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/****************************************************************************** |
* |
* Module Name: hwvalid - I/O request validation |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, 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 (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 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}, |
{"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 (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)) { |
ACPI_ERROR((AE_INFO, |
"Bad BitWidth parameter: %8.8X", bit_width)); |
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 %8.8X%8.8X LastAddress %8.8X%8.8X Length %X", |
ACPI_FORMAT_UINT64(address), |
ACPI_FORMAT_UINT64(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: %8.8X%8.8X/0x%X", |
ACPI_FORMAT_UINT64(address), byte_width)); |
return_ACPI_STATUS(AE_LIMIT); |
} |
|
/* 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_DEBUG_PRINT((ACPI_DB_IO, |
"Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)", |
ACPI_FORMAT_UINT64(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: Status and 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; |
u32 one_byte; |
u32 i; |
|
/* Truncate address to 16 bits if requested */ |
|
if (acpi_gbl_truncate_io_addresses) { |
address &= ACPI_UINT16_MAX; |
} |
|
/* Validate the entire request and perform the I/O */ |
|
status = acpi_hw_validate_io_request(address, width); |
if (ACPI_SUCCESS(status)) { |
status = acpi_os_read_port(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 (acpi_hw_validate_io_request(address, 8) == AE_OK) { |
status = acpi_os_read_port(address, &one_byte, 8); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
*value |= (one_byte << i); |
} |
|
address++; |
} |
|
return (AE_OK); |
} |
|
/****************************************************************************** |
* |
* FUNCTION: acpi_hw_write_port |
* |
* 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 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; |
u32 i; |
|
/* Truncate address to 16 bits if requested */ |
|
if (acpi_gbl_truncate_io_addresses) { |
address &= ACPI_UINT16_MAX; |
} |
|
/* Validate the entire request and perform the I/O */ |
|
status = acpi_hw_validate_io_request(address, width); |
if (ACPI_SUCCESS(status)) { |
status = acpi_os_write_port(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 (acpi_hw_validate_io_request(address, 8) == AE_OK) { |
status = |
acpi_os_write_port(address, (value >> i) & 0xFF, 8); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
} |
|
address++; |
} |
|
return (AE_OK); |
} |