1 /****************************************************************************** 2 * 3 * Module Name: hwvalid - I/O request validation 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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.h" 45 #include "accommon.h" 46 47 #define _COMPONENT ACPI_HARDWARE 48 ACPI_MODULE_NAME ("hwvalid") 49 50 /* Local prototypes */ 51 52 static ACPI_STATUS 53 AcpiHwValidateIoRequest ( 54 ACPI_IO_ADDRESS Address, 55 UINT32 BitWidth); 56 57 58 /* 59 * Protected I/O ports. Some ports are always illegal, and some are 60 * conditionally illegal. This table must remain ordered by port address. 61 * 62 * The table is used to implement the Microsoft port access rules that 63 * first appeared in Windows XP. Some ports are always illegal, and some 64 * ports are only illegal if the BIOS calls _OSI with a WinXP string or 65 * later (meaning that the BIOS itelf is post-XP.) 66 * 67 * This provides ACPICA with the desired port protections and 68 * Microsoft compatibility. 69 * 70 * Description of port entries: 71 * DMA: DMA controller 72 * PIC0: Programmable Interrupt Controller (8259A) 73 * PIT1: System Timer 1 74 * PIT2: System Timer 2 failsafe 75 * RTC: Real-time clock 76 * CMOS: Extended CMOS 77 * DMA1: DMA 1 page registers 78 * DMA1L: DMA 1 Ch 0 low page 79 * DMA2: DMA 2 page registers 80 * DMA2L: DMA 2 low page refresh 81 * ARBC: Arbitration control 82 * SETUP: Reserved system board setup 83 * POS: POS channel select 84 * PIC1: Cascaded PIC 85 * IDMA: ISA DMA 86 * ELCR: PIC edge/level registers 87 * PCI: PCI configuration space 88 */ 89 static const ACPI_PORT_INFO AcpiProtectedPorts[] = 90 { 91 {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP}, 92 {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL}, 93 {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP}, 94 {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP}, 95 {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP}, 96 {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP}, 97 {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP}, 98 {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP}, 99 {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP}, 100 {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP}, 101 {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP}, 102 {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP}, 103 {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP}, 104 {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL}, 105 {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP}, 106 {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL}, 107 {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP} 108 }; 109 110 #define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts) 111 112 113 /****************************************************************************** 114 * 115 * FUNCTION: AcpiHwValidateIoRequest 116 * 117 * PARAMETERS: Address Address of I/O port/register 118 * BitWidth Number of bits (8,16,32) 119 * 120 * RETURN: Status 121 * 122 * DESCRIPTION: Validates an I/O request (address/length). Certain ports are 123 * always illegal and some ports are only illegal depending on 124 * the requests the BIOS AML code makes to the predefined 125 * _OSI method. 126 * 127 ******************************************************************************/ 128 129 static ACPI_STATUS 130 AcpiHwValidateIoRequest ( 131 ACPI_IO_ADDRESS Address, 132 UINT32 BitWidth) 133 { 134 UINT32 i; 135 UINT32 ByteWidth; 136 ACPI_IO_ADDRESS LastAddress; 137 const ACPI_PORT_INFO *PortInfo; 138 139 140 ACPI_FUNCTION_TRACE (HwValidateIoRequest); 141 142 143 /* Supported widths are 8/16/32 */ 144 145 if ((BitWidth != 8) && 146 (BitWidth != 16) && 147 (BitWidth != 32)) 148 { 149 ACPI_ERROR ((AE_INFO, 150 "Bad BitWidth parameter: %8.8X", BitWidth)); 151 return (AE_BAD_PARAMETER); 152 } 153 154 PortInfo = AcpiProtectedPorts; 155 ByteWidth = ACPI_DIV_8 (BitWidth); 156 LastAddress = Address + ByteWidth - 1; 157 158 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %8.8X%8.8X LastAddress %8.8X%8.8X Length %X", 159 ACPI_FORMAT_UINT64 (Address), ACPI_FORMAT_UINT64 (LastAddress), 160 ByteWidth)); 161 162 /* Maximum 16-bit address in I/O space */ 163 164 if (LastAddress > ACPI_UINT16_MAX) 165 { 166 ACPI_ERROR ((AE_INFO, 167 "Illegal I/O port address/length above 64K: %8.8X%8.8X/0x%X", 168 ACPI_FORMAT_UINT64 (Address), ByteWidth)); 169 return_ACPI_STATUS (AE_LIMIT); 170 } 171 172 /* Exit if requested address is not within the protected port table */ 173 174 if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End) 175 { 176 return_ACPI_STATUS (AE_OK); 177 } 178 179 /* Check