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#define __HWVALID_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49
50#define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME ("hwvalid")
52
53/* Local prototypes */
54
55static ACPI_STATUS
56AcpiHwValidateIoRequest (
57 ACPI_IO_ADDRESS Address,
58 UINT32 BitWidth);
59
60
61/*
62 * Protected I/O ports. Some ports are always illegal, and some are
63 * conditionally illegal. This table must remain ordered by port address.
64 *
65 * The table is used to implement the Microsoft port access rules that
66 * first appeared in Windows XP. Some ports are always illegal, and some
67 * ports are only illegal if the BIOS calls _OSI with a WinXP string or
68 * later (meaning that the BIOS itelf is post-XP.)
69 *
70 * This provides ACPICA with the desired port protections and
71 * Microsoft compatibility.
72 *
73 * Description of port entries:
74 * DMA: DMA controller
75 * PIC0: Programmable Interrupt Controller (8259A)
76 * PIT1: System Timer 1
77 * PIT2: System Timer 2 failsafe
78 * RTC: Real-time clock
79 * CMOS: Extended CMOS
80 * DMA1: DMA 1 page registers
81 * DMA1L: DMA 1 Ch 0 low page
82 * DMA2: DMA 2 page registers
83 * DMA2L: DMA 2 low page refresh
84 * ARBC: Arbitration control
85 * SETUP: Reserved system board setup
86 * POS: POS channel select
87 * PIC1: Cascaded PIC
88 * IDMA: ISA DMA
89 * ELCR: PIC edge/level registers
90 * PCI: PCI configuration space
91 */
92static const ACPI_PORT_INFO AcpiProtectedPorts[] =
93{
94 {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
95 {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
96 {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
97 {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
98 {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
99 {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
100 {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
101 {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
102 {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
103 {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
104 {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
105 {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
106 {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
107 {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
108 {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
109 {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
110 {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
111};
112
113#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts)
114
115
116/******************************************************************************
117 *
118 * FUNCTION: AcpiHwValidateIoRequest
119 *
120 * PARAMETERS: Address Address of I/O port/register
121 * BitWidth Number of bits (8,16,32)
122 *
123 * RETURN: Status
124 *
125 * DESCRIPTION: Validates an I/O request (address/length). Certain ports are
126 * always illegal and some ports are only illegal depending on
127 * the requests the BIOS AML code makes to the predefined
128 * _OSI method.
129 *
130 ******************************************************************************/
131
132static ACPI_STATUS
133AcpiHwValidateIoRequest (
134 ACPI_IO_ADDRESS Address,
135 UINT32 BitWidth)
136{
137 UINT32 i;
138 UINT32 ByteWidth;
139 ACPI_IO_ADDRESS LastAddress;
140 const ACPI_PORT_INFO *PortInfo;
141
142
143 ACPI_FUNCTION_TRACE (HwValidateIoRequest);
144
145
146 /* Supported widths are 8/16/32 */
147
148 if ((BitWidth != 8) &&
149 (BitWidth != 16) &&
150 (BitWidth != 32))
151 {
152 ACPI_ERROR ((AE_INFO,
153 "Bad BitWidth parameter: %8.8X", BitWidth));
154 return (AE_BAD_PARAMETER);
155 }
156
157 PortInfo = AcpiProtectedPorts;
158 ByteWidth = ACPI_DIV_8 (BitWidth);
159 LastAddress = Address + ByteWidth - 1;
160
161 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
162 ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),
163 ByteWidth));
164
165 /* Maximum 16-bit address in I/O space */
166
167 if (LastAddress > ACPI_UINT16_MAX)
168 {
169 ACPI_ERROR ((AE_INFO,
170 "Illegal I/O port address/length above 64K: %p/0x%X",
171 ACPI_CAST_PTR (void, Address), ByteWidth));
172 return_ACPI_STATUS (AE_LIMIT);
173 }
174
175 /* Exit if requested address is not within the protected port table */
176
177 if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End)
178 {
179 return_ACPI_STATUS (AE_OK);
180 }
181
182 /* Check request against the list of protected I/O ports */
183
184 for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++)
185 {
186 /*
187 * Check if the requested address range will write to a reserved
188 * port. Four cases to consider:
189 *
190 * 1) Address range is contained completely in the port address range
191 * 2) Address range overlaps port range at the port range start
192 * 3) Address range overlaps port range at the port range end
193 * 4) Address range completely encompasses the port range
194 */
195 if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))
196 {
197 /* Port illegality may depend on the _OSI calls made by the BIOS */
198
199 if (AcpiGbl_OsiData >= PortInfo->OsiDependency)
200 {
201 ACPI_DEBUG_PRINT ((ACPI_DB_IO,
202 "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
203 ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,
204 PortInfo->Start, PortInfo->End));
205
206 return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS);
207 }
208 }
209
210 /* Finished if address range ends before the end of this port */
211
212 if (LastAddress <= PortInfo->End)
213 {
214 break;
215 }
216 }
217
218 return_ACPI_STATUS (AE_OK);
219}
220
221
222/******************************************************************************
223 *
224 * FUNCTION: AcpiHwReadPort
225 *
226 * PARAMETERS: Address Address of I/O port/register to read
227 * Value Where value is placed
228 * Width Number of bits
229 *
230 * RETURN: Status and value read from port
231 *
232 * DESCRIPTION: Read data from an I/O port or register. This is a front-end
233 * to AcpiOsReadPort that performs validation on both the port
234 * address and the length.
