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44f6c01242
linux/drivers/acpi/parser/psparse.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore 
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

1305 lines
35 KiB
C
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/******************************************************************************
*
* Module Name: psparse - Parser top level AML parse routines
*
*****************************************************************************/
/*
* 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.
*/
/*
* Parse the AML and build an operation tree as most interpreters,
* like Perl, do. Parsing is done by hand rather than with a YACC
* generated parser to tightly constrain stack and dynamic memory
* usage. At the same time, parsing is kept flexible and the code
* fairly compact by parsing based on a list of AML opcode
* templates in aml_op_info[]
*/
#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME ("psparse")
static u32 acpi_gbl_depth = 0;
/* Local prototypes */
static void
acpi_ps_complete_this_op (
struct acpi_walk_state *walk_state,
union acpi_parse_object *op);
static acpi_status
acpi_ps_next_parse_state (
struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
acpi_status callback_status);
static acpi_status
acpi_ps_parse_loop (
struct acpi_walk_state *walk_state);
/*******************************************************************************
*
* FUNCTION: acpi_ps_get_opcode_size
*
* PARAMETERS: Opcode - An AML opcode
*
* RETURN: Size of the opcode, in bytes (1 or 2)
*
* DESCRIPTION: Get the size of the current opcode.
*
******************************************************************************/
u32
acpi_ps_get_opcode_size (
u32 opcode)
{
/* Extended (2-byte) opcode if > 255 */
if (opcode > 0x00FF) {
return (2);
}
/* Otherwise, just a single byte opcode */
return (1);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_peek_opcode
*
* PARAMETERS: parser_state - A parser state object
*
* RETURN: Next AML opcode
*
* DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
*
******************************************************************************/
u16
acpi_ps_peek_opcode (
struct acpi_parse_state *parser_state)
{
u8 *aml;
u16 opcode;
aml = parser_state->aml;
opcode = (u16) ACPI_GET8 (aml);
if (opcode == AML_EXTOP) {
/* Extended opcode */
aml++;
opcode = (u16) ((opcode << 8) | ACPI_GET8 (aml));
}
return (opcode);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_complete_this_op
*
* PARAMETERS: walk_state - Current State
* Op - Op to complete
*
* RETURN: None.
*
* DESCRIPTION: Perform any cleanup at the completion of an Op.
*
******************************************************************************/
static void
acpi_ps_complete_this_op (
struct acpi_walk_state *walk_state,
union acpi_parse_object *op)
{
union acpi_parse_object *prev;
union acpi_parse_object *next;
const struct acpi_opcode_info *parent_info;
union acpi_parse_object *replacement_op = NULL;
ACPI_FUNCTION_TRACE_PTR ("ps_complete_this_op", op);
/* Check for null Op, can happen if AML code is corrupt */
if (!op) {
return_VOID;
}
/* Delete this op and the subtree below it if asked to */
if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
(walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
return_VOID;
}
/* Make sure that we only delete this subtree */
if (op->common.parent) {
/*
* Check if we need to replace the operator and its subtree
* with a return value op (placeholder op)
*/
parent_info = acpi_ps_get_opcode_info (op->common.parent->common.aml_opcode);
switch (parent_info->class) {
case AML_CLASS_CONTROL:
break;
case AML_CLASS_CREATE:
/*
* These opcodes contain term_arg operands. The current
* op must be replaced by a placeholder return op
*/
replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
if (!replacement_op) {
goto cleanup;
}
break;
case AML_CLASS_NAMED_OBJECT:
/*
* These opcodes contain term_arg operands. The current
* op must be replaced by a placeholder return op
*/
if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
(op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) ||
(op->common.parent->common.aml_opcode == AML_BUFFER_OP) ||
(op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
if (!replacement_op) {
goto cleanup;
}
}
if ((op->common.parent->common.aml_opcode == AML_NAME_OP) &&
(walk_state->descending_callback != acpi_ds_exec_begin_op)) {
if ((op->common.aml_opcode == AML_BUFFER_OP) ||
(op->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
replacement_op = acpi_ps_alloc_op (op->common.aml_opcode);
if (!replacement_op) {
goto cleanup;
}
replacement_op->named.data = op->named.data;
replacement_op->named.length = op->named.length;
}
}
break;
default:
replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
if (!replacement_op) {
goto cleanup;
}
}
/* We must unlink this op from the parent tree */
prev = op->common.parent->common.value.arg;
if (prev == op) {
/* This op is the first in the list */
if (replacement_op) {
replacement_op->common.parent = op->common.parent;
replacement_op->common.value.arg = NULL;
replacement_op->common.node = op->common.node;
op->common.parent->common.value.arg = replacement_op;
replacement_op->common.next = op->common.next;
}
else {
op->common.parent->common.value.arg = op->common.next;
}
}
/* Search the parent list */
else while (prev) {
/* Traverse all siblings in the parent's argument list */
next = prev->common.next;
if (next == op) {
if (replacement_op) {
replacement_op->common.parent = op->common.parent;
replacement_op->common.value.arg = NULL;
replacement_op->common.node = op->common.node;
prev->common.next = replacement_op;
replacement_op->common.next = op->common.next;
next = NULL;
}
else {
prev->common.next = op->common.next;
next = NULL;
}
}
prev = next;
}
}
cleanup:
/* Now we can actually delete the subtree rooted at Op */
acpi_ps_delete_parse_tree (op);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_next_parse_state
*
* PARAMETERS: walk_state - Current state
* Op - Current parse op
* callback_status - Status from previous operation
*
* RETURN: Status
*
* DESCRIPTION: Update the parser state based upon the return exception from
* the parser callback.
