Viewing file:  psparse.c (29.18 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/******************************************************************************
*
* Module Name: psparse - Parser top level AML parse routines
* $Revision: 104 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* 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.h"
#include "acparser.h"
#include "acdispat.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acdebug.h"
#include "acinterp.h"
#define _COMPONENT ACPI_PARSER
MODULE_NAME ("psparse")
u32 acpi_gbl_depth = 0;
extern u32 acpi_gbl_scope_depth;
/*******************************************************************************
*
* 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.
*
******************************************************************************/
static 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: Status
*
* DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
*
******************************************************************************/
u16
acpi_ps_peek_opcode (
acpi_parse_state *parser_state)
{
u8 *aml;
u16 opcode;
aml = parser_state->aml;
opcode = (u16) GET8 (aml);
aml++;
/*
* Original code special cased LNOTEQUAL, LLESSEQUAL, LGREATEREQUAL.
* These opcodes are no longer recognized. Instead, they are broken into
* two opcodes.
*
*
* if (Opcode == AML_EXTOP
* || (Opcode == AML_LNOT
* && (GET8 (Aml) == AML_LEQUAL
* || GET8 (Aml) == AML_LGREATER
* || GET8 (Aml) == AML_LLESS)))
*
* extended Opcode, !=, <=, or >=
*/
if (opcode == AML_EXTOP) {
/* Extended opcode */
opcode = (u16) ((opcode << 8) | GET8 (aml));
}
return (opcode);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ps_find_object
*
* PARAMETERS: Opcode - Current opcode
* Parser_state - Current state
* Walk_state - Current state
* *Op - Where found/new op is returned
*
* RETURN: Status
*
* DESCRIPTION: Find a named object. Two versions - one to search the parse
* tree (for parser-only applications such as acpidump), another
* to search the ACPI internal namespace (the parse tree may no
* longer exist)
*
******************************************************************************/
#ifdef PARSER_ONLY
acpi_status
acpi_ps_find_object (
acpi_walk_state *walk_state,
acpi_parse_object **out_op)
{
NATIVE_CHAR *path;
/* We are only interested in opcodes that have an associated name */
if (!(walk_state->op_info->flags & AML_NAMED)) {
*out_op = walk_state->op;
return (AE_OK);
}
/* Find the name in the parse tree */
path = acpi_ps_get_next_namestring (&walk_state->parser_state);
*out_op = acpi_ps_find (acpi_ps_get_parent_scope (&walk_state->parser_state),
path, walk_state->opcode, 1);
if (!(*out_op)) {
return (AE_NOT_FOUND);
}
return (AE_OK);
}
#endif
/*******************************************************************************
*
* FUNCTION: Acpi_ps_complete_this_op
*
* PARAMETERS: Walk_state - Current State
* Op - Op to complete
*
* RETURN: TRUE if Op and subtree was deleted
*
* DESCRIPTION: Perform any cleanup at the completion of an Op.
*
******************************************************************************/
static u8
acpi_ps_complete_this_op (
acpi_walk_state *walk_state,
acpi_parse_object *op)
{
#ifndef PARSER_ONLY
acpi_parse_object *prev;
acpi_parse_object *next;
const acpi_opcode_info *parent_info;
acpi_parse_object *replacement_op = NULL;
FUNCTION_TRACE_PTR ("Ps_complete_this_op", op);
/* 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)) {
/* Make sure that we only delete this subtree */
if (op->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->parent->opcode);
switch (parent_info->class) {
case AML_CLASS_CONTROL: /* IF, ELSE, WHILE only */
break;
case AML_CLASS_NAMED_OBJECT: /* Scope, method, etc. */
case AML_CLASS_CREATE:
/*
* These opcodes contain Term_arg operands. The current
* op must be replace by a placeholder return op
*/
if ((op->parent->opcode == AML_REGION_OP) ||
(op->parent->opcode == AML_CREATE_FIELD_OP) ||
(op->parent->opcode == AML_CREATE_BIT_FIELD_OP) ||
(op->parent->opcode == AML_CREATE_BYTE_FIELD_OP) ||
(op->parent->opcode == AML_CREATE_WORD_FIELD_OP) ||
(op->parent->opcode == AML_CREATE_DWORD_FIELD_OP) ||
(op->parent->opcode == AML_CREATE_QWORD_FIELD_OP)) {
replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
if (!replacement_op) {
return_VALUE (FALSE);
}
}
break;
default:
replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
if (!replacement_op) {
return_VALUE (FALSE);
}
}
/* We must unlink this op from the parent tree */
prev = op->parent->value.arg;
if (prev == op) {
/* This op is the first in the list */
if (replacement_op) {
replacement_op->parent = op->parent;
replacement_op->value.arg = NULL;
op->parent->value.arg = replacement_op;
replacement_op->next = op->next;
}
else {
op->parent->value.arg = op->next;
}
}
/* Search the parent list */
else while (prev) {
/* Traverse all siblings in the parent's argument list */
next = prev->next;
if (next == op) {
if (replacement_op) {
replacement_op->parent = op->parent;
replacement_op->value.arg = NULL;
prev->next = replacement_op;
replacement_op->next = op->next;
next = NULL;
}
else {
prev->next = op->next;
next = NULL;
}
}
prev = next;
}
}
/* Now we can actually delete the subtree rooted at op */
acpi_ps_delete_parse_tree (op);
return_VALUE (TRUE);
}
return_VALUE (FALSE);
#else
return (FALSE);
#endif
}
/*******************************************************************************
*
* FUNCTION: Acpi_ps_next_parse_state
*
* PARAMETERS: Parser_state - Current parser state object
*
* RETURN:
*
* DESCRIPTION:
*
******************************************************************************/
static acpi_status
acpi_ps_next_parse_state (
acpi_walk_state *walk_state,
acpi_parse_object *op,
acpi_status callback_status)
{
acpi_parse_state *parser_state = &walk_state->parser_state;
acpi_status status = AE_CTRL_PENDING;
u8 *start;
u32 package_length;
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_PENDING:
/*
* Predicate of a WHILE was true and the loop just completed an
* execution. Go back to the start of the loop and reevaluate the
* predicate.
