/****************************************************************************** * * Module Name: hwvalid - I/O request validation * *****************************************************************************/ /* * Copyright (C) 2000 - 2011, 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. */ #define __HWVALID_C__ #include "acpi.h" #include "accommon.h" #define _COMPONENT ACPI_HARDWARE ACPI_MODULE_NAME ("hwvalid") /* Local prototypes */ static ACPI_STATUS AcpiHwValidateIoRequest ( ACPI_IO_ADDRESS Address, UINT32 BitWidth); /* * 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 WinXP 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 ACPI_PORT_INFO AcpiProtectedPorts[] = { {"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 (AcpiProtectedPorts) /****************************************************************************** * * FUNCTION: AcpiHwValidateIoRequest * * PARAMETERS: Address Address of I/O port/register * BitWidth 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 AcpiHwValidateIoRequest ( ACPI_IO_ADDRESS Address, UINT32 BitWidth) { UINT32 i; UINT32 ByteWidth; ACPI_IO_ADDRESS LastAddress; const ACPI_PORT_INFO *PortInfo; ACPI_FUNCTION_TRACE (HwValidateIoRequest); /* Supported widths are 8/16/32 */ if ((BitWidth != 8) && (BitWidth != 16) && (BitWidth != 32)) { return (AE_BAD_PARAMETER); } PortInfo = AcpiProtectedPorts; ByteWidth = ACPI_DIV_8 (BitWidth); LastAddress = Address + ByteWidth - 1; ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X", ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress), ByteWidth)); /* Maximum 16-bit address in I/O space */ if (LastAddress > ACPI_UINT16_MAX) { ACPI_ERROR ((AE_INFO, "Illegal I/O port address/length above 64K: %p/0x%X", ACPI_CAST_PTR (void, Address), ByteWidth)); return_ACPI_STATUS (AE_LIMIT); } /* Exit if requested address is not within the protected port table */ if (Address > AcpiProtectedPorts[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++, PortInfo++) { /* * 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 <= PortInfo->End) && (LastAddress >= PortInfo->Start)) { /* Port illegality may depend on the _OSI calls made by the BIOS */ if (AcpiGbl_OsiData >= PortInfo->OsiDependency) { ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)", ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name, PortInfo->Start, PortInfo->End)); return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS); } } /* Finished if address range ends before the end of this port */ if (LastAddress <= PortInfo->End) { break; } } return_ACPI_STATUS (AE_OK); } /****************************************************************************** * * FUNCTION: AcpiHwReadPort * * 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 AcpiOsReadPort that performs validation on both the port * address and the length. * *****************************************************************************/ ACPI_STATUS AcpiHwReadPort ( ACPI_IO_ADDRESS Address, UINT32 *Value, UINT32 Width) { ACPI_STATUS Status; UINT32 OneByte; UINT32 i; /* Truncate address to 16 bits if requested */ if (AcpiGbl_TruncateIoAddresses) { Address &= ACPI_UINT16_MAX; } /* Validate the entire request and perform the I/O */ Status = AcpiHwValidateIoRequest (Address, Width); if (ACPI_SUCCESS (Status)) { Status = AcpiOsReadPort (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 (AcpiHwValidateIoRequest (Address, 8) == AE_OK) { Status = AcpiOsReadPort (Address, &OneByte, 8); if (ACPI_FAILURE (Status)) { return (Status); } *Value |= (OneByte << i); } Address++; } return (AE_OK); } /****************************************************************************** * * FUNCTION: AcpiHwWritePort * * 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 AcpiOsWritePort that performs validation on both the port * address and the length. * *****************************************************************************/ ACPI_STATUS AcpiHwWritePort ( ACPI_IO_ADDRESS Address, UINT32 Value, UINT32 Width) { ACPI_STATUS Status; UINT32 i; /* Truncate address to 16 bits if requested */ if (AcpiGbl_TruncateIoAddresses) { Address &= ACPI_UINT16_MAX; } /* Validate the entire request and perform the I/O */ Status = AcpiHwValidateIoRequest (Address, Width); if (ACPI_SUCCESS (Status)) { Status = AcpiOsWritePort (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 (AcpiHwValidateIoRequest (Address, 8) == AE_OK) { Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8); if (ACPI_FAILURE (Status)) { return (Status); } } Address++; } return (AE_OK); }