// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name : rscalc - Calculate stream and list lengths
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acresrc.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rscalc" )
/* Local prototypes */
static u8 acpi_rs_count_set_bits(u16 bit_field);
static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
static u32
acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
/*******************************************************************************
*
* FUNCTION : acpi_rs_count_set_bits
*
* PARAMETERS : bit_field - Field in which to count bits
*
* RETURN : Number of bits set within the field
*
* DESCRIPTION : Count the number of bits set in a resource field . Used for
* ( Short descriptor ) interrupt and DMA lists .
*
******************************************************************************/
static u8 acpi_rs_count_set_bits(u16 bit_field)
{
u8 bits_set;
ACPI_FUNCTION_ENTRY();
for (bits_set = 0 ; bit_field; bits_set++) {
/* Zero the least significant bit that is set */
bit_field &= (u16) (bit_field - 1 );
}
return (bits_set);
}
/*******************************************************************************
*
* FUNCTION : acpi_rs_struct_option_length
*
* PARAMETERS : resource_source - Pointer to optional descriptor field
*
* RETURN : Status
*
* DESCRIPTION : Common code to handle optional resource_source_index and
* resource_source fields in some Large descriptors . Used during
* list - to - stream conversion
*
******************************************************************************/
static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
{
ACPI_FUNCTION_ENTRY();
/*
* If the resource_source string is valid , return the size of the string
* ( string_length includes the NULL terminator ) plus the size of the
* resource_source_index ( 1 ) .
*/
if (resource_source->string_ptr) {
return ((acpi_rs_length)(resource_source->string_length + 1 ));
}
return (0 );
}
/*******************************************************************************
*
* FUNCTION : acpi_rs_stream_option_length
*
* PARAMETERS : resource_length - Length from the resource header
* minimum_total_length - Minimum length of this resource , before
* any optional fields . Includes header size
*
* RETURN : Length of optional string ( 0 if no string present )
*
* DESCRIPTION : Common code to handle optional resource_source_index and
* resource_source fields in some Large descriptors . Used during
* stream - to - list conversion
*
******************************************************************************/
static u32
acpi_rs_stream_option_length(u32 resource_length,
u32 minimum_aml_resource_length)
{
u32 string_length = 0 ;
ACPI_FUNCTION_ENTRY();
/*
* The resource_source_index and resource_source are optional elements of
* some Large - type resource descriptors .
*/
/*
* If the length of the actual resource descriptor is greater than the
* ACPI spec - defined minimum length , it means that a resource_source_index
* exists and is followed by a ( required ) null terminated string . The
* string length ( including the null terminator ) is the resource length
* minus the minimum length , minus one byte for the resource_source_index
* itself .
*/
if (resource_length > minimum_aml_resource_length) {
/* Compute the length of the optional string */
string_length =
resource_length - minimum_aml_resource_length - 1 ;
}
/*
* Round the length up to a multiple of the native word in order to
* guarantee that the entire resource descriptor is native word aligned
*/
return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
}
/*******************************************************************************
*
* FUNCTION : acpi_rs_get_aml_length
*
* PARAMETERS : resource - Pointer to the resource linked list
* resource_list_size - Size of the resource linked list
* size_needed - Where the required size is returned
*
* RETURN : Status
*
* DESCRIPTION : Takes a linked list of internal resource descriptors and
* calculates the size buffer needed to hold the corresponding
* external resource byte stream .
