Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | /****************************************************************************** |
| 3 | * |
| 4 | * Module Name: exnames - interpreter/scanner name load/execute |
| 5 | * |
| 6 | *****************************************************************************/ |
| 7 | |
| 8 | /* |
Bob Moore | 4a90c7e | 2006-01-13 16:22:00 -0500 | [diff] [blame] | 9 | * Copyright (C) 2000 - 2006, R. Byron Moore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <acpi/acpi.h> |
| 46 | #include <acpi/acinterp.h> |
| 47 | #include <acpi/amlcode.h> |
| 48 | |
| 49 | #define _COMPONENT ACPI_EXECUTER |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | ACPI_MODULE_NAME("exnames") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 52 | /* Local prototypes */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 53 | static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 55 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 56 | acpi_ex_name_segment(u8 ** in_aml_address, char *name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /******************************************************************************* |
| 59 | * |
| 60 | * FUNCTION: acpi_ex_allocate_name_string |
| 61 | * |
| 62 | * PARAMETERS: prefix_count - Count of parent levels. Special cases: |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 63 | * (-1)==root, 0==none |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | * num_name_segs - count of 4-character name segments |
| 65 | * |
| 66 | * RETURN: A pointer to the allocated string segment. This segment must |
| 67 | * be deleted by the caller. |
| 68 | * |
| 69 | * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name |
| 70 | * string is long enough, and set up prefix if any. |
| 71 | * |
| 72 | ******************************************************************************/ |
| 73 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 74 | static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 76 | char *temp_ptr; |
| 77 | char *name_string; |
| 78 | u32 size_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 80 | ACPI_FUNCTION_TRACE("ex_allocate_name_string"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 83 | * Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | * Also, one byte for the null terminator. |
| 85 | * This may actually be somewhat longer than needed. |
| 86 | */ |
| 87 | if (prefix_count == ACPI_UINT32_MAX) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | /* Special case for root */ |
| 90 | |
| 91 | size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 92 | } else { |
| 93 | size_needed = |
| 94 | prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Allocate a buffer for the name. |
| 99 | * This buffer must be deleted by the caller! |
| 100 | */ |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 101 | name_string = ACPI_ALLOCATE(size_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | if (!name_string) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 103 | ACPI_ERROR((AE_INFO, |
| 104 | "Could not allocate size %d", size_needed)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 105 | return_PTR(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | temp_ptr = name_string; |
| 109 | |
| 110 | /* Set up Root or Parent prefixes if needed */ |
| 111 | |
| 112 | if (prefix_count == ACPI_UINT32_MAX) { |
| 113 | *temp_ptr++ = AML_ROOT_PREFIX; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 114 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | while (prefix_count--) { |
| 116 | *temp_ptr++ = AML_PARENT_PREFIX; |
| 117 | } |
| 118 | } |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | /* Set up Dual or Multi prefixes if needed */ |
| 121 | |
| 122 | if (num_name_segs > 2) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | /* Set up multi prefixes */ |
| 125 | |
| 126 | *temp_ptr++ = AML_MULTI_NAME_PREFIX_OP; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 127 | *temp_ptr++ = (char)num_name_segs; |
| 128 | } else if (2 == num_name_segs) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | /* Set up dual prefixes */ |
| 131 | |
| 132 | *temp_ptr++ = AML_DUAL_NAME_PREFIX; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Terminate string following prefixes. acpi_ex_name_segment() will |
| 137 | * append the segment(s) |
| 138 | */ |
| 139 | *temp_ptr = 0; |
| 140 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 141 | return_PTR(name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | /******************************************************************************* |
| 145 | * |
| 146 | * FUNCTION: acpi_ex_name_segment |
| 147 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 148 | * PARAMETERS: in_aml_address - Pointer to the name in the AML code |
| 149 | * name_string - Where to return the name. The name is appended |
| 150 | * to any existing string to form a namepath |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | * |
| 152 | * RETURN: Status |
| 153 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 154 | * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * |
| 156 | ******************************************************************************/ |
| 157 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 158 | static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 160 | char *aml_address = (void *)*in_aml_address; |
| 161 | acpi_status status = AE_OK; |
| 162 | u32 index; |
| 163 | char char_buf[5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 165 | ACPI_FUNCTION_TRACE("ex_name_segment"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | /* |
