drivers/acpi/acpica/hwvalid.c

   1 /******************************************************************************
   2  *
   3  * Module Name: hwvalid - I/O request validation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_HARDWARE
  48 ACPI_MODULE_NAME("hwvalid")
  49
  50 /* Local prototypes */
  51 static acpi_status
  52 acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);
  53
  54 /*
  55  * Protected I/O ports. Some ports are always illegal, and some are
  56  * conditionally illegal. This table must remain ordered by port address.
  57  *
  58  * The table is used to implement the Microsoft port access rules that
  59  * first appeared in Windows XP. Some ports are always illegal, and some
  60  * ports are only illegal if the BIOS calls _OSI with a win_XP string or
  61  * later (meaning that the BIOS itelf is post-XP.)
  62  *
  63  * This provides ACPICA with the desired port protections and
  64  * Microsoft compatibility.
  65  *
  66  * Description of port entries:
  67  *  DMA:   DMA controller
  68  *  PIC0:  Programmable Interrupt Controller (8259A)
  69  *  PIT1:  System Timer 1
  70  *  PIT2:  System Timer 2 failsafe
  71  *  RTC:   Real-time clock
  72  *  CMOS:  Extended CMOS
  73  *  DMA1:  DMA 1 page registers
  74  *  DMA1L: DMA 1 Ch 0 low page
  75  *  DMA2:  DMA 2 page registers
  76  *  DMA2L: DMA 2 low page refresh
  77  *  ARBC:  Arbitration control
  78  *  SETUP: Reserved system board setup
  79  *  POS:   POS channel select
  80  *  PIC1:  Cascaded PIC
  81  *  IDMA:  ISA DMA
  82  *  ELCR:  PIC edge/level registers
  83  *  PCI:   PCI configuration space
  84  */
  85 static const struct acpi_port_info acpi_protected_ports[] = {
  86         {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
  87         {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
  88         {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
  89         {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
  90         {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
  91         {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
  92         {"DMA1", 0x0081, 0x0083, 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                 ACPI_ERROR((AE_INFO,
 137                             "Bad BitWidth parameter: %8.8X", bit_width));
 138                 return (AE_BAD_PARAMETER);
 139         }
 140
 141         port_info = acpi_protected_ports;
 142         byte_width = ACPI_DIV_8(bit_width);
 143         last_address = address + byte_width - 1;
 144
 145         ACPI_DEBUG_PRINT((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
 146                           ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
 147                                                                       last_address),
 148                           byte_width));
 149
 150         /* Maximum 16-bit address in I/O space */
 151
 152         if (last_address > ACPI_UINT16_MAX) {
 153                 ACPI_ERROR((AE_INFO,
 154                             "Illegal I/O port address/length above 64K: %p/0x%X",
 155                             ACPI_CAST_PTR(void, address), byte_width));
 156                 return_ACPI_STATUS(AE_LIMIT);
 157         }
 158
 159         /* Exit if requested address is not within the protected port table */
 160
 161         if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) {
 162                 return_ACPI_STATUS(AE_OK);
 163         }
 164
 165         /* Check request against the list of protected I/O ports */
 166
 167         for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) {
 168                 /*
 169                  * Check if the requested address range will write to a reserved
 170                  * port. Four cases to consider:
 171                  *
 172                  * 1) Address range is contained completely in the port address range
 173                  * 2) Address range overlaps port range at the port range start
 174                  * 3) Address range overlaps port range at the port range end
 175                  * 4) Address range completely encompasses the port range
 176                  */
 177                 if ((address <= port_info->end)
 178                     && (last_address >= port_info->start)) {
 179
 180                         /* Port illegality may depend on the _OSI calls made by the BIOS */
 181
 182                         if (acpi_gbl_osi_data >= port_info->osi_dependency) {
 183                                 ACPI_DEBUG_PRINT((ACPI_DB_IO,
 184                                                   "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
 185                                                   ACPI_CAST_PTR(void, address),
 186                                                   byte_width, port_info->name,
 187                                                   port_info->start,
 188                                                   port_info->end));
 189
 190                                 return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
 191                         }
 192                 }
 193
 194                 /* Finished if address range ends before the end of this port */
 195
 196                 if (last_address <= port_info->end) {
 197                         break;
 198                 }
 199         }
 200
 201         return_ACPI_STATUS(AE_OK);
 202 }
 203
 204 /******************************************************************************
 205  *
 206  * FUNCTION:    acpi_hw_read_port
 207  *
 208  * PARAMETERS:  Address             Address of I/O port/register to read
 209  *              Value               Where value is placed
 210  *              Width               Number of bits
 211  *
 212  * RETURN:      Status and value read from port
 213  *
 214  * DESCRIPTION: Read data from an I/O port or register. This is a front-end
 215  *              to acpi_os_read_port that performs validation on both the port
 216  *              address and the length.
