Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Linus Torvalds (pre-git) | 409 | 45.60% | 3 | 8.33% |
Robert Moore | 181 | 20.18% | 18 | 50.00% |
Linus Torvalds | 151 | 16.83% | 3 | 8.33% |
Andy Grover | 108 | 12.04% | 5 | 13.89% |
Lv Zheng | 27 | 3.01% | 2 | 5.56% |
Len Brown | 17 | 1.90% | 2 | 5.56% |
Nick Desaulniers | 2 | 0.22% | 1 | 2.78% |
Erik Schmauss | 1 | 0.11% | 1 | 2.78% |
Patrick Mochel | 1 | 0.11% | 1 | 2.78% |
Total | 897 | 36 |
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: dscontrol - Support for execution control opcodes - * if/else/while/return * * Copyright (C) 2000 - 2023, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "amlcode.h" #include "acdispat.h" #include "acinterp.h" #include "acdebug.h" #define _COMPONENT ACPI_DISPATCHER ACPI_MODULE_NAME("dscontrol") /******************************************************************************* * * FUNCTION: acpi_ds_exec_begin_control_op * * PARAMETERS: walk_list - The list that owns the walk stack * op - The control Op * * RETURN: Status * * DESCRIPTION: Handles all control ops encountered during control method * execution. * ******************************************************************************/ acpi_status acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state, union acpi_parse_object *op) { acpi_status status = AE_OK; union acpi_generic_state *control_state; ACPI_FUNCTION_NAME(ds_exec_begin_control_op); ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op, op->common.aml_opcode, walk_state)); switch (op->common.aml_opcode) { case AML_WHILE_OP: /* * If this is an additional iteration of a while loop, continue. * There is no need to allocate a new control state. */ if (walk_state->control_state) { if (walk_state->control_state->control. aml_predicate_start == (walk_state->parser_state.aml - 1)) { /* Reset the state to start-of-loop */ walk_state->control_state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING; break; } } ACPI_FALLTHROUGH; case AML_IF_OP: /* * IF/WHILE: Create a new control state to manage these * constructs. We need to manage these as a stack, in order * to handle nesting. */ control_state = acpi_ut_create_control_state(); if (!control_state) { status = AE_NO_MEMORY; break; } /* * Save a pointer to the predicate for multiple executions * of a loop */ control_state->control.aml_predicate_start = walk_state->parser_state.aml - 1; control_state->control.package_end = walk_state->parser_state.pkg_end; control_state->control.opcode = op->common.aml_opcode; control_state->control.loop_timeout = acpi_os_get_timer() + ((u64)acpi_gbl_max_loop_iterations * ACPI_100NSEC_PER_SEC); /* Push the control state on this walk's control stack */ acpi_ut_push_generic_state(&walk_state->control_state, control_state); break; case AML_ELSE_OP: /* Predicate is in the state object */ /* If predicate is true, the IF was executed, ignore ELSE part */ if (walk_state->last_predicate) { status = AE_CTRL_TRUE; } break; case AML_RETURN_OP: break; default: break; } return (status); } /******************************************************************************* * * FUNCTION: acpi_ds_exec_end_control_op * * PARAMETERS: walk_list - The list that owns the walk stack * op - The control Op * * RETURN: Status * * DESCRIPTION: Handles all control ops encountered during control method * execution. * ******************************************************************************/ acpi_status acpi_ds_exec_end_control_op(struct acpi_walk_state *walk_state, union acpi_parse_object *op) { acpi_status status = AE_OK; union acpi_generic_state *control_state; ACPI_FUNCTION_NAME(ds_exec_end_control_op); switch (op->common.aml_opcode) { case AML_IF_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op)); /* * Save the result of the predicate in case there is an * ELSE to come */ walk_state->last_predicate = (u8)walk_state->control_state->common.value; /* * Pop the control state that was created at the start * of the IF and free it */ control_state = acpi_ut_pop_generic_state(&walk_state->control_state); acpi_ut_delete_generic_state(control_state); break; case AML_ELSE_OP: break; case AML_WHILE_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op)); control_state = walk_state->control_state; if (control_state->common.value) { /* Predicate was true, the body of the loop was just executed */ /* * This infinite loop detection mechanism