*
******************************************************************************/
acpi_status
acpi_rs_get_aml_length(struct acpi_resource *resource,
acpi_size resource_list_size, acpi_size *size_needed)
{
acpi_size aml_size_needed = 0 ;
struct acpi_resource *resource_end;
acpi_rs_length total_size;
ACPI_FUNCTION_TRACE(rs_get_aml_length);
/* Traverse entire list of internal resource descriptors */
resource_end =
ACPI_ADD_PTR(struct acpi_resource, resource, resource_list_size);
while (resource < resource_end) {
/* Validate the descriptor type */
if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
}
/* Sanity check the length. It must not be zero, or we loop forever */
if (!resource->length) {
return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
}
/* Get the base size of the (external stream) resource descriptor */
total_size = acpi_gbl_aml_resource_sizes[resource->type];
/*
* Augment the base size for descriptors with optional and / or
* variable - length fields
*/
switch (resource->type) {
case ACPI_RESOURCE_TYPE_IRQ:
/* Length can be 3 or 2 */
if (resource->data.irq.descriptor_length == 2 ) {
total_size--;
}
break ;
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
/* Length can be 1 or 0 */
if (resource->data.irq.descriptor_length == 0 ) {
total_size--;
}
break ;
case ACPI_RESOURCE_TYPE_VENDOR:
/*
* Vendor Defined Resource :
* For a Vendor Specific resource , if the Length is between 1 and 7
* it will be created as a Small Resource data type , otherwise it
* is a Large Resource data type .
*/
if (resource->data.vendor.byte_length > 7 ) {
/* Base size of a Large resource descriptor */
total_size =
sizeof (struct aml_resource_large_header);
}
/* Add the size of the vendor-specific data */
total_size = (acpi_rs_length)
(total_size + resource->data.vendor.byte_length);
break ;
case ACPI_RESOURCE_TYPE_END_TAG:
/*
* End Tag :
* We are done - - return the accumulated total size .
*/
*size_needed = aml_size_needed + total_size;
/* Normal exit */
return_ACPI_STATUS(AE_OK);
case ACPI_RESOURCE_TYPE_ADDRESS16:
/*
* 16 - Bit Address Resource :
* Add the size of the optional resource_source info
*/
total_size = (acpi_rs_length)(total_size +
acpi_rs_struct_option_length
(&resource->data.
address16.
resource_source));
break ;
case ACPI_RESOURCE_TYPE_ADDRESS32:
/*
* 32 - Bit Address Resource :
* Add the size of the optional resource_source info
*/
total_size = (acpi_rs_length)(total_size +
acpi_rs_struct_option_length
(&resource->data.
address32.
resource_source));
break ;
case ACPI_RESOURCE_TYPE_ADDRESS64:
/*
* 64 - Bit Address Resource :
* Add the size of the optional resource_source info
*/
total_size = (acpi_rs_length)(total_size +
acpi_rs_struct_option_length
(&resource->data.
address64.
resource_source));
break ;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
/*
* Extended IRQ Resource :
* Add the size of each additional optional interrupt beyond the
* required 1 ( 4 bytes for each u32 interrupt number )
*/
total_size = (acpi_rs_length)(total_size +
((resource->data.
extended_irq.
interrupt_count -
1 ) * 4 ) +
/* Add the size of the optional resource_source info */
acpi_rs_struct_option_length
(&resource->data.
extended_irq.
resource_source));
break ;
case ACPI_RESOURCE_TYPE_GPIO:
total_size = (acpi_rs_length)(total_size +
(resource->data.gpio.
pin_table_length * 2 ) +
resource->data.gpio.
resource_source.
string_length +
resource->data.gpio.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_PIN_FUNCTION:
total_size = (acpi_rs_length)(total_size +
(resource->data.
pin_function.
pin_table_length * 2 ) +
resource->data.
pin_function.
resource_source.
string_length +
resource->data.
pin_function.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_CLOCK_INPUT:
total_size = (acpi_rs_length)(total_size +
resource->data.
clock_input.
resource_source.
string_length);
break ;
case ACPI_RESOURCE_TYPE_SERIAL_BUS:
total_size =
acpi_gbl_aml_resource_serial_bus_sizes[resource->
data.
common_serial_bus.
type];
total_size = (acpi_rs_length)(total_size +
resource->data.
i2c_serial_bus.
resource_source.
string_length +
resource->data.
i2c_serial_bus.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_PIN_CONFIG:
total_size = (acpi_rs_length)(total_size +
(resource->data.
pin_config.
pin_table_length * 2 ) +
resource->data.pin_config.
resource_source.
