cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/psloop.c

/******************************************************************************
 *
 * Module Name: psloop - Main AML parse loop
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

/*
 * Parse the AML and build an operation tree as most interpreters, (such as
 * Perl) do. Parsing is done by hand rather than with a YACC generated parser
 * to tightly constrain stack and dynamic memory usage. Parsing is kept
 * flexible and the code fairly compact by parsing based on a list of AML
 * opcode templates in aml_op_info[].
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acparser.h"
#include "acdispat.h"
#include "amlcode.h"


#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psloop")

/* Local prototypes */
static acpi_status
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
		      u8 * aml_op_start, union acpi_parse_object *op);

static void
acpi_ps_link_module_code(union acpi_parse_object *parent_op,
			 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_arguments
 *
 * PARAMETERS:  walk_state          - Current state
 *              aml_op_start        - Op start in AML
 *              op                  - Current Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get arguments for passed Op.
 *
 ******************************************************************************/


static acpi_status acpi_ps_get_arguments(struct acpi_walk_state *walk_state, u8 * aml_op_start, union acpi_parse_object *op) { acpi_status status = AE_OK; union acpi_parse_object *arg = NULL; const struct acpi_opcode_info *op_info; ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Get arguments for opcode [%s]\n", op->common.aml_op_name)); switch (op->common.aml_opcode) { case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ case AML_WORD_OP: /* AML_WORDDATA_ARG */ case AML_DWORD_OP: /* AML_DWORDATA_ARG */ case AML_QWORD_OP: /* AML_QWORDATA_ARG */ case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ /* Fill in constant or string argument directly */ acpi_ps_get_next_simple_arg(&(walk_state->parser_state), GET_CURRENT_ARG_TYPE(walk_state-> arg_types), op); break; case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ status = acpi_ps_get_next_namepath(walk_state, &(walk_state->parser_state), op, ACPI_POSSIBLE_METHOD_CALL); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } walk_state->arg_types = 0; break; default: /* * Op is not a constant or string, append each argument to the Op */ while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && !walk_state->arg_count) { walk_state->aml = walk_state->parser_state.aml; status = acpi_ps_get_next_arg(walk_state, &(walk_state->parser_state), GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (arg) { acpi_ps_append_arg(op, arg); } INCREMENT_ARG_LIST(walk_state->arg_types); } /* * Handle executable code at "module-level". This refers to * executable opcodes that appear outside of any control method. */ if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) && ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { /* * We want to skip If/Else/While constructs during Pass1 because we * want to actually conditionally execute the code during Pass2. * * Except for disassembly, where we always want to walk the * If/Else/While packages */ switch (op->common.aml_opcode) { case AML_IF_OP: case AML_ELSE_OP: case AML_WHILE_OP: /* * Currently supported module-level opcodes are: * IF/ELSE/WHILE. These appear to be the most common, * and easiest to support since they open an AML * package. */ if (walk_state->pass_number == ACPI_IMODE_LOAD_PASS1) { acpi_ps_link_module_code(op->common. parent, aml_op_start, (u32) (walk_state-> parser_state. pkg_end - aml_op_start), walk_state-> owner_id); } ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Pass1: Skipping an If/Else/While body\n")); /* Skip body of if/else/while in pass 1 */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; break; default: /* * Check for an unsupported executable opcode at module * level. We must be in PASS1, the parent must be a SCOPE, * The opcode class must be EXECUTE, and the opcode must * not be an argument to another opcode. */ if ((walk_state->pass_number == ACPI_IMODE_LOAD_PASS1) && (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) { op_info = acpi_ps_get_opcode_info(op->common. aml_opcode); if ((op_info->class == AML_CLASS_EXECUTE) && (!arg)) { ACPI_WARNING((AE_INFO, "Unsupported module-level executable opcode " "0x%.2X at table offset 0x%.4X", op->common. aml_opcode, (u32) (ACPI_PTR_DIFF (aml_op_start, walk_state-> parser_state. aml_start) + sizeof(struct acpi_table_header)))); } } break; } } /* Special processing for certain opcodes */ switch (op->common.aml_opcode) { case AML_METHOD_OP: /* * Skip parsing of control method because we don't have enough * info in the first pass to parse it correctly. * * Save the length and address of the body */ op->named.data = walk_state->parser_state.aml; op->named.length = (u32) (walk_state->parser_state.pkg_end - walk_state->parser_state.aml); /* Skip body of method */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; break; case AML_BUFFER_OP: case AML_PACKAGE_OP: case AML_VAR_PACKAGE_OP: if ((op->common.parent) && (op->common.parent->common.aml_opcode == AML_NAME_OP) && (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2)) { /* * Skip parsing of Buffers and Packages because we don't have * enough info in the first pass to parse them correctly. */ op->named.data = aml_op_start; op->named.length = (u32) (walk_state->parser_state.pkg_end - aml_op_start); /* Skip body */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; } break; case AML_WHILE_OP: if (walk_state->control_state) { walk_state->control_state->control.package_end = walk_state->parser_state.pkg_end; } break; default: /* No action for all other opcodes */ break; } break; } return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore48675.47%660.00%
Mikhail Kouzmich14923.14%110.00%
Lin Ming81.24%220.00%
Lv Zheng10.16%110.00%
Total644100.00%10100.00%