| 168 | * If first character is a digit, then we know that we aren't looking at a |
| 169 | * valid name segment |
| 170 | */ |
| 171 | char_buf[0] = *aml_address; |
| 172 | |
| 173 | if ('0' <= char_buf[0] && char_buf[0] <= '9') { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 174 | ACPI_ERROR((AE_INFO, "Invalid leading digit: %c", char_buf[0])); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 175 | return_ACPI_STATUS(AE_CTRL_PENDING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Bytes from stream:\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | for (index = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 181 | (index < ACPI_NAME_SIZE) |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame^] | 182 | && (acpi_ut_valid_acpi_char(*aml_address, 0)); index++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | char_buf[index] = *aml_address++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 184 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "%c\n", char_buf[index])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | /* Valid name segment */ |
| 188 | |
| 189 | if (index == 4) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | /* Found 4 valid characters */ |
| 192 | |
| 193 | char_buf[4] = '\0'; |
| 194 | |
| 195 | if (name_string) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 196 | ACPI_STRCAT(name_string, char_buf); |
| 197 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 198 | "Appended to - %s\n", name_string)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 199 | } else { |
| 200 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 201 | "No Name string - %s\n", char_buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 203 | } else if (index == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* |
| 205 | * First character was not a valid name character, |
| 206 | * so we are looking at something other than a name. |
| 207 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 208 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 209 | "Leading character is not alpha: %02Xh (not a name)\n", |
| 210 | char_buf[0])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | status = AE_CTRL_PENDING; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 212 | } else { |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 213 | /* |
| 214 | * Segment started with one or more valid characters, but fewer than |
| 215 | * the required 4 |
| 216 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | status = AE_AML_BAD_NAME; |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 218 | ACPI_ERROR((AE_INFO, |
| 219 | "Bad character %02x in name, at %p", |
| 220 | *aml_address, aml_address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Bob Moore | c51a4de | 2005-11-17 13:07:00 -0500 | [diff] [blame] | 223 | *in_aml_address = ACPI_CAST_PTR(u8, aml_address); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 224 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | /******************************************************************************* |
| 228 | * |
| 229 | * FUNCTION: acpi_ex_get_name_string |
| 230 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 231 | * PARAMETERS: data_type - Object type to be associated with this |
| 232 | * name |
| 233 | * in_aml_address - Pointer to the namestring in the AML code |
| 234 | * out_name_string - Where the namestring is returned |
| 235 | * out_name_length - Length of the returned string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 237 | * RETURN: Status, namestring and length |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 239 | * DESCRIPTION: Extract a full namepath from the AML byte stream, |
| 240 | * including any prefixes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | * |
| 242 | ******************************************************************************/ |
| 243 | |
| 244 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 245 | acpi_ex_get_name_string(acpi_object_type data_type, |
| 246 | u8 * in_aml_address, |
| 247 | char **out_name_string, u32 * out_name_length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 249 | acpi_status status = AE_OK; |
| 250 | u8 *aml_address = in_aml_address; |
| 251 | char *name_string = NULL; |
| 252 | u32 num_segments; |
| 253 | u32 prefix_count = 0; |
| 254 | u8 has_prefix = FALSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 256 | ACPI_FUNCTION_TRACE_PTR("ex_get_name_string", aml_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 258 | if (ACPI_TYPE_LOCAL_REGION_FIELD == data_type || |
| 259 | ACPI_TYPE_LOCAL_BANK_FIELD == data_type || |
| 260 | ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* Disallow prefixes for types associated with field_unit names */ |
| 263 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 264 | name_string = acpi_ex_allocate_name_string(0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | if (!name_string) { |
| 266 | status = AE_NO_MEMORY; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 267 | } else { |
| 268 | status = |
| 269 | acpi_ex_name_segment(&aml_address, name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 271 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | /* |
| 273 | * data_type is not a field name. |
| 274 | * Examine first character of name for root or parent prefix operators |
| 275 | */ |
| 276 | switch (*aml_address) { |
| 277 | case AML_ROOT_PREFIX: |
| 278 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 279 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
| 280 | "root_prefix(\\) at %p\n", |
| 281 | aml_address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Remember that we have a root_prefix -- |
