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linux/drivers/acpi/acpica/nsrepair2.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: nsrepair2 - Repair for objects returned by specific
* predefined methods
*
* Copyright (C) 2000 - 2018, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsrepair2")
/*
* Information structure and handler for ACPI predefined names that can
* be repaired on a per-name basis.
*/
typedef
acpi_status (*acpi_repair_function) (struct acpi_evaluate_info * info,
union acpi_operand_object **
return_object_ptr);
typedef struct acpi_repair_info {
char name[ACPI_NAME_SIZE];
acpi_repair_function repair_function;
} acpi_repair_info;
/* Local prototypes */
static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
acpi_namespace_node
*node);
static acpi_status
acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_CID(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_CST(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_HID(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr);
static acpi_status
acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
union acpi_operand_object *return_object,
u32 start_index,
u32 expected_count,
u32 sort_index,
u8 sort_direction, char *sort_key_name);
/* Values for sort_direction above */
#define ACPI_SORT_ASCENDING 0
#define ACPI_SORT_DESCENDING 1
static void
acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index);
static void
acpi_ns_sort_list(union acpi_operand_object **elements,
u32 count, u32 index, u8 sort_direction);
/*
* This table contains the names of the predefined methods for which we can
* perform more complex repairs.
*
* As necessary:
*
* _ALR: Sort the list ascending by ambient_illuminance
* _CID: Strings: uppercase all, remove any leading asterisk
* _CST: Sort the list ascending by C state type
* _FDE: Convert Buffer of BYTEs to a Buffer of DWORDs
* _GTM: Convert Buffer of BYTEs to a Buffer of DWORDs
* _HID: Strings: uppercase all, remove any leading asterisk
* _PRT: Fix reversed source_name and source_index
* _PSS: Sort the list descending by Power
* _TSS: Sort the list descending by Power
*
* Names that must be packages, but cannot be sorted:
*
* _BCL: Values are tied to the Package index where they appear, and cannot
* be moved or sorted. These index values are used for _BQC and _BCM.
* However, we can fix the case where a buffer is returned, by converting
* it to a Package of integers.
*/
static const struct acpi_repair_info acpi_ns_repairable_names[] = {
{"_ALR", acpi_ns_repair_ALR},
{"_CID", acpi_ns_repair_CID},
{"_CST", acpi_ns_repair_CST},
{"_FDE", acpi_ns_repair_FDE},
{"_GTM", acpi_ns_repair_FDE}, /* _GTM has same repair as _FDE */
{"_HID", acpi_ns_repair_HID},
{"_PRT", acpi_ns_repair_PRT},
{"_PSS", acpi_ns_repair_PSS},
{"_TSS", acpi_ns_repair_TSS},
{{0, 0, 0, 0}, NULL} /* Table terminator */
};
#define ACPI_FDE_FIELD_COUNT 5
#define ACPI_FDE_BYTE_BUFFER_SIZE 5
#define ACPI_FDE_DWORD_BUFFER_SIZE (ACPI_FDE_FIELD_COUNT * sizeof (u32))
/******************************************************************************
*
* FUNCTION: acpi_ns_complex_repairs
*
* PARAMETERS: info - Method execution information block
* node - Namespace node for the method/object
* validate_status - Original status of earlier validation
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if repair was successful. If name is not
* matched, validate_status is returned.
*
* DESCRIPTION: Attempt to repair/convert a return object of a type that was
* not expected.
*
*****************************************************************************/
acpi_status
acpi_ns_complex_repairs(struct acpi_evaluate_info *info,
struct acpi_namespace_node *node,
acpi_status validate_status,
union acpi_operand_object **return_object_ptr)
{
const struct acpi_repair_info *predefined;
acpi_status status;
/* Check if this name is in the list of repairable names */
predefined = acpi_ns_match_complex_repair(node);
if (!predefined) {
return (validate_status);
}
status = predefined->repair_function(info, return_object_ptr);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_match_complex_repair
*
* PARAMETERS: node - Namespace node for the method/object
*
* RETURN: Pointer to entry in repair table. NULL indicates not found.
