| |
| /****************************************************************************** |
| * |
| * Module Name: hwvalid - I/O request validation |
| * |
| *****************************************************************************/ |
| |
| /* |
| * 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. |
| */ |
| |
| #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 (8259_a) |
| * 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)) { |
| 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: 0x%p/%X", |
| ACPI_CAST_PTR(void, address), byte_width)); |
| return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); |
| } |
| |
| /* 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_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)); |
| |
| 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: 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; |
| |
| status = acpi_hw_validate_io_request(address, width); |
| if (ACPI_FAILURE(status)) { |
| return status; |
| } |
| |
| status = acpi_os_read_port(address, value, width); |
| return status; |
| } |
| |
| /****************************************************************************** |
| * |
| * 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. |
| * |
| *****************************************************************************/ |
| |
| acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width) |
| { |
| acpi_status status; |
| |
| status = acpi_hw_validate_io_request(address, width); |
| if (ACPI_FAILURE(status)) { |
| return status; |
| } |
| |
| status = acpi_os_write_port(address, value, width); |
| return status; |
| } |