| 285 | * see comment in acpi_ex_allocate_name_string() |
| 286 | */ |
| 287 | aml_address++; |
| 288 | prefix_count = ACPI_UINT32_MAX; |
| 289 | has_prefix = TRUE; |
| 290 | break; |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | case AML_PARENT_PREFIX: |
| 293 | |
| 294 | /* Increment past possibly multiple parent prefixes */ |
| 295 | |
| 296 | do { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 297 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
| 298 | "parent_prefix (^) at %p\n", |
| 299 | aml_address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | aml_address++; |
| 302 | prefix_count++; |
| 303 | |
| 304 | } while (*aml_address == AML_PARENT_PREFIX); |
| 305 | |
| 306 | has_prefix = TRUE; |
| 307 | break; |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | default: |
| 310 | |
| 311 | /* Not a prefix character */ |
| 312 | |
| 313 | break; |
| 314 | } |
| 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | /* Examine first character of name for name segment prefix operator */ |
| 317 | |
| 318 | switch (*aml_address) { |
| 319 | case AML_DUAL_NAME_PREFIX: |
| 320 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
| 322 | "dual_name_prefix at %p\n", |
| 323 | aml_address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | aml_address++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 326 | name_string = |
| 327 | acpi_ex_allocate_name_string(prefix_count, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | if (!name_string) { |
| 329 | status = AE_NO_MEMORY; |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | /* Indicate that we processed a prefix */ |
| 334 | |
| 335 | has_prefix = TRUE; |
| 336 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 337 | status = |
| 338 | acpi_ex_name_segment(&aml_address, name_string); |
| 339 | if (ACPI_SUCCESS(status)) { |
| 340 | status = |
| 341 | acpi_ex_name_segment(&aml_address, |
| 342 | name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | break; |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | case AML_MULTI_NAME_PREFIX_OP: |
| 347 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 348 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, |
| 349 | "multi_name_prefix at %p\n", |
| 350 | aml_address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | /* Fetch count of segments remaining in name path */ |
| 353 | |
| 354 | aml_address++; |
| 355 | num_segments = *aml_address; |
| 356 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 357 | name_string = |
| 358 | acpi_ex_allocate_name_string(prefix_count, |
| 359 | num_segments); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (!name_string) { |
| 361 | status = AE_NO_MEMORY; |
| 362 | break; |
| 363 | } |
| 364 | |
| 365 | /* Indicate that we processed a prefix */ |
| 366 | |
| 367 | aml_address++; |
| 368 | has_prefix = TRUE; |
| 369 | |
| 370 | while (num_segments && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 371 | (status = |
| 372 | acpi_ex_name_segment(&aml_address, |
| 373 | name_string)) == AE_OK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | num_segments--; |
| 375 | } |
| 376 | |
| 377 | break; |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | case 0: |
| 380 | |
| 381 | /* null_name valid as of 8-12-98 ASL/AML Grammar Update */ |
| 382 | |
| 383 | if (prefix_count == ACPI_UINT32_MAX) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 384 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| 385 | "name_seg is \"\\\" followed by NULL\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | /* Consume the NULL byte */ |
| 389 | |
| 390 | aml_address++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 391 | name_string = |
| 392 | acpi_ex_allocate_name_string(prefix_count, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | if (!name_string) { |
| 394 | status = AE_NO_MEMORY; |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | break; |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | default: |
| 401 | |
| 402 | /* Name segment string */ |
| 403 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 404 | name_string = |
| 405 | acpi_ex_allocate_name_string(prefix_count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (!name_string) { |
| 407 | status = AE_NO_MEMORY; |
| 408 | break; |
| 409 | } |
| 410 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 411 | status = |
| 412 | acpi_ex_name_segment(&aml_address, name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | break; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | if (AE_CTRL_PENDING == status && has_prefix) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* Ran out of segments after processing a prefix */ |
| 420 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 421 | ACPI_ERROR((AE_INFO, "Malformed Name at %p", name_string)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | status = AE_AML_BAD_NAME; |
| 423 | } |
| 424 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 425 | if (ACPI_FAILURE(status)) { |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 426 | if (name_string) { |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 427 | ACPI_FREE(name_string); |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 428 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 429 | return_ACPI_STATUS(status); |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 430 | } |
| 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | *out_name_string = name_string; |
| 433 | *out_name_length = (u32) (aml_address - in_aml_address); |
| 434 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 435 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | } |