mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
![Bob Moore](/assets/img/avatar_default.png)
ACPICA commit 738d7b0726e6c0458ef93c0a01c0377490888d1e Affects all source modules and utility signons. Link: https://github.com/acpica/acpica/commit/738d7b07 Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
561 lines
14 KiB
C
561 lines
14 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: psloop - Main AML parse loop
|
|
*
|
|
* Copyright (C) 2000 - 2022, Intel Corp.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* 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 "acinterp.h"
|
|
#include "acparser.h"
|
|
#include "acdispat.h"
|
|
#include "amlcode.h"
|
|
#include "acconvert.h"
|
|
#include "acnamesp.h"
|
|
|
|
#define _COMPONENT ACPI_PARSER
|
|
ACPI_MODULE_NAME("psloop")
|
|
|
|
/* Local prototypes */
|
|
static acpi_status
|
|
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
|
|
u8 * aml_op_start, union acpi_parse_object *op);
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* 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;
|
|
|
|
ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
|
"Get arguments for opcode [%s]\n",
|
|
op->common.aml_op_name));
|
|
|
|
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,
|
|
ACPI_POSSIBLE_METHOD_CALL);
|
|
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 = walk_state->parser_state.aml;
|
|
|
|
switch (op->common.aml_opcode) {
|
|
case AML_METHOD_OP:
|
|
case AML_BUFFER_OP:
|
|
case AML_PACKAGE_OP:
|
|
case AML_VARIABLE_PACKAGE_OP:
|
|
case AML_WHILE_OP:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ASL_CV_CAPTURE_COMMENTS(walk_state);
|
|
break;
|
|
}
|
|
|
|
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) {
|
|
acpi_ps_append_arg(op, arg);
|
|
}
|
|
|
|
INCREMENT_ARG_LIST(walk_state->arg_types);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
|
"Final argument count: %8.8X pass %u\n",
|
|
walk_state->arg_count,
|
|
walk_state->pass_number));
|
|
|
|
/* 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_VARIABLE_PACKAGE_OP:
|
|
|
|
if ((op->common.parent) &&
|
|
(op->common.parent->common.aml_opcode ==
|
|
AML_NAME_OP)
|
|
&& (walk_state->pass_number <=
|
|
ACPI_IMODE_LOAD_PASS2)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
|
"Setup Package/Buffer: Pass %u, AML Ptr: %p\n",
|
|
walk_state->pass_number,
|
|
aml_op_start));
|
|
|
|
/*
|
|
* 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_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;
|
|
u8 opcode_length;
|
|
|
|
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;
|
|
|
|
#ifndef 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)
|
|
&& !ACPI_CNTL_EXCEPTION(status)) {
|
|
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)) {
|
|
ASL_CV_CAPTURE_COMMENTS(walk_state);
|
|
|
|
aml_op_start = parser_state->aml;
|
|
if (!op) {
|
|
status =
|
|
acpi_ps_create_op(walk_state, aml_op_start, &op);
|
|
if (ACPI_FAILURE(status)) {
|
|
/*
|
|
* ACPI_PARSE_MODULE_LEVEL means that we are loading a table by
|
|
* executing it as a control method. However, if we encounter
|
|
* an error while loading the table, we need to keep trying to
|
|
* load the table rather than aborting the table load. Set the
|
|
* status to AE_OK to proceed with the table load.
|
|
*/
|
|
if ((walk_state->
|
|
parse_flags & ACPI_PARSE_MODULE_LEVEL)
|
|
&& ((status == AE_ALREADY_EXISTS)
|
|
|| (status == AE_NOT_FOUND))) {
|
|
status = AE_OK;
|
|
}
|
|
if (status == AE_CTRL_PARSE_CONTINUE) {
|
|
continue;
|
|
}
|
|
|
|
if (status == AE_CTRL_PARSE_PENDING) {
|
|
status = AE_OK;
|
|
}
|
|
|
|
if (status == AE_CTRL_TERMINATE) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
status =
|
|
acpi_ps_complete_op(walk_state, &op,
|
|
status);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
if (acpi_ns_opens_scope
|
|
(acpi_ps_get_opcode_info
|
|
(walk_state->opcode)->object_type)) {
|
|
/*
|
|
* If the scope/device op fails to parse, skip the body of
|
|
* the scope op because the parse failure indicates that
|
|
* the device may not exist.