allows the interpreter * to escape possibly infinite loops. This can occur in poorly * written AML when the hardware does not respond within a while * loop and the loop does not implement a timeout. */ if (ACPI_TIME_AFTER(acpi_os_get_timer(), control_state->control. loop_timeout)) { status = AE_AML_LOOP_TIMEOUT; break; } /* * Go back and evaluate the predicate and maybe execute the loop * another time */ status = AE_CTRL_PENDING; walk_state->aml_last_while = control_state->control.aml_predicate_start; break; } /* Predicate was false, terminate this while loop */ ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] termination! Op=%p\n", op)); /* Pop this control state and free it */ control_state = acpi_ut_pop_generic_state(&walk_state->control_state); acpi_ut_delete_generic_state(control_state); break; case AML_RETURN_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[RETURN_OP] Op=%p Arg=%p\n", op, op->common.value.arg)); /* * One optional operand -- the return value * It can be either an immediate operand or a result that * has been bubbled up the tree */ if (op->common.value.arg) { /* Since we have a real Return(), delete any implicit return */ acpi_ds_clear_implicit_return(walk_state); /* Return statement has an immediate operand */ status = acpi_ds_create_operands(walk_state, op->common.value.arg); if (ACPI_FAILURE(status)) { return (status); } /* * If value being returned is a Reference (such as * an arg or local), resolve it now because it may * cease to exist at the end of the method. */ status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state); if (ACPI_FAILURE(status)) { return (status); } /* * Get the return value and save as the last result * value. This is the only place where walk_state->return_desc * is set to anything other than zero! */ walk_state->return_desc = walk_state->operands[0]; } else if (walk_state->result_count) { /* Since we have a real Return(), delete any implicit return */ acpi_ds_clear_implicit_return(walk_state); /* * The return value has come from a previous calculation. * * If value being returned is a Reference (such as * an arg or local), resolve it now because it may * cease to exist at the end of the method. * * Allow references created by the Index operator to return * unchanged. */ if ((ACPI_GET_DESCRIPTOR_TYPE (walk_state->results->results.obj_desc[0]) == ACPI_DESC_TYPE_OPERAND) && ((walk_state->results->results.obj_desc[0])-> common.type == ACPI_TYPE_LOCAL_REFERENCE) && ((walk_state->results->results.obj_desc[0])-> reference.class != ACPI_REFCLASS_INDEX)) { status = acpi_ex_resolve_to_value(&walk_state-> results->results. obj_desc[0], walk_state); if (ACPI_FAILURE(status)) { return (status); } } walk_state->return_desc = walk_state->results->results.obj_desc[0]; } else { /* No return operand */ if (walk_state->num_operands) { acpi_ut_remove_reference(walk_state-> operands[0]); } walk_state->operands[0] = NULL; walk_state->num_operands = 0; walk_state->return_desc = NULL; } ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Completed RETURN_OP State=%p, RetVal=%p\n", walk_state, walk_state->return_desc)); /* End the control method execution right now */ status = AE_CTRL_TERMINATE; break; case AML_NOOP_OP: /* Just do nothing! */ break; case AML_BREAKPOINT_OP: acpi_db_signal_break_point(walk_state); /* Call to the OSL in case OS wants a piece of the action */ status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT, "Executed AML Breakpoint opcode"); break; case AML_BREAK_OP: case AML_CONTINUE_OP: /* ACPI 2.0 */ /* Pop and delete control states until we find a while */ while (walk_state->control_state && (walk_state->control_state->control.opcode != AML_WHILE_OP)) { control_state = acpi_ut_pop_generic_state(&walk_state-> control_state); acpi_ut_delete_generic_state(control_state); } /* No while found? */ if (!walk_state->control_state) { return (AE_AML_NO_WHILE); } /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */ walk_state->aml_last_while = walk_state->control_state->control.package_end; /* Return status depending on opcode */ if (op->common.aml_opcode == AML_BREAK_OP) { status = AE_CTRL_BREAK; } else { status = AE_CTRL_CONTINUE; } break; default: ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p", op->common.aml_opcode, op)); status = AE_AML_BAD_OPCODE; break; } return (status); }
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