*
* DESCRIPTION: Check an object name against the repairable object list.
*
*****************************************************************************/
static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
acpi_namespace_node
*node)
{
const struct acpi_repair_info *this_name;
/* Search info table for a repairable predefined method/object name */
this_name = acpi_ns_repairable_names;
while (this_name->repair_function) {
if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) {
return (this_name);
}
this_name++;
}
return (NULL); /* Not found */
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_ALR
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list
* ascending by the ambient illuminance values.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status;
status = acpi_ns_check_sorted_list(info, return_object, 0, 2, 1,
ACPI_SORT_ASCENDING,
"AmbientIlluminance");
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_FDE
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _FDE and _GTM objects. The expected return
* value is a Buffer of 5 DWORDs. This function repairs a common
* problem where the return value is a Buffer of BYTEs, not
* DWORDs.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object *buffer_object;
u8 *byte_buffer;
u32 *dword_buffer;
u32 i;
ACPI_FUNCTION_NAME(ns_repair_FDE);
switch (return_object->common.type) {
case ACPI_TYPE_BUFFER:
/* This is the expected type. Length should be (at least) 5 DWORDs */
if (return_object->buffer.length >= ACPI_FDE_DWORD_BUFFER_SIZE) {
return (AE_OK);
}
/* We can only repair if we have exactly 5 BYTEs */
if (return_object->buffer.length != ACPI_FDE_BYTE_BUFFER_SIZE) {
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname,
info->node_flags,
"Incorrect return buffer length %u, expected %u",
return_object->buffer.length,
ACPI_FDE_DWORD_BUFFER_SIZE));
return (AE_AML_OPERAND_TYPE);
}
/* Create the new (larger) buffer object */
buffer_object =
acpi_ut_create_buffer_object(ACPI_FDE_DWORD_BUFFER_SIZE);
if (!buffer_object) {
return (AE_NO_MEMORY);
}
/* Expand each byte to a DWORD */
byte_buffer = return_object->buffer.pointer;
dword_buffer = ACPI_CAST_PTR(u32,
buffer_object->buffer.pointer);
for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++) {
*dword_buffer = (u32) *byte_buffer;
dword_buffer++;
byte_buffer++;
}
ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
"%s Expanded Byte Buffer to expected DWord Buffer\n",
info->full_pathname));
break;
default:
return (AE_AML_OPERAND_TYPE);
}
/* Delete the original return object, return the new buffer object */
acpi_ut_remove_reference(return_object);
*return_object_ptr = buffer_object;
info->return_flags |= ACPI_OBJECT_REPAIRED;
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_CID
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _CID object. If a string, ensure that all
* letters are uppercase and that there is no leading asterisk.
* If a Package, ensure same for all string elements.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_CID(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
acpi_status status;
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object **element_ptr;
union acpi_operand_object *original_element;
u16 original_ref_count;
u32 i;
/* Check for _CID as a simple string */
if (return_object->common.type == ACPI_TYPE_STRING) {
status = acpi_ns_repair_HID(info, return_object_ptr);
return (status);
}
/* Exit if not a Package */
if (return_object->common.type != ACPI_TYPE_PACKAGE) {
return (AE_OK);
}
/* Examine each element of the _CID package */
element_ptr = return_object->package.elements;
for (i = 0; i < return_object->package.count; i++) {
original_element = *element_ptr;
original_ref_count = original_element->common.reference_count;
status = acpi_ns_repair_HID(info, element_ptr);
if (ACPI_FAILURE(status)) {
return (status);
}
if (original_element != *element_ptr) {
/* Update reference count of new object */
(*element_ptr)->common.reference_count =
original_ref_count;
}
element_ptr++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_CST
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _CST object:
* 1. Sort the list ascending by C state type
* 2. Ensure type cannot be zero
* 3. A subpackage count of zero means _CST is meaningless
* 4. Count must match the number of C state subpackages
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_CST(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object **outer_elements;
u32 outer_element_count;
union acpi_operand_object *obj_desc;
acpi_status status;
u8 removing;
u32 i;
ACPI_FUNCTION_NAME(ns_repair_CST);
/*
* Check if the C-state type values are proportional.
