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linux/drivers/acpi/acpica/rsutils.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: rsutils - Utilities for the resource manager
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acresrc.h"
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rsutils")
/*******************************************************************************
*
* FUNCTION: acpi_rs_decode_bitmask
*
* PARAMETERS: mask - Bitmask to decode
* list - Where the converted list is returned
*
* RETURN: Count of bits set (length of list)
*
* DESCRIPTION: Convert a bit mask into a list of values
*
******************************************************************************/
u8 acpi_rs_decode_bitmask(u16 mask, u8 * list)
{
u8 i;
u8 bit_count;
ACPI_FUNCTION_ENTRY();
/* Decode the mask bits */
for (i = 0, bit_count = 0; mask; i++) {
if (mask & 0x0001) {
list[bit_count] = i;
bit_count++;
}
mask >>= 1;
}
return (bit_count);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_encode_bitmask
*
* PARAMETERS: list - List of values to encode
* count - Length of list
*
* RETURN: Encoded bitmask
*
* DESCRIPTION: Convert a list of values to an encoded bitmask
*
******************************************************************************/
u16 acpi_rs_encode_bitmask(u8 * list, u8 count)
{
u32 i;
u16 mask;
ACPI_FUNCTION_ENTRY();
/* Encode the list into a single bitmask */
for (i = 0, mask = 0; i < count; i++) {
mask |= (0x1 << list[i]);
}
return (mask);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_move_data
*
* PARAMETERS: destination - Pointer to the destination descriptor
* source - Pointer to the source descriptor
* item_count - How many items to move
* move_type - Byte width
*
* RETURN: None
*
* DESCRIPTION: Move multiple data items from one descriptor to another. Handles
* alignment issues and endian issues if necessary, as configured
* via the ACPI_MOVE_* macros. (This is why a memcpy is not used)
*
******************************************************************************/
void
acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type)
{
u32 i;
ACPI_FUNCTION_ENTRY();
/* One move per item */
for (i = 0; i < item_count; i++) {
switch (move_type) {
/*
* For the 8-bit case, we can perform the move all at once
* since there are no alignment or endian issues
*/
case ACPI_RSC_MOVE8:
case ACPI_RSC_MOVE_GPIO_RES:
case ACPI_RSC_MOVE_SERIAL_VEN:
case ACPI_RSC_MOVE_SERIAL_RES:
memcpy(destination, source, item_count);
return;
/*
* 16-, 32-, and 64-bit cases must use the move macros that perform
* endian conversion and/or accommodate hardware that cannot perform
* misaligned memory transfers
*/
case ACPI_RSC_MOVE16:
case ACPI_RSC_MOVE_GPIO_PIN:
ACPI_MOVE_16_TO_16(&ACPI_CAST_PTR(u16, destination)[i],
&ACPI_CAST_PTR(u16, source)[i]);
break;
case ACPI_RSC_MOVE32:
ACPI_MOVE_32_TO_32(&ACPI_CAST_PTR(u32, destination)[i],
&ACPI_CAST_PTR(u32, source)[i]);
break;
case ACPI_RSC_MOVE64:
ACPI_MOVE_64_TO_64(&ACPI_CAST_PTR(u64, destination)[i],
&ACPI_CAST_PTR(u64, source)[i]);
break;
default:
return;
}
}
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_length
*
* PARAMETERS: total_length - Length of the AML descriptor, including
* the header and length fields.
* aml - Pointer to the raw AML descriptor
*
* RETURN: None
*
* DESCRIPTION: Set the resource_length field of an AML
* resource descriptor, both Large and Small descriptors are
* supported automatically. Note: Descriptor Type field must
* be valid.