request against the list of protected I/O ports */ 180 181 for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++) 182 { 183 /* 184 * Check if the requested address range will write to a reserved 185 * port. Four cases to consider: 186 * 187 * 1) Address range is contained completely in the port address range 188 * 2) Address range overlaps port range at the port range start 189 * 3) Address range overlaps port range at the port range end 190 * 4) Address range completely encompasses the port range 191 */ 192 if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start)) 193 { 194 /* Port illegality may depend on the _OSI calls made by the BIOS */ 195 196 if (AcpiGbl_OsiData >= PortInfo->OsiDependency) 197 { 198 ACPI_DEBUG_PRINT ((ACPI_DB_IO, 199 "Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)", 200 ACPI_FORMAT_UINT64 (Address), ByteWidth, PortInfo->Name, 201 PortInfo->Start, PortInfo->End)); 202 203 return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS); 204 } 205 } 206 207 /* Finished if address range ends before the end of this port */ 208 209 if (LastAddress <= PortInfo->End) 210 { 211 break; 212 } 213 } 214 215 return_ACPI_STATUS (AE_OK); 216 } 217 218 219 /****************************************************************************** 220 * 221 * FUNCTION: AcpiHwReadPort 222 * 223 * PARAMETERS: Address Address of I/O port/register to read 224 * Value Where value is placed 225 * Width Number of bits 226 * 227 * RETURN: Status and value read from port 228 * 229 * DESCRIPTION: Read data from an I/O port or register. This is a front-end 230 * to AcpiOsReadPort that performs validation on both the port 231 * address and the length. 232 * 233 *****************************************************************************/ 234 235 ACPI_STATUS 236 AcpiHwReadPort ( 237 ACPI_IO_ADDRESS Address, 238 UINT32 *Value, 239 UINT32 Width) 240 { 241 ACPI_STATUS Status; 242 UINT32 OneByte; 243 UINT32 i; 244 245 246 /* Truncate address to 16 bits if requested */ 247 248 if (AcpiGbl_TruncateIoAddresses) 249 { 250 Address &= ACPI_UINT16_MAX; 251 } 252 253 /* Validate the entire request and perform the I/O */ 254 255 Status = AcpiHwValidateIoRequest (Address, Width); 256 if (ACPI_SUCCESS (Status)) 257 { 258 Status = AcpiOsReadPort (Address, Value, Width); 259 return (Status); 260 } 261 262 if (Status != AE_AML_ILLEGAL_ADDRESS) 263 { 264 return (Status); 265 } 266 267 /* 268 * There has been a protection violation within the request. Fall 269 * back to byte granularity port I/O and ignore the failing bytes. 270 * This provides Windows compatibility. 271 */ 272 for (i = 0, *Value = 0; i < Width; i += 8) 273 { 274 /* Validate and read one byte */ 275 276 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK) 277 { 278 Status = AcpiOsReadPort (Address, &OneByte, 8); 279 if (ACPI_FAILURE (Status)) 280 { 281 return (Status); 282 } 283 284 *Value |= (OneByte << i); 285 } 286 287 Address++; 288 } 289 290 return (AE_OK); 291 } 292 293 294 /****************************************************************************** 295 * 296 * FUNCTION: AcpiHwWritePort 297 * 298 * PARAMETERS: Address Address of I/O port/register to write 299 * Value Value to write 300 * Width Number of bits 301 * 302 * RETURN: Status 303 * 304 * DESCRIPTION: Write data to an I/O port or register. This is a front-end 305 * to AcpiOsWritePort that performs validation on both the port 306 * address and the length. 307 * 308 *****************************************************************************/ 309 310 ACPI_STATUS 311 AcpiHwWritePort ( 312 ACPI_IO_ADDRESS Address, 313 UINT32 Value, 314 UINT32 Width) 315 { 316 ACPI_STATUS Status; 317 UINT32 i; 318 319 320 /* Truncate address to 16 bits if requested */ 321 322 if (AcpiGbl_TruncateIoAddresses) 323 { 324 Address &= ACPI_UINT16_MAX; 325 } 326 327 /* Validate the entire request and perform the I/O */ 328 329 Status = AcpiHwValidateIoRequest (Address, Width); 330 if (ACPI_SUCCESS (Status)) 331 { 332 Status = AcpiOsWritePort (Address, Value, Width); 333 return (Status); 334 } 335 336 if (Status != AE_AML_ILLEGAL_ADDRESS) 337 { 338 return (Status); 339 } 340 341 /* 342 * There has been a protection violation within the request. Fall 343 * back to byte granularity port I/O and ignore the failing bytes. 344 * This provides Windows compatibility. 345 */ 346 for (i = 0; i < Width; i += 8) 347 { 348 /* Validate and write one byte */ 349 350 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK) 351 { 352 Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8); 353 if (ACPI_FAILURE (Status)) 354 { 355 return (Status); 356 } 357 } 358 359 Address++; 360 } 361 362 return (AE_OK); 363 } 364