linux/drivers/acpi/utilities/utmisc.c
Bob Moore 28f55ebce5 [ACPI] ACPICA 20051202
Modified the parsing of control methods to no longer
create namespace objects during the first pass of the
parse. Objects are now created only during the execute
phase, at the moment the namespace creation operator
is encountered in the AML (Name, OperationRegion,
CreateByteField, etc.) This should eliminate ALREADY_EXISTS
exceptions seen on some machines where reentrant control
methods are protected by an AML mutex. The mutex will now
correctly block multiple threads from attempting to create
the same object more than once.

Increased the number of available Owner Ids for namespace
object tracking from 32 to 255. This should eliminate the
OWNER_ID_LIMIT exceptions seen on some machines with a
large number of ACPI tables (either static or dynamic).

Enhanced the namespace dump routine to output the owner
ID for each namespace object.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-12-10 00:29:11 -05:00

898 lines
23 KiB
C

/*******************************************************************************
*
* Module Name: utmisc - common utility procedures
*
******************************************************************************/
/*
* 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/acnamesp.h>
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utmisc")
/*******************************************************************************
*
* FUNCTION: acpi_ut_allocate_owner_id
*
* PARAMETERS: owner_id - Where the new owner ID is returned
*
* RETURN: Status
*
* DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
* track objects created by the table or method, to be deleted
* when the method exits or the table is unloaded.
*
******************************************************************************/
acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
{
acpi_native_uint i;
acpi_native_uint j;
acpi_native_uint k;
acpi_status status;
ACPI_FUNCTION_TRACE("ut_allocate_owner_id");
/* Guard against multiple allocations of ID to the same location */
if (*owner_id) {
ACPI_REPORT_ERROR(("Owner ID [%2.2X] already exists\n",
*owner_id));
return_ACPI_STATUS(AE_ALREADY_EXISTS);
}
/* Mutex for the global ID mask */
status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Find a free owner ID, cycle through all possible IDs on repeated
* allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index may have
* to be scanned twice.
*/
for (i = 0, j = acpi_gbl_last_owner_id_index;
i < (ACPI_NUM_OWNERID_MASKS + 1); i++, j++) {
if (j >= ACPI_NUM_OWNERID_MASKS) {
j = 0; /* Wraparound to start of mask array */
}
for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
/* There are no free IDs in this mask */
break;
}
if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
/*
* Found a free ID. The actual ID is the bit index plus one,
* making zero an invalid Owner ID. Save this as the last ID
* allocated and update the global ID mask.
*/
acpi_gbl_owner_id_mask[j] |= (1 << k);
acpi_gbl_last_owner_id_index = (u8) j;
acpi_gbl_next_owner_id_offset = (u8) (k + 1);
/*
* Construct encoded ID from the index and bit position
*
* Note: Last [j].k (bit 255) is never used and is marked
* permanently allocated (prevents +1 overflow)
*/
*owner_id =
(acpi_owner_id) ((k + 1) + ACPI_MUL_32(j));
ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
"Allocated owner_id: %2.2X\n",
(unsigned int)*owner_id));
goto exit;
}
}
acpi_gbl_next_owner_id_offset = 0;
}
/*
* All owner_ids have been allocated. This typically should
* not happen since the IDs are reused after deallocation. The IDs are
* allocated upon table load (one per table) and method execution, and
* they are released when a table is unloaded or a method completes
* execution.
*
* If this error happens, there may be very deep nesting of invoked control
* methods, or there may be a bug where the IDs are not released.
*/
status = AE_OWNER_ID_LIMIT;
ACPI_REPORT_ERROR(("Could not allocate new owner_id (255 max), AE_OWNER_ID_LIMIT\n"));
exit:
(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_release_owner_id
*
* PARAMETERS: owner_id_ptr - Pointer to a previously allocated owner_iD
*
* RETURN: None. No error is returned because we are either exiting a
* control method or unloading a table. Either way, we would
* ignore any error anyway.