/******************************************************************************* * * FUNCTION: acpi_ps_link_module_code * * PARAMETERS: parent_op - Parent parser op * aml_start - Pointer to the AML * aml_length - Length of executable AML * owner_id - owner_id of module level code * * RETURN: None. * * DESCRIPTION: Wrap the module-level code with a method object and link the * object to the global list. Note, the mutex field of the method * object is used to link multiple module-level code objects. * ******************************************************************************/
static void acpi_ps_link_module_code(union acpi_parse_object *parent_op, u8 *aml_start, u32 aml_length, acpi_owner_id owner_id) { union acpi_operand_object *prev; union acpi_operand_object *next; union acpi_operand_object *method_obj; struct acpi_namespace_node *parent_node; ACPI_FUNCTION_TRACE(ps_link_module_code); /* Get the tail of the list */ prev = next = acpi_gbl_module_code_list; while (next) { prev = next; next = next->method.mutex; } /* * Insert the module level code into the list. Merge it if it is * adjacent to the previous element. */ if (!prev || ((prev->method.aml_start + prev->method.aml_length) != aml_start)) { /* Create, initialize, and link a new temporary method object */ method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); if (!method_obj) { return_VOID; } ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Create/Link new code block: %p\n", method_obj)); if (parent_op->common.node) { parent_node = parent_op->common.node; } else { parent_node = acpi_gbl_root_node; } method_obj->method.aml_start = aml_start; method_obj->method.aml_length = aml_length; method_obj->method.owner_id = owner_id; method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL; /* * Save the parent node in next_object. This is cheating, but we * don't want to expand the method object. */ method_obj->method.next_object = ACPI_CAST_PTR(union acpi_operand_object, parent_node); if (!prev) { acpi_gbl_module_code_list = method_obj; } else { prev->method.mutex = method_obj; } } else { ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Appending to existing code block: %p\n", prev)); prev->method.aml_length += aml_length; } return_VOID; }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore20885.60%375.00%
Mikhail Kouzmich3514.40%125.00%
Total243100.00%4100.00%

