hwvalid.c

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/******************************************************************************
 *
 * Module Name: hwvalid - I/O request validation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_HARDWARE
ACPI_MODULE_NAME("hwvalid")

/* Local prototypes */
static acpi_status
acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);

/*
 * 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 win_XP 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 struct acpi_port_info acpi_protected_ports[] = {
    {"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 (acpi_protected_ports)

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_validate_io_request
 *
 * PARAMETERS:  Address             Address of I/O port/register
 *              bit_width           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
acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
{
    u32 i;
    u32 byte_width;
    acpi_io_address last_address;
    const struct acpi_port_info *port_info;

    ACPI_FUNCTION_TRACE(hw_validate_io_request);

    /* Supported widths are 8/16/32 */

    if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
        ACPI_ERROR((AE_INFO,
                "Bad BitWidth parameter: %8.8X", bit_width));
        return AE_BAD_PARAMETER;
    }

    port_info = acpi_protected_ports;
    byte_width = ACPI_DIV_8(bit_width);
    last_address = address + byte_width - 1;

    ACPI_DEBUG_PRINT((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
              ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
                                      last_address),
              byte_width));

    /* Maximum 16-bit address in I/O space */

    if (last_address > ACPI_UINT16_MAX) {
        ACPI_ERROR((AE_INFO,
                "Illegal I/O port address/length above 64K: %p/0x%X",
                ACPI_CAST_PTR(void, address), byte_width));
        return_ACPI_STATUS(AE_LIMIT);
    }

    /* Exit if requested address is not within the protected port table */

    if (address > acpi_protected_ports[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++, port_info++) {
        /*
         * 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 <= port_info->end)
            && (last_address >= port_info->start)) {

            /* Port illegality may depend on the _OSI calls made by the BIOS */

            if (acpi_gbl_osi_data >= port_info->osi_dependency) {
                ACPI_DEBUG_PRINT((ACPI_DB_IO,
                          "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
                          ACPI_CAST_PTR(void, address),
                          byte_width, port_info->name,
                          port_info->start,
                          port_info->end));

                return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
            }
        }

        /* Finished if address range ends before the end of this port */

        if (last_address <= port_info->end) {
            break;
        }
    }

    return_ACPI_STATUS(AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_read_port
 *
 * 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 acpi_os_read_port that performs validation on both the port
 *              address and the length.
 *
 *****************************************************************************/

acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
{
    acpi_status status;
    u32 one_byte;
    u32 i;

    /* Truncate address to 16 bits if requested */

    if (acpi_gbl_truncate_io_addresses) {
        address &= ACPI_UINT16_MAX;
    }

    /* Validate the entire request and perform the I/O */

    status = acpi_hw_validate_io_request(address, width);
    if (ACPI_SUCCESS(status)) {
        status = acpi_os_read_port(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 (acpi_hw_validate_io_request(address, 8) == AE_OK) {
            status = acpi_os_read_port(address, &one_byte, 8);
            if (ACPI_FAILURE(status)) {
                return status;
            }

            *value |= (one_byte << i);
        }

        address++;
    }

    return AE_OK;
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_write_port
 *
 * 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 acpi_os_write_port that performs validation on both the port
 *              address and the length.
 *
 *****************************************************************************/

acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
{
    acpi_status status;
    u32 i;

    /* Truncate address to 16 bits if requested */

    if (acpi_gbl_truncate_io_addresses) {
        address &= ACPI_UINT16_MAX;
    }

    /* Validate the entire request and perform the I/O */

    status = acpi_hw_validate_io_request(address, width);
    if (ACPI_SUCCESS(status)) {
        status = acpi_os_write_port(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 (acpi_hw_validate_io_request(address, 8) == AE_OK) {
            status =
                acpi_os_write_port(address, (value >> i) & 0xFF, 8);
            if (ACPI_FAILURE(status)) {
                return status;
            }
        }

        address++;
    }

    return AE_OK;
}