*
* DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
*
******************************************************************************/
void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
{
acpi_owner_id owner_id = *owner_id_ptr;
acpi_status status;
acpi_native_uint index;
u32 bit;
ACPI_FUNCTION_TRACE_U32("ut_release_owner_id", owner_id);
/* Always clear the input owner_id (zero is an invalid ID) */
*owner_id_ptr = 0;
/* Zero is not a valid owner_iD */
if ((owner_id == 0) || (owner_id > 255)) {
ACPI_REPORT_ERROR(("Invalid owner_id: %2.2X\n", owner_id));
return_VOID;
}
/* Mutex for the global ID mask */
status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
if (ACPI_FAILURE(status)) {
return_VOID;
}
/* Normalize the ID to zero */
owner_id--;
/* Decode ID to index/offset pair */
index = ACPI_DIV_32(owner_id);
bit = 1 << ACPI_MOD_32(owner_id);
/* Free the owner ID only if it is valid */
if (acpi_gbl_owner_id_mask[index] & bit) {
acpi_gbl_owner_id_mask[index] ^= bit;
} else {
ACPI_REPORT_ERROR(("Release of non-allocated owner_id: %2.2X\n",
owner_id + 1));
}
(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_strupr (strupr)
*
* PARAMETERS: src_string - The source string to convert
*
* RETURN: None
*
* DESCRIPTION: Convert string to uppercase
*
* NOTE: This is not a POSIX function, so it appears here, not in utclib.c
*
******************************************************************************/
void acpi_ut_strupr(char *src_string)
{
char *string;
ACPI_FUNCTION_ENTRY();
if (!src_string) {
return;
}
/* Walk entire string, uppercasing the letters */
for (string = src_string; *string; string++) {
*string = (char)ACPI_TOUPPER(*string);
}
return;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_print_string
*
* PARAMETERS: String - Null terminated ASCII string
* max_length - Maximum output length
*
* RETURN: None
*
* DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
* sequences.
*
******************************************************************************/
void acpi_ut_print_string(char *string, u8 max_length)
{
u32 i;
if (!string) {
acpi_os_printf("<\"NULL STRING PTR\">");
return;
}
acpi_os_printf("\"");
for (i = 0; string[i] && (i < max_length); i++) {
/* Escape sequences */
switch (string[i]) {
case 0x07:
acpi_os_printf("\\a"); /* BELL */
break;
case 0x08:
acpi_os_printf("\\b"); /* BACKSPACE */
break;
case 0x0C:
acpi_os_printf("\\f"); /* FORMFEED */
break;
case 0x0A:
acpi_os_printf("\\n"); /* LINEFEED */
break;
case 0x0D:
acpi_os_printf("\\r"); /* CARRIAGE RETURN */
break;
case 0x09:
acpi_os_printf("\\t"); /* HORIZONTAL TAB */
break;
case 0x0B:
acpi_os_printf("\\v"); /* VERTICAL TAB */
break;
case '\'': /* Single Quote */
case '\"': /* Double Quote */
case '\\': /* Backslash */
acpi_os_printf("\\%c", (int)string[i]);
break;
default:
/* Check for printable character or hex escape */
if (ACPI_IS_PRINT(string[i])) {
/* This is a normal character */
acpi_os_printf("%c", (int)string[i]);
} else {
/* All others will be Hex escapes */
acpi_os_printf("\\x%2.2X", (s32) string[i]);
}
break;
}
}
acpi_os_printf("\"");
if (i == max_length && string[i]) {
acpi_os_printf("...");
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_dword_byte_swap
*
* PARAMETERS: Value - Value to be converted
*
* RETURN: u32 integer with bytes swapped
*
* DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
*
******************************************************************************/
u32 acpi_ut_dword_byte_swap(u32 value)
{
union {
u32 value;
u8 bytes[4];
} out;
union {
u32 value;
u8 bytes[4];
} in;
ACPI_FUNCTION_ENTRY();
in.value = value;
out.bytes[0] = in.bytes[3];
out.bytes[1] = in.bytes[2];
out.bytes[2] = in.bytes[1];
out.bytes[3] = in.bytes[0];
return (out.value);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_set_integer_width
*
* PARAMETERS: Revision From DSDT header
*
* RETURN: None
*
* DESCRIPTION: Set the global integer bit width based upon the revision
* of the DSDT. For Revision 1 and 0, Integers are 32 bits.
* For Revision 2 and above, Integers are 64 bits. Yes, this
* makes a difference.
*
******************************************************************************/
void acpi_ut_set_integer_width(u8 revision)
{
if (revision <= 1) {
acpi_gbl_integer_bit_width = 32;
acpi_gbl_integer_nybble_width = 8;
acpi_gbl_integer_byte_width = 4;
} else {
acpi_gbl_integer_bit_width = 64;
acpi_gbl_integer_nybble_width = 16;
acpi_gbl_integer_byte_width = 8;
}
}
#ifdef ACPI_DEBUG_OUTPUT
/*******************************************************************************
*
* FUNCTION: acpi_ut_display_init_pathname
*
* PARAMETERS: Type - Object type of the node
* obj_handle - Handle whose pathname will be displayed
* Path - Additional path string to be appended.