*/
outer_element_count = return_object->package.count - 1;
i = 0;
while (i < outer_element_count) {
outer_elements = &return_object->package.elements[i + 1];
removing = FALSE;
if ((*outer_elements)->package.count == 0) {
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname,
info->node_flags,
"SubPackage[%u] - removing entry due to zero count",
i));
removing = TRUE;
goto remove_element;
}
obj_desc = (*outer_elements)->package.elements[1]; /* Index1 = Type */
if ((u32)obj_desc->integer.value == 0) {
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname,
info->node_flags,
"SubPackage[%u] - removing entry due to invalid Type(0)",
i));
removing = TRUE;
}
remove_element:
if (removing) {
acpi_ns_remove_element(return_object, i + 1);
outer_element_count--;
} else {
i++;
}
}
/* Update top-level package count, Type "Integer" checked elsewhere */
obj_desc = return_object->package.elements[0];
obj_desc->integer.value = outer_element_count;
/*
* Entries (subpackages) in the _CST Package must be sorted by the
* C-state type, in ascending order.
*/
status = acpi_ns_check_sorted_list(info, return_object, 1, 4, 1,
ACPI_SORT_ASCENDING, "C-State Type");
if (ACPI_FAILURE(status)) {
return (status);
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_HID
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _HID object. If a string, ensure that all
* letters are uppercase and that there is no leading asterisk.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_HID(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object *new_string;
char *source;
char *dest;
ACPI_FUNCTION_NAME(ns_repair_HID);
/* We only care about string _HID objects (not integers) */
if (return_object->common.type != ACPI_TYPE_STRING) {
return (AE_OK);
}
if (return_object->string.length == 0) {
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname, info->node_flags,
"Invalid zero-length _HID or _CID string"));
/* Return AE_OK anyway, let driver handle it */
info->return_flags |= ACPI_OBJECT_REPAIRED;
return (AE_OK);
}
/* It is simplest to always create a new string object */
new_string = acpi_ut_create_string_object(return_object->string.length);
if (!new_string) {
return (AE_NO_MEMORY);
}
/*
* Remove a leading asterisk if present. For some unknown reason, there
* are many machines in the field that contains IDs like this.
*
* Examples: "*PNP0C03", "*ACPI0003"
*/
source = return_object->string.pointer;
if (*source == '*') {
source++;
new_string->string.length--;
ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
"%s: Removed invalid leading asterisk\n",
info->full_pathname));
}
/*
* Copy and uppercase the string. From the ACPI 5.0 specification:
*
* A valid PNP ID must be of the form "AAA####" where A is an uppercase
* letter and # is a hex digit. A valid ACPI ID must be of the form
* "NNNN####" where N is an uppercase letter or decimal digit, and
* # is a hex digit.
*/
for (dest = new_string->string.pointer; *source; dest++, source++) {
*dest = (char)toupper((int)*source);
}
acpi_ut_remove_reference(return_object);
*return_object_ptr = new_string;
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_PRT
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _PRT object. If necessary, fix reversed
* source_name and source_index field, a common BIOS bug.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *package_object = *return_object_ptr;
union acpi_operand_object **top_object_list;
union acpi_operand_object **sub_object_list;
union acpi_operand_object *obj_desc;
union acpi_operand_object *sub_package;
u32 element_count;
u32 index;
/* Each element in the _PRT package is a subpackage */
top_object_list = package_object->package.elements;
element_count = package_object->package.count;
/* Examine each subpackage */
for (index = 0; index < element_count; index++, top_object_list++) {
sub_package = *top_object_list;
sub_object_list = sub_package->package.elements;
/* Check for minimum required element count */
if (sub_package->package.count < 4) {
continue;
}
/*
* If the BIOS has erroneously reversed the _PRT source_name (index 2)
* and the source_index (index 3), fix it. _PRT is important enough to
* workaround this BIOS error. This also provides compatibility with
* other ACPI implementations.
