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231 lines
6.4 KiB
231 lines
6.4 KiB
// 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 - 2021, 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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