summaryrefslogtreecommitdiffstats
path: root/sys/contrib/dev/acpica/compiler/asllength.c
blob: 618b63f4c2e58158dbcb3dbb0d86f8c82ad4160f (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
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
/******************************************************************************
 *
 * Module Name: asllength - Tree walk to determine package and opcode lengths
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, 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 <contrib/dev/acpica/compiler/aslcompiler.h>
#include "aslcompiler.y.h"
#include <contrib/dev/acpica/include/amlcode.h>


#define _COMPONENT          ACPI_COMPILER
        ACPI_MODULE_NAME    ("asllength")

/* Local prototypes */

static UINT8
CgGetPackageLenByteCount (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  PackageLength);

static void
CgGenerateAmlOpcodeLength (
    ACPI_PARSE_OBJECT       *Op);


#ifdef ACPI_OBSOLETE_FUNCTIONS
void
LnAdjustLengthToRoot (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  LengthDelta);
#endif


/*******************************************************************************
 *
 * FUNCTION:    LnInitLengthsWalk
 *
 * PARAMETERS:  ASL_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk callback to initialize (and re-initialize) the node
 *              subtree length(s) to zero. The Subtree lengths are bubbled
 *              up to the root node in order to get a total AML length.
 *
 ******************************************************************************/

ACPI_STATUS
LnInitLengthsWalk (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{

    Op->Asl.AmlSubtreeLength = 0;
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    LnPackageLengthWalk
 *
 * PARAMETERS:  ASL_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk callback to calculate the total AML length.
 *              1) Calculate the AML lengths (opcode, package length, etc.) for
 *                 THIS node.
 *              2) Bubbble up all of these lengths to the parent node by summing
 *                 them all into the parent subtree length.
 *
 * Note:  The SubtreeLength represents the total AML length of all child nodes
 *        in all subtrees under a given node. Therefore, once this walk is
 *        complete, the Root Node subtree length is the AML length of the entire
 *        tree (and thus, the entire ACPI table)
 *
 ******************************************************************************/

ACPI_STATUS
LnPackageLengthWalk (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{

    /* Generate the AML lengths for this node */

    CgGenerateAmlLengths (Op);

    /* Bubble up all lengths (this node and all below it) to the parent */

    if ((Op->Asl.Parent) &&
        (Op->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG))
    {
        Op->Asl.Parent->Asl.AmlSubtreeLength += (Op->Asl.AmlLength +
                                           Op->Asl.AmlOpcodeLength +
                                           Op->Asl.AmlPkgLenBytes +
                                           Op->Asl.AmlSubtreeLength);
    }
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    CgGetPackageLenByteCount
 *
 * PARAMETERS:  Op              - Parse node
 *              PackageLength   - Length to be encoded
 *
 * RETURN:      Required length of the package length encoding
 *
 * DESCRIPTION: Calculate the number of bytes required to encode the given
 *              package length.
 *
 ******************************************************************************/

static UINT8
CgGetPackageLenByteCount (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  PackageLength)
{

    /*
     * Determine the number of bytes required to encode the package length
     * Note: the package length includes the number of bytes used to encode
     * the package length, so we must account for this also.
     */
    if (PackageLength <= (0x0000003F - 1))
    {
        return (1);
    }
    else if (PackageLength <= (0x00000FFF - 2))
    {
        return (2);
    }
    else if (PackageLength <= (0x000FFFFF - 3))
    {
        return (3);
    }
    else if (PackageLength <= (0x0FFFFFFF - 4))
    {
        return (4);
    }
    else
    {
        /* Fatal error - the package length is too large to encode */

        AslError (ASL_ERROR, ASL_MSG_ENCODING_LENGTH, Op, NULL);
    }

    return (0);
}


/*******************************************************************************
 *
 * FUNCTION:    CgGenerateAmlOpcodeLength
 *
 * PARAMETERS:  Op          - Parse node whose AML opcode lengths will be
 *                            calculated
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Calculate the AmlOpcodeLength, AmlPkgLenBytes, and AmlLength
 *              fields for this node.
 *
 ******************************************************************************/

static void
CgGenerateAmlOpcodeLength (
    ACPI_PARSE_OBJECT       *Op)
{

    /* Check for two-byte opcode */

    if (Op->Asl.AmlOpcode > 0x00FF)
    {
        Op->Asl.AmlOpcodeLength = 2;
    }
    else
    {
        Op->Asl.AmlOpcodeLength = 1;
    }

    /* Does this opcode have an associated "PackageLength" field? */

    Op->Asl.AmlPkgLenBytes = 0;
    if (Op->Asl.CompileFlags & NODE_AML_PACKAGE)
    {
        Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (
                                    Op, Op->Asl.AmlSubtreeLength);
    }

