1
2/******************************************************************************
3 *
4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
| 1
2/******************************************************************************
3 *
4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
|
5 * $Revision: 46 $
| 5 * $Revision: 47 $
|
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government. In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
117
118#define __HWACPI_C__
119
120#include "acpi.h"
121#include "achware.h"
122
123
124#define _COMPONENT ACPI_HARDWARE
125 MODULE_NAME ("hwacpi")
126
127
128/******************************************************************************
129 *
130 * FUNCTION: AcpiHwInitialize
131 *
132 * PARAMETERS: None
133 *
134 * RETURN: Status
135 *
136 * DESCRIPTION: Initialize and validate various ACPI registers
137 *
138 ******************************************************************************/
139
140ACPI_STATUS
141AcpiHwInitialize (
142 void)
143{
144 ACPI_STATUS Status = AE_OK;
145 UINT32 Index;
146
147
148 FUNCTION_TRACE ("HwInitialize");
149
150
151 /* We must have the ACPI tables by the time we get here */
152
153 if (!AcpiGbl_FADT)
154 {
155 AcpiGbl_RestoreAcpiChipset = FALSE;
156
157 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No FADT!\n"));
158
159 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
160 }
| 6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government. In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
117
118#define __HWACPI_C__
119
120#include "acpi.h"
121#include "achware.h"
122
123
124#define _COMPONENT ACPI_HARDWARE
125 MODULE_NAME ("hwacpi")
126
127
128/******************************************************************************
129 *
130 * FUNCTION: AcpiHwInitialize
131 *
132 * PARAMETERS: None
133 *
134 * RETURN: Status
135 *
136 * DESCRIPTION: Initialize and validate various ACPI registers
137 *
138 ******************************************************************************/
139
140ACPI_STATUS
141AcpiHwInitialize (
142 void)
143{
144 ACPI_STATUS Status = AE_OK;
145 UINT32 Index;
146
147
148 FUNCTION_TRACE ("HwInitialize");
149
150
151 /* We must have the ACPI tables by the time we get here */
152
153 if (!AcpiGbl_FADT)
154 {
155 AcpiGbl_RestoreAcpiChipset = FALSE;
156
157 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No FADT!\n"));
158
159 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
160 }
|
| 161
162 /*
163 * Save the initial state of the ACPI event enable registers, so
164 * we can restore them when we exit. We probably won't exit, though.
165 *
166 * The location of the PM1aEvtBlk enable registers is defined as the
167 * base of PM1aEvtBlk + DIV_2(PM1aEvtBlkLength). Since the spec further
168 * fully defines the PM1aEvtBlk to be a total of 4 bytes, the offset
169 * for the enable registers is always 2 from the base. It is hard
170 * coded here. If this changes in the spec, this code will need to
171 * be modified. The PM1bEvtBlk behaves as expected.