*
******************************************************************************/
static acpi_status
acpi_ps_next_parse_state (
struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
acpi_status callback_status)
{
struct acpi_parse_state *parser_state = &walk_state->parser_state;
acpi_status status = AE_CTRL_PENDING;
ACPI_FUNCTION_TRACE_PTR ("ps_next_parse_state", op);
switch (callback_status) {
case AE_CTRL_TERMINATE:
/*
* A control method was terminated via a RETURN statement.
* The walk of this method is complete.
*/
parser_state->aml = parser_state->aml_end;
status = AE_CTRL_TERMINATE;
break;
case AE_CTRL_BREAK:
parser_state->aml = walk_state->aml_last_while;
walk_state->control_state->common.value = FALSE;
status = AE_CTRL_BREAK;
break;
case AE_CTRL_CONTINUE:
parser_state->aml = walk_state->aml_last_while;
status = AE_CTRL_CONTINUE;
break;
case AE_CTRL_PENDING:
parser_state->aml = walk_state->aml_last_while;
break;
#if 0
case AE_CTRL_SKIP:
parser_state->aml = parser_state->scope->parse_scope.pkg_end;
status = AE_OK;
break;
#endif
case AE_CTRL_TRUE:
/*
* Predicate of an IF was true, and we are at the matching ELSE.
* Just close out this package
*/
parser_state->aml = acpi_ps_get_next_package_end (parser_state);
break;
case AE_CTRL_FALSE:
/*
* Either an IF/WHILE Predicate was false or we encountered a BREAK
* opcode. In both cases, we do not execute the rest of the
* package; We simply close out the parent (finishing the walk of
* this branch of the tree) and continue execution at the parent
* level.
*/
parser_state->aml = parser_state->scope->parse_scope.pkg_end;
/* In the case of a BREAK, just force a predicate (if any) to FALSE */
walk_state->control_state->common.value = FALSE;
status = AE_CTRL_END;
break;
case AE_CTRL_TRANSFER:
/* A method call (invocation) -- transfer control */
status = AE_CTRL_TRANSFER;
walk_state->prev_op = op;
walk_state->method_call_op = op;
walk_state->method_call_node = (op->common.value.arg)->common.node;
/* Will return value (if any) be used by the caller? */
walk_state->return_used = acpi_ds_is_result_used (op, walk_state);
break;
default:
status = callback_status;
if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
status = AE_OK;
}
break;
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_parse_loop
*
* PARAMETERS: walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
* a tree of ops.