235 *
236 *****************************************************************************/
237
238ACPI_STATUS
239AcpiHwReadPort (
240 ACPI_IO_ADDRESS Address,
241 UINT32 *Value,
242 UINT32 Width)
243{
244 ACPI_STATUS Status;
245 UINT32 OneByte;
246 UINT32 i;
247
248
249 /* Truncate address to 16 bits if requested */
250
251 if (AcpiGbl_TruncateIoAddresses)
252 {
253 Address &= ACPI_UINT16_MAX;
254 }
255
256 /* Validate the entire request and perform the I/O */
257
258 Status = AcpiHwValidateIoRequest (Address, Width);
259 if (ACPI_SUCCESS (Status))
260 {
261 Status = AcpiOsReadPort (Address, Value, Width);
262 return (Status);
263 }
264
265 if (Status != AE_AML_ILLEGAL_ADDRESS)
266 {
267 return (Status);
268 }
269
270 /*
271 * There has been a protection violation within the request. Fall
272 * back to byte granularity port I/O and ignore the failing bytes.
273 * This provides Windows compatibility.
274 */
275 for (i = 0, *Value = 0; i < Width; i += 8)
276 {
277 /* Validate and read one byte */
278
279 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
280 {
281 Status = AcpiOsReadPort (Address, &OneByte, 8);
282 if (ACPI_FAILURE (Status))
283 {
284 return (Status);
285 }
286
287 *Value |= (OneByte << i);
288 }
289
290 Address++;
291 }
292
293 return (AE_OK);
294}
295
296
297/******************************************************************************
298 *
299 * FUNCTION: AcpiHwWritePort
300 *
301 * PARAMETERS: Address Address of I/O port/register to write
302 * Value Value to write
303 * Width Number of bits
304 *
305 * RETURN: Status
306 *
307 * DESCRIPTION: Write data to an I/O port or register. This is a front-end
308 * to AcpiOsWritePort that performs validation on both the port
309 * address and the length.
310 *
311 *****************************************************************************/
312
313ACPI_STATUS
314AcpiHwWritePort (
315 ACPI_IO_ADDRESS Address,
316 UINT32 Value,
317 UINT32 Width)
318{
319 ACPI_STATUS Status;
320 UINT32 i;
321
322
323 /* Truncate address to 16 bits if requested */
324
325 if (AcpiGbl_TruncateIoAddresses)
326 {
327 Address &= ACPI_UINT16_MAX;
328 }
329
330 /* Validate the entire request and perform the I/O */
331
332 Status = AcpiHwValidateIoRequest (Address, Width);
333 if (ACPI_SUCCESS (Status))
334 {
335 Status = AcpiOsWritePort (Address, Value, Width);
336 return (Status);
337 }
338
339 if (Status != AE_AML_ILLEGAL_ADDRESS)
340 {
341 return (Status);
342 }
343
344 /*
345 * There has been a protection violation within the request. Fall
346 * back to byte granularity port I/O and ignore the failing bytes.
347 * This provides Windows compatibility.
