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Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/acpica/dswscope.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/dswscope.c b/drivers/acpi/acpica/dswscope.c new file mode 100644 index 000000000..7592176a8 --- /dev/null +++ b/drivers/acpi/acpica/dswscope.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: dswscope - Scope stack manipulation + * + * Copyright (C) 2000 - 2018, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acdispat.h" + +#define _COMPONENT ACPI_DISPATCHER +ACPI_MODULE_NAME("dswscope") + +/**************************************************************************** + * + * FUNCTION: acpi_ds_scope_stack_clear + * + * PARAMETERS: walk_state - Current state + * + * RETURN: None + * + * DESCRIPTION: Pop (and free) everything on the scope stack except the + * root scope object (which remains at the stack top.) + * + ***************************************************************************/ +void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state) +{ + union acpi_generic_state *scope_info; + + ACPI_FUNCTION_NAME(ds_scope_stack_clear); + + while (walk_state->scope_info) { + + /* Pop a scope off the stack */ + + scope_info = walk_state->scope_info; + walk_state->scope_info = scope_info->scope.next; + + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "Popped object type (%s)\n", + acpi_ut_get_type_name(scope_info->common. + value))); + + acpi_ut_delete_generic_state(scope_info); + } +} + +/**************************************************************************** + * + * FUNCTION: acpi_ds_scope_stack_push + * + * PARAMETERS: node - Name to be made current + * type - Type of frame being pushed + * walk_state - Current state + * + * RETURN: Status + * + * DESCRIPTION: Push the current scope on the scope stack, and make the + * passed Node current. + * + ***************************************************************************/ + +acpi_status +acpi_ds_scope_stack_push(struct acpi_namespace_node *node, + acpi_object_type type, + struct acpi_walk_state *walk_state) +{ + union acpi_generic_state *scope_info; + union acpi_generic_state *old_scope_info; + + ACPI_FUNCTION_TRACE(ds_scope_stack_push); + + if (!node) { + + /* Invalid scope */ + + ACPI_ERROR((AE_INFO, "Null scope parameter")); + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Make sure object type is valid */ + + if (!acpi_ut_valid_object_type(type)) { + ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type)); + } + + /* Allocate a new scope object */ + + scope_info = acpi_ut_create_generic_state(); + if (!scope_info) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Init new scope object */ + + scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE; + scope_info->scope.node = node; + scope_info->common.value = (u16) type; + + walk_state->scope_depth++; + + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "[%.2d] Pushed scope ", + (u32) walk_state->scope_depth)); + + old_scope_info = walk_state->scope_info; + if (old_scope_info) { + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, + "[%4.4s] (%s)", + acpi_ut_get_node_name(old_scope_info-> + scope.node), + acpi_ut_get_type_name(old_scope_info-> + common.value))); + } else { + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, ACPI_NAMESPACE_ROOT)); + } + + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, + ", New scope -> [%4.4s] (%s)\n", + acpi_ut_get_node_name(scope_info->scope.node), + acpi_ut_get_type_name(scope_info->common.value))); + + /* Push new scope object onto stack */ + + acpi_ut_push_generic_state(&walk_state->scope_info, scope_info); + return_ACPI_STATUS(AE_OK); +} + +/**************************************************************************** + * + * FUNCTION: acpi_ds_scope_stack_pop + * + * PARAMETERS: walk_state - Current state + * + * RETURN: Status + * + * DESCRIPTION: Pop the scope stack once. + * + ***************************************************************************/ + +acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state) +{ + union acpi_generic_state *scope_info; + union acpi_generic_state *new_scope_info; + + ACPI_FUNCTION_TRACE(ds_scope_stack_pop); + + /* + * Pop scope info object off the stack. + */ + scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info); + if (!scope_info) { + return_ACPI_STATUS(AE_STACK_UNDERFLOW); + } + + walk_state->scope_depth--; + + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "[%.2d] Popped scope [%4.4s] (%s), New scope -> ", + (u32) walk_state->scope_depth, + acpi_ut_get_node_name(scope_info->scope.node), + acpi_ut_get_type_name(scope_info->common.value))); + + new_scope_info = walk_state->scope_info; + if (new_scope_info) { + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[%4.4s] (%s)\n", + acpi_ut_get_node_name(new_scope_info-> + scope.node), + acpi_ut_get_type_name(new_scope_info-> + common.value))); + } else { + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "%s\n", + ACPI_NAMESPACE_ROOT)); + } + + acpi_ut_delete_generic_state(scope_info); + return_ACPI_STATUS(AE_OK); +} |