*
******************************************************************************/
static acpi_status
acpi_ps_parse_loop (
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_parse_object *op = NULL; /* current op */
union acpi_parse_object *arg = NULL;
union acpi_parse_object *pre_op = NULL;
struct acpi_parse_state *parser_state;
u8 *aml_op_start = NULL;
ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state);
if (walk_state->descending_callback == NULL) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
parser_state = &walk_state->parser_state;
walk_state->arg_types = 0;
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
/* We are restarting a preempted control method */
if (acpi_ps_has_completed_scope (parser_state)) {
/*
* We must check if a predicate to an IF or WHILE statement
* was just completed
*/
if ((parser_state->scope->parse_scope.op) &&
((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) ||
(parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) &&
(walk_state->control_state) &&
(walk_state->control_state->common.state ==
ACPI_CONTROL_PREDICATE_EXECUTING)) {
/*
* A predicate was just completed, get the value of the
* predicate and branch based on that value
*/
walk_state->op = NULL;
status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE));
if (ACPI_FAILURE (status) &&
((status & AE_CODE_MASK) != AE_CODE_CONTROL)) {
if (status == AE_AML_NO_RETURN_VALUE) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Invoked method did not return a value, %s\n",
acpi_format_exception (status)));
}
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"get_predicate Failed, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
status = acpi_ps_next_parse_state (walk_state, op, status);
}
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
}
else if (walk_state->prev_op) {
/* We were in the middle of an op */
op = walk_state->prev_op;
walk_state->arg_types = walk_state->prev_arg_types;
}
}
#endif
/* Iterative parsing loop, while there is more AML to process: */
while ((parser_state->aml < parser_state->aml_end) || (op)) {
aml_op_start = parser_state->aml;
if (!op) {
/* Get the next opcode from the AML stream */
walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
parser_state->aml_start);
walk_state->opcode = acpi_ps_peek_opcode (parser_state);
/*
* First cut to determine what we have found:
* 1) A valid AML opcode
* 2) A name string
* 3) An unknown/invalid opcode
*/
walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
switch (walk_state->op_info->class) {
case AML_CLASS_ASCII:
case AML_CLASS_PREFIX:
/*
* Starts with a valid prefix or ASCII char, this is a name
* string. Convert the bare name string to a namepath.
*/
walk_state->opcode = AML_INT_NAMEPATH_OP;
walk_state->arg_types = ARGP_NAMESTRING;
break;
case AML_CLASS_UNKNOWN:
/* The opcode is unrecognized. Just skip unknown opcodes */
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Found unknown opcode %X at AML address %p offset %X, ignoring\n",
walk_state->opcode, parser_state->aml, walk_state->aml_offset));
ACPI_DUMP_BUFFER (parser_state->aml, 128);
/* Assume one-byte bad opcode */
parser_state->aml++;
continue;
default:
/* Found opcode info, this is a normal opcode */
parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode);
walk_state->arg_types = walk_state->op_info->parse_args;
break;
}
/* Create Op structure and append to parent's argument list */
if (walk_state->op_info->flags & AML_NAMED) {
/* Allocate a new pre_op if necessary */
if (!pre_op) {
pre_op = acpi_ps_alloc_op (walk_state->opcode);
if (!pre_op) {
status = AE_NO_MEMORY;
goto close_this_op;
}
}
pre_op->common.value.arg = NULL;
pre_op->common.aml_opcode = walk_state->opcode;
/*
* Get and append arguments until we find the node that contains
* the name (the type ARGP_NAME).
*/
while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
(GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) {
status = acpi_ps_get_next_arg (walk_state, parser_state,
GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
acpi_ps_append_arg (pre_op, arg);
INCREMENT_ARG_LIST (walk_state->arg_types);
}
/*
* Make sure that we found a NAME and didn't run out of
* arguments
*/
if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) {
status = AE_AML_NO_OPERAND;
goto close_this_op;
}
/* We know that this arg is a name, move to next arg */
INCREMENT_ARG_LIST (walk_state->arg_types);
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
walk_state->op = NULL;
status = walk_state->descending_callback (walk_state, &op);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"During name lookup/catalog, %s\n",
acpi_format_exception (status)));
goto close_this_op;
}
if (!op) {
continue;
}
status = acpi_ps_next_parse_state (walk_state, op, status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
acpi_ps_append_arg (op, pre_op->common.value.arg);
acpi_gbl_depth++;
if (op->common.aml_opcode == AML_REGION_OP) {
/*
* Defer final parsing of an operation_region body,
* because we don't have enough info in the first pass
* to parse it correctly (i.e., there may be method
* calls within the term_arg elements of the body.)
*
* However, we must continue parsing because
* the opregion is not a standalone package --
* we don't know where the end is at this point.
