[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / hwvalid.c


/******************************************************************************
 *
 * Module Name: hwvalid - I/O request validation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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 (8259_a)
 *  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 %p LastAddress %p Length %X",
			  ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
								      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: %p/0x%X",
			    ACPI_CAST_PTR(void, 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%p/%X (%s 0x%.4X-0x%.4X)",
						  ACPI_CAST_PTR(void, 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;
}
Commit	Line	Data
7f071903 BM	1
	2	/******************************************************************************
	3	*
	4	* Module Name: hwvalid - I/O request validation
	5	*
	6	*****************************************************************************/
	7
	8	/*
77848130	9	* Copyright (C) 2000 - 2012, Intel Corp.
7f071903 BM	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.
ee6a0fbd BM	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
7f071903 BM	85	*/
7f071903 BM	86	static const struct acpi_port_info acpi_protected_ports[] = {
ee6a0fbd	87	{"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
7f071903 BM	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},
a38d75fa	93	{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
ee6a0fbd BM	94	{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
	95	{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
	96	{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
	97	{"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
	98	{"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
7f071903 BM	99	{"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
7f071903 BM	100	{"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
ee6a0fbd	101	{"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
7f071903	102	{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
f28ad2c3	103	{"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
7f071903 BM	104	};
	105
	106	#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (acpi_protected_ports)
	107
	108	/******************************************************************************
	109	*
	110	* FUNCTION: acpi_hw_validate_io_request
	111	*
	112	* PARAMETERS: Address Address of I/O port/register
	113	* bit_width Number of bits (8,16,32)
	114	*
	115	* RETURN: Status
	116	*
	117	* DESCRIPTION: Validates an I/O request (address/length). Certain ports are
	118	* always illegal and some ports are only illegal depending on
	119	* the requests the BIOS AML code makes to the predefined
	120	* _OSI method.
	121	*
	122	******************************************************************************/
	123
	124	static acpi_status
	125	acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
	126	{
	127	u32 i;
	128	u32 byte_width;
	129	acpi_io_address last_address;
	130	const struct acpi_port_info *port_info;
	131
	132	ACPI_FUNCTION_TRACE(hw_validate_io_request);
	133
	134	/* Supported widths are 8/16/32 */
	135
	136	if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
8519bc9f BM	137	ACPI_ERROR((AE_INFO,
8519bc9f BM	138	"Bad BitWidth parameter: %8.8X", bit_width));
7f071903 BM	139	return AE_BAD_PARAMETER;
	140	}
	141
	142	port_info = acpi_protected_ports;
	143	byte_width = ACPI_DIV_8(bit_width);
	144	last_address = address + byte_width - 1;
	145
	146	ACPI_DEBUG_PRINT((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
	147	ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
	148	last_address),
	149	byte_width));
	150
	151	/* Maximum 16-bit address in I/O space */
	152
	153	if (last_address > ACPI_UINT16_MAX) {
	154	ACPI_ERROR((AE_INFO,
f6a22b0b	155	"Illegal I/O port address/length above 64K: %p/0x%X",
7f071903	156	ACPI_CAST_PTR(void, address), byte_width));
a65131e9	157	return_ACPI_STATUS(AE_LIMIT);
7f071903 BM	158	}
	159
	160	/* Exit if requested address is not within the protected port table */
	161
	162	if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) {
	163	return_ACPI_STATUS(AE_OK);
	164	}
	165
	166	/* Check request against the list of protected I/O ports */
	167
	168	for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) {
	169	/*
	170	* Check if the requested address range will write to a reserved
	171	* port. Four cases to consider:
	172	*
	173	* 1) Address range is contained completely in the port address range
	174	* 2) Address range overlaps port range at the port range start
	175	* 3) Address range overlaps port range at the port range end
	176	* 4) Address range completely encompasses the port range
	177	*/
	178	if ((address <= port_info->end)
	179	&& (last_address >= port_info->start)) {
	180
	181	/* Port illegality may depend on the _OSI calls made by the BIOS */
	182
	183	if (acpi_gbl_osi_data >= port_info->osi_dependency) {
a65131e9 LM	184	ACPI_DEBUG_PRINT((ACPI_DB_IO,
	185	"Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
	186	ACPI_CAST_PTR(void, address),
	187	byte_width, port_info->name,
	188	port_info->start,
	189	port_info->end));
7f071903 BM	190
	191	return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
	192	}
	193	}
	194
	195	/* Finished if address range ends before the end of this port */
	196
	197	if (last_address <= port_info->end) {
	198	break;
	199	}
	200	}
	201
	202	return_ACPI_STATUS(AE_OK);
	203	}
	204
	205	/******************************************************************************
	206	*
	207	* FUNCTION: acpi_hw_read_port
	208	*
	209	* PARAMETERS: Address Address of I/O port/register to read
	210	* Value Where value is placed
	211	* Width Number of bits
	212	*
a65131e9	213	* RETURN: Status and value read from port
7f071903 BM	214	*
	215	* DESCRIPTION: Read data from an I/O port or register. This is a front-end
	216	* to acpi_os_read_port that performs validation on both the port
	217	* address and the length.
