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-rw-r--r--drivers/acpi/acpica/nsparse.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsparse.c b/drivers/acpi/acpica/nsparse.c
new file mode 100644
index 000000000..c9ef49498
--- /dev/null
+++ b/drivers/acpi/acpica/nsparse.c
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+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: nsparse - namespace interface to AML parser
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "actables.h"
+#include "acinterp.h"
+
+#define _COMPONENT ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsparse")
+
+/*******************************************************************************
+ *
+ * FUNCTION: ns_execute_table
+ *
+ * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
+ * start_node - Where to enter the table into the namespace
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Load ACPI/AML table by executing the entire table as a single
+ * large control method.
+ *
+ * NOTE: The point of this is to execute any module-level code in-place
+ * as the table is parsed. Some AML code depends on this behavior.
+ *
+ * It is a run-time option at this time, but will eventually become
+ * the default.
+ *
+ * Note: This causes the table to only have a single-pass parse.
+ * However, this is compatible with other ACPI implementations.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ns_execute_table(u32 table_index, struct acpi_namespace_node *start_node)
+{
+ acpi_status status;
+ struct acpi_table_header *table;
+ acpi_owner_id owner_id;
+ struct acpi_evaluate_info *info = NULL;
+ u32 aml_length;
+ u8 *aml_start;
+ union acpi_operand_object *method_obj = NULL;
+
+ ACPI_FUNCTION_TRACE(ns_execute_table);
+
+ status = acpi_get_table_by_index(table_index, &table);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Table must consist of at least a complete header */
+
+ if (table->length < sizeof(struct acpi_table_header)) {
+ return_ACPI_STATUS(AE_BAD_HEADER);
+ }
+
+ aml_start = (u8 *)table + sizeof(struct acpi_table_header);
+ aml_length = table->length - sizeof(struct acpi_table_header);
+
+ status = acpi_tb_get_owner_id(table_index, &owner_id);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Create, initialize, and link a new temporary method object */
+
+ method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
+ if (!method_obj) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Allocate the evaluation information block */
+
+ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+ if (!info) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
+ "%s: Create table pseudo-method for [%4.4s] @%p, method %p\n",
+ ACPI_GET_FUNCTION_NAME, table->signature, table,
+ method_obj));
+
+ 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;
+
+ info->pass_number = ACPI_IMODE_EXECUTE;
+ info->node = start_node;
+ info->obj_desc = method_obj;
+ info->node_flags = info->node->flags;
+ info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
+ if (!info->full_pathname) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ status = acpi_ps_execute_table(info);
+
+cleanup:
+ if (info) {
+ ACPI_FREE(info->full_pathname);
+ info->full_pathname = NULL;
+ }
+ ACPI_FREE(info);
+ acpi_ut_remove_reference(method_obj);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: ns_one_complete_parse
+ *
+ * PARAMETERS: pass_number - 1 or 2
+ * table_desc - The table to be parsed.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_one_complete_parse(u32 pass_number,
+ u32 table_index,
+ struct acpi_namespace_node *start_node)
+{
+ union acpi_parse_object *parse_root;
+ acpi_status status;
+ u32 aml_length;
+ u8 *aml_start;
+ struct acpi_walk_state *walk_state;
+ struct acpi_table_header *table;
+ acpi_owner_id owner_id;
+
+ ACPI_FUNCTION_TRACE(ns_one_complete_parse);
+
+ status = acpi_get_table_by_index(table_index, &table);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Table must consist of at least a complete header */
+
+ if (table->length < sizeof(struct acpi_table_header)) {
+ return_ACPI_STATUS(AE_BAD_HEADER);
+ }
+
+ aml_start = (u8 *)table + sizeof(struct acpi_table_header);
+ aml_length = table->length - sizeof(struct acpi_table_header);
+
+ status = acpi_tb_get_owner_id(table_index, &owner_id);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Create and init a Root Node */
+
+ parse_root = acpi_ps_create_scope_op(aml_start);
+ if (!parse_root) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Create and initialize a new walk state */
+
+ walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
+ if (!walk_state) {
+ acpi_ps_free_op(parse_root);
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
+ aml_start, aml_length, NULL,
+ (u8)pass_number);
+ if (ACPI_FAILURE(status)) {
+ acpi_ds_delete_walk_state(walk_state);
+ goto cleanup;
+ }
+
+ /* Found OSDT table, enable the namespace override feature */
+
+ if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT) &&
+ pass_number == ACPI_IMODE_LOAD_PASS1) {
+ walk_state->namespace_override = TRUE;
+ }
+
+ /* start_node is the default location to load the table */
+
+ if (start_node && start_node != acpi_gbl_root_node) {
+ status =
+ acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD,
+ walk_state);
+ if (ACPI_FAILURE(status)) {
+ acpi_ds_delete_walk_state(walk_state);
+ goto cleanup;
+ }
+ }
+
+ /* Parse the AML */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+ "*PARSE* pass %u parse\n", pass_number));
+ acpi_ex_enter_interpreter();
+ status = acpi_ps_parse_aml(walk_state);
+ acpi_ex_exit_interpreter();
+
+cleanup:
+ acpi_ps_delete_parse_tree(parse_root);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_parse_table
+ *
+ * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
+ * start_node - Where to enter the table into the namespace
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ns_parse_table);
+
+ if (acpi_gbl_execute_tables_as_methods) {
+ /*
+ * This case executes the AML table as one large control method.
+ * The point of this is to execute any module-level code in-place
+ * as the table is parsed. Some AML code depends on this behavior.
+ *
+ * It is a run-time option at this time, but will eventually become
+ * the default.
+ *
+ * Note: This causes the table to only have a single-pass parse.
+ * However, this is compatible with other ACPI implementations.
+ */
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
+ "%s: **** Start table execution pass\n",
+ ACPI_GET_FUNCTION_NAME));
+
+ status = acpi_ns_execute_table(table_index, start_node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ } else {
+ /*
+ * AML Parse, pass 1
+ *
+ * In this pass, we load most of the namespace. Control methods
+ * are not parsed until later. A parse tree is not created.
+ * Instead, each Parser Op subtree is deleted when it is finished.
+ * This saves a great deal of memory, and allows a small cache of
+ * parse objects to service the entire parse. The second pass of
+ * the parse then performs another complete parse of the AML.
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
+
+ status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1,
+ table_index, start_node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /*
+ * AML Parse, pass 2
+ *
+ * In this pass, we resolve forward references and other things
+ * that could not be completed during the first pass.
+ * Another complete parse of the AML is performed, but the
+ * overhead of this is compensated for by the fact that the
+ * parse objects are all cached.
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
+ status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2,
+ table_index, start_node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ return_ACPI_STATUS(status);
+}
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