232 lines
6.4 KiB
C
232 lines
6.4 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: psscope - Parser scope stack management routines
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acparser.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("psscope")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_parent_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Pointer to an Op object
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*
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* DESCRIPTION: Get parent of current op being parsed
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*
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******************************************************************************/
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union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state
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*parser_state)
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{
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return (parser_state->scope->parse_scope.op);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_has_completed_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Boolean, TRUE = scope completed.
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*
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* DESCRIPTION: Is parsing of current argument complete? Determined by
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* 1) AML pointer is at or beyond the end of the scope
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* 2) The scope argument count has reached zero.
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*
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******************************************************************************/
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u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state)
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{
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return ((u8)
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((parser_state->aml >= parser_state->scope->parse_scope.arg_end
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|| !parser_state->scope->parse_scope.arg_count)));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_init_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* root - the Root Node of this new scope
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate and init a new scope object
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*
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******************************************************************************/
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acpi_status
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acpi_ps_init_scope(struct acpi_parse_state * parser_state,
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union acpi_parse_object * root_op)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR(ps_init_scope, root_op);
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scope = acpi_ut_create_generic_state();
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if (!scope) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_RPSCOPE;
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scope->parse_scope.op = root_op;
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scope->parse_scope.arg_count = ACPI_VAR_ARGS;
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scope->parse_scope.arg_end = parser_state->aml_end;
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scope->parse_scope.pkg_end = parser_state->aml_end;
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parser_state->scope = scope;
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parser_state->start_op = root_op;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_push_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* op - Current op to be pushed
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* remaining_args - List of args remaining
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* arg_count - Fixed or variable number of args
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*
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* RETURN: Status
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*
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* DESCRIPTION: Push current op to begin parsing its argument
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*
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******************************************************************************/
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acpi_status
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acpi_ps_push_scope(struct acpi_parse_state *parser_state,
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union acpi_parse_object *op,
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u32 remaining_args, u32 arg_count)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR(ps_push_scope, op);
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scope = acpi_ut_create_generic_state();
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if (!scope) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_PSCOPE;
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scope->parse_scope.op = op;
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scope->parse_scope.arg_list = remaining_args;
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scope->parse_scope.arg_count = arg_count;
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scope->parse_scope.pkg_end = parser_state->pkg_end;
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/* Push onto scope stack */
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acpi_ut_push_generic_state(&parser_state->scope, scope);
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if (arg_count == ACPI_VAR_ARGS) {
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/* Multiple arguments */
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scope->parse_scope.arg_end = parser_state->pkg_end;
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} else {
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/* Single argument */
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scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR);
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_pop_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* op - Where the popped op is returned
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* arg_list - Where the popped "next argument" is
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* returned
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* arg_count - Count of objects in arg_list
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*
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* RETURN: Status
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*
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* DESCRIPTION: Return to parsing a previous op
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*
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******************************************************************************/
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void
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acpi_ps_pop_scope(struct acpi_parse_state *parser_state,
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union acpi_parse_object **op, u32 * arg_list, u32 * arg_count)
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{
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union acpi_generic_state *scope = parser_state->scope;
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ACPI_FUNCTION_TRACE(ps_pop_scope);
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/* Only pop the scope if there is in fact a next scope */
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if (scope->common.next) {
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scope = acpi_ut_pop_generic_state(&parser_state->scope);
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/* Return to parsing previous op */
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*op = scope->parse_scope.op;
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*arg_list = scope->parse_scope.arg_list;
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*arg_count = scope->parse_scope.arg_count;
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parser_state->pkg_end = scope->parse_scope.pkg_end;
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/* All done with this scope state structure */
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acpi_ut_delete_generic_state(scope);
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} else {
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/* Empty parse stack, prepare to fetch next opcode */
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*op = NULL;
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*arg_list = 0;
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*arg_count = 0;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Popped Op %p Args %X\n", *op, *arg_count));
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_cleanup_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: None
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*
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* DESCRIPTION: Destroy available list, remaining stack levels, and return
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* root scope
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*
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******************************************************************************/
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void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR(ps_cleanup_scope, parser_state);
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if (!parser_state) {
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return_VOID;
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}
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/* Delete anything on the scope stack */
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while (parser_state->scope) {
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scope = acpi_ut_pop_generic_state(&parser_state->scope);
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acpi_ut_delete_generic_state(scope);
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}
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return_VOID;
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}
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