diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/executer/exresolv.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/acpi/executer/exresolv.c')
-rw-r--r-- | drivers/acpi/executer/exresolv.c | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/drivers/acpi/executer/exresolv.c b/drivers/acpi/executer/exresolv.c new file mode 100644 index 00000000000..7be60491115 --- /dev/null +++ b/drivers/acpi/executer/exresolv.c @@ -0,0 +1,546 @@ + +/****************************************************************************** + * + * Module Name: exresolv - AML Interpreter object resolution + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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 <acpi/amlcode.h> +#include <acpi/acdispat.h> +#include <acpi/acinterp.h> +#include <acpi/acnamesp.h> +#include <acpi/acparser.h> + + +#define _COMPONENT ACPI_EXECUTER + ACPI_MODULE_NAME ("exresolv") + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_resolve_to_value + * + * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can + * be either an (union acpi_operand_object *) + * or an acpi_handle. + * walk_state - Current method state + * + * RETURN: Status + * + * DESCRIPTION: Convert Reference objects to values + * + ******************************************************************************/ + +acpi_status +acpi_ex_resolve_to_value ( + union acpi_operand_object **stack_ptr, + struct acpi_walk_state *walk_state) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE_PTR ("ex_resolve_to_value", stack_ptr); + + + if (!stack_ptr || !*stack_ptr) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Internal - null pointer\n")); + return_ACPI_STATUS (AE_AML_NO_OPERAND); + } + + /* + * The entity pointed to by the stack_ptr can be either + * 1) A valid union acpi_operand_object, or + * 2) A struct acpi_namespace_node (named_obj) + */ + if (ACPI_GET_DESCRIPTOR_TYPE (*stack_ptr) == ACPI_DESC_TYPE_OPERAND) { + status = acpi_ex_resolve_object_to_value (stack_ptr, walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + + /* + * Object on the stack may have changed if acpi_ex_resolve_object_to_value() + * was called (i.e., we can't use an _else_ here.) + */ + if (ACPI_GET_DESCRIPTOR_TYPE (*stack_ptr) == ACPI_DESC_TYPE_NAMED) { + status = acpi_ex_resolve_node_to_value ( + ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, stack_ptr), + walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr)); + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_resolve_object_to_value + * + * PARAMETERS: stack_ptr - Pointer to a stack location that contains a + * ptr to an internal object. + * walk_state - Current method state + * + * RETURN: Status + * + * DESCRIPTION: Retrieve the value from an internal object. The Reference type + * uses the associated AML opcode to determine the value. + * + ******************************************************************************/ + +acpi_status +acpi_ex_resolve_object_to_value ( + union acpi_operand_object **stack_ptr, + struct acpi_walk_state *walk_state) +{ + acpi_status status = AE_OK; + union acpi_operand_object *stack_desc; + void *temp_node; + union acpi_operand_object *obj_desc; + u16 opcode; + + + ACPI_FUNCTION_TRACE ("ex_resolve_object_to_value"); + + + stack_desc = *stack_ptr; + + /* This is an union acpi_operand_object */ + + switch (ACPI_GET_OBJECT_TYPE (stack_desc)) { + case ACPI_TYPE_LOCAL_REFERENCE: + + opcode = stack_desc->reference.opcode; + + switch (opcode) { + case AML_NAME_OP: + + /* + * Convert indirect name ptr to a direct name ptr. + * Then, acpi_ex_resolve_node_to_value can be used to get the value + */ + temp_node = stack_desc->reference.object; + + /* Delete the Reference Object */ + + acpi_ut_remove_reference (stack_desc); + + /* Put direct name pointer onto stack and exit */ + + (*stack_ptr) = temp_node; + break; + + + case AML_LOCAL_OP: + case AML_ARG_OP: + + /* + * Get the local from the method's state info + * Note: this increments the local's object reference count + */ + status = acpi_ds_method_data_get_value (opcode, + stack_desc->reference.offset, walk_state, &obj_desc); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] value_obj is %p\n", + stack_desc->reference.offset, obj_desc)); + + /* + * Now we can delete the original Reference Object and + * replace it with the resolved value + */ + acpi_ut_remove_reference (stack_desc); + *stack_ptr = obj_desc; + break; + + + case AML_INDEX_OP: + + switch (stack_desc->reference.target_type) { + case ACPI_TYPE_BUFFER_FIELD: + + /* Just return - leave the Reference on the stack */ + break; + + + case ACPI_TYPE_PACKAGE: + + obj_desc = *stack_desc->reference.where; + if (obj_desc) { + /* + * Valid obj descriptor, copy pointer to return value + * (i.e., dereference the package index) + * Delete the ref object, increment the returned object + */ + acpi_ut_remove_reference (stack_desc); + acpi_ut_add_reference (obj_desc); + *stack_ptr = obj_desc; + } + else { + /* + * A NULL object descriptor means an unitialized element of + * the package, can't dereference it + */ + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Attempt to deref an Index to NULL pkg element Idx=%p\n", + stack_desc)); + status = AE_AML_UNINITIALIZED_ELEMENT; + } + break; + + + default: + + /* Invalid reference object */ + + ACPI_REPORT_ERROR (( + "During resolve, Unknown target_type %X in Index/Reference obj %p\n", + stack_desc->reference.target_type, stack_desc)); + status = AE_AML_INTERNAL; + break; + } + break; + + + case AML_REF_OF_OP: + case AML_DEBUG_OP: + case AML_LOAD_OP: + + /* Just leave the object as-is */ + + break; + + + default: + + ACPI_REPORT_ERROR (("During resolve, Unknown Reference opcode %X (%s) in %p\n", + opcode, acpi_ps_get_opcode_name (opcode), stack_desc)); + status = AE_AML_INTERNAL; + break; + } + break; + + + case ACPI_TYPE_BUFFER: + + status = acpi_ds_get_buffer_arguments (stack_desc); + break; + + + case ACPI_TYPE_PACKAGE: + + status = acpi_ds_get_package_arguments (stack_desc); + break; + + + /* + * These cases may never happen here, but just in case.. + */ + case ACPI_TYPE_BUFFER_FIELD: + case ACPI_TYPE_LOCAL_REGION_FIELD: + case ACPI_TYPE_LOCAL_BANK_FIELD: + case ACPI_TYPE_LOCAL_INDEX_FIELD: + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "field_read source_desc=%p Type=%X\n", + stack_desc, ACPI_GET_OBJECT_TYPE (stack_desc))); + + status = acpi_ex_read_data_from_field (walk_state, stack_desc, &obj_desc); + *stack_ptr = (void *) obj_desc; + break; + + default: + break; + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_resolve_multiple + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * Operand - Starting point for resolution + * return_type - Where the object type is returned + * return_desc - Where the resolved object is returned + * + * RETURN: Status + * + * DESCRIPTION: Return the base object and type. Traverse a reference list if + * necessary to get to the base object. + * + ******************************************************************************/ + +acpi_status +acpi_ex_resolve_multiple ( + struct acpi_walk_state *walk_state, + union acpi_operand_object *operand, + acpi_object_type *return_type, + union acpi_operand_object **return_desc) +{ + union acpi_operand_object *obj_desc = (void *) operand; + struct acpi_namespace_node *node; + acpi_object_type type; + acpi_status status; + + + ACPI_FUNCTION_TRACE ("acpi_ex_resolve_multiple"); + + + /* + * Operand can be either a namespace node or an operand descriptor + */ + switch (ACPI_GET_DESCRIPTOR_TYPE (obj_desc)) { + case ACPI_DESC_TYPE_OPERAND: + type = obj_desc->common.type; + break; + + case ACPI_DESC_TYPE_NAMED: + type = ((struct acpi_namespace_node *) obj_desc)->type; + obj_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) obj_desc); + + /* If we had an Alias node, use the attached object for type info */ + + if (type == ACPI_TYPE_LOCAL_ALIAS) { + type = ((struct acpi_namespace_node *) obj_desc)->type; + obj_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) obj_desc); + } + break; + + default: + return_ACPI_STATUS (AE_AML_OPERAND_TYPE); + } + + + /* + * If type is anything other than a reference, we