore the failing bytes.
* This provides Windows compatibility.
*/
for (i = 0; i < Width; i += 8)
{
/* Validate and write one byte */
if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
{
Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);
if (ACPI_FAILURE (Status))
{
return (Status);
}
}
Address++;
}
return (AE_OK);
}