172 */
173 AcpiGbl_Pm1EnableRegisterSave = (UINT16) AcpiHwRegisterRead (
174 ACPI_MTX_LOCK, PM1_EN);
|
161
| 175
|
162 /* Identify current ACPI/legacy mode */
| |
163
| 176
|
164 switch (AcpiGbl_SystemFlags & SYS_MODES_MASK)
| 177 /*
178 * The GPEs behave similarly, except that the length of the register
179 * block is not fixed, so the buffer must be allocated with malloc
180 */
181 if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe0Blk.Address) &&
182 AcpiGbl_FADT->Gpe0BlkLen)
|
165 {
| 183 {
|
166 case (SYS_MODE_ACPI):
| 184 /* GPE0 specified in FADT */
|
167
| 185
|
168 AcpiGbl_OriginalMode = SYS_MODE_ACPI;
169 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "System supports ACPI mode only.\n"));
170 break;
| 186 AcpiGbl_Gpe0EnableRegisterSave = ACPI_MEM_ALLOCATE (
187 DIV_2 (AcpiGbl_FADT->Gpe0BlkLen));
188 if (!AcpiGbl_Gpe0EnableRegisterSave)
189 {
190 return_ACPI_STATUS (AE_NO_MEMORY);
191 }
|
171
| 192
|
| 193 /* Save state of GPE0 enable bits */
|
172
| 194
|
173 case (SYS_MODE_LEGACY):
174
175 AcpiGbl_OriginalMode = SYS_MODE_LEGACY;
176 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
177 "Tables loaded from buffer, hardware assumed to support LEGACY mode only.\n"));
178 break;
179
180
181 case (SYS_MODE_ACPI | SYS_MODE_LEGACY):
182
183 if (AcpiHwGetMode () == SYS_MODE_ACPI)
| 195 for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe0BlkLen); Index++)
|
184 {
| 196 {
|
185 AcpiGbl_OriginalMode = SYS_MODE_ACPI;
| 197 AcpiGbl_Gpe0EnableRegisterSave[Index] =
198 (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE0_EN_BLOCK | Index);
|
186 }
| 199 }
|
187 else
188 {
189 AcpiGbl_OriginalMode = SYS_MODE_LEGACY;
190 }
| 200 }
|
191
| 201
|
192 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
193 "System supports both ACPI and LEGACY modes.\n"));
194
195 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
196 "System is currently in %s mode.\n",
197 (AcpiGbl_OriginalMode == SYS_MODE_ACPI) ? "ACPI" : "LEGACY"));
198 break;
| 202 else
203 {
204 AcpiGbl_Gpe0EnableRegisterSave = NULL;
|
199 }
200
| 205 }
206
|
201
202 if (AcpiGbl_SystemFlags & SYS_MODE_ACPI)
| 207 if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe1Blk.Address) &&
208 AcpiGbl_FADT->Gpe1BlkLen)
|
203 {
| 209 {
|
204 /* Target system supports ACPI mode */
| 210 /* GPE1 defined */
|
205
| 211
|
206 /*
207 * The purpose of this code is to save the initial state
208 * of the ACPI event enable registers. An exit function will be
209 * registered which will restore this state when the application
210 * exits. The exit function will also clear all of the ACPI event
211 * status bits prior to restoring the original mode.
212 *
213 * The location of the PM1aEvtBlk enable registers is defined as the
214 * base of PM1aEvtBlk + DIV_2(PM1aEvtBlkLength). Since the spec further
215 * fully defines the PM1aEvtBlk to be a total of 4 bytes, the offset
216 * for the enable registers is always 2 from the base. It is hard
217 * coded here. If this changes in the spec, this code will need to
218 * be modified. The PM1bEvtBlk behaves as expected.
219 */
220 AcpiGbl_Pm1EnableRegisterSave = (UINT16) AcpiHwRegisterRead (
221 ACPI_MTX_LOCK, PM1_EN);
222
223
224 /*
225 * The GPEs behave similarly, except that the length of the register
226 * block is not fixed, so the buffer must be allocated with malloc
227 */
228 if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe0Blk.Address) &&
229 AcpiGbl_FADT->Gpe0BlkLen)
| 212 AcpiGbl_Gpe1EnableRegisterSave = ACPI_MEM_ALLOCATE (
213 DIV_2 (AcpiGbl_FADT->Gpe1BlkLen));
214 if (!AcpiGbl_Gpe1EnableRegisterSave)
|
230 {
| 215 {
|
231 /* GPE0 specified in FADT */
232
233 AcpiGbl_Gpe0EnableRegisterSave = ACPI_MEM_ALLOCATE (
234 DIV_2 (AcpiGbl_FADT->Gpe0BlkLen));
235 if (!AcpiGbl_Gpe0EnableRegisterSave)
236 {
237 return_ACPI_STATUS (AE_NO_MEMORY);
238 }
239
240 /* Save state of GPE0 enable bits */
241