*/
obj_desc = sub_object_list[3];
if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
sub_object_list[3] = sub_object_list[2];
sub_object_list[2] = obj_desc;
info->return_flags |= ACPI_OBJECT_REPAIRED;
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname,
info->node_flags,
"PRT[%X]: Fixed reversed SourceName and SourceIndex",
index));
}
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_PSS
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list
* by the CPU frequencies. Check that the power dissipation values
* are all proportional to CPU frequency (i.e., sorting by
* frequency should be the same as sorting by power.)
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object **outer_elements;
u32 outer_element_count;
union acpi_operand_object **elements;
union acpi_operand_object *obj_desc;
u32 previous_value;
acpi_status status;
u32 i;
/*
* Entries (subpackages) in the _PSS Package must be sorted by power
* dissipation, in descending order. If it appears that the list is
* incorrectly sorted, sort it. We sort by cpu_frequency, since this
* should be proportional to the power.
*/
status = acpi_ns_check_sorted_list(info, return_object, 0, 6, 0,
ACPI_SORT_DESCENDING,
"CpuFrequency");
if (ACPI_FAILURE(status)) {
return (status);
}
/*
* We now know the list is correctly sorted by CPU frequency. Check if
* the power dissipation values are proportional.
*/
previous_value = ACPI_UINT32_MAX;
outer_elements = return_object->package.elements;
outer_element_count = return_object->package.count;
for (i = 0; i < outer_element_count; i++) {
elements = (*outer_elements)->package.elements;
obj_desc = elements[1]; /* Index1 = power_dissipation */
if ((u32)obj_desc->integer.value > previous_value) {
ACPI_WARN_PREDEFINED((AE_INFO,
info->full_pathname,
info->node_flags,
"SubPackage[%u,%u] - suspicious power dissipation values",
i - 1, i));
}
previous_value = (u32) obj_desc->integer.value;
outer_elements++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_repair_TSS
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if object is OK or was repaired successfully
*
* DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list
* descending by the power dissipation values.
*
*****************************************************************************/
static acpi_status
acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status;
struct acpi_namespace_node *node;
/*
* We can only sort the _TSS return package if there is no _PSS in the
* same scope. This is because if _PSS is present, the ACPI specification
* dictates that the _TSS Power Dissipation field is to be ignored, and
* therefore some BIOSs leave garbage values in the _TSS Power field(s).
* In this case, it is best to just return the _TSS package as-is.
* (May, 2011)
*/
status = acpi_ns_get_node(info->node, "^_PSS",
ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_SUCCESS(status)) {
return (AE_OK);
}
status = acpi_ns_check_sorted_list(info, return_object, 0, 5, 1,
ACPI_SORT_DESCENDING,
"PowerDissipation");
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_check_sorted_list
*
* PARAMETERS: info - Method execution information block
* return_object - Pointer to the top-level returned object
* start_index - Index of the first subpackage
* expected_count - Minimum length of each subpackage
* sort_index - Subpackage entry to sort on
* sort_direction - Ascending or descending
* sort_key_name - Name of the sort_index field
*
* RETURN: Status. AE_OK if the list is valid and is sorted correctly or
* has been repaired by sorting the list.
*
* DESCRIPTION: Check if the package list is valid and sorted correctly by the
* sort_index. If not, then sort the list.
*
*****************************************************************************/
static acpi_status
acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
union acpi_operand_object *return_object,
u32 start_index,
u32 expected_count,
u32 sort_index,
u8 sort_direction, char *sort_key_name)
{
u32 outer_element_count;
union acpi_operand_object **outer_elements;
union acpi_operand_object **elements;
union acpi_operand_object *obj_desc;
u32 i;
u32 previous_value;
ACPI_FUNCTION_NAME(ns_check_sorted_list);
/* The top-level object must be a package */
if (return_object->common.type != ACPI_TYPE_PACKAGE) {
return (AE_AML_OPERAND_TYPE);
}
/*
* NOTE: assumes list of subpackages contains no NULL elements.
* Any NULL elements should have been removed by earlier call
* to acpi_ns_remove_null_elements.