string_length +
resource->data.pin_config.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_PIN_GROUP:
total_size = (acpi_rs_length)(total_size +
(resource->data.pin_group.
pin_table_length * 2 ) +
resource->data.pin_group.
resource_label.
string_length +
resource->data.pin_group.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_PIN_GROUP_FUNCTION:
total_size = (acpi_rs_length)(total_size +
resource->data.
pin_group_function.
resource_source.
string_length +
resource->data.
pin_group_function.
resource_source_label.
string_length +
resource->data.
pin_group_function.
vendor_length);
break ;
case ACPI_RESOURCE_TYPE_PIN_GROUP_CONFIG:
total_size = (acpi_rs_length)(total_size +
resource->data.
pin_group_config.
resource_source.
string_length +
resource->data.
pin_group_config.
resource_source_label.
string_length +
resource->data.
pin_group_config.
vendor_length);
break ;
default :
break ;
}
/* Update the total */
aml_size_needed += total_size;
/* Point to the next object */
resource =
ACPI_ADD_PTR(struct acpi_resource, resource,
resource->length);
}
/* Did not find an end_tag resource descriptor */
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
/*******************************************************************************
*
* FUNCTION : acpi_rs_get_list_length
*
* PARAMETERS : aml_buffer - Pointer to the resource byte stream
* aml_buffer_length - Size of aml_buffer
* size_needed - Where the size needed is returned
*
* RETURN : Status
*
* DESCRIPTION : Takes an external resource byte stream and calculates the size
* buffer needed to hold the corresponding internal resource
* descriptor linked list .
*
******************************************************************************/
acpi_status
acpi_rs_get_list_length(u8 *aml_buffer,
u32 aml_buffer_length, acpi_size *size_needed)
{
acpi_status status;
u8 *end_aml;
u8 *buffer;
u32 buffer_size;
u16 temp16;
u16 resource_length;
u32 extra_struct_bytes;
u8 resource_index;
u8 minimum_aml_resource_length;
union aml_resource *aml_resource;
ACPI_FUNCTION_TRACE(rs_get_list_length);
*size_needed = ACPI_RS_SIZE_MIN; /* Minimum size is one end_tag */
end_aml = aml_buffer + aml_buffer_length;
/* Walk the list of AML resource descriptors */
while (aml_buffer < end_aml) {
/* Validate the Resource Type and Resource Length */
status =
acpi_ut_validate_resource(NULL, aml_buffer,
&resource_index);
if (ACPI_FAILURE(status)) {
/*
* Exit on failure . Cannot continue because the descriptor length
* may be bogus also .
*/
return_ACPI_STATUS(status);
}
aml_resource = (void *)aml_buffer;
/* Get the resource length and base (minimum) AML size */
resource_length = acpi_ut_get_resource_length(aml_buffer);
minimum_aml_resource_length =
acpi_gbl_resource_aml_sizes[resource_index];
/*
* Augment the size for descriptors with optional
* and / or variable length fields
*/
extra_struct_bytes = 0 ;
buffer =
aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
switch (acpi_ut_get_resource_type(aml_buffer)) {
case ACPI_RESOURCE_NAME_IRQ:
/*
* IRQ Resource :
* Get the number of bits set in the 16 - bit IRQ mask
*/
ACPI_MOVE_16_TO_16(&temp16, buffer);
extra_struct_bytes = acpi_rs_count_set_bits(temp16);
break ;
case ACPI_RESOURCE_NAME_DMA:
/*
* DMA Resource :
* Get the number of bits set in the 8 - bit DMA mask
*/
extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
break ;
case ACPI_RESOURCE_NAME_VENDOR_SMALL:
case ACPI_RESOURCE_NAME_VENDOR_LARGE:
/*
* Vendor Resource :
* Get the number of vendor data bytes
*/
extra_struct_bytes = resource_length;
/*
* There is already one byte included in the minimum
* descriptor size . If there are extra struct bytes ,
* subtract one from the count .