*
* (Length is unknown until parse of the body complete)
*/
op->named.data = aml_op_start;
op->named.length = 0;
}
}
else {
/* Not a named opcode, just allocate Op and append to parent */
walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
op = acpi_ps_alloc_op (walk_state->opcode);
if (!op) {
status = AE_NO_MEMORY;
goto close_this_op;
}
if (walk_state->op_info->flags & AML_CREATE) {
/*
* Backup to beginning of create_xXXfield declaration
* body_length is unknown until we parse the body
*/
op->named.data = aml_op_start;
op->named.length = 0;
}
acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op);
if ((walk_state->descending_callback != NULL)) {
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
walk_state->op = op;
status = walk_state->descending_callback (walk_state, &op);
status = acpi_ps_next_parse_state (walk_state, op, status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
}
}
op->common.aml_offset = walk_state->aml_offset;
if (walk_state->op_info) {
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
(u32) op->common.aml_opcode, walk_state->op_info->name,
op, parser_state->aml, op->common.aml_offset));
}
}
/*
* Start arg_count at zero because we don't know if there are
* any args yet
*/
walk_state->arg_count = 0;
/* Are there any arguments that must be processed? */
if (walk_state->arg_types) {
/* Get arguments */
switch (op->common.aml_opcode) {
case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
case AML_WORD_OP: /* AML_WORDDATA_ARG */
case AML_DWORD_OP: /* AML_DWORDATA_ARG */
case AML_QWORD_OP: /* AML_QWORDATA_ARG */
case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
/* Fill in constant or string argument directly */
acpi_ps_get_next_simple_arg (parser_state,
GET_CURRENT_ARG_TYPE (walk_state->arg_types), op);
break;
case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1);
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
walk_state->arg_types = 0;
break;
default:
/*
* Op is not a constant or string, append each argument
* to the Op
*/
while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
!walk_state->arg_count) {
walk_state->aml_offset = (u32)
ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start);
status = acpi_ps_get_next_arg (walk_state, parser_state,
GET_CURRENT_ARG_TYPE (walk_state->arg_types),
&arg);
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
if (arg) {
arg->common.aml_offset = walk_state->aml_offset;
acpi_ps_append_arg (op, arg);
}
INCREMENT_ARG_LIST (walk_state->arg_types);
}
/* Special processing for certain opcodes */
switch (op->common.aml_opcode) {
case AML_METHOD_OP:
/*
* Skip parsing of control method
* because we don't have enough info in the first pass
* to parse it correctly.
*
* Save the length and address of the body
*/
op->named.data = parser_state->aml;
op->named.length = (u32) (parser_state->pkg_end -
parser_state->aml);
/* Skip body of method */
parser_state->aml = parser_state->pkg_end;
walk_state->arg_count = 0;
break;
case AML_BUFFER_OP:
case AML_PACKAGE_OP:
case AML_VAR_PACKAGE_OP:
if ((op->common.parent) &&
(op->common.parent->common.aml_opcode == AML_NAME_OP) &&
(walk_state->descending_callback != acpi_ds_exec_begin_op)) {
/*
* Skip parsing of Buffers and Packages
* because we don't have enough info in the first pass
* to parse them correctly.
*/
op->named.data = aml_op_start;
op->named.length = (u32) (parser_state->pkg_end -
aml_op_start);
/* Skip body */
parser_state->aml = parser_state->pkg_end;
walk_state->arg_count = 0;
}
break;
case AML_WHILE_OP:
if (walk_state->control_state) {
walk_state->control_state->control.package_end =
parser_state->pkg_end;
}
break;
default:
/* No action for all other opcodes */
break;
}
break;
}
}
/* Check for arguments that need to be processed */
if (walk_state->arg_count) {
/*
* There are arguments (complex ones), push Op and
* prepare for argument
*/
status = acpi_ps_push_scope (parser_state, op,
walk_state->arg_types, walk_state->arg_count);
if (ACPI_FAILURE (status)) {
goto close_this_op;
}
op = NULL;
continue;
}
/*
* All arguments have been processed -- Op is complete,
* prepare for next
*/
walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
if (walk_state->op_info->flags & AML_NAMED) {
if (acpi_gbl_depth) {
acpi_gbl_depth--;
}
if (op->common.aml_opcode == AML_REGION_OP) {
/*
* Skip parsing of control method or opregion body,
* because we don't have enough info in the first pass
* to parse them correctly.
*
* Completed parsing an op_region declaration, we now
* know the length.
