drivers/acpi/acpica/hwvalid.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: hwvalid - I/O request validation
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2009, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwvalid")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);
  54
  55 /*
  56  * Protected I/O ports. Some ports are always illegal, and some are
  57  * conditionally illegal. This table must remain ordered by port address.
  58  *
  59  * The table is used to implement the Microsoft port access rules that
  60  * first appeared in Windows XP. Some ports are always illegal, and some
  61  * ports are only illegal if the BIOS calls _OSI with a win_xP string or
  62  * later (meaning that the BIOS itelf is post-XP.)
  63  *
  64  * This provides ACPICA with the desired port protections and
  65  * Microsoft compatibility.
  66  *
  67  * Description of port entries:
  68  *  DMA:   DMA controller
  69  *  PIC0:  Programmable Interrupt Controller (8259_a)
  70  *  PIT1:  System Timer 1
  71  *  PIT2:  System Timer 2 failsafe
  72  *  RTC:   Real-time clock
  73  *  CMOS:  Extended CMOS
  74  *  DMA1:  DMA 1 page registers
  75  *  DMA1L: DMA 1 Ch 0 low page
  76  *  DMA2:  DMA 2 page registers
  77  *  DMA2L: DMA 2 low page refresh
  78  *  ARBC:  Arbitration control
  79  *  SETUP: Reserved system board setup
  80  *  POS:   POS channel select
  81  *  PIC1:  Cascaded PIC
  82  *  IDMA:  ISA DMA
  83  *  ELCR:  PIC edge/level registers
  84  *  PCI:   PCI configuration space
  85  */
  86 static const struct acpi_port_info acpi_protected_ports[] = {
  87         {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
  88         {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
  89         {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
  90         {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
  91         {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
  92         {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
  93         {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
  94         {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
  95         {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
  96         {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
  97         {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
  98         {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
  99         {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
 100         {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
 101         {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
 102         {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
 103 };
 104
 105 #define ACPI_PORT_INFO_ENTRIES  ACPI_ARRAY_LENGTH (acpi_protected_ports)
 106
 107 /******************************************************************************
 108  *
 109  * FUNCTION:    acpi_hw_validate_io_request
 110  *
 111  * PARAMETERS:  Address             Address of I/O port/register
 112  *              bit_width           Number of bits (8,16,32)
 113  *
 114  * RETURN:      Status
 115  *
 116  * DESCRIPTION: Validates an I/O request (address/length). Certain ports are
 117  *              always illegal and some ports are only illegal depending on
 118  *              the requests the BIOS AML code makes to the predefined
 119  *              _OSI method.
 120  *
 121  ******************************************************************************/
 122
 123 static acpi_status
 124 acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
 125 {
 126         u32 i;
 127         u32 byte_width;
 128         acpi_io_address last_address;
 129         const struct acpi_port_info *port_info;
 130
 131         ACPI_FUNCTION_TRACE(hw_validate_io_request);
 132
 133         /* Supported widths are 8/16/32 */
 134
 135         if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
 136                 return AE_BAD_PARAMETER;
 137         }
 138
 139         port_info = acpi_protected_ports;
 140         byte_width = ACPI_DIV_8(bit_width);
 141         last_address = address + byte_width - 1;
 142
 143         ACPI_DEBUG_PRINT((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
 144                           ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
 145                                                                       last_address),
 146                           byte_width));
 147
 148         /* Maximum 16-bit address in I/O space */
 149
 150         if (last_address > ACPI_UINT16_MAX) {
 151                 ACPI_ERROR((AE_INFO,
 152                             "Illegal I/O port address/length above 64K: 0x%p/%X",
 153                             ACPI_CAST_PTR(void, address), byte_width));
 154                 return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
 155         }
 156
 157         /* Exit if requested address is not within the protected port table */
 158
 159         if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) {
 160                 return_ACPI_STATUS(AE_OK);
 161         }
 162
 163         /* Check request against the list of protected I/O ports */
 164
 165         for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) {
 166                 /*
 167                  * Check if the requested address range will write to a reserved
 168                  * port. Four cases to consider:
 169                  *
 170                  * 1) Address range is contained completely in the port address range
 171                  * 2) Address range overlaps port range at the port range start
 172                  * 3) Address range overlaps port range at the port range end
 173                  * 4) Address range completely encompasses the port range
 174                  */
 175                 if ((address <= port_info->end)
 176                     && (last_address >= port_info->start)) {
 177
 178                         /* Port illegality may depend on the _OSI calls made by the BIOS */
 179
 180                         if (acpi_gbl_osi_data >= port_info->osi_dependency) {
 181                                 ACPI_ERROR((AE_INFO,
 182                                             "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
 183                                             ACPI_CAST_PTR(void, address),
 184                                             byte_width, port_info->name,
 185                                             port_info->start, port_info->end));
 186
 187                                 return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
 188                         }
 189                 }
 190
 191                 /* Finished if address range ends before the end of this port */
 192
 193                 if (last_address <= port_info->end) {
 194                         break;
 195                 }
 196         }
 197
 198         return_ACPI_STATUS(AE_OK);
 199 }
 200
 201 /******************************************************************************
 202  *
 203  * FUNCTION:    acpi_hw_read_port
 204  *
 205  * PARAMETERS:  Address             Address of I/O port/register to read
 206  *              Value               Where value is placed
 207  *              Width               Number of bits
 208  *
 209  * RETURN:      Value read from port
 210  *
 211  * DESCRIPTION: Read data from an I/O port or register. This is a front-end
 212  *              to acpi_os_read_port that performs validation on both the port
 213  *              address and the length.
 214  *
 215  *****************************************************************************/
 216
 217 acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
 218 {
 219         acpi_status status;
 220
 221         status = acpi_hw_validate_io_request(address, width);
 222         if (ACPI_FAILURE(status)) {
 223                 return status;
 224         }
 225
 226         status = acpi_os_read_port(address, value, width);
 227         return status;
 228 }
 229
 230 /******************************************************************************
 231  *
 232  * FUNCTION:    acpi_hw_write_port
 233  *
 234  * PARAMETERS:  Address             Address of I/O port/register to write
 235  *              Value               Value to write
 236  *              Width               Number of bits
 237  *
 238  * RETURN:      None
 239  *
 240  * DESCRIPTION: Write data to an I/O port or register. This is a front-end
 241  *              to acpi_os_write_port that performs validation on both the port
 242  *              address and the length.
 243  *
 244  *****************************************************************************/
 245
 246 acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
 247 {
 248         acpi_status status;
 249
 250         status = acpi_hw_validate_io_request(address, width);
 251         if (ACPI_FAILURE(status)) {
 252                 return status;
 253         }
 254
 255         status = acpi_os_write_port(address, value, width);
 256         return status;
 257 }