[deliverable/linux.git] / drivers / acpi / acpica / hwvalid.c


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

/*
 * Copyright (C) 2000 - 2009, 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.
 */
static const struct acpi_port_info acpi_protected_ports[] = {
	{"DMA1", 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},
	{"DMA1", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
	{"DMA2", 0x0089, 0x0089, ACPI_OSI_WIN_XP},
	{"DMA2", 0x008A, 0x008B, ACPI_OSI_WIN_XP},
	{"DMA2", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
	{"Arb", 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},
	{"DMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
	{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
	{"PCI", 0x0CF8, 0x0D00, 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)) {
		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: 0x%p/%X",
			    ACPI_CAST_PTR(void, address), byte_width));
		return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
	}

	/* 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_ERROR((AE_INFO,
					    "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:      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;

	status = acpi_hw_validate_io_request(address, width);
	if (ACPI_FAILURE(status)) {
		return status;
	}

	status = acpi_os_read_port(address, value, width);
	return status;
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_write_port
 *
 * PARAMETERS:  Address             Address of I/O port/register to write
 *              Value               Value to write
 *              Width               Number of bits
 *
 * RETURN:      None
 *
 * 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;

	status = acpi_hw_validate_io_request(address, width);
	if (ACPI_FAILURE(status)) {
		return status;
	}

	status = acpi_os_write_port(address, value, width);
	return status;
}
Commit	Line	Data
7f071903 BM	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	static const struct acpi_port_info acpi_protected_ports[] = {
68	{"DMA1", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
69	{"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
70	{"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
71	{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
72	{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
73	{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
74	{"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
75	{"DMA1", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
76	{"DMA2", 0x0089, 0x0089, ACPI_OSI_WIN_XP},
77	{"DMA2", 0x008A, 0x008B, ACPI_OSI_WIN_XP},
78	{"DMA2", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
79	{"Arb", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
80	{"Setup", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
81	{"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
82	{"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
83	{"DMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
84	{"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
85	{"PCI", 0x0CF8, 0x0D00, ACPI_OSI_WIN_XP}
86	};
87
88	#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (acpi_protected_ports)
89
90	/******************************************************************************
91	*
92	* FUNCTION: acpi_hw_validate_io_request
93	*
94	* PARAMETERS: Address Address of I/O port/register
95	* bit_width Number of bits (8,16,32)
96	*
97	* RETURN: Status
98	*
99	* DESCRIPTION: Validates an I/O request (address/length). Certain ports are
100	* always illegal and some ports are only illegal depending on
101	* the requests the BIOS AML code makes to the predefined
102	* _OSI method.
103	*
104	******************************************************************************/
105
106	static acpi_status
107	acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
108	{
109	u32 i;
110	u32 byte_width;
111	acpi_io_address last_address;
112	const struct acpi_port_info *port_info;
113
114	ACPI_FUNCTION_TRACE(hw_validate_io_request);
115
116	/* Supported widths are 8/16/32 */
117
118	if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
119	return AE_BAD_PARAMETER;
120	}
121
122	port_info = acpi_protected_ports;
123	byte_width = ACPI_DIV_8(bit_width);
124	last_address = address + byte_width - 1;
125
126	ACPI_DEBUG_PRINT((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
127	ACPI_CAST_PTR(void, address), ACPI_CAST_PTR(void,
128	last_address),
129	byte_width));
130
131	/* Maximum 16-bit address in I/O space */
132
133	if (last_address > ACPI_UINT16_MAX) {
134	ACPI_ERROR((AE_INFO,
135	"Illegal I/O port address/length above 64K: 0x%p/%X",
136	ACPI_CAST_PTR(void, address), byte_width));
137	return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
138	}
139
140	/* Exit if requested address is not within the protected port table */
141
142	if (address > acpi_protected_ports[ACPI_PORT_INFO_ENTRIES - 1].end) {
143	return_ACPI_STATUS(AE_OK);
144	}
145
146	/* Check request against the list of protected I/O ports */
147
148	for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, port_info++) {
149	/*
150	* Check if the requested address range will write to a reserved
151	* port. Four cases to consider:
152	*
153	* 1) Address range is contained completely in the port address range
154	* 2) Address range overlaps port range at the port range start
155	* 3) Address range overlaps port range at the port range end
156	* 4) Address range completely encompasses the port range
157	*/
158	if ((address <= port_info->end)
159	&& (last_address >= port_info->start)) {
160
161	/* Port illegality may depend on the _OSI calls made by the BIOS */
162
163	if (acpi_gbl_osi_data >= port_info->osi_dependency) {
164	ACPI_ERROR((AE_INFO,
165	"Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
166	ACPI_CAST_PTR(void, address),
167	byte_width, port_info->name,
168	port_info->start, port_info->end));
169
170	return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
171	}
172	}
173
174	/* Finished if address range ends before the end of this port */
175
176	if (last_address <= port_info->end) {
177	break;
178	}
179	}
180
181	return_ACPI_STATUS(AE_OK);
182	}
183
184	/******************************************************************************
185	*
186	* FUNCTION: acpi_hw_read_port
187	*
188	* PARAMETERS: Address Address of I/O port/register to read
189	* Value Where value is placed
190	* Width Number of bits
191	*
192	* RETURN: Value read from port
193	*
194	* DESCRIPTION: Read data from an I/O port or register. This is a front-end
195	* to acpi_os_read_port that performs validation on both the port
196	* address and the length.
197	*
198	*****************************************************************************/
199
200	acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
201	{
202	acpi_status status;
203
204	status = acpi_hw_validate_io_request(address, width);
205	if (ACPI_FAILURE(status)) {
206	return status;
207	}
208
209	status = acpi_os_read_port(address, value, width);
210	return status;
211	}
212
213	/******************************************************************************
214	*
215	* FUNCTION: acpi_hw_write_port
216	*
217	* PARAMETERS: Address Address of I/O port/register to write
218	* Value Value to write
219	* Width Number of bits
220	*
221	* RETURN: None
222	*
223	* DESCRIPTION: Write data to an I/O port or register. This is a front-end
224	* to acpi_os_write_port that performs validation on both the port
225	* address and the length.
226	*
227	*****************************************************************************/
228
229	acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
230	{
231	acpi_status status;
232
233	status = acpi_hw_validate_io_request(address, width);
234	if (ACPI_FAILURE(status)) {
235	return status;
236	}
237
238	status = acpi_os_write_port(address, value, width);
239	return status;
240	}