	218	*
	219	*****************************************************************************/
	220
	221	acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
	222	{
	223	acpi_status status;
a65131e9 LM	224	u32 one_byte;
	225	u32 i;
	226
b681f7d9 MG	227	/* Truncate address to 16 bits if requested */
	228
	229	if (acpi_gbl_truncate_io_addresses) {
	230	address &= ACPI_UINT16_MAX;
	231	}
	232
a65131e9	233	/* Validate the entire request and perform the I/O */
7f071903 BM	234
7f071903 BM	235	status = acpi_hw_validate_io_request(address, width);
a65131e9 LM	236	if (ACPI_SUCCESS(status)) {
a65131e9 LM	237	status = acpi_os_read_port(address, value, width);
7f071903 BM	238	return status;
	239	}
	240
a65131e9 LM	241	if (status != AE_AML_ILLEGAL_ADDRESS) {
	242	return status;
	243	}
	244
	245	/*
	246	* There has been a protection violation within the request. Fall
	247	* back to byte granularity port I/O and ignore the failing bytes.
	248	* This provides Windows compatibility.
	249	*/
	250	for (i = 0, *value = 0; i < width; i += 8) {
	251
	252	/* Validate and read one byte */
	253
	254	if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
	255	status = acpi_os_read_port(address, &one_byte, 8);
	256	if (ACPI_FAILURE(status)) {
	257	return status;
	258	}
	259
	260	*value \|= (one_byte << i);
	261	}
	262
	263	address++;
	264	}
	265
	266	return AE_OK;
7f071903 BM	267	}
	268
	269	/******************************************************************************
	270	*
	271	* FUNCTION: acpi_hw_write_port
	272	*
	273	* PARAMETERS: Address Address of I/O port/register to write
	274	* Value Value to write
	275	* Width Number of bits
	276	*
a65131e9	277	* RETURN: Status
7f071903 BM	278	*
	279	* DESCRIPTION: Write data to an I/O port or register. This is a front-end
	280	* to acpi_os_write_port that performs validation on both the port
	281	* address and the length.
	282	*
	283	*****************************************************************************/
	284
	285	acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
	286	{
	287	acpi_status status;
a65131e9 LM	288	u32 i;
a65131e9 LM	289
b681f7d9 MG	290	/* Truncate address to 16 bits if requested */
	291
	292	if (acpi_gbl_truncate_io_addresses) {
	293	address &= ACPI_UINT16_MAX;
	294	}
	295
a65131e9	296	/* Validate the entire request and perform the I/O */
7f071903 BM	297
7f071903 BM	298	status = acpi_hw_validate_io_request(address, width);
a65131e9 LM	299	if (ACPI_SUCCESS(status)) {
a65131e9 LM	300	status = acpi_os_write_port(address, value, width);
7f071903 BM	301	return status;
	302	}
	303
a65131e9 LM	304	if (status != AE_AML_ILLEGAL_ADDRESS) {
	305	return status;
	306	}
	307
	308	/*
	309	* There has been a protection violation within the request. Fall
	310	* back to byte granularity port I/O and ignore the failing bytes.
	311	* This provides Windows compatibility.
	312	*/
	313	for (i = 0; i < width; i += 8) {
	314
	315	/* Validate and write one byte */
	316
	317	if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
	318	status =
	319	acpi_os_write_port(address, (value >> i) & 0xFF, 8);
	320	if (ACPI_FAILURE(status)) {
	321	return status;
	322	}
	323	}
	324
	325	address++;
	326	}
	327
	328	return AE_OK;
7f071903	329	}