/******************************************************************************* * * FUNCTION: acpi_ps_parse_loop * * PARAMETERS: walk_state - Current state * * RETURN: Status * * DESCRIPTION: Parse AML (pointed to by the current parser state) and return * a tree of ops. * ******************************************************************************/
acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_parse_object *op = NULL; /* current op */ struct acpi_parse_state *parser_state; u8 *aml_op_start = NULL; ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); if (walk_state->descending_callback == NULL) { return_ACPI_STATUS(AE_BAD_PARAMETER); } parser_state = &walk_state->parser_state; walk_state->arg_types = 0; #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { /* We are restarting a preempted control method */ if (acpi_ps_has_completed_scope(parser_state)) { /* * We must check if a predicate to an IF or WHILE statement * was just completed */ if ((parser_state->scope->parse_scope.op) && ((parser_state->scope->parse_scope.op->common. aml_opcode == AML_IF_OP) || (parser_state->scope->parse_scope.op->common. aml_opcode == AML_WHILE_OP)) && (walk_state->control_state) && (walk_state->control_state->common.state == ACPI_CONTROL_PREDICATE_EXECUTING)) { /* * A predicate was just completed, get the value of the * predicate and branch based on that value */ walk_state->op = NULL; status = acpi_ds_get_predicate_value(walk_state, ACPI_TO_POINTER (TRUE)); if (ACPI_FAILURE(status) && ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) { if (status == AE_AML_NO_RETURN_VALUE) { ACPI_EXCEPTION((AE_INFO, status, "Invoked method did not return a value")); } ACPI_EXCEPTION((AE_INFO, status, "GetPredicate Failed")); return_ACPI_STATUS(status); } status = acpi_ps_next_parse_state(walk_state, op, status); } acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); } else if (walk_state->prev_op) { /* We were in the middle of an op */ op = walk_state->prev_op; walk_state->arg_types = walk_state->prev_arg_types; } } #endif /* Iterative parsing loop, while there is more AML to process: */ while ((parser_state->aml < parser_state->aml_end) || (op)) { aml_op_start = parser_state->aml; if (!op) { status = acpi_ps_create_op(walk_state, aml_op_start, &op); if (ACPI_FAILURE(status)) { if (status == AE_CTRL_PARSE_CONTINUE) { continue; } if (status == AE_CTRL_PARSE_PENDING) { status = AE_OK; } if (status == AE_CTRL_TERMINATE) { return_ACPI_STATUS(status); } status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } continue; } acpi_ex_start_trace_opcode(op, walk_state); } /* * Start arg_count at zero because we don't know if there are * any args yet */ walk_state->arg_count = 0; /* Are there any arguments that must be processed? */ if (walk_state->arg_types) { /* Get arguments */ status = acpi_ps_get_arguments(walk_state, aml_op_start, op); if (ACPI_FAILURE(status)) { status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } continue; } } /* Check for arguments that need to be processed */ if (walk_state->arg_count) { /* * There are arguments (complex ones), push Op and * prepare for argument */ status = acpi_ps_push_scope(parser_state, op, walk_state->arg_types, walk_state->arg_count); if (ACPI_FAILURE(status)) { status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } continue; } op = NULL; continue; } /* * All arguments have been processed -- Op is complete, * prepare for next */ walk_state->op_info = acpi_ps_get_opcode_info(op->common.aml_opcode); if (walk_state->op_info->flags & AML_NAMED) { if (op->common.aml_opcode == AML_REGION_OP || op->common.aml_opcode == AML_DATA_REGION_OP) { /* * Skip parsing of control method or opregion body, * because we don't have enough info in the first pass * to parse them correctly. * * Completed parsing an op_region declaration, we now * know the length. */ op->named.length = (u32) (parser_state->aml - op->named.data); } } if (walk_state->op_info->flags & AML_CREATE) { /* * Backup to beginning of create_XXXfield declaration (1 for * Opcode) * * body_length is unknown until we parse the body */ op->named.length = (u32) (parser_state->aml - op->named.data); } if (op->common.aml_opcode == AML_BANK_FIELD_OP) { /* * Backup to beginning of bank_field declaration * * body_length is unknown until we parse the body */ op->named.length = (u32) (parser_state->aml - op->named.data); } /* This op complete, notify the dispatcher */ if (walk_state->ascending_callback != NULL) { walk_state->op = op; walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback(walk_state); status = acpi_ps_next_parse_state(walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; } } status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } } /* while parser_state->Aml */ status = acpi_ps_complete_final_op(walk_state, op, status); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Mikhail Kouzmich44155.06%111.11%
Robert Moore31038.70%444.44%
Lin Ming425.24%222.22%
Lv Zheng81.00%222.22%
Total801100.00%9100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore104259.20%1257.14%
Mikhail Kouzmich65136.99%14.76%
Lin Ming502.84%314.29%
Lv Zheng120.68%314.29%
Len Brown50.28%29.52%
Total1760100.00%21100.00%
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