* (NULL if no extra path)
*
* RETURN: acpi_status
*
* DESCRIPTION: Display full pathname of an object, DEBUG ONLY
*
******************************************************************************/
void
acpi_ut_display_init_pathname(u8 type,
struct acpi_namespace_node *obj_handle,
char *path)
{
acpi_status status;
struct acpi_buffer buffer;
ACPI_FUNCTION_ENTRY();
/* Only print the path if the appropriate debug level is enabled */
if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
return;
}
/* Get the full pathname to the node */
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
if (ACPI_FAILURE(status)) {
return;
}
/* Print what we're doing */
switch (type) {
case ACPI_TYPE_METHOD:
acpi_os_printf("Executing ");
break;
default:
acpi_os_printf("Initializing ");
break;
}
/* Print the object type and pathname */
acpi_os_printf("%-12s %s",
acpi_ut_get_type_name(type), (char *)buffer.pointer);
/* Extra path is used to append names like _STA, _INI, etc. */
if (path) {
acpi_os_printf(".%s", path);
}
acpi_os_printf("\n");
ACPI_MEM_FREE(buffer.pointer);
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ut_valid_acpi_name
*
* PARAMETERS: Name - The name to be examined
*
* RETURN: TRUE if the name is valid, FALSE otherwise
*
* DESCRIPTION: Check for a valid ACPI name. Each character must be one of:
* 1) Upper case alpha
* 2) numeric
* 3) underscore
*
******************************************************************************/
u8 acpi_ut_valid_acpi_name(u32 name)
{
char *name_ptr = (char *)&name;
char character;
acpi_native_uint i;
ACPI_FUNCTION_ENTRY();
for (i = 0; i < ACPI_NAME_SIZE; i++) {
character = *name_ptr;
name_ptr++;
if (!((character == '_') ||
(character >= 'A' && character <= 'Z') ||
(character >= '0' && character <= '9'))) {
return (FALSE);
}
}
return (TRUE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_valid_acpi_character
*
* PARAMETERS: Character - The character to be examined
*
* RETURN: 1 if Character may appear in a name, else 0
*
* DESCRIPTION: Check for a printable character
*
******************************************************************************/
u8 acpi_ut_valid_acpi_character(char character)
{
ACPI_FUNCTION_ENTRY();
return ((u8) ((character == '_') ||
(character >= 'A' && character <= 'Z') ||
(character >= '0' && character <= '9')));
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_strtoul64
*
* PARAMETERS: String - Null terminated string
* Base - Radix of the string: 10, 16, or ACPI_ANY_BASE
* ret_integer - Where the converted integer is returned
*
* RETURN: Status and Converted value
*
* DESCRIPTION: Convert a string into an unsigned value.
* NOTE: Does not support Octal strings, not needed.
*
******************************************************************************/
acpi_status
acpi_ut_strtoul64(char *string, u32 base, acpi_integer * ret_integer)
{
u32 this_digit = 0;
acpi_integer return_value = 0;
acpi_integer quotient;
ACPI_FUNCTION_TRACE("ut_stroul64");
if ((!string) || !(*string)) {
goto error_exit;
}
switch (base) {
case ACPI_ANY_BASE:
case 10:
case 16:
break;
default:
/* Invalid Base */
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Skip over any white space in the buffer */
while (ACPI_IS_SPACE(*string) || *string == '\t') {
string++;
}
/*
* If the input parameter Base is zero, then we need to
* determine if it is decimal or hexadecimal:
*/
if (base == 0) {
if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
base = 16;
string += 2;
} else {
base = 10;
}
}
/*
* For hexadecimal base, skip over the leading
* 0 or 0x, if they are present.
*/
if ((base == 16) &&
(*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
string += 2;
}
/* Any string left? */
if (!(*string)) {
goto error_exit;
}
/* Main loop: convert the string to a 64-bit integer */
while (*string) {
if (ACPI_IS_DIGIT(*string)) {
/* Convert ASCII 0-9 to Decimal value */
this_digit = ((u8) * string) - '0';
} else {
if (base == 10) {
/* Digit is out of range */
goto error_exit;
}
this_digit = (u8) ACPI_TOUPPER(*string);
if (ACPI_IS_XDIGIT((char)this_digit)) {
/* Convert ASCII Hex char to value */
this_digit = this_digit - 'A' + 10;
} else {
/*
* We allow non-hex chars, just stop now, same as end-of-string.
* See ACPI spec, string-to-integer conversion.