*/
/* TBD: How to handle a break within a while. */
/* This code attempts it */
parser_state->aml = walk_state->aml_last_while;
break;
case AE_CTRL_TRUE:
/*
* Predicate of an IF was true, and we are at the matching ELSE.
* Just close out this package
*
* Note: Parser_state->Aml is modified by the package length procedure
* TBD: [Investigate] perhaps it shouldn't, too much trouble
*/
start = parser_state->aml;
package_length = acpi_ps_get_next_package_length (parser_state);
parser_state->aml = start + package_length;
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->value.arg)->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: Parser_state - Current parser state object
*
* RETURN: Status
*
* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
* a tree of ops.
*
******************************************************************************/
acpi_status
acpi_ps_parse_loop (
acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
acpi_parse_object *op = NULL; /* current op */
acpi_parse_object *arg = NULL;
acpi_parse_object pre_op;
acpi_parse_state *parser_state;
u8 *aml_op_start;
FUNCTION_TRACE_PTR ("Ps_parse_loop", walk_state);
parser_state = &walk_state->parser_state;
walk_state->arg_types = 0;
#ifndef PARSER_ONLY
if (walk_state->walk_type & 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->opcode == AML_IF_OP) ||
(parser_state->scope->parse_scope.op->opcode == AML_WHILE_OP)) &&
(walk_state->control_state) &&
(walk_state->control_state->common.state ==
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, 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)) {
if (!op) {
/* Get the next opcode from the AML stream */
aml_op_start = parser_state->aml;
walk_state->aml_offset = 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 offset %X, ignoring\n",
walk_state->opcode, walk_state->aml_offset));
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) {
pre_op.value.arg = NULL;
pre_op.opcode = walk_state->opcode;
while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME) {
arg = acpi_ps_get_next_arg (parser_state,
GET_CURRENT_ARG_TYPE (walk_state->arg_types),
&walk_state->arg_count);
acpi_ps_append_arg (&pre_op, arg);
INCREMENT_ARG_LIST (walk_state->arg_types);
}
/* We know that this arg is a name, move to next arg */
INCREMENT_ARG_LIST (walk_state->arg_types);
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 = NULL;
status = walk_state->descending_callback (walk_state, &op);
/* TBD: check status here? */
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 == NULL) {
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.value.arg);
acpi_gbl_depth++;
if (op->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)
*/
((acpi_parse2_object * ) op)->data = aml_op_start;
((acpi_parse2_object * ) op)->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) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
if (walk_state->op_info->flags & AML_CREATE) {
/*
* Backup to beginning of Create_xXXfield declaration
* Body_length is unknown until we parse the body
*/
((acpi_parse2_object * ) op)->data = aml_op_start;
((acpi_parse2_object * ) op)->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->aml_offset = walk_state->aml_offset;
if (walk_state->op_info) {
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Op=%p Opcode=%4.4X Aml %p Oft=%5.5X\n",
op, op->opcode, parser_state->aml, op->aml_offset));
}
}
/* Start Arg_count at zero because we don't know if there are any args yet */
walk_state->arg_count = 0;
if (walk_state->arg_types) /* Are there any arguments that must be processed? */ {
/* get arguments */
switch (op->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 */
acpi_ps_get_next_namepath (parser_state, op, &walk_state->arg_count, 1);
walk_state->arg_types = 0;
break;
default:
/* Op is not a constant or string, append each argument */
while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) && !walk_state->arg_count) {
walk_state->aml_offset = parser_state->aml - parser_state->aml_start;
arg = acpi_ps_get_next_arg (parser_state,
GET_CURRENT_ARG_TYPE (walk_state->arg_types),
&walk_state->arg_count);
if (arg) {
arg->aml_offset = walk_state->aml_offset;
acpi_ps_append_arg (op, arg);
}
INCREMENT_ARG_LIST (walk_state->arg_types);
}
/* For a method, save the length and address of the body */
if (op->opcode == AML_METHOD_OP) {
/*
* Skip parsing of control method or opregion body,
* because we don't have enough info in the first pass
* to parse them correctly.
