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Diffstat (limited to 'drivers/acpi/dispatcher/dswscope.c')
| -rw-r--r-- | drivers/acpi/dispatcher/dswscope.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/acpi/dispatcher/dswscope.c b/drivers/acpi/dispatcher/dswscope.c new file mode 100644 index 00000000000..65f456151e2 --- /dev/null +++ b/drivers/acpi/dispatcher/dswscope.c @@ -0,0 +1,229 @@ +/****************************************************************************** + * + * Module Name: dswscope - Scope stack manipulation + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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. + */ + + +#include <acpi/acpi.h> +#include <acpi/acdispat.h> + + +#define _COMPONENT ACPI_DISPATCHER + ACPI_MODULE_NAME ("dswscope") + + +#define STACK_POP(head) head + + +/**************************************************************************** + * + * FUNCTION: acpi_ds_scope_stack_clear + * + * PARAMETERS: 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 + * + * 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_REPORT_ERROR (("ds_scope_stack_push: null scope passed\n")); + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* Make sure object type is valid */ + + if (!acpi_ut_valid_object_type (type)) { + ACPI_REPORT_WARNING (("ds_scope_stack_push: Invalid object type: 0x%X\n", 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.data_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, + "[\\___] (%s)", "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: Type - The type of frame to be found + * + * DESCRIPTION: Pop the scope stack until a frame of the requested type + * is found. + * + * RETURN: Count of frames popped. If no frame of the requested type + * was found, the count is returned as a negative number and + * the scope stack is emptied (which sets the current scope + * to the root). If the scope stack was empty at entry, the + * function is a no-op and returns 0. + * + ***************************************************************************/ + +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, + "[\\___] (ROOT)\n")); + } + + acpi_ut_delete_generic_state (scope_info); + return_ACPI_STATUS (AE_OK); +} + + |