*/
outer_element_count = return_object->package.count;
if (!outer_element_count || start_index >= outer_element_count) {
return (AE_AML_PACKAGE_LIMIT);
}
outer_elements = &return_object->package.elements[start_index];
outer_element_count -= start_index;
previous_value = 0;
if (sort_direction == ACPI_SORT_DESCENDING) {
previous_value = ACPI_UINT32_MAX;
}
/* Examine each subpackage */
for (i = 0; i < outer_element_count; i++) {
/* Each element of the top-level package must also be a package */
if ((*outer_elements)->common.type != ACPI_TYPE_PACKAGE) {
return (AE_AML_OPERAND_TYPE);
}
/* Each subpackage must have the minimum length */
if ((*outer_elements)->package.count < expected_count) {
return (AE_AML_PACKAGE_LIMIT);
}
elements = (*outer_elements)->package.elements;
obj_desc = elements[sort_index];
if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
return (AE_AML_OPERAND_TYPE);
}
/*
* The list must be sorted in the specified order. If we detect a
* discrepancy, sort the entire list.
*/
if (((sort_direction == ACPI_SORT_ASCENDING) &&
(obj_desc->integer.value < previous_value)) ||
((sort_direction == ACPI_SORT_DESCENDING) &&
(obj_desc->integer.value > previous_value))) {
acpi_ns_sort_list(&return_object->package.
elements[start_index],
outer_element_count, sort_index,
sort_direction);
info->return_flags |= ACPI_OBJECT_REPAIRED;
ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
"%s: Repaired unsorted list - now sorted by %s\n",
info->full_pathname, sort_key_name));
return (AE_OK);
}
previous_value = (u32) obj_desc->integer.value;
outer_elements++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_ns_sort_list
*
* PARAMETERS: elements - Package object element list
* count - Element count for above
* index - Sort by which package element
* sort_direction - Ascending or Descending sort
*
* RETURN: None
*
* DESCRIPTION: Sort the objects that are in a package element list.
*
* NOTE: Assumes that all NULL elements have been removed from the package,
* and that all elements have been verified to be of type Integer.
*
*****************************************************************************/
static void
acpi_ns_sort_list(union acpi_operand_object **elements,
u32 count, u32 index, u8 sort_direction)
{
union acpi_operand_object *obj_desc1;
union acpi_operand_object *obj_desc2;
union acpi_operand_object *temp_obj;
u32 i;
u32 j;
/* Simple bubble sort */
for (i = 1; i < count; i++) {
for (j = (count - 1); j >= i; j--) {
obj_desc1 = elements[j - 1]->package.elements[index];
obj_desc2 = elements[j]->package.elements[index];
if (((sort_direction == ACPI_SORT_ASCENDING) &&
(obj_desc1->integer.value >
obj_desc2->integer.value))
|| ((sort_direction == ACPI_SORT_DESCENDING)
&& (obj_desc1->integer.value <
obj_desc2->integer.value))) {
temp_obj = elements[j - 1];
elements[j - 1] = elements[j];
elements[j] = temp_obj;
}
}
}
}
/******************************************************************************
*
* FUNCTION: acpi_ns_remove_element
*
* PARAMETERS: obj_desc - Package object element list
* index - Index of element to remove
*
* RETURN: None
*
* DESCRIPTION: Remove the requested element of a package and delete it.
*
*****************************************************************************/
static void
acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index)
{
union acpi_operand_object **source;
union acpi_operand_object **dest;
u32 count;
u32 new_count;
u32 i;
ACPI_FUNCTION_NAME(ns_remove_element);
count = obj_desc->package.count;
new_count = count - 1;
source = obj_desc->package.elements;
dest = source;
/* Examine all elements of the package object, remove matched index */
for (i = 0; i < count; i++) {
if (i == index) {
acpi_ut_remove_reference(*source); /* Remove one ref for being in pkg */
acpi_ut_remove_reference(*source);
} else {
*dest = *source;
dest++;
}
source++;
}
/* NULL terminate list and update the package count */
*dest = NULL;
obj_desc->package.count = new_count;
}
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