*/
((acpi_parse2_object * ) op)->data = parser_state->aml;
((acpi_parse2_object * ) op)->length = (u32) (parser_state->pkg_end -
parser_state->aml);
/*
* Skip body of method. For Op_regions, we must continue
* parsing because the opregion is not a standalone
* package (We don't know where the end is).
*/
parser_state->aml = parser_state->pkg_end;
walk_state->arg_count = 0;
}
break;
}
}
/*
* Zero Arg_count means that all arguments for this op have been processed
*/
if (!walk_state->arg_count) {
/* completed Op, prepare for next */
walk_state->op_info = acpi_ps_get_opcode_info (op->opcode);
if (walk_state->op_info->flags & AML_NAMED) {
if (acpi_gbl_depth) {
acpi_gbl_depth--;
}
if (op->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.
*/
((acpi_parse2_object * ) op)->length = (u32) (parser_state->aml -
((acpi_parse2_object * ) op)->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
*/
((acpi_parse2_object * ) op)->length = (u32) (parser_state->aml -
((acpi_parse2_object * ) op)->data);
}
/* This op complete, notify the dispatcher */
if (walk_state->ascending_callback != NULL) {
walk_state->op = op;
walk_state->opcode = op->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 (may result in parse subtree deletion) */
if (acpi_ps_complete_this_op (walk_state, op)) {
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);
break;
case AE_CTRL_END:
acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count);
walk_state->op = op;
walk_state->op_info = acpi_ps_get_opcode_info (op->opcode);
walk_state->opcode = op->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);
break;
default: /* All other non-AE_OK status */
if (op == NULL) {
acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count);
}
walk_state->prev_op = op;
walk_state->prev_arg_types = walk_state->arg_types;
/*
* TEMP:
*/
return_ACPI_STATUS (status);
break;
}
/* 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;
}
}
/* Arg_count is non-zero */
else {
/* complex argument, push Op and prepare for argument */
acpi_ps_push_scope (parser_state, op, walk_state->arg_types, walk_state->arg_count);
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->opcode);
walk_state->opcode = op->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: Start_scope - The starting point of the parse. Becomes the
* root of the parsed op tree.
* Aml - Pointer to the raw AML code to parse
* Aml_size - Length of the AML to parse
*
*
* RETURN: Status
*
* DESCRIPTION: Parse raw AML and return a tree of ops
*
******************************************************************************/
acpi_status
acpi_ps_parse_aml (
acpi_walk_state *walk_state)
{
acpi_status status;
acpi_walk_list walk_list;
acpi_walk_list *prev_walk_list = acpi_gbl_current_walk_list;
acpi_walk_state *previous_walk_state;
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 walk list */
walk_list.walk_state = NULL;
walk_list.acquired_mutex_list.prev = NULL;
walk_list.acquired_mutex_list.next = NULL;
walk_state->walk_list = &walk_list;
acpi_ds_push_walk_state (walk_state, &walk_list);
/* TBD: [Restructure] TEMP until we pass Walk_state to the interpreter
*/
acpi_gbl_current_walk_list = &walk_list;
/*
* 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, State=%p\n", 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 (&walk_list, 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 (&walk_list);
continue;
}
else if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
}
/* We are done with this walk, move on to the parent if any */
walk_state = acpi_ds_pop_walk_state (&walk_list);
/* 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) {
acpi_ds_terminate_control_method (walk_state);
}
/* 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, State=%p\n",
walk_state->return_desc, walk_state));
/* Check if we have restarted a preempted walk */
walk_state = acpi_ds_get_current_walk_state (&walk_list);
if (walk_state) {
if (ACPI_SUCCESS (status)) {
/* There is another walk state, restart it */
/*
* If the method returned value is not used by the parent,
* The object is deleted
*/
acpi_ds_restart_control_method (walk_state, previous_walk_state->return_desc);
walk_state->walk_type |= WALK_METHOD_RESTART;
}
}
/*
* Just completed a 1st-level method, save the final internal return
* value (if any)
*/
else if (previous_walk_state->caller_return_desc) {
*(previous_walk_state->caller_return_desc) = previous_walk_state->return_desc; /* NULL if no return value */
}
else if (previous_walk_state->return_desc) {
/* Caller doesn't want it, must delete it */
acpi_ut_remove_reference (previous_walk_state->return_desc);
}
acpi_ds_delete_walk_state (previous_walk_state);
}
/* Normal exit */
acpi_ex_release_all_mutexes ((acpi_operand_object *) &walk_list.acquired_mutex_list);
acpi_gbl_current_walk_list = prev_walk_list;
return_ACPI_STATUS (status);
}
|