*/
break;
}
}
/* Divide the digit into the correct position */
(void)
acpi_ut_short_divide((ACPI_INTEGER_MAX -
(acpi_integer) this_digit), base,
&quotient, NULL);
if (return_value > quotient) {
goto error_exit;
}
return_value *= base;
return_value += this_digit;
string++;
}
/* All done, normal exit */
*ret_integer = return_value;
return_ACPI_STATUS(AE_OK);
error_exit:
/* Base was set/validated above */
if (base == 10) {
return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
} else {
return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_create_update_state_and_push
*
* PARAMETERS: Object - Object to be added to the new state
* Action - Increment/Decrement
* state_list - List the state will be added to
*
* RETURN: Status
*
* DESCRIPTION: Create a new state and push it
*
******************************************************************************/
acpi_status
acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
u16 action,
union acpi_generic_state **state_list)
{
union acpi_generic_state *state;
ACPI_FUNCTION_ENTRY();
/* Ignore null objects; these are expected */
if (!object) {
return (AE_OK);
}
state = acpi_ut_create_update_state(object, action);
if (!state) {
return (AE_NO_MEMORY);
}
acpi_ut_push_generic_state(state_list, state);
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_walk_package_tree
*
* PARAMETERS: source_object - The package to walk
* target_object - Target object (if package is being copied)
* walk_callback - Called once for each package element
* Context - Passed to the callback function
*
* RETURN: Status
*
* DESCRIPTION: Walk through a package
*
******************************************************************************/
acpi_status
acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
void *target_object,
acpi_pkg_callback walk_callback, void *context)
{
acpi_status status = AE_OK;
union acpi_generic_state *state_list = NULL;
union acpi_generic_state *state;
u32 this_index;
union acpi_operand_object *this_source_obj;
ACPI_FUNCTION_TRACE("ut_walk_package_tree");
state = acpi_ut_create_pkg_state(source_object, target_object, 0);
if (!state) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
while (state) {
/* Get one element of the package */
this_index = state->pkg.index;
this_source_obj = (union acpi_operand_object *)
state->pkg.source_object->package.elements[this_index];
/*
* Check for:
* 1) An uninitialized package element. It is completely
* legal to declare a package and leave it uninitialized
* 2) Not an internal object - can be a namespace node instead
* 3) Any type other than a package. Packages are handled in else
* case below.
*/
if ((!this_source_obj) ||
(ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
ACPI_DESC_TYPE_OPERAND)
|| (ACPI_GET_OBJECT_TYPE(this_source_obj) !=
ACPI_TYPE_PACKAGE)) {
status =
walk_callback(ACPI_COPY_TYPE_SIMPLE,
this_source_obj, state, context);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
state->pkg.index++;
while (state->pkg.index >=
state->pkg.source_object->package.count) {
/*
* We've handled all of the objects at this level, This means
* that we have just completed a package. That package may
* have contained one or more packages itself.
*
* Delete this state and pop the previous state (package).
*/
acpi_ut_delete_generic_state(state);
state = acpi_ut_pop_generic_state(&state_list);
/* Finished when there are no more states */
if (!state) {
/*
* We have handled all of the objects in the top level
* package just add the length of the package objects
* and exit
*/
return_ACPI_STATUS(AE_OK);
}
/*
* Go back up a level and move the index past the just
* completed package object.
*/
state->pkg.index++;
}
} else {
/* This is a subobject of type package */
status =
walk_callback(ACPI_COPY_TYPE_PACKAGE,
this_source_obj, state, context);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Push the current state and create a new one
* The callback above returned a new target package object.
*/
acpi_ut_push_generic_state(&state_list, state);
state = acpi_ut_create_pkg_state(this_source_obj,
state->pkg.
this_target_obj, 0);
if (!state) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
}
}
/* We should never get here */
return_ACPI_STATUS(AE_AML_INTERNAL);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_generate_checksum
*
* PARAMETERS: Buffer - Buffer to be scanned
* Length - number of bytes to examine
*
* RETURN: The generated checksum
*
* DESCRIPTION: Generate a checksum on a raw buffer
*
******************************************************************************/
u8 acpi_ut_generate_checksum(u8 * buffer, u32 length)
{
u32 i;
signed char sum = 0;
for (i = 0; i < length; i++) {
sum = (signed char)(sum + buffer[i]);
}
return ((u8) (0 - sum));
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_report_error
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
*
* RETURN: None
*
* DESCRIPTION: Print error message
*
******************************************************************************/
void acpi_ut_report_error(char *module_name, u32 line_number, u32 component_id)
{
acpi_os_printf("%8s-%04d: *** Error: ", module_name, line_number);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_report_warning
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
*
* RETURN: None
*
* DESCRIPTION: Print warning message
*
******************************************************************************/
void
acpi_ut_report_warning(char *module_name, u32 line_number, u32 component_id)
{
acpi_os_printf("%8s-%04d: *** Warning: ", module_name, line_number);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_report_info
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* component_id - Caller's component ID (for error output)
*
* RETURN: None
*
* DESCRIPTION: Print information message
*
******************************************************************************/
void acpi_ut_report_info(char *module_name, u32 line_number, u32 component_id)
{
acpi_os_printf("%8s-%04d: *** Info: ", module_name, line_number);
}