*/
op->named.length = (u32) (parser_state->aml - op->named.data);
}
}
if (walk_state->op_info->flags & AML_CREATE) {
/*
* Backup to beginning of create_xXXfield declaration (1 for
* Opcode)
*
* body_length is unknown until we parse the body
*/
op->named.length = (u32) (parser_state->aml - op->named.data);
}
/* This op complete, notify the dispatcher */
if (walk_state->ascending_callback != NULL) {
walk_state->op = op;
walk_state->opcode = op->common.aml_opcode;
status = walk_state->ascending_callback (walk_state);
status = acpi_ps_next_parse_state (walk_state, op, status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
}
close_this_op:
/*
* Finished one argument of the containing scope
*/
parser_state->scope->parse_scope.arg_count--;
/* Close this Op (will result in parse subtree deletion) */
acpi_ps_complete_this_op (walk_state, op);
op = NULL;
if (pre_op) {
acpi_ps_free_op (pre_op);
pre_op = NULL;
}
switch (status) {
case AE_OK:
break;
case AE_CTRL_TRANSFER:
/* We are about to transfer to a called method. */
walk_state->prev_op = op;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS (status);
case AE_CTRL_END:
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
if (op) {
walk_state->op = op;
walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
walk_state->opcode = op->common.aml_opcode;
status = walk_state->ascending_callback (walk_state);
status = acpi_ps_next_parse_state (walk_state, op, status);
acpi_ps_complete_this_op (walk_state, op);
op = NULL;
}
status = AE_OK;
break;
case AE_CTRL_BREAK:
case AE_CTRL_CONTINUE:
/* Pop off scopes until we find the While */
while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
}
/* Close this iteration of the While loop */
walk_state->op = op;
walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
walk_state->opcode = op->common.aml_opcode;
status = walk_state->ascending_callback (walk_state);
status = acpi_ps_next_parse_state (walk_state, op, status);
acpi_ps_complete_this_op (walk_state, op);
op = NULL;
status = AE_OK;
break;
case AE_CTRL_TERMINATE:
status = AE_OK;
/* Clean up */
do {
if (op) {
acpi_ps_complete_this_op (walk_state, op);
}
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
} while (op);
return_ACPI_STATUS (status);
default: /* All other non-AE_OK status */
do {
if (op) {
acpi_ps_complete_this_op (walk_state, op);
}
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
} while (op);
/*
* TBD: Cleanup parse ops on error
*/
#if 0
if (op == NULL) {
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
}
#endif
walk_state->prev_op = op;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS (status);
}
/* This scope complete? */
if (acpi_ps_has_completed_scope (parser_state)) {
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
}
else {
op = NULL;
}
} /* while parser_state->Aml */
/*
* Complete the last Op (if not completed), and clear the scope stack.
* It is easily possible to end an AML "package" with an unbounded number
* of open scopes (such as when several ASL blocks are closed with
* sequential closing braces). We want to terminate each one cleanly.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op));
do {
if (op) {
if (walk_state->ascending_callback != NULL) {
walk_state->op = op;
walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
walk_state->opcode = op->common.aml_opcode;
status = walk_state->ascending_callback (walk_state);
status = acpi_ps_next_parse_state (walk_state, op, status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
/* Clean up */
do {
if (op) {
acpi_ps_complete_this_op (walk_state, op);
}
acpi_ps_pop_scope (parser_state, &op,
&walk_state->arg_types, &walk_state->arg_count);
} while (op);
return_ACPI_STATUS (status);
}
else if (ACPI_FAILURE (status)) {
acpi_ps_complete_this_op (walk_state, op);
return_ACPI_STATUS (status);
}
}
acpi_ps_complete_this_op (walk_state, op);
}
acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types,
&walk_state->arg_count);
} while (op);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_parse_aml
*
* PARAMETERS: walk_state - Current state
*
*
* RETURN: Status
*
* DESCRIPTION: Parse raw AML and return a tree of ops
*
******************************************************************************/
acpi_status
acpi_ps_parse_aml (
struct acpi_walk_state *walk_state)
{
acpi_status status;
acpi_status terminate_status;
struct acpi_thread_state *thread;
struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
struct acpi_walk_state *previous_walk_state;
ACPI_FUNCTION_TRACE ("ps_parse_aml");
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Entered with walk_state=%p Aml=%p size=%X\n",
walk_state, walk_state->parser_state.aml,
walk_state->parser_state.aml_size));
/* Create and initialize a new thread state */
thread = acpi_ut_create_thread_state ();
if (!thread) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
walk_state->thread = thread;
acpi_ds_push_walk_state (walk_state, thread);
/*
* This global allows the AML debugger to get a handle to the currently
* executing control method.
*/
acpi_gbl_current_walk_list = thread;
/*
* Execute the walk loop as long as there is a valid Walk State. This
* handles nested control method invocations without recursion.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", walk_state));
status = AE_OK;
while (walk_state) {
if (ACPI_SUCCESS (status)) {
/*
* The parse_loop executes AML until the method terminates
* or calls another method.