242 for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe0BlkLen); Index++)
243 {
244 AcpiGbl_Gpe0EnableRegisterSave[Index] =
245 (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE0_EN_BLOCK | Index);
246 }
| 216 return_ACPI_STATUS (AE_NO_MEMORY);
|
247 }
248
| 217 }
218
|
249 else
250 {
251 AcpiGbl_Gpe0EnableRegisterSave = NULL;
252 }
| 219 /* save state of GPE1 enable bits */
|
253
| 220
|
254 if (ACPI_VALID_ADDRESS (AcpiGbl_FADT->XGpe1Blk.Address) &&
255 AcpiGbl_FADT->Gpe1BlkLen)
| 221 for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe1BlkLen); Index++)
|
256 {
| 222 {
|
257 /* GPE1 defined */
258
259 AcpiGbl_Gpe1EnableRegisterSave = ACPI_MEM_ALLOCATE (
260 DIV_2 (AcpiGbl_FADT->Gpe1BlkLen));
261 if (!AcpiGbl_Gpe1EnableRegisterSave)
262 {
263 return_ACPI_STATUS (AE_NO_MEMORY);
264 }
265
266 /* save state of GPE1 enable bits */
267
268 for (Index = 0; Index < DIV_2 (AcpiGbl_FADT->Gpe1BlkLen); Index++)
269 {
270 AcpiGbl_Gpe1EnableRegisterSave[Index] =
271 (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE1_EN_BLOCK | Index);
272 }
| 223 AcpiGbl_Gpe1EnableRegisterSave[Index] =
224 (UINT8) AcpiHwRegisterRead (ACPI_MTX_LOCK, GPE1_EN_BLOCK | Index);
|
273 }
| 225 }
|
| 226 }
|
274
| 227
|
275 else
276 {
277 AcpiGbl_Gpe1EnableRegisterSave = NULL;
278 }
| 228 else
229 {
230 AcpiGbl_Gpe1EnableRegisterSave = NULL;
|
279 }
280
281 return_ACPI_STATUS (Status);
282}
283
284
285/******************************************************************************
286 *
287 * FUNCTION: AcpiHwSetMode
288 *
289 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
290 *
291 * RETURN: Status
292 *
293 * DESCRIPTION: Transitions the system into the requested mode or does nothing
294 * if the system is already in that mode.
295 *
296 ******************************************************************************/
297
298ACPI_STATUS
299AcpiHwSetMode (
300 UINT32 Mode)
301{
302
303 ACPI_STATUS Status = AE_NO_HARDWARE_RESPONSE;
304
305
306 FUNCTION_TRACE ("HwSetMode");
307
308
309 if (Mode == SYS_MODE_ACPI)
310 {
311 /* BIOS should have disabled ALL fixed and GP events */
312
313 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiEnable, 8);
314 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
315 }
316
317 else if (Mode == SYS_MODE_LEGACY)
318 {
319 /*
320 * BIOS should clear all fixed status bits and restore fixed event
321 * enable bits to default
322 */
323 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiDisable, 8);
324 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
325 "Attempting to enable Legacy (non-ACPI) mode\n"));
326 }
327
328 /* Give the platform some time to react */
329
330 AcpiOsStall (20000);
331
332 if (AcpiHwGetMode () == Mode)
333 {
334 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", Mode));
335 Status = AE_OK;
336 }
337
338 return_ACPI_STATUS (Status);
339}
340
341
342/******************************************************************************
343 *
344 * FUNCTION: AcpiHwGetMode
345 *
346 * PARAMETERS: none
347 *
348 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
349 *
350 * DESCRIPTION: Return current operating state of system. Determined by
351 * querying the SCI_EN bit.
352 *
353 ******************************************************************************/
354
355UINT32
356AcpiHwGetMode (void)
357{
358
359 FUNCTION_TRACE ("HwGetMode");
360
361
362 if (AcpiHwRegisterBitAccess (ACPI_READ, ACPI_MTX_LOCK, SCI_EN))
363 {
364 return_VALUE (SYS_MODE_ACPI);
365 }
366 else
367 {
368 return_VALUE (SYS_MODE_LEGACY);
369 }
370}
| 231 }
232
233 return_ACPI_STATUS (Status);
234}
235
236
237/******************************************************************************
238 *
239 * FUNCTION: AcpiHwSetMode
240 *
241 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
242 *
243 * RETURN: Status
244 *
245 * DESCRIPTION: Transitions the system into the requested mode or does nothing
246 * if the system is already in that mode.
