/****************************************************************************** * * Module Name: exnames - interpreter/scanner name load/execute * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, 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 <acpi/acpi.h> #include "accommon.h" #include "acinterp.h" #include "amlcode.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME("exnames") /* Local prototypes */ static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs); static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string); /******************************************************************************* * * FUNCTION: acpi_ex_allocate_name_string * * PARAMETERS: prefix_count - Count of parent levels. Special cases: * (-1)==root, 0==none * num_name_segs - count of 4-character name segments * * RETURN: A pointer to the allocated string segment. This segment must * be deleted by the caller. * * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name * string is long enough, and set up prefix if any. * ******************************************************************************/ static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs) { char *temp_ptr; char *name_string; u32 size_needed; ACPI_FUNCTION_TRACE(ex_allocate_name_string); /* * Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix. * Also, one byte for the null terminator. * This may actually be somewhat longer than needed. */ if (prefix_count == ACPI_UINT32_MAX) { /* Special case for root */ size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1; } else { size_needed = prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1; } /* * Allocate a buffer for the name. * This buffer must be deleted by the caller! */ name_string = ACPI_ALLOCATE(size_needed); if (!name_string) { ACPI_ERROR((AE_INFO, "Could not allocate size %u", size_needed)); return_PTR(NULL); } temp_ptr = name_string; /* Set up Root or Parent prefixes if needed */ if (prefix_count == ACPI_UINT32_MAX) { *temp_ptr++ = AML_ROOT_PREFIX; } else { while (prefix_count--) { *temp_ptr++ = AML_PARENT_PREFIX; } } /* Set up Dual or Multi prefixes if needed */ if (num_name_segs > 2) { /* Set up multi prefixes */ *temp_ptr++ = AML_MULTI_NAME_PREFIX_OP; *temp_ptr++ = (char)num_name_segs; } else if (2 == num_name_segs) { /* Set up dual prefixes */ *temp_ptr++ = AML_DUAL_NAME_PREFIX; } /* * Terminate string following prefixes. acpi_ex_name_segment() will * append the segment(s) */ *temp_ptr = 0; return_PTR(name_string); } /******************************************************************************* * * FUNCTION: acpi_ex_name_segment * * PARAMETERS: in_aml_address - Pointer to the name in the AML code * name_string - Where to return the name. The name is appended * to any existing string to form a namepath * * RETURN: Status * * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream * ******************************************************************************/ static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string) { char *aml_address = (void *)*in_aml_address; acpi_status status = AE_OK; u32 index; char char_buf[5]; ACPI_FUNCTION_TRACE(ex_name_segment); /* * If first character is a digit, then we know that we aren't looking at a * valid name segment */ char_buf[0] = *aml_address; if ('0' <= char_buf[0] && char_buf[0] <= '9') { ACPI_ERROR((AE_INFO, "Invalid leading digit: %c", char_buf[0])); return_ACPI_STATUS(AE_CTRL_PENDING); } ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Bytes from stream:\n")); for (index = 0; (index < ACPI_NAME_SIZE) && (acpi_ut_valid_acpi_char(*aml_address, 0)); index++) { char_buf[index] = *aml_address++; ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "%c\n", char_buf[index])); } /* Valid name segment */ if (index == 4) { /* Found 4 valid characters */ char_buf[4] = '\0'; if (name_string) { ACPI_STRCAT(name_string, char_buf); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Appended to - %s\n", name_string)); } else { ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "No Name string - %s\n", char_buf)); } } else if (index == 0) { /* * First character was not a valid name character, * so we are looking at something other than a name. */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Leading character is not alpha: %02Xh (not a name)\n", char_buf[0])); status = AE_CTRL_PENDING; } else { /* * Segment started with one or more valid characters, but fewer than * the required 4 */ status = AE_AML_BAD_NAME; ACPI_ERROR((AE_INFO, "Bad character 0x%02x in name, at %p", *aml_address, aml_address)); } *in_aml_address = ACPI_CAST_PTR(u8, aml_address); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ex_get_name_string * * PARAMETERS: data_type - Object type to be associated with this * name * in_aml_address - Pointer to the namestring in the AML code * out_name_string - Where the namestring is returned * out_name_length - Length of the returned string * * RETURN: Status, namestring and length * * DESCRIPTION: Extract a full namepath from the AML byte stream, * including any prefixes. * ******************************************************************************/ acpi_status acpi_ex_get_name_string(acpi_object_type data_type, u8 * in_aml_address, char **out_name_string, u32 * out_name_length) { acpi_status status = AE_OK; u8 *aml_address = in_aml_address; char *name_string = NULL; u32 num_segments; u32 prefix_count = 0; u8 has_prefix = FALSE; ACPI_FUNCTION_TRACE_PTR(ex_get_name_string, aml_address); if (ACPI_TYPE_LOCAL_REGION_FIELD == data_type || ACPI_TYPE_LOCAL_BANK_FIELD == data_type || ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) { /* Disallow prefixes for types associated with field_unit names */ name_string = acpi_ex_allocate_name_string(0, 1); if (!name_string) { status = AE_NO_MEMORY; } else { status = acpi_ex_name_segment(&aml_address, name_string); } } else { /* * data_type is not a field name. * Examine first character of name for root or parent prefix operators */ switch (*aml_address) { case AML_ROOT_PREFIX: ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n", aml_address)); /* * Remember that we have a root_prefix -- * see comment in acpi_ex_allocate_name_string() */ aml_address++; prefix_count = ACPI_UINT32_MAX; has_prefix = TRUE; break; case AML_PARENT_PREFIX: /* Increment past possibly multiple parent prefixes */ do { ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n", aml_address)); aml_address++; prefix_count++; } while (*aml_address == AML_PARENT_PREFIX); has_prefix = TRUE; break; default: /* Not a prefix character */ break; } /* Examine first character of name for name segment prefix operator */ switch (*aml_address) { case AML_DUAL_NAME_PREFIX: ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "DualNamePrefix at %p\n", aml_address)); aml_address++; name_string = acpi_ex_allocate_name_string(prefix_count, 2); if (!name_string) { status = AE_NO_MEMORY; break; } /* Indicate that we processed a prefix */ has_prefix = TRUE; status = acpi_ex_name_segment(&aml_address, name_string); if (ACPI_SUCCESS(status)) { status = acpi_ex_name_segment(&aml_address, name_string); } break; case AML_MULTI_NAME_PREFIX_OP: ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "MultiNamePrefix at %p\n", aml_address)); /* Fetch count of segments remaining in name path */ aml_address++; num_segments = *aml_address; name_string = acpi_ex_allocate_name_string(prefix_count, num_segments); if (!name_string) { status = AE_NO_MEMORY; break; } /* Indicate that we processed a prefix */ aml_address++; has_prefix = TRUE; while (num_segments && (status = acpi_ex_name_segment(&aml_address, name_string)) == AE_OK) { num_segments--; } break; case 0: /* null_name valid as of 8-12-98 ASL/AML Grammar Update */ if (prefix_count == ACPI_UINT32_MAX) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "NameSeg is \"\\\" followed by NULL\n")); } /* Consume the NULL byte */ aml_address++; name_string = acpi_ex_allocate_name_string(prefix_count, 0); if (!name_string) { status = AE_NO_MEMORY; break; } break; default: /* Name segment string */ name_string = acpi_ex_allocate_name_string(prefix_count, 1); if (!name_string) { status = AE_NO_MEMORY; break; } status = acpi_ex_name_segment(&aml_address, name_string); break; } } if (AE_CTRL_PENDING == status && has_prefix) { /* Ran out of segments after processing a prefix */ ACPI_ERROR((AE_INFO, "Malformed Name at %p", name_string)); status = AE_AML_BAD_NAME; } if (ACPI_FAILURE(status)) { if (name_string) { ACPI_FREE(name_string); } return_ACPI_STATUS(status); } *out_name_string = name_string; *out_name_length = (u32) (aml_address - in_aml_address); return_ACPI_STATUS(status); }