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Protect certain I/O ports from reads/writes. Provides MS compatibility. New module, hwvalid.c Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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| /****************************************************************************** | ||
| * | ||
| * Module Name: hwvalid - I/O request validation | ||
| * | ||
| *****************************************************************************/ | ||
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| /* | ||
| * Copyright (C) 2000 - 2009, 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. | ||
| */ | ||
|
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| #include <acpi/acpi.h> | ||
| #include "accommon.h" | ||
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| #define _COMPONENT ACPI_HARDWARE | ||
| ACPI_MODULE_NAME("hwvalid") | ||
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| /* Local prototypes */ | ||
| static acpi_status | ||
| acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width); | ||
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| /* | ||
| * 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. | ||
| */ | ||
| static const struct acpi_port_info acpi_protected_ports[] = { | ||
| {"DMA1", 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}, | ||
| {"DMA1", 0x0087, 0x0087, ACPI_OSI_WIN_XP}, | ||
| {"DMA2", 0x0089, 0x0089, ACPI_OSI_WIN_XP}, | ||
| {"DMA2", 0x008A, 0x008B, ACPI_OSI_WIN_XP}, | ||
| {"DMA2", 0x008F, 0x008F, ACPI_OSI_WIN_XP}, | ||
| {"Arb", 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}, | ||
| {"DMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP}, | ||
| {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL}, | ||
| {"PCI", 0x0CF8, 0x0D00, ACPI_OSI_WIN_XP} | ||
| }; | ||
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| #define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (acpi_protected_ports) | ||
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| /****************************************************************************** | ||
| * | ||
| * 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. | ||
| * | ||
| ******************************************************************************/ | ||
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| 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; | ||
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| ACPI_FUNCTION_TRACE(hw_validate_io_request); | ||
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| /* Supported widths are 8/16/32 */ | ||
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| if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) { | ||
| return AE_BAD_PARAMETER; | ||
| } | ||
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| port_info = acpi_protected_ports; | ||
| byte_width = ACPI_DIV_8(bit_width); | ||
| last_address = address + byte_width - 1; | ||
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| 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)); | ||
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| /* Maximum 16-bit address in I/O space */ | ||
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| if (last_address > ACPI_UINT16_MAX) { | ||
| ACPI_ERROR((AE_INFO, | ||
| "Illegal I/O port address/length above 64K: 0x%p/%X", | ||
| ACPI_CAST_PTR(void, address), byte_width)); | ||
| return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); | ||
| } | ||
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| /* Exit if requested address is not within the protected port table */ | ||
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| if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) { | ||
| return_ACPI_STATUS(AE_OK); | ||
| } | ||
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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++, 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)) { | ||
|
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| /* Port illegality may depend on the _OSI calls made by the BIOS */ | ||
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| if (acpi_gbl_osi_data >= port_info->osi_dependency) { | ||
| ACPI_ERROR((AE_INFO, | ||
| "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)); | ||
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| return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); | ||
| } | ||
| } | ||
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| /* Finished if address range ends before the end of this port */ | ||
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| if (last_address <= port_info->end) { | ||
| break; | ||
| } | ||
| } | ||
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| return_ACPI_STATUS(AE_OK); | ||
| } | ||
|
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| /****************************************************************************** | ||
| * | ||
| * 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: 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. | ||
| * | ||
| *****************************************************************************/ | ||
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| acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width) | ||
| { | ||
| acpi_status status; | ||
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| status = acpi_hw_validate_io_request(address, width); | ||
| if (ACPI_FAILURE(status)) { | ||
| return status; | ||
| } | ||
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| status = acpi_os_read_port(address, value, width); | ||
| return status; | ||
| } | ||
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| /****************************************************************************** | ||
| * | ||
| * FUNCTION: acpi_hw_write_port | ||
| * | ||
| * PARAMETERS: Address Address of I/O port/register to write | ||
| * Value Value to write | ||
| * Width Number of bits | ||
| * | ||
| * RETURN: None | ||
| * | ||
| * 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. | ||
| * | ||
| *****************************************************************************/ | ||
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| acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width) | ||
| { | ||
| acpi_status status; | ||
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| status = acpi_hw_validate_io_request(address, width); | ||
| if (ACPI_FAILURE(status)) { | ||
| return status; | ||
| } | ||
|
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| status = acpi_os_write_port(address, value, width); | ||
| return status; | ||
| } |
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