*/
if (extra_struct_bytes) {
extra_struct_bytes--;
}
break ;
case ACPI_RESOURCE_NAME_END_TAG:
/*
* End Tag : This is the normal exit
*/
return_ACPI_STATUS(AE_OK);
case ACPI_RESOURCE_NAME_ADDRESS32:
case ACPI_RESOURCE_NAME_ADDRESS16:
case ACPI_RESOURCE_NAME_ADDRESS64:
/*
* Address Resource :
* Add the size of the optional resource_source
*/
extra_struct_bytes =
acpi_rs_stream_option_length(resource_length,
minimum_aml_resource_length);
break ;
case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
/*
* Extended IRQ Resource :
* Using the interrupt_table_length , add 4 bytes for each additional
* interrupt . Note : at least one interrupt is required and is
* included in the minimum descriptor size ( reason for the - 1 )
*/
extra_struct_bytes = (buffer[1 ] - 1 ) * sizeof (u32);
/* Add the size of the optional resource_source */
extra_struct_bytes +=
acpi_rs_stream_option_length(resource_length -
extra_struct_bytes,
minimum_aml_resource_length);
break ;
case ACPI_RESOURCE_NAME_GPIO:
/* Vendor data is optional */
if (aml_resource->gpio.vendor_length) {
extra_struct_bytes +=
aml_resource->gpio.vendor_offset -
aml_resource->gpio.pin_table_offset +
aml_resource->gpio.vendor_length;
} else {
extra_struct_bytes +=
aml_resource->large_header.resource_length +
sizeof (struct aml_resource_large_header) -
aml_resource->gpio.pin_table_offset;
}
break ;
case ACPI_RESOURCE_NAME_PIN_FUNCTION:
/* Vendor data is optional */
if (aml_resource->pin_function.vendor_length) {
extra_struct_bytes +=
aml_resource->pin_function.vendor_offset -
aml_resource->pin_function.
pin_table_offset +
aml_resource->pin_function.vendor_length;
} else {
extra_struct_bytes +=
aml_resource->large_header.resource_length +
sizeof (struct aml_resource_large_header) -
aml_resource->pin_function.pin_table_offset;
}
break ;
case ACPI_RESOURCE_NAME_SERIAL_BUS:{
minimum_aml_resource_length =
acpi_gbl_resource_aml_serial_bus_sizes
[aml_resource->common_serial_bus.type];
extra_struct_bytes +=
aml_resource->common_serial_bus.
resource_length -
minimum_aml_resource_length;
break ;
}
case ACPI_RESOURCE_NAME_PIN_CONFIG:
/* Vendor data is optional */
if (aml_resource->pin_config.vendor_length) {
extra_struct_bytes +=
aml_resource->pin_config.vendor_offset -
aml_resource->pin_config.pin_table_offset +
aml_resource->pin_config.vendor_length;
} else {
extra_struct_bytes +=
aml_resource->large_header.resource_length +
sizeof (struct aml_resource_large_header) -
aml_resource->pin_config.pin_table_offset;
}
break ;
case ACPI_RESOURCE_NAME_PIN_GROUP:
extra_struct_bytes +=
aml_resource->pin_group.vendor_offset -
aml_resource->pin_group.pin_table_offset +
aml_resource->pin_group.vendor_length;
break ;
case ACPI_RESOURCE_NAME_PIN_GROUP_FUNCTION:
extra_struct_bytes +=
aml_resource->pin_group_function.vendor_offset -
aml_resource->pin_group_function.res_source_offset +
aml_resource->pin_group_function.vendor_length;
break ;
case ACPI_RESOURCE_NAME_PIN_GROUP_CONFIG:
extra_struct_bytes +=
aml_resource->pin_group_config.vendor_offset -
aml_resource->pin_group_config.res_source_offset +
aml_resource->pin_group_config.vendor_length;
break ;
case ACPI_RESOURCE_NAME_CLOCK_INPUT:
extra_struct_bytes =
acpi_rs_stream_option_length(resource_length,
minimum_aml_resource_length);
break ;
default :
break ;
}
/*
* Update the required buffer size for the internal descriptor structs
*
* Important : Round the size up for the appropriate alignment . This
* is a requirement on IA64 .
