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linux/drivers/acpi/acpica/psloop.c
Lin Ming 7f0c826a43 ACPICA: Add support for module-level executable AML code 
Add limited support for executable AML code that exists outside
of any control method. This type of code has been illegal since
ACPI 2.0.  The code must exist in an If/Else/While block. All AML
tables are supported, including tables that are dynamically loaded.
ACPICA BZ 762.

http://acpica.org/bugzilla/show_bug.cgi?id=762

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-08-28 19:40:39 -04:00

1192 lines
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/******************************************************************************
*
* Module Name: psloop - Main AML parse loop
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, 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.
*/
/*
* Parse the AML and build an operation tree as most interpreters, (such as
* Perl) do. Parsing is done by hand rather than with a YACC generated parser
* to tightly constrain stack and dynamic memory usage. 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 "accommon.h"
#include "acparser.h"
#include "acdispat.h"
#include "amlcode.h"
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME("psloop")
static u32 acpi_gbl_depth = 0;
/* Local prototypes */
static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
static acpi_status
acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
u8 * aml_op_start,
union acpi_parse_object *unnamed_op,
union acpi_parse_object **op);
static acpi_status
acpi_ps_create_op(struct acpi_walk_state *walk_state,
u8 * aml_op_start, union acpi_parse_object **new_op);
static acpi_status
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
u8 * aml_op_start, union acpi_parse_object *op);
static acpi_status
acpi_ps_complete_op(struct acpi_walk_state *walk_state,
union acpi_parse_object **op, acpi_status status);
static acpi_status
acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
union acpi_parse_object *op, acpi_status status);
static void
acpi_ps_link_module_code(u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);
/*******************************************************************************
*
* FUNCTION: acpi_ps_get_aml_opcode
*
* PARAMETERS: walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Extract the next AML opcode from the input stream.
*
******************************************************************************/
static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
{
ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
walk_state->aml_offset =
(u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
walk_state->parser_state.aml_start);
walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->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_ERROR((AE_INFO,
"Found unknown opcode %X at AML address %p offset %X, ignoring",
walk_state->opcode, walk_state->parser_state.aml,
walk_state->aml_offset));
ACPI_DUMP_BUFFER(walk_state->parser_state.aml, 128);
/* Assume one-byte bad opcode */
walk_state->parser_state.aml++;
return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
default:
/* Found opcode info, this is a normal opcode */
walk_state->parser_state.aml +=
acpi_ps_get_opcode_size(walk_state->opcode);
walk_state->arg_types = walk_state->op_info->parse_args;
break;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_build_named_op
*
* PARAMETERS: walk_state - Current state
* aml_op_start - Begin of named Op in AML
* unnamed_op - Early Op (not a named Op)
* Op - Returned Op
*
* RETURN: Status
*
* DESCRIPTION: Parse a named Op
*
******************************************************************************/
static acpi_status
acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
u8 * aml_op_start,
union acpi_parse_object *unnamed_op,
union acpi_parse_object **op)
{
acpi_status status = AE_OK;
union acpi_parse_object *arg = NULL;
ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
unnamed_op->common.value.arg = NULL;
unnamed_op->common.arg_list_length = 0;
unnamed_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,
&(walk_state->parser_state),
GET_CURRENT_ARG_TYPE(walk_state->
arg_types), &arg);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_ps_append_arg(unnamed_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)) {
return_ACPI_STATUS(AE_AML_NO_OPERAND);
}
/* 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_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
return_ACPI_STATUS(status);
}
if (!*op) {
return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
}
status = acpi_ps_next_parse_state(walk_state, *op, status);
if (ACPI_FAILURE(status)) {
if (status == AE_CTRL_PENDING) {
return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
}
return_ACPI_STATUS(status);
}
acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
acpi_gbl_depth++;
if ((*op)->common.aml_opcode == AML_REGION_OP ||
(*op)->common.aml_opcode == AML_DATA_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;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_create_op
*
* PARAMETERS: walk_state - Current state
* aml_op_start - Op start in AML
* new_op - Returned Op
*
* RETURN: Status
*
* DESCRIPTION: Get Op from AML
*
******************************************************************************/
static acpi_status
acpi_ps_create_op(struct acpi_walk_state *walk_state,
u8 * aml_op_start, union acpi_parse_object **new_op)
{
acpi_status status = AE_OK;
union acpi_parse_object *op;
union acpi_parse_object *named_op = NULL;
union acpi_parse_object *parent_scope;
u8 argument_count;
const struct acpi_opcode_info *op_info;
ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
status = acpi_ps_get_aml_opcode(walk_state);
if (status == AE_CTRL_PARSE_CONTINUE) {
return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
}
/* Create Op structure and append to parent's argument list */
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_NAMED) {
status =
acpi_ps_build_named_op(walk_state, aml_op_start, op,
&named_op);
acpi_ps_free_op(op);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
*new_op = named_op;
return_ACPI_STATUS(AE_OK);
}
/* Not a named opcode, just allocate Op and append to parent */
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;
}
if (walk_state->opcode == AML_BANK_FIELD_OP) {
/*
* Backup to beginning of bank_field declaration
* body_length is unknown until we parse the body
*/
op->named.data = aml_op_start;
op->named.length = 0;
}
parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
acpi_ps_append_arg(parent_scope, op);
if (parent_scope) {
op_info =
acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
if (op_info->flags & AML_HAS_TARGET) {
argument_count =
acpi_ps_get_argument_count(op_info->type);
if (parent_scope->common.arg_list_length >
argument_count) {
op->common.flags |= ACPI_PARSEOP_TARGET;
}
} else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
op->common.flags |= ACPI_PARSEOP_TARGET;
}
}
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 = *new_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_CTRL_PARSE_PENDING;
}
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_get_arguments
*
* PARAMETERS: walk_state - Current state
* aml_op_start - Op start in AML
* Op - Current Op
*
* RETURN: Status
*
* DESCRIPTION: Get arguments for passed Op.
