825 lines
22 KiB
C
825 lines
22 KiB
C
// 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_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;
|
|
|
|
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\n",
|
|
acpi_ut_get_resource_type(aml_buffer),
|
|
acpi_ut_get_descriptor_length(aml_buffer),
|
|
buffer_size));
|
|
|
|
/*
|
|
* 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);
|
|
}
|