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hwvalid.c
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257 lines (223 loc) · 8.71 KB
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linux
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hwvalid.c
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/****************************************************************************** * * 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}, {"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; }
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