1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4  * Module Name: dscontrol - Support for execution control opcodes -
7  * Copyright (C) 2000 - 2022, Intel Corp.
25  * PARAMETERS:  walk_list       - The list that owns the walk stack
26  *              op              - The control Op
30  * DESCRIPTION: Handles all control ops encountered during control method
44 			  op, op->common.aml_opcode, walk_state));  in acpi_ds_exec_begin_control_op()
46 	switch (op->common.aml_opcode) {  in acpi_ds_exec_begin_control_op()
50 		 * There is no need to allocate a new control state.  in acpi_ds_exec_begin_control_op()
52 		if (walk_state->control_state) {  in acpi_ds_exec_begin_control_op()
53 			if (walk_state->control_state->control.  in acpi_ds_exec_begin_control_op()
55 			    (walk_state->parser_state.aml - 1)) {  in acpi_ds_exec_begin_control_op()
57 				/* Reset the state to start-of-loop */  in acpi_ds_exec_begin_control_op()
59 				walk_state->control_state->common.state =  in acpi_ds_exec_begin_control_op()
61 				break;  in acpi_ds_exec_begin_control_op()
69 		 * IF/WHILE: Create a new control state to manage these  in acpi_ds_exec_begin_control_op()
76 			break;  in acpi_ds_exec_begin_control_op()
82 		control_state->control.aml_predicate_start =  in acpi_ds_exec_begin_control_op()
83 		    walk_state->parser_state.aml - 1;  in acpi_ds_exec_begin_control_op()
84 		control_state->control.package_end =  in acpi_ds_exec_begin_control_op()
85 		    walk_state->parser_state.pkg_end;  in acpi_ds_exec_begin_control_op()
86 		control_state->control.opcode = op->common.aml_opcode;  in acpi_ds_exec_begin_control_op()
87 		control_state->control.loop_timeout = acpi_os_get_timer() +  in acpi_ds_exec_begin_control_op()
90 		/* Push the control state on this walk's control stack */  in acpi_ds_exec_begin_control_op()
92 		acpi_ut_push_generic_state(&walk_state->control_state,  in acpi_ds_exec_begin_control_op()
94 		break;  in acpi_ds_exec_begin_control_op()
101 		if (walk_state->last_predicate) {  in acpi_ds_exec_begin_control_op()
105 		break;  in acpi_ds_exec_begin_control_op()
109 		break;  in acpi_ds_exec_begin_control_op()
113 		break;  in acpi_ds_exec_begin_control_op()
123  * PARAMETERS:  walk_list       - The list that owns the walk stack
124  *              op              - The control Op
128  * DESCRIPTION: Handles all control ops encountered during control method
142 	switch (op->common.aml_opcode) {  in acpi_ds_exec_end_control_op()
151 		walk_state->last_predicate =  in acpi_ds_exec_end_control_op()
152 		    (u8)walk_state->control_state->common.value;  in acpi_ds_exec_end_control_op()
155 		 * Pop the control state that was created at the start  in acpi_ds_exec_end_control_op()
159 		    acpi_ut_pop_generic_state(&walk_state->control_state);  in acpi_ds_exec_end_control_op()
161 		break;  in acpi_ds_exec_end_control_op()
165 		break;  in acpi_ds_exec_end_control_op()
171 		control_state = walk_state->control_state;  in acpi_ds_exec_end_control_op()
172 		if (control_state->common.value) {  in acpi_ds_exec_end_control_op()
183 					    control_state->control.  in acpi_ds_exec_end_control_op()
186 				break;  in acpi_ds_exec_end_control_op()
194 			walk_state->aml_last_while =  in acpi_ds_exec_end_control_op()
195 			    control_state->control.aml_predicate_start;  in acpi_ds_exec_end_control_op()
196 			break;  in acpi_ds_exec_end_control_op()
204 		/* Pop this control state and free it */  in acpi_ds_exec_end_control_op()
207 		    acpi_ut_pop_generic_state(&walk_state->control_state);  in acpi_ds_exec_end_control_op()
209 		break;  in acpi_ds_exec_end_control_op()
215 				  op->common.value.arg));  in acpi_ds_exec_end_control_op()
218 		 * One optional operand -- the return value  in acpi_ds_exec_end_control_op()
222 		if (op->common.value.arg) {  in acpi_ds_exec_end_control_op()
232 						    op->common.value.arg);  in acpi_ds_exec_end_control_op()
243 			    acpi_ex_resolve_to_value(&walk_state->operands[0],  in acpi_ds_exec_end_control_op()
251 			 * value. This is the only place where walk_state->return_desc  in acpi_ds_exec_end_control_op()
254 			walk_state->return_desc = walk_state->operands[0];  in acpi_ds_exec_end_control_op()
255 		} else if (walk_state->result_count) {  in acpi_ds_exec_end_control_op()
272 			     (walk_state->results->results.obj_desc[0]) ==  in acpi_ds_exec_end_control_op()
274 			    && ((walk_state->results->results.obj_desc[0])->  in acpi_ds_exec_end_control_op()
276 			    && ((walk_state->results->results.obj_desc[0])->  in acpi_ds_exec_end_control_op()
279 				    acpi_ex_resolve_to_value(&walk_state->  in acpi_ds_exec_end_control_op()
280 							     results->results.  in acpi_ds_exec_end_control_op()
288 			walk_state->return_desc =  in acpi_ds_exec_end_control_op()
289 			    walk_state->results->results.obj_desc[0];  in acpi_ds_exec_end_control_op()
293 			if (walk_state->num_operands) {  in acpi_ds_exec_end_control_op()
294 				acpi_ut_remove_reference(walk_state->  in acpi_ds_exec_end_control_op()
298 			walk_state->operands[0] = NULL;  in acpi_ds_exec_end_control_op()
299 			walk_state->num_operands = 0;  in acpi_ds_exec_end_control_op()
300 			walk_state->return_desc = NULL;  in acpi_ds_exec_end_control_op()
305 				  walk_state, walk_state->return_desc));  in acpi_ds_exec_end_control_op()
307 		/* End the control method execution right now */  in acpi_ds_exec_end_control_op()
310 		break;  in acpi_ds_exec_end_control_op()
316 		break;  in acpi_ds_exec_end_control_op()
326 		break;  in acpi_ds_exec_end_control_op()
331 		/* Pop and delete control states until we find a while */  in acpi_ds_exec_end_control_op()
333 		while (walk_state->control_state &&  in acpi_ds_exec_end_control_op()
334 		       (walk_state->control_state->control.opcode !=  in acpi_ds_exec_end_control_op()
337 			    acpi_ut_pop_generic_state(&walk_state->  in acpi_ds_exec_end_control_op()
344 		if (!walk_state->control_state) {  in acpi_ds_exec_end_control_op()
348 		/* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */  in acpi_ds_exec_end_control_op()
350 		walk_state->aml_last_while =  in acpi_ds_exec_end_control_op()
351 		    walk_state->control_state->control.package_end;  in acpi_ds_exec_end_control_op()
355 		if (op->common.aml_opcode == AML_BREAK_OP) {  in acpi_ds_exec_end_control_op()
360 		break;  in acpi_ds_exec_end_control_op()
364 		ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",  in acpi_ds_exec_end_control_op()
365 			    op->common.aml_opcode, op));  in acpi_ds_exec_end_control_op()
368 		break;  in acpi_ds_exec_end_control_op()