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alistair23-linux/drivers/acpi/dispatcher/dswscope.c
Bob Moore b229cf92ee ACPI: ACPICA 20060421 
Removed a device initialization optimization introduced in
20051216 where the _STA method was not run unless an _INI
was also present for the same device. This optimization
could cause problems because it could allow _INI methods
to be run within a not-present device subtree (If a
not-present device had no _INI, _STA would not be run,
the not-present status would not be discovered, and the
children of the device would be incorrectly traversed.)

Implemented a new _STA optimization where namespace
subtrees that do not contain _INI are identified and
ignored during device initialization. Selectively running
_STA can significantly improve boot time on large machines
(with assistance from Len Brown.)

Implemented support for the device initialization case
where the returned _STA flags indicate a device not-present
but functioning. In this case, _INI is not run, but the
device children are examined for presence, as per the
ACPI specification.

Implemented an additional change to the IndexField support
in order to conform to MS behavior. The value written to
the Index Register is not simply a byte offset, it is a
byte offset in units of the access width of the parent
Index Field. (Fiodor Suietov)

Defined and deployed a new OSL interface,
acpi_os_validate_address().  This interface is called during
the creation of all AML operation regions, and allows
the host OS to exert control over what addresses it will
allow the AML code to access. Operation Regions whose
addresses are disallowed will cause a runtime exception
when they are actually accessed (will not affect or abort
table loading.)

Defined and deployed a new OSL interface,
acpi_os_validate_interface().  This interface allows the host OS
to match the various "optional" interface/behavior strings
for the _OSI predefined control method as appropriate
(with assistance from Bjorn Helgaas.)

Restructured and corrected various problems in the
exception handling code paths within DsCallControlMethod
and DsTerminateControlMethod in dsmethod (with assistance
from Takayoshi Kochi.)

Modified the Linux source converter to ignore quoted string
literals while converting identifiers from mixed to lower
case. This will correct problems with the disassembler
and other areas where such strings must not be modified.

The ACPI_FUNCTION_* macros no longer require quotes around
the function name. This allows the Linux source converter
to convert the names, now that the converter ignores
quoted strings.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-14 02:30:55 -04:00

214 lines
6.6 KiB
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/******************************************************************************
*
* Module Name: dswscope - Scope stack manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, 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")
/****************************************************************************
*
* 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, "[\\___] (%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: 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, "[\\___] (ROOT)\n"));
}
acpi_ut_delete_generic_state(scope_info);
return_ACPI_STATUS(AE_OK);
}
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