summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/hwvalid.c
blob: 915b26448d2c9114bba6a1155b5e53f78ab89d31 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: hwvalid - I/O request validation
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

#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_ACPI_STATUS(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. There are 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_VALUES,
						  "Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)\n",
						  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 (data) is returned
 *              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 compatibility with other ACPI implementations.
	 */
	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 compatibility with other ACPI implementations.
	 */
	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);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_hw_validate_io_block
 *
 * PARAMETERS:  Address             Address of I/O port/register blobk
 *              bit_width           Number of bits (8,16,32) in each register
 *              count               Number of registers in the block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Validates a block of I/O ports/registers.
 *
 ******************************************************************************/

acpi_status acpi_hw_validate_io_block(u64 address, u32 bit_width, u32 count)
{
	acpi_status status;

	while (count--) {
		status = acpi_hw_validate_io_request((acpi_io_address)address,
						     bit_width);
		if (ACPI_FAILURE(status))
			return_ACPI_STATUS(status);

		address += ACPI_DIV_8(bit_width);
	}

	return_ACPI_STATUS(AE_OK);
}