*/
status = acpi_ps_parse_loop (walk_state);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Completed one call to walk loop, %s State=%p\n",
acpi_format_exception (status), walk_state));
if (status == AE_CTRL_TRANSFER) {
/*
* A method call was detected.
* Transfer control to the called control method
*/
status = acpi_ds_call_control_method (thread, walk_state, NULL);
/*
* If the transfer to the new method method call worked, a new walk
* state was created -- get it
*/
walk_state = acpi_ds_get_current_walk_state (thread);
continue;
}
else if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
}
else if ((status != AE_OK) && (walk_state->method_desc)) {
ACPI_REPORT_METHOD_ERROR ("Method execution failed",
walk_state->method_node, NULL, status);
/* Check for possible multi-thread reentrancy problem */
if ((status == AE_ALREADY_EXISTS) &&
(!walk_state->method_desc->method.semaphore)) {
/*
* This method is marked not_serialized, but it tried to create
* a named object, causing the second thread entrance to fail.
* We will workaround this by marking the method permanently
* as Serialized.
*/
walk_state->method_desc->method.method_flags |= AML_METHOD_SERIALIZED;
walk_state->method_desc->method.concurrency = 1;
}
}
if (walk_state->method_desc) {
/* Decrement the thread count on the method parse tree */
if (walk_state->method_desc->method.thread_count) {
walk_state->method_desc->method.thread_count--;
}
}
/* We are done with this walk, move on to the parent if any */
walk_state = acpi_ds_pop_walk_state (thread);
/* Reset the current scope to the beginning of scope stack */
acpi_ds_scope_stack_clear (walk_state);
/*
* If we just returned from the execution of a control method,
* there's lots of cleanup to do
*/
if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) {
terminate_status = acpi_ds_terminate_control_method (walk_state);
if (ACPI_FAILURE (terminate_status)) {
ACPI_REPORT_ERROR ((
"Could not terminate control method properly\n"));
/* Ignore error and continue */
}
}
/* Delete this walk state and all linked control states */
acpi_ps_cleanup_scope (&walk_state->parser_state);
previous_walk_state = walk_state;
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"return_value=%p, implicit_value=%p State=%p\n",
walk_state->return_desc, walk_state->implicit_return_obj, walk_state));
/* Check if we have restarted a preempted walk */
walk_state = acpi_ds_get_current_walk_state (thread);
if (walk_state) {
if (ACPI_SUCCESS (status)) {
/*
* There is another walk state, restart it.
* If the method return value is not used by the parent,
* The object is deleted
*/
if (!previous_walk_state->return_desc) {
status = acpi_ds_restart_control_method (walk_state,
previous_walk_state->implicit_return_obj);
}
else {
/*
* We have a valid return value, delete any implicit
* return value.
*/
acpi_ds_clear_implicit_return (previous_walk_state);
status = acpi_ds_restart_control_method (walk_state,
previous_walk_state->return_desc);
}
if (ACPI_SUCCESS (status)) {
walk_state->walk_type |= ACPI_WALK_METHOD_RESTART;
}
}
else {
/* On error, delete any return object */
acpi_ut_remove_reference (previous_walk_state->return_desc);
}
}
/*
* Just completed a 1st-level method, save the final internal return
* value (if any)
*/
else if (previous_walk_state->caller_return_desc) {
if (previous_walk_state->implicit_return_obj) {
*(previous_walk_state->caller_return_desc) =
previous_walk_state->implicit_return_obj;
}
else {
/* NULL if no return value */
*(previous_walk_state->caller_return_desc) =
previous_walk_state->return_desc;
}
}
else {
if (previous_walk_state->return_desc) {
/* Caller doesn't want it, must delete it */
acpi_ut_remove_reference (previous_walk_state->return_desc);
}
if (previous_walk_state->implicit_return_obj) {
/* Caller doesn't want it, must delete it */
acpi_ut_remove_reference (previous_walk_state->implicit_return_obj);
}
}
acpi_ds_delete_walk_state (previous_walk_state);
}
/* Normal exit */
acpi_ex_release_all_mutexes (thread);
acpi_ut_delete_generic_state (ACPI_CAST_PTR (union acpi_generic_state, thread));
acpi_gbl_current_walk_list = prev_walk_list;
return_ACPI_STATUS (status);
}
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