 217  *
 218  *****************************************************************************/
 219
 220 acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
 221 {
 222         acpi_status status;
 223         u32 one_byte;
 224         u32 i;
 225
 226         /* Truncate address to 16 bits if requested */
 227
 228         if (acpi_gbl_truncate_io_addresses) {
 229                 address &= ACPI_UINT16_MAX;
 230         }
 231
 232         /* Validate the entire request and perform the I/O */
 233
 234         status = acpi_hw_validate_io_request(address, width);
 235         if (ACPI_SUCCESS(status)) {
 236                 status = acpi_os_read_port(address, value, width);
 237                 return (status);
 238         }
 239
 240         if (status != AE_AML_ILLEGAL_ADDRESS) {
 241                 return (status);
 242         }
 243
 244         /*
 245          * There has been a protection violation within the request. Fall
 246          * back to byte granularity port I/O and ignore the failing bytes.
 247          * This provides Windows compatibility.
 248          */
 249         for (i = 0, *value = 0; i < width; i += 8) {
 250
 251                 /* Validate and read one byte */
 252
 253                 if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
 254                         status = acpi_os_read_port(address, &one_byte, 8);
 255                         if (ACPI_FAILURE(status)) {
 256                                 return (status);
 257                         }
 258
 259                         *value |= (one_byte << i);
 260                 }
 261
 262                 address++;
 263         }
 264
 265         return (AE_OK);
 266 }
 267
 268 /******************************************************************************
 269  *
 270  * FUNCTION:    acpi_hw_write_port
 271  *
 272  * PARAMETERS:  Address             Address of I/O port/register to write
 273  *              Value               Value to write
 274  *              Width               Number of bits
 275  *
 276  * RETURN:      Status
 277  *
 278  * DESCRIPTION: Write data to an I/O port or register. This is a front-end
 279  *              to acpi_os_write_port that performs validation on both the port
 280  *              address and the length.
 281  *
 282  *****************************************************************************/
 283
 284 acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
 285 {
 286         acpi_status status;
 287         u32 i;
 288
 289         /* Truncate address to 16 bits if requested */
 290
 291         if (acpi_gbl_truncate_io_addresses) {
 292                 address &= ACPI_UINT16_MAX;
 293         }
 294
 295         /* Validate the entire request and perform the I/O */
 296
 297         status = acpi_hw_validate_io_request(address, width);
 298         if (ACPI_SUCCESS(status)) {
 299                 status = acpi_os_write_port(address, value, width);
 300                 return (status);
 301         }
 302
 303         if (status != AE_AML_ILLEGAL_ADDRESS) {
 304                 return (status);
 305         }
 306
 307         /*
 308          * There has been a protection violation within the request. Fall
 309          * back to byte granularity port I/O and ignore the failing bytes.
 310          * This provides Windows compatibility.
 311          */
 312         for (i = 0; i < width; i += 8) {
 313
 314                 /* Validate and write one byte */
 315
 316                 if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
 317                         status =
 318                             acpi_os_write_port(address, (value >> i) & 0xFF, 8);
 319                         if (ACPI_FAILURE(status)) {
 320                                 return (status);
 321                         }
 322                 }
 323
 324                 address++;
 325         }
 326
 327         return (AE_OK);
 328 }