*
******************************************************************************/
static acpi_status
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
u8 * aml_op_start, union acpi_parse_object *op)
{
acpi_status status = AE_OK;
union acpi_parse_object *arg = NULL;
const struct acpi_opcode_info *op_info;
ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
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(&(walk_state->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,
&(walk_state->parser_state), op,
1);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
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(walk_state->parser_state.aml,
walk_state->parser_state.
aml_start);
status =
acpi_ps_get_next_arg(walk_state,
&(walk_state->parser_state),
GET_CURRENT_ARG_TYPE
(walk_state->arg_types), &arg);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (arg) {
arg->common.aml_offset = walk_state->aml_offset;
acpi_ps_append_arg(op, arg);
}
INCREMENT_ARG_LIST(walk_state->arg_types);
}
/*
* Handle executable code at "module-level". This refers to
* executable opcodes that appear outside of any control method.
*/
if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
/*
* We want to skip If/Else/While constructs during Pass1 because we
* want to actually conditionally execute the code during Pass2.
*
* Except for disassembly, where we always want to walk the
* If/Else/While packages
*/
switch (op->common.aml_opcode) {
case AML_IF_OP:
case AML_ELSE_OP:
case AML_WHILE_OP:
/*
* Currently supported module-level opcodes are:
* IF/ELSE/WHILE. These appear to be the most common,
* and easiest to support since they open an AML
* package.
*/
if (walk_state->pass_number ==
ACPI_IMODE_LOAD_PASS1) {
acpi_ps_link_module_code(aml_op_start,
walk_state->
parser_state.
pkg_end -
aml_op_start,
walk_state->
owner_id);
}
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
"Pass1: Skipping an If/Else/While body\n"));
/* Skip body of if/else/while in pass 1 */
walk_state->parser_state.aml =
walk_state->parser_state.pkg_end;
walk_state->arg_count = 0;
break;
default:
/*
* Check for an unsupported executable opcode at module
* level. We must be in PASS1, the parent must be a SCOPE,
* The opcode class must be EXECUTE, and the opcode must
* not be an argument to another opcode.
*/
if ((walk_state->pass_number ==
ACPI_IMODE_LOAD_PASS1)
&& (op->common.parent->common.aml_opcode ==
AML_SCOPE_OP)) {
op_info =
acpi_ps_get_opcode_info(op->common.
aml_opcode);
if ((op_info->class ==
AML_CLASS_EXECUTE) && (!arg)) {
ACPI_WARNING((AE_INFO,
"Detected an unsupported executable opcode "
"at module-level: [0x%.4X] at table offset 0x%.4X",
op->common.aml_opcode,
(u32)((aml_op_start - walk_state->parser_state.aml_start)
+ sizeof(struct acpi_table_header))));
}
}
break;
}
}
/* 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 = walk_state->parser_state.aml;
op->named.length = (u32)
(walk_state->parser_state.pkg_end -
walk_state->parser_state.aml);
/* Skip body of method */
walk_state->parser_state.aml =
walk_state->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->pass_number <=
ACPI_IMODE_LOAD_PASS2)) {
/*
* 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)
(walk_state->parser_state.pkg_end -
aml_op_start);
/* Skip body */
walk_state->parser_state.aml =
walk_state->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 =
walk_state->parser_state.pkg_end;
}
break;
default:
/* No action for all other opcodes */
break;
}
break;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_link_module_code
*
* PARAMETERS: aml_start - Pointer to the AML
* aml_length - Length of executable AML
* owner_id - owner_id of module level code
*
* RETURN: None.
*
* DESCRIPTION: Wrap the module-level code with a method object and link the
* object to the global list. Note, the mutex field of the method
* object is used to link multiple module-level code objects.
*
******************************************************************************/
static void
acpi_ps_link_module_code(u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
{
union acpi_operand_object *prev;
union acpi_operand_object *next;
union acpi_operand_object *method_obj;
/* Get the tail of the list */
prev = next = acpi_gbl_module_code_list;
while (next) {
prev = next;
next = next->method.mutex;
}
/*
* Insert the module level code into the list. Merge it if it is
* adjacent to the previous element.
