/******************************************************************************
*
* Module Name: hwvalid - I/O request validation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#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;
UINT64 Max16;
UINT64 Tmp64;
ACPI_FUNCTION_TRACE (HwValidateIoRequest);
/* Supported widths are 8/16/32 */
if ((BitWidth != 8) &&
(BitWidth != 16) &&
(BitWidth != 32))
{
ACPI_ERROR ((AE_INFO,
"Bad BitWidth parameter: %8.8X", BitWidth));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
PortInfo = AcpiProtectedPorts;
ByteWidth = ACPI_DIV_8 (BitWidth);
LastAddress = Address + ByteWidth - 1;
ACPI_DEBUG_PRINT ((ACPI_DB_IO,
"Address %8.8X%8.8X LastAddress %8.8X%8.8X Length %X",
ACPI_FORMAT_UINT64 (Address), ACPI_FORMAT_UINT64 (LastAddress),
ByteWidth));
/* Maximum 16-bit address in I/O space */
Max16 = (UINT64) ACPI_UINT16_MAX;
ACPI_MOVE_64_TO_64(&Tmp64, &Max16);
if ((UINT64)LastAddress > Tmp64)
{
ACPI_ERROR ((AE_INFO,
"Illegal I/O port address/length above 64K: %8.8X%8.8X/0x%X",
ACPI_FORMAT_UINT64 (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. There are 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_VALUES,
"Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)\n",
ACPI_FORMAT_UINT64 (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 (data) is returned
* 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 compatibility with other ACPI implementations.
*/
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 compatibility with other ACPI implementations.
*/
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);
}