| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: psscope - Parser scope stack management routines |
| * |
| * Copyright (C) 2000 - 2020, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "acparser.h" |
| |
| #define _COMPONENT ACPI_PARSER |
| ACPI_MODULE_NAME("psscope") |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_get_parent_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * |
| * RETURN: Pointer to an Op object |
| * |
| * DESCRIPTION: Get parent of current op being parsed |
| * |
| ******************************************************************************/ |
| union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state |
| *parser_state) |
| { |
| |
| return (parser_state->scope->parse_scope.op); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_has_completed_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * |
| * RETURN: Boolean, TRUE = scope completed. |
| * |
| * DESCRIPTION: Is parsing of current argument complete? Determined by |
| * 1) AML pointer is at or beyond the end of the scope |
| * 2) The scope argument count has reached zero. |
| * |
| ******************************************************************************/ |
| |
| u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state) |
| { |
| |
| return ((u8) |
| ((parser_state->aml >= parser_state->scope->parse_scope.arg_end |
| || !parser_state->scope->parse_scope.arg_count))); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_init_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * root - the Root Node of this new scope |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Allocate and init a new scope object |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ps_init_scope(struct acpi_parse_state * parser_state, |
| union acpi_parse_object * root_op) |
| { |
| union acpi_generic_state *scope; |
| |
| ACPI_FUNCTION_TRACE_PTR(ps_init_scope, root_op); |
| |
| scope = acpi_ut_create_generic_state(); |
| if (!scope) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_RPSCOPE; |
| scope->parse_scope.op = root_op; |
| scope->parse_scope.arg_count = ACPI_VAR_ARGS; |
| scope->parse_scope.arg_end = parser_state->aml_end; |
| scope->parse_scope.pkg_end = parser_state->aml_end; |
| |
| parser_state->scope = scope; |
| parser_state->start_op = root_op; |
| |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_push_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * op - Current op to be pushed |
| * remaining_args - List of args remaining |
| * arg_count - Fixed or variable number of args |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Push current op to begin parsing its argument |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ps_push_scope(struct acpi_parse_state *parser_state, |
| union acpi_parse_object *op, |
| u32 remaining_args, u32 arg_count) |
| { |
| union acpi_generic_state *scope; |
| |
| ACPI_FUNCTION_TRACE_PTR(ps_push_scope, op); |
| |
| scope = acpi_ut_create_generic_state(); |
| if (!scope) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_PSCOPE; |
| scope->parse_scope.op = op; |
| scope->parse_scope.arg_list = remaining_args; |
| scope->parse_scope.arg_count = arg_count; |
| scope->parse_scope.pkg_end = parser_state->pkg_end; |
| |
| /* Push onto scope stack */ |
| |
| acpi_ut_push_generic_state(&parser_state->scope, scope); |
| |
| if (arg_count == ACPI_VAR_ARGS) { |
| |
| /* Multiple arguments */ |
| |
| scope->parse_scope.arg_end = parser_state->pkg_end; |
| } else { |
| /* Single argument */ |
| |
| scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR); |
| } |
| |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_pop_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * op - Where the popped op is returned |
| * arg_list - Where the popped "next argument" is |
| * returned |
| * arg_count - Count of objects in arg_list |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Return to parsing a previous op |
| * |
| ******************************************************************************/ |
| |
| void |
| acpi_ps_pop_scope(struct acpi_parse_state *parser_state, |
| union acpi_parse_object **op, u32 * arg_list, u32 * arg_count) |
| { |
| union acpi_generic_state *scope = parser_state->scope; |
| |
| ACPI_FUNCTION_TRACE(ps_pop_scope); |
| |
| /* Only pop the scope if there is in fact a next scope */ |
| |
| if (scope->common.next) { |
| scope = acpi_ut_pop_generic_state(&parser_state->scope); |
| |
| /* Return to parsing previous op */ |
| |
| *op = scope->parse_scope.op; |
| *arg_list = scope->parse_scope.arg_list; |
| *arg_count = scope->parse_scope.arg_count; |
| parser_state->pkg_end = scope->parse_scope.pkg_end; |
| |
| /* All done with this scope state structure */ |
| |
| acpi_ut_delete_generic_state(scope); |
| } else { |
| /* Empty parse stack, prepare to fetch next opcode */ |
| |
| *op = NULL; |
| *arg_list = 0; |
| *arg_count = 0; |
| } |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
| "Popped Op %p Args %X\n", *op, *arg_count)); |
| return_VOID; |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ps_cleanup_scope |
| * |
| * PARAMETERS: parser_state - Current parser state object |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Destroy available list, remaining stack levels, and return |
| * root scope |
| * |
| ******************************************************************************/ |
| |
| void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state) |
| { |
| union acpi_generic_state *scope; |
| |
| ACPI_FUNCTION_TRACE_PTR(ps_cleanup_scope, parser_state); |
| |
| if (!parser_state) { |
| return_VOID; |
| } |
| |
| /* Delete anything on the scope stack */ |
| |
| while (parser_state->scope) { |
| scope = acpi_ut_pop_generic_state(&parser_state->scope); |
| acpi_ut_delete_generic_state(scope); |
| } |
| |
| return_VOID; |
| } |