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/******************************************************************************

 *

 * Module Name: hwvalid - I/O request validation

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, 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 

#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 %8.8X%8.8X LastAddress %8.8X%8.8X Length %X",

			  ACPI_FORMAT_UINT64(address),

			  ACPI_FORMAT_UINT64(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: %8.8X%8.8X/0x%X",

			    ACPI_FORMAT_UINT64(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%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)",

						  ACPI_FORMAT_UINT64(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);

}