*/
if (!prev ||
((prev->method.aml_start + prev->method.aml_length) != aml_start)) {
/* Create, initialize, and link a new temporary method object */
method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
if (!method_obj) {
return;
}
method_obj->method.aml_start = aml_start;
method_obj->method.aml_length = aml_length;
method_obj->method.owner_id = owner_id;
method_obj->method.flags |= AOPOBJ_MODULE_LEVEL;
if (!prev) {
acpi_gbl_module_code_list = method_obj;
} else {
prev->method.mutex = method_obj;
}
} else {
prev->method.aml_length += aml_length;
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_complete_op
*
* PARAMETERS: walk_state - Current state
* Op - Returned Op
* Status - Parse status before complete Op
*
* RETURN: Status
*
* DESCRIPTION: Complete Op
*
******************************************************************************/
static acpi_status
acpi_ps_complete_op(struct acpi_walk_state *walk_state,
union acpi_parse_object **op, acpi_status status)
{
acpi_status status2;
ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
/*
* Finished one argument of the containing scope
*/
walk_state->parser_state.scope->parse_scope.arg_count--;
/* Close this Op (will result in parse subtree deletion) */
status2 = acpi_ps_complete_this_op(walk_state, *op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
*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 = NULL;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS(status);
case AE_CTRL_END:
acpi_ps_pop_scope(&(walk_state->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);
status2 = acpi_ps_complete_this_op(walk_state, *op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
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(&(walk_state->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);
status2 = acpi_ps_complete_this_op(walk_state, *op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
status = AE_OK;
break;
case AE_CTRL_TERMINATE:
/* Clean up */
do {
if (*op) {
status2 =
acpi_ps_complete_this_op(walk_state, *op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
acpi_ut_delete_generic_state
(acpi_ut_pop_generic_state
(&walk_state->control_state));
}
acpi_ps_pop_scope(&(walk_state->parser_state), op,
&walk_state->arg_types,
&walk_state->arg_count);
} while (*op);
return_ACPI_STATUS(AE_OK);
default: /* All other non-AE_OK status */
do {
if (*op) {
status2 =
acpi_ps_complete_this_op(walk_state, *op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
acpi_ps_pop_scope(&(walk_state->parser_state), op,
&walk_state->arg_types,
&walk_state->arg_count);
} while (*op);
#if 0
/*
* TBD: Cleanup parse ops on error
*/
if (*op == NULL) {
acpi_ps_pop_scope(parser_state, op,
&walk_state->arg_types,
&walk_state->arg_count);
}
#endif
walk_state->prev_op = NULL;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS(status);
}
/* This scope complete? */
if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
acpi_ps_pop_scope(&(walk_state->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;
}
ACPI_PREEMPTION_POINT();
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ps_complete_final_op
*
* PARAMETERS: walk_state - Current state
* Op - Current Op
* Status - Current parse status before complete last
* Op
*
* RETURN: Status
*
* DESCRIPTION: Complete last Op.
*
******************************************************************************/
static acpi_status
acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
union acpi_parse_object *op, acpi_status status)
{
acpi_status status2;
ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
/*
* 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 =
acpi_ps_complete_op(walk_state, &op,
AE_OK);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
/* Clean up */
do {
if (op) {
status2 =
acpi_ps_complete_this_op
(walk_state, op);
if (ACPI_FAILURE
(status2)) {
return_ACPI_STATUS
(status2);
}
}
acpi_ps_pop_scope(&
(walk_state->
parser_state),
&op,
&walk_state->
arg_types,
&walk_state->
arg_count);
} while (op);
return_ACPI_STATUS(status);
}
else if (ACPI_FAILURE(status)) {
/* First error is most important */
(void)
acpi_ps_complete_this_op(walk_state,
op);
return_ACPI_STATUS(status);
}
}
status2 = acpi_ps_complete_this_op(walk_state, op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
acpi_ps_pop_scope(&(walk_state->parser_state), &op,
&walk_state->arg_types,
&walk_state->arg_count);
} while (op);
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.
*
******************************************************************************/
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 */
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_EXCEPTION((AE_INFO, status,
"Invoked method did not return a value"));
}
ACPI_EXCEPTION((AE_INFO, status,
"GetPredicate Failed"));
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) {
status =
acpi_ps_create_op(walk_state, aml_op_start, &op);
if (ACPI_FAILURE(status)) {
if (status == AE_CTRL_PARSE_CONTINUE) {
continue;
}
if (status == AE_CTRL_PARSE_PENDING) {
status = AE_OK;
}
status =
acpi_ps_complete_op(walk_state, &op,
status);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
continue;
}
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 AmlOffset %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 */
status =
acpi_ps_get_arguments(walk_state, aml_op_start, op);
if (ACPI_FAILURE(status)) {
status =
acpi_ps_complete_op(walk_state, &op,
status);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
continue;
}
}
/* 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)) {
status =
acpi_ps_complete_op(walk_state, &op,
status);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
continue;
}
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 ||
op->common.aml_opcode == AML_DATA_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);
}
if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
/*
* Backup to beginning of bank_field declaration
*
* 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;
}
}
status = acpi_ps_complete_op(walk_state, &op, status);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
} /* while parser_state->Aml */
status = acpi_ps_complete_final_op(walk_state, op, status);
return_ACPI_STATUS(status);
}
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