348 */
349 for (i = 0; i < Width; i += 8)
350 {
351 /* Validate and write one byte */
352
353 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
354 {
355 Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);
356 if (ACPI_FAILURE (Status))
357 {
358 return (Status);
359 }
360 }
361
362 Address++;
363 }
364
365 return (AE_OK);
366}
367
368
| 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#define __HWVALID_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49
50#define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME ("hwvalid")
52
53/* Local prototypes */
54
55static ACPI_STATUS
56AcpiHwValidateIoRequest (
57 ACPI_IO_ADDRESS Address,
58 UINT32 BitWidth);
59
60
61/*
62 * Protected I/O ports. Some ports are always illegal, and some are
63 * conditionally illegal. This table must remain ordered by port address.
64 *
65 * The table is used to implement the Microsoft port access rules that
66 * first appeared in Windows XP. Some ports are always illegal, and some
67 * ports are only illegal if the BIOS calls _OSI with a WinXP string or
68 * later (meaning that the BIOS itelf is post-XP.)
69 *
70 * This provides ACPICA with the desired port protections and
71 * Microsoft compatibility.
72 *
73 * Description of port entries:
74 * DMA: DMA controller
75 * PIC0: Programmable Interrupt Controller (8259A)
76 * PIT1: System Timer 1
77 * PIT2: System Timer 2 failsafe
78 * RTC: Real-time clock
79 * CMOS: Extended CMOS
80 * DMA1: DMA 1 page registers
81 * DMA1L: DMA 1 Ch 0 low page
82 * DMA2: DMA 2 page registers
83 * DMA2L: DMA 2 low page refresh
84 * ARBC: Arbitration control
85 * SETUP: Reserved system board setup
86 * POS: POS channel select
87 * PIC1: Cascaded PIC
88 * IDMA: ISA DMA
89 * ELCR: PIC edge/level registers
90 * PCI: PCI configuration space
91 */
92static const ACPI_PORT_INFO AcpiProtectedPorts[] =
93{
94 {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
95 {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
96 {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
97 {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
98 {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
99 {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
100 {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
101 {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
102 {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
103 {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
104 {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
105 {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
106 {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
107 {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
108 {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
109 {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
110 {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
111};
112
113#define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts)
114
115
116/******************************************************************************
117 *
118 * FUNCTION: AcpiHwValidateIoRequest
119 *
120 * PARAMETERS: Address Address of I/O port/register
121 * BitWidth Number of bits (8,16,32)
122 *
123 * RETURN: Status
124 *
125 * DESCRIPTION: Validates an I/O request (address/length). Certain ports are
126 * always illegal and some ports are only illegal depending on
127 * the requests the BIOS AML code makes to the predefined
128 * _OSI method.
129 *
130 ******************************************************************************/
131
132static ACPI_STATUS
133AcpiHwValidateIoRequest (
134 ACPI_IO_ADDRESS Address,
135 UINT32 BitWidth)
136{
137 UINT32 i;
138 UINT32 ByteWidth;
139 ACPI_IO_ADDRESS LastAddress;
140 const ACPI_PORT_INFO *PortInfo;
141
142
143 ACPI_FUNCTION_TRACE (HwValidateIoRequest);
144
145
146 /* Supported widths are 8/16/32 */
147
148 if ((BitWidth != 8) &&
149 (BitWidth != 16) &&
150 (BitWidth != 32))
151 {
152 ACPI_ERROR ((AE_INFO,
153 "Bad BitWidth parameter: %8.8X", BitWidth));
154 return (AE_BAD_PARAMETER);
155 }
156
157 PortInfo = AcpiProtectedPorts;
158 ByteWidth = ACPI_DIV_8 (BitWidth);
159 LastAddress = Address + ByteWidth - 1;
160
161 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
162 ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),
163 ByteWidth));
164
165 /* Maximum 16-bit address in I/O space */
166
167 if (LastAddress > ACPI_UINT16_MAX)
168 {
169 ACPI_ERROR ((AE_INFO,
170 "Illegal I/O port address/length above 64K: %p/0x%X",
171 ACPI_CAST_PTR (void, Address), ByteWidth));
172 return_ACPI_STATUS (AE_LIMIT);
173 }
174
175 /* Exit if requested address is not within the protected port table */
176
177 if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End)
178 {
179 return_ACPI_STATUS (AE_OK);
180 }
181
182 /* Check request against the list of protected I/O ports */
183
184 for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++)
185 {
186 /*
187 * Check if the requested address range will write to a reserved
188 * port. Four cases to consider:
189 *
190 * 1) Address range is contained completely in the port address range
191 * 2) Address range overlaps port range at the port range start
192 * 3) Address range overlaps port range at the port range end
193 * 4) Address range completely encompasses the port range
194 */
195 if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))
196 {
197 /* Port illegality may depend on the _OSI calls made by the BIOS */
198
199 if (AcpiGbl_OsiData >= PortInfo->OsiDependency)
200 {
201 ACPI_DEBUG_PRINT ((ACPI_DB_IO,
202 "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
203 ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,
204 PortInfo->Start, PortInfo->End));
205
206 return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS);
207 }
208 }
209
210 /* Finished if address range ends before the end of this port */
211
212 if (LastAddress <= PortInfo->End)
213 {
214 break;
215 }
216 }
217
218 return_ACPI_STATUS (AE_OK);
219}
220
221
222/******************************************************************************
223 *
224 * FUNCTION: AcpiHwReadPort
225 *
226 * PARAMETERS: Address Address of I/O port/register to read
227 * Value Where value is placed
228 * Width Number of bits
229 *
230 * RETURN: Status and value read from port
231 *
232 * DESCRIPTION: Read data from an I/O port or register. This is a front-end
233 * to AcpiOsReadPort that performs validation on both the port
234 * address and the length.
