366 lines
11 KiB
C
366 lines
11 KiB
C
/******************************************************************************
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*
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* Module Name: hwvalid - I/O request validation
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#define __HWVALID_C__
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#include "acpi.h"
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#include "accommon.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME ("hwvalid")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiHwValidateIoRequest (
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ACPI_IO_ADDRESS Address,
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UINT32 BitWidth);
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/*
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* Protected I/O ports. Some ports are always illegal, and some are
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* conditionally illegal. This table must remain ordered by port address.
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*
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* The table is used to implement the Microsoft port access rules that
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* first appeared in Windows XP. Some ports are always illegal, and some
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* ports are only illegal if the BIOS calls _OSI with a WinXP string or
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* later (meaning that the BIOS itelf is post-XP.)
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*
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* This provides ACPICA with the desired port protections and
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* Microsoft compatibility.
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*
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* Description of port entries:
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* DMA: DMA controller
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* PIC0: Programmable Interrupt Controller (8259A)
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* PIT1: System Timer 1
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* PIT2: System Timer 2 failsafe
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* RTC: Real-time clock
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* CMOS: Extended CMOS
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* DMA1: DMA 1 page registers
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* DMA1L: DMA 1 Ch 0 low page
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* DMA2: DMA 2 page registers
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* DMA2L: DMA 2 low page refresh
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* ARBC: Arbitration control
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* SETUP: Reserved system board setup
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* POS: POS channel select
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* PIC1: Cascaded PIC
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* IDMA: ISA DMA
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* ELCR: PIC edge/level registers
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* PCI: PCI configuration space
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*/
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static const ACPI_PORT_INFO AcpiProtectedPorts[] =
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{
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{"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
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{"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
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{"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
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{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
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{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
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{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
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{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
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{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
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{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
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{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
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{"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
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{"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
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{"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
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{"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
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{"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
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{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
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{"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
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};
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#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts)
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/******************************************************************************
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*
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* FUNCTION: AcpiHwValidateIoRequest
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*
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* PARAMETERS: Address Address of I/O port/register
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* BitWidth Number of bits (8,16,32)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Validates an I/O request (address/length). Certain ports are
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* always illegal and some ports are only illegal depending on
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* the requests the BIOS AML code makes to the predefined
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* _OSI method.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiHwValidateIoRequest (
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ACPI_IO_ADDRESS Address,
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UINT32 BitWidth)
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{
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UINT32 i;
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UINT32 ByteWidth;
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ACPI_IO_ADDRESS LastAddress;
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const ACPI_PORT_INFO *PortInfo;
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ACPI_FUNCTION_TRACE (HwValidateIoRequest);
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/* Supported widths are 8/16/32 */
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if ((BitWidth != 8) &&
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(BitWidth != 16) &&
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(BitWidth != 32))
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{
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ACPI_ERROR ((AE_INFO,
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"Bad BitWidth parameter: %8.8X", BitWidth));
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return (AE_BAD_PARAMETER);
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}
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PortInfo = AcpiProtectedPorts;
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ByteWidth = ACPI_DIV_8 (BitWidth);
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LastAddress = Address + ByteWidth - 1;
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ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
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ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),
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ByteWidth));
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/* Maximum 16-bit address in I/O space */
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if (LastAddress > ACPI_UINT16_MAX)
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{
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ACPI_ERROR ((AE_INFO,
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"Illegal I/O port address/length above 64K: %p/0x%X",
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ACPI_CAST_PTR (void, Address), ByteWidth));
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return_ACPI_STATUS (AE_LIMIT);
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}
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/* Exit if requested address is not within the protected port table */
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if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End)
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{
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return_ACPI_STATUS (AE_OK);
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}
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/* Check request against the list of protected I/O ports */
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for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++)
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{
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/*
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* Check if the requested address range will write to a reserved
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* port. Four cases to consider:
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*
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* 1) Address range is contained completely in the port address range
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* 2) Address range overlaps port range at the port range start
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* 3) Address range overlaps port range at the port range end
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* 4) Address range completely encompasses the port range
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*/
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if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))
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{
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/* Port illegality may depend on the _OSI calls made by the BIOS */
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if (AcpiGbl_OsiData >= PortInfo->OsiDependency)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_IO,
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"Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
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ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,
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PortInfo->Start, PortInfo->End));
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return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS);
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}
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}
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/* Finished if address range ends before the end of this port */
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if (LastAddress <= PortInfo->End)
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{
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break;
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}
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}
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return_ACPI_STATUS (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwReadPort
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*
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* PARAMETERS: Address Address of I/O port/register to read
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* Value Where value is placed
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* Width Number of bits
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*
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* RETURN: Status and value read from port
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*
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* DESCRIPTION: Read data from an I/O port or register. This is a front-end
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* to AcpiOsReadPort that performs validation on both the port
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* address and the length.
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*
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*****************************************************************************/
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ACPI_STATUS
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AcpiHwReadPort (
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ACPI_IO_ADDRESS Address,
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UINT32 *Value,
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UINT32 Width)
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{
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ACPI_STATUS Status;
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UINT32 OneByte;
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UINT32 i;
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/* Truncate address to 16 bits if requested */
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if (AcpiGbl_TruncateIoAddresses)
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{
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Address &= ACPI_UINT16_MAX;
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}
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/* Validate the entire request and perform the I/O */
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Status = AcpiHwValidateIoRequest (Address, Width);
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if (ACPI_SUCCESS (Status))
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{
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Status = AcpiOsReadPort (Address, Value, Width);
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return (Status);
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}
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if (Status != AE_AML_ILLEGAL_ADDRESS)
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{
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return (Status);
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}
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/*
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* There has been a protection violation within the request. Fall
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* back to byte granularity port I/O and ignore the failing bytes.
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* This provides Windows compatibility.
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*/
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for (i = 0, *Value = 0; i < Width; i += 8)
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{
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/* Validate and read one byte */
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if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
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{
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Status = AcpiOsReadPort (Address, &OneByte, 8);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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*Value |= (OneByte << i);
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}
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Address++;
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}
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return (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiHwWritePort
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*
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* PARAMETERS: Address Address of I/O port/register to write
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* Value Value to write
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* Width Number of bits
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write data to an I/O port or register. This is a front-end
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* to AcpiOsWritePort that performs validation on both the port
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* address and the length.
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*
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*****************************************************************************/
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ACPI_STATUS
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AcpiHwWritePort (
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ACPI_IO_ADDRESS Address,
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UINT32 Value,
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UINT32 Width)
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{
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ACPI_STATUS Status;
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UINT32 i;
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/* Truncate address to 16 bits if requested */
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if (AcpiGbl_TruncateIoAddresses)
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{
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Address &= ACPI_UINT16_MAX;
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}
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/* Validate the entire request and perform the I/O */
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Status = AcpiHwValidateIoRequest (Address, Width);
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if (ACPI_SUCCESS (Status))
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{
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Status = AcpiOsWritePort (Address, Value, Width);
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return (Status);
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}
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if (Status != AE_AML_ILLEGAL_ADDRESS)
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{
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return (Status);
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}
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/*
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* There has been a protection violation within the request. Fall
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* back to byte granularity port I/O and ignore the failing bytes.
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* This provides Windows compatibility.
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*/
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for (i = 0; i < Width; i += 8)
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{
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/* Validate and write one byte */
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if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
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{
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Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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}
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Address++;
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}
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return (AE_OK);
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}
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