|
|
*/
|
|
ACPI_INFO(("Skipping parse of AML opcode: %s (0x%4.4X)", acpi_ps_get_opcode_name(walk_state->opcode), walk_state->opcode));
|
|
|
|
/*
|
|
* Determine the opcode length before skipping the opcode.
|
|
* An opcode can be 1 byte or 2 bytes in length.
|
|
*/
|
|
opcode_length = 1;
|
|
if ((walk_state->opcode & 0xFF00) ==
|
|
AML_EXTENDED_OPCODE) {
|
|
opcode_length = 2;
|
|
}
|
|
walk_state->parser_state.aml =
|
|
walk_state->aml + opcode_length;
|
|
|
|
walk_state->parser_state.aml =
|
|
acpi_ps_get_next_package_end
|
|
(&walk_state->parser_state);
|
|
walk_state->aml =
|
|
walk_state->parser_state.aml;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
acpi_ex_start_trace_opcode(op, walk_state);
|
|
}
|
|
|
|
/*
|
|
* Start arg_count at zero because we don't know if there are
|
|
* any args yet
|
|
*/
|
|
walk_state->arg_count = 0;
|
|
|
|
switch (op->common.aml_opcode) {
|
|
case AML_BYTE_OP:
|
|
case AML_WORD_OP:
|
|
case AML_DWORD_OP:
|
|
case AML_QWORD_OP:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ASL_CV_CAPTURE_COMMENTS(walk_state);
|
|
break;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
if ((walk_state->control_state) &&
|
|
((walk_state->control_state->control.
|
|
opcode == AML_IF_OP)
|
|
|| (walk_state->control_state->control.
|
|
opcode == AML_WHILE_OP))) {
|
|
/*
|
|
* If the if/while op fails to parse, we will skip parsing
|
|
* the body of the op.
|
|
*/
|
|
parser_state->aml =
|
|
walk_state->control_state->control.
|
|
aml_predicate_start + 1;
|
|
parser_state->aml =
|
|
acpi_ps_get_next_package_end
|
|
(parser_state);
|
|
walk_state->aml = parser_state->aml;
|
|
|
|
ACPI_ERROR((AE_INFO,
|
|
"Skipping While/If block"));
|
|
if (*walk_state->aml == AML_ELSE_OP) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Skipping Else block"));
|
|
walk_state->parser_state.aml =
|
|
walk_state->aml + 1;
|
|
walk_state->parser_state.aml =
|
|
acpi_ps_get_next_package_end
|
|
(parser_state);
|
|
walk_state->aml =
|
|
parser_state->aml;
|
|
}
|
|
ACPI_FREE(acpi_ut_pop_generic_state
|
|
(&walk_state->control_state));
|
|
}
|
|
op = NULL;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Check for arguments that need to be processed */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
|
"Parseloop: argument count: %8.8X\n",
|
|
walk_state->arg_count));
|
|
|
|
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 (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;
|
|
} else
|
|
if ((walk_state->
|
|
parse_flags & ACPI_PARSE_MODULE_LEVEL)
|
|
&& (ACPI_AML_EXCEPTION(status)
|
|
|| status == AE_ALREADY_EXISTS
|
|
|| status == AE_NOT_FOUND)) {
|
|
/*
|
|
* ACPI_PARSE_MODULE_LEVEL flag means that we
|
|
* are currently loading a table by executing
|
|
* it as a control method. However, if we
|
|
* encounter an error while loading the table,
|
|
* we need to keep trying to load the table
|
|
* rather than aborting the table load (setting
|
|
* the status to AE_OK continues the table
|
|
* load). If we get a failure at this point, it
|
|
* means that the dispatcher got an error while
|
|
* trying to execute the Op.
|
|
*/
|
|
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);
|
|
}
|