235 *
236 *****************************************************************************/
237
238ACPI_STATUS
239AcpiHwReadPort (
240 ACPI_IO_ADDRESS Address,
241 UINT32 *Value,
242 UINT32 Width)
243{
244 ACPI_STATUS Status;
245 UINT32 OneByte;
246 UINT32 i;
247
248
249 /* Truncate address to 16 bits if requested */
250
251 if (AcpiGbl_TruncateIoAddresses)
252 {
253 Address &= ACPI_UINT16_MAX;
254 }
255
256 /* Validate the entire request and perform the I/O */
257
258 Status = AcpiHwValidateIoRequest (Address, Width);
259 if (ACPI_SUCCESS (Status))
260 {
261 Status = AcpiOsReadPort (Address, Value, Width);
262 return (Status);
263 }
264
265 if (Status != AE_AML_ILLEGAL_ADDRESS)
266 {
267 return (Status);
268 }
269
270 /*
271 * There has been a protection violation within the request. Fall
272 * back to byte granularity port I/O and ignore the failing bytes.
273 * This provides Windows compatibility.
274 */
275 for (i = 0, *Value = 0; i < Width; i += 8)
276 {
277 /* Validate and read one byte */
278
279 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
280 {
281 Status = AcpiOsReadPort (Address, &OneByte, 8);
282 if (ACPI_FAILURE (Status))
283 {
284 return (Status);
285 }
286
287 *Value |= (OneByte << i);
288 }
289
290 Address++;
291 }
292
293 return (AE_OK);
294}
295
296
297/******************************************************************************
298 *
299 * FUNCTION: AcpiHwWritePort
300 *
301 * PARAMETERS: Address Address of I/O port/register to write
302 * Value Value to write
303 * Width Number of bits
304 *
305 * RETURN: Status
306 *
307 * DESCRIPTION: Write data to an I/O port or register. This is a front-end
308 * to AcpiOsWritePort that performs validation on both the port
309 * address and the length.
310 *
311 *****************************************************************************/
312
313ACPI_STATUS
314AcpiHwWritePort (
315 ACPI_IO_ADDRESS Address,
316 UINT32 Value,
317 UINT32 Width)
318{
319 ACPI_STATUS Status;
320 UINT32 i;
321
322
323 /* Truncate address to 16 bits if requested */
324
325 if (AcpiGbl_TruncateIoAddresses)
326 {
327 Address &= ACPI_UINT16_MAX;
328 }
329
330 /* Validate the entire request and perform the I/O */
331
332 Status = AcpiHwValidateIoRequest (Address, Width);
333 if (ACPI_SUCCESS (Status))
334 {
335 Status = AcpiOsWritePort (Address, Value, Width);
336 return (Status);
337 }
338
339 if (Status != AE_AML_ILLEGAL_ADDRESS)
340 {
341 return (Status);
342 }
343
344 /*
345 * There has been a protection violation within the request. Fall
346 * back to byte granularity port I/O and ignore the failing bytes.
347 * This provides Windows compatibility.
348 */
349 for (i = 0; i < Width; i += 8)
350 {
351 /* Validate and write one byte */
352
353 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
354 {
355 Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);
356 if (ACPI_FAILURE (Status))
357 {
358 return (Status);
359 }
360 }
361
362 Address++;
363 }
364
365 return (AE_OK);
366}
367
368
|