    /* Data opcode lengths are easy */

    switch (Op->Asl.AmlOpcode)
    {
    case AML_BYTE_OP:

        Op->Asl.AmlLength = 1;
        break;

    case AML_WORD_OP:

        Op->Asl.AmlLength = 2;
        break;

    case AML_DWORD_OP:

        Op->Asl.AmlLength = 4;
        break;

    case AML_QWORD_OP:

        Op->Asl.AmlLength = 8;
        break;

    default:

        /* All data opcodes must be above */
        break;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    CgGenerateAmlLengths
 *
 * PARAMETERS:  Op        - Parse node
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Generate internal length fields based on the AML opcode or
 *              parse opcode.
 *
 ******************************************************************************/

void
CgGenerateAmlLengths (
    ACPI_PARSE_OBJECT       *Op)
{
    char                    *Buffer;
    ACPI_STATUS             Status;


    switch (Op->Asl.AmlOpcode)
    {
    case AML_RAW_DATA_BYTE:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlLength = 1;
        return;

    case AML_RAW_DATA_WORD:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlLength = 2;
        return;

    case AML_RAW_DATA_DWORD:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlLength = 4;
        return;

    case AML_RAW_DATA_QWORD:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlLength = 8;
        return;

    case AML_RAW_DATA_BUFFER:

        /* Aml length is/was set by creator */

        Op->Asl.AmlOpcodeLength = 0;
        return;

    case AML_RAW_DATA_CHAIN:

        /* Aml length is/was set by creator */

        Op->Asl.AmlOpcodeLength = 0;
        return;

    default:

        break;
    }

    switch (Op->Asl.ParseOpcode)
    {
    case PARSEOP_DEFINITIONBLOCK:

        Gbl_TableLength = sizeof (ACPI_TABLE_HEADER) +
                            Op->Asl.AmlSubtreeLength;
        break;

    case PARSEOP_NAMESEG:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlLength = 4;
        Op->Asl.ExternalName = Op->Asl.Value.String;
        break;

    case PARSEOP_NAMESTRING:
    case PARSEOP_METHODCALL:

        if (Op->Asl.CompileFlags & NODE_NAME_INTERNALIZED)
        {
            break;
        }

        Op->Asl.AmlOpcodeLength = 0;
        Status = UtInternalizeName (Op->Asl.Value.String, &Buffer);
        if (ACPI_FAILURE (Status))
        {
            DbgPrint (ASL_DEBUG_OUTPUT,
                "Failure from internalize name %X\n", Status);
            break;
        }

        Op->Asl.ExternalName = Op->Asl.Value.String;
        Op->Asl.Value.String = Buffer;
        Op->Asl.CompileFlags |= NODE_NAME_INTERNALIZED;

        Op->Asl.AmlLength = strlen (Buffer);

        /*
         * Check for single backslash reference to root,
         * make it a null terminated string in the AML
         */
        if (Op->Asl.AmlLength == 1)
        {
            Op->Asl.AmlLength = 2;
        }
        break;

    case PARSEOP_STRING_LITERAL:

        Op->Asl.AmlOpcodeLength = 1;

        /* Get null terminator */

        Op->Asl.AmlLength = strlen (Op->Asl.Value.String) + 1;
        break;

    case PARSEOP_PACKAGE_LENGTH:

        Op->Asl.AmlOpcodeLength = 0;
        Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (Op,
                                    (UINT32) Op->Asl.Value.Integer);
        break;

    case PARSEOP_RAW_DATA:

        Op->Asl.AmlOpcodeLength = 0;
        break;

    case PARSEOP_DEFAULT_ARG:
    case PARSEOP_EXTERNAL:
    case PARSEOP_INCLUDE:
    case PARSEOP_INCLUDE_END:

        /* Ignore the "default arg" nodes, they are extraneous at this point */

        break;

    default:

        CgGenerateAmlOpcodeLength (Op);
        break;
    }
}


#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
 *
 * FUNCTION:    LnAdjustLengthToRoot
 *
 * PARAMETERS:  Op      - Node whose Length was changed
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Change the Subtree length of the given node, and bubble the
 *              change all the way up to the root node. This allows for
 *              last second changes to a package length (for example, if the
 *              package length encoding gets shorter or longer.)
 *
 ******************************************************************************/

void
LnAdjustLengthToRoot (
    ACPI_PARSE_OBJECT       *SubtreeOp,
    UINT32                  LengthDelta)
{
    ACPI_PARSE_OBJECT       *Op;


    /* Adjust all subtree lengths up to the root */

    Op = SubtreeOp->Asl.Parent;
    while (Op)
    {
        Op->Asl.AmlSubtreeLength -= LengthDelta;
        Op = Op->Asl.Parent;
    }

    /* Adjust the global table length */

    Gbl_TableLength -= LengthDelta;
}
#endif
OpenPOWER on IntegriCloud