*/
if (acpi_ut_get_resource_type(aml_buffer) ==
ACPI_RESOURCE_NAME_SERIAL_BUS) {
buffer_size =
acpi_gbl_resource_struct_serial_bus_sizes
[aml_resource->common_serial_bus.type] +
extra_struct_bytes;
} else {
buffer_size =
acpi_gbl_resource_struct_sizes[resource_index] +
extra_struct_bytes;
}
buffer_size = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
*size_needed += buffer_size;
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
"Type %.2X, AmlLength %.2X InternalLength %.2X%8X\n" ,
acpi_ut_get_resource_type(aml_buffer),
acpi_ut_get_descriptor_length(aml_buffer),
ACPI_FORMAT_UINT64(*size_needed)));
/*
* Point to the next resource within the AML stream using the length
* contained in the resource descriptor header
*/
aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
}
/* Did not find an end_tag resource descriptor */
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
/*******************************************************************************
*
* FUNCTION : acpi_rs_get_pci_routing_table_length
*
* PARAMETERS : package_object - Pointer to the package object
* buffer_size_needed - u32 pointer of the size buffer
* needed to properly return the
* parsed data
*
* RETURN : Status
*
* DESCRIPTION : Given a package representing a PCI routing table , this
* calculates the size of the corresponding linked list of
* descriptions .
*
******************************************************************************/
acpi_status
acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
acpi_size *buffer_size_needed)
{
u32 number_of_elements;
acpi_size temp_size_needed = 0 ;
union acpi_operand_object **top_object_list;
u32 index;
union acpi_operand_object *package_element;
union acpi_operand_object **sub_object_list;
u8 name_found;
u32 table_index;
ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
number_of_elements = package_object->package.count;
/*
* Calculate the size of the return buffer .
* The base size is the number of elements * the sizes of the
* structures . Additional space for the strings is added below .
* The minus one is to subtract the size of the u8 Source [ 1 ]
* member because it is added below .
*
* But each PRT_ENTRY structure has a pointer to a string and
* the size of that string must be found .
*/
top_object_list = package_object->package.elements;
for (index = 0 ; index < number_of_elements; index++) {
/* Dereference the subpackage */
package_element = *top_object_list;
/* We must have a valid Package object */
if (!package_element ||
(package_element->common.type != ACPI_TYPE_PACKAGE)) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/*
* The sub_object_list will now point to an array of the
* four IRQ elements : Address , Pin , Source and source_index
*/
sub_object_list = package_element->package.elements;
/* Scan the irq_table_elements for the Source Name String */
name_found = FALSE ;
for (table_index = 0 ;
table_index < package_element->package.count
&& !name_found; table_index++) {
if (*sub_object_list && /* Null object allowed */
((ACPI_TYPE_STRING ==
(*sub_object_list)->common.type) ||
((ACPI_TYPE_LOCAL_REFERENCE ==
(*sub_object_list)->common.type) &&
((*sub_object_list)->reference.class ==
ACPI_REFCLASS_NAME)))) {
name_found = TRUE ;
} else {
/* Look at the next element */
sub_object_list++;
}
}
temp_size_needed += (sizeof (struct acpi_pci_routing_table) - 4 );
/* Was a String type found? */
if (name_found) {
if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
/*
* The length String . Length field does not include the
* terminating NULL , add 1
*/
temp_size_needed += ((acpi_size)
(*sub_object_list)->string.
length + 1 );
} else {
temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
}
} else {
/*
* If no name was found , then this is a NULL , which is
* translated as a u32 zero .
*/
temp_size_needed += sizeof (u32);
}
/* Round up the size since each element must be aligned */
temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
/* Point to the next union acpi_operand_object */
top_object_list++;
}
/*
* Add an extra element to the end of the list , essentially a
* NULL terminator
*/
*buffer_size_needed =
temp_size_needed + sizeof (struct acpi_pci_routing_table);
return_ACPI_STATUS(AE_OK);
}
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