247 *
248 ******************************************************************************/
249
250ACPI_STATUS
251AcpiHwSetMode (
252 UINT32 Mode)
253{
254
255 ACPI_STATUS Status = AE_NO_HARDWARE_RESPONSE;
256
257
258 FUNCTION_TRACE ("HwSetMode");
259
260
261 if (Mode == SYS_MODE_ACPI)
262 {
263 /* BIOS should have disabled ALL fixed and GP events */
264
265 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiEnable, 8);
266 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
267 }
268
269 else if (Mode == SYS_MODE_LEGACY)
270 {
271 /*
272 * BIOS should clear all fixed status bits and restore fixed event
273 * enable bits to default
274 */
275 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->AcpiDisable, 8);
276 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
277 "Attempting to enable Legacy (non-ACPI) mode\n"));
278 }
279
280 /* Give the platform some time to react */
281
282 AcpiOsStall (20000);
283
284 if (AcpiHwGetMode () == Mode)
285 {
286 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", Mode));
287 Status = AE_OK;
288 }
289
290 return_ACPI_STATUS (Status);
291}
292
293
294/******************************************************************************
295 *
296 * FUNCTION: AcpiHwGetMode
297 *
298 * PARAMETERS: none
299 *
300 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
301 *
302 * DESCRIPTION: Return current operating state of system. Determined by
303 * querying the SCI_EN bit.
304 *
305 ******************************************************************************/
306
307UINT32
308AcpiHwGetMode (void)
309{
310
311 FUNCTION_TRACE ("HwGetMode");
312
313
314 if (AcpiHwRegisterBitAccess (ACPI_READ, ACPI_MTX_LOCK, SCI_EN))
315 {
316 return_VALUE (SYS_MODE_ACPI);
317 }
318 else
319 {
320 return_VALUE (SYS_MODE_LEGACY);
321 }
322}
|
371
372
373/******************************************************************************
374 *
375 * FUNCTION: AcpiHwGetModeCapabilities
376 *
377 * PARAMETERS: none
378 *
379 * RETURN: logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial
380 * system state.
381 *
382 * DESCRIPTION: Returns capablities of system
383 *
384 ******************************************************************************/
385
386UINT32
387AcpiHwGetModeCapabilities (void)
388{
389
390 FUNCTION_TRACE ("HwGetModeCapabilities");
391
392
393 if (!(AcpiGbl_SystemFlags & SYS_MODES_MASK))
394 {
395 if (AcpiHwGetMode () == SYS_MODE_LEGACY)
396 {
397 /*
398 * Assume that if this call is being made, AcpiInit has been called
399 * and ACPI support has been established by the presence of the
400 * tables. Therefore since we're in SYS_MODE_LEGACY, the system
401 * must support both modes
402 */
403 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
404 }
405
406 else
407 {
408 /* TBD: [Investigate] !!! this may be unsafe... */
409 /*
410 * system is is ACPI mode, so try to switch back to LEGACY to see if
411 * it is supported
412 */
413 AcpiHwSetMode (SYS_MODE_LEGACY);
414
415 if (AcpiHwGetMode () == SYS_MODE_LEGACY)
416 {
417 /* Now in SYS_MODE_LEGACY, so both are supported */
418
419 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
420 AcpiHwSetMode (SYS_MODE_ACPI);
421 }
422
423 else
424 {
425 /* Still in SYS_MODE_ACPI so this must be an ACPI only system */
426
427 AcpiGbl_SystemFlags |= SYS_MODE_ACPI;
428 }
429 }
430 }
431
432 return_VALUE (AcpiGbl_SystemFlags & SYS_MODES_MASK);
433}
434
435
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