are done + */ + if (type != ACPI_TYPE_LOCAL_REFERENCE) { + goto exit; + } + + /* + * For reference objects created via the ref_of or Index operators, + * we need to get to the base object (as per the ACPI specification + * of the object_type and size_of operators). This means traversing + * the list of possibly many nested references. + */ + while (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_REFERENCE) { + switch (obj_desc->reference.opcode) { + case AML_REF_OF_OP: + + /* Dereference the reference pointer */ + + node = obj_desc->reference.object; + + /* All "References" point to a NS node */ + + if (ACPI_GET_DESCRIPTOR_TYPE (node) != ACPI_DESC_TYPE_NAMED) { + ACPI_REPORT_ERROR (("acpi_ex_resolve_multiple: Not a NS node %p [%s]\n", + node, acpi_ut_get_descriptor_name (node))); + return_ACPI_STATUS (AE_AML_INTERNAL); + } + + /* Get the attached object */ + + obj_desc = acpi_ns_get_attached_object (node); + if (!obj_desc) { + /* No object, use the NS node type */ + + type = acpi_ns_get_type (node); + goto exit; + } + + /* Check for circular references */ + + if (obj_desc == operand) { + return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE); + } + break; + + + case AML_INDEX_OP: + + /* Get the type of this reference (index into another object) */ + + type = obj_desc->reference.target_type; + if (type != ACPI_TYPE_PACKAGE) { + goto exit; + } + + /* + * The main object is a package, we want to get the type + * of the individual package element that is referenced by + * the index. + * + * This could of course in turn be another reference object. + */ + obj_desc = *(obj_desc->reference.where); + if (!obj_desc) { + /* NULL package elements are allowed */ + + type = 0; /* Uninitialized */ + goto exit; + } + break; + + + case AML_INT_NAMEPATH_OP: + + /* Dereference the reference pointer */ + + node = obj_desc->reference.node; + + /* All "References" point to a NS node */ + + if (ACPI_GET_DESCRIPTOR_TYPE (node) != ACPI_DESC_TYPE_NAMED) { + ACPI_REPORT_ERROR (("acpi_ex_resolve_multiple: Not a NS node %p [%s]\n", + node, acpi_ut_get_descriptor_name (node))); + return_ACPI_STATUS (AE_AML_INTERNAL); + } + + /* Get the attached object */ + + obj_desc = acpi_ns_get_attached_object (node); + if (!obj_desc) { + /* No object, use the NS node type */ + + type = acpi_ns_get_type (node); + goto exit; + } + + /* Check for circular references */ + + if (obj_desc == operand) { + return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE); + } + break; + + + case AML_LOCAL_OP: + case AML_ARG_OP: + + if (return_desc) { + status = acpi_ds_method_data_get_value (obj_desc->reference.opcode, + obj_desc->reference.offset, walk_state, &obj_desc); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + acpi_ut_remove_reference (obj_desc); + } + else { + status = acpi_ds_method_data_get_node (obj_desc->reference.opcode, + obj_desc->reference.offset, walk_state, &node); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + obj_desc = acpi_ns_get_attached_object (node); + if (!obj_desc) { + type = ACPI_TYPE_ANY; + goto exit; + } + } + break; + + + case AML_DEBUG_OP: + + /* The Debug Object is of type "debug_object" */ + + type = ACPI_TYPE_DEBUG_OBJECT; + goto exit; + + + default: + + ACPI_REPORT_ERROR (("acpi_ex_resolve_multiple: Unknown Reference subtype %X\n", + obj_desc->reference.opcode)); + return_ACPI_STATUS (AE_AML_INTERNAL); + } + } + + /* + * Now we are guaranteed to have an object that has not been created + * via the ref_of or Index operators. + */ + type = ACPI_GET_OBJECT_TYPE (obj_desc); + + +exit: + /* Convert internal types to external types */ + + switch (type) { + case ACPI_TYPE_LOCAL_REGION_FIELD: + case ACPI_TYPE_LOCAL_BANK_FIELD: + case ACPI_TYPE_LOCAL_INDEX_FIELD: + + type = ACPI_TYPE_FIELD_UNIT; + break; + + case ACPI_TYPE_LOCAL_SCOPE: + + /* Per ACPI Specification, Scope is untyped */ + + type = ACPI_TYPE_ANY; + break; + + default: + /* No change to Type required */ + break; + } + + *return_type = type; + if (return_desc) { + *return_desc = obj_desc; + } + return_ACPI_STATUS (AE_OK); +} + + |