*
******************************************************************************/
void
acpi_rs_set_resource_length(acpi_rsdesc_size total_length,
union aml_resource *aml)
{
acpi_rs_length resource_length;
ACPI_FUNCTION_ENTRY();
/* Length is the total descriptor length minus the header length */
resource_length = (acpi_rs_length)
(total_length - acpi_ut_get_resource_header_length(aml));
/* Length is stored differently for large and small descriptors */
if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) {
/* Large descriptor -- bytes 1-2 contain the 16-bit length */
ACPI_MOVE_16_TO_16(&aml->large_header.resource_length,
&resource_length);
} else {
/*
* Small descriptor -- bits 2:0 of byte 0 contain the length
* Clear any existing length, preserving descriptor type bits
*/
aml->small_header.descriptor_type = (u8)
((aml->small_header.descriptor_type &
~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK)
| resource_length);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_header
*
* PARAMETERS: descriptor_type - Byte to be inserted as the type
* total_length - Length of the AML descriptor, including
* the header and length fields.
* aml - Pointer to the raw AML descriptor
*
* RETURN: None
*
* DESCRIPTION: Set the descriptor_type and resource_length fields of an AML
* resource descriptor, both Large and Small descriptors are
* supported automatically
*
******************************************************************************/
void
acpi_rs_set_resource_header(u8 descriptor_type,
acpi_rsdesc_size total_length,
union aml_resource *aml)
{
ACPI_FUNCTION_ENTRY();
/* Set the Resource Type */
aml->small_header.descriptor_type = descriptor_type;
/* Set the Resource Length */
acpi_rs_set_resource_length(total_length, aml);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_strcpy
*
* PARAMETERS: destination - Pointer to the destination string
* source - Pointer to the source string
*
* RETURN: String length, including NULL terminator
*
* DESCRIPTION: Local string copy that returns the string length, saving a
* strcpy followed by a strlen.
*
******************************************************************************/
static u16 acpi_rs_strcpy(char *destination, char *source)
{
u16 i;
ACPI_FUNCTION_ENTRY();
for (i = 0; source[i]; i++) {
destination[i] = source[i];
}
destination[i] = 0;
/* Return string length including the NULL terminator */
return ((u16) (i + 1));
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_resource_source
*
* PARAMETERS: resource_length - Length field of the descriptor
* minimum_length - Minimum length of the descriptor (minus
* any optional fields)
* resource_source - Where the resource_source is returned
* aml - Pointer to the raw AML descriptor
* string_ptr - (optional) where to store the actual
* resource_source string
*
* RETURN: Length of the string plus NULL terminator, rounded up to native
* word boundary
*
* DESCRIPTION: Copy the optional resource_source data from a raw AML descriptor
* to an internal resource descriptor
*
******************************************************************************/
acpi_rs_length
acpi_rs_get_resource_source(acpi_rs_length resource_length,
acpi_rs_length minimum_length,
struct acpi_resource_source * resource_source,
union aml_resource * aml, char *string_ptr)
{
acpi_rsdesc_size total_length;
u8 *aml_resource_source;
ACPI_FUNCTION_ENTRY();
total_length =
resource_length + sizeof(struct aml_resource_large_header);
aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);
/*
* resource_source is present if the length of the descriptor is longer
* than the minimum length.
*
* Note: Some resource descriptors will have an additional null, so
* we add 1 to the minimum length.
*/
if (total_length > (acpi_rsdesc_size)(minimum_length + 1)) {
/* Get the resource_source_index */
resource_source->index = aml_resource_source[0];
resource_source->string_ptr = string_ptr;
if (!string_ptr) {
/*
* String destination pointer is not specified; Set the String
* pointer to the end of the current resource_source structure.
*/
resource_source->string_ptr =
ACPI_ADD_PTR(char, resource_source,
sizeof(struct acpi_resource_source));
}
/*
* In order for the Resource length to be a multiple of the native
* word, calculate the length of the string (+1 for NULL terminator)
* and expand to the next word multiple.
*
* Zero the entire area of the buffer.
*/
total_length =
(u32)strlen(ACPI_CAST_PTR(char, &aml_resource_source[1])) +
1;
total_length = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(total_length);
memset(resource_source->string_ptr, 0, total_length);
/* Copy the resource_source string to the destination */
resource_source->string_length =
acpi_rs_strcpy(resource_source->string_ptr,
ACPI_CAST_PTR(char,
&aml_resource_source[1]));
return ((acpi_rs_length)total_length);
}
/* resource_source is not present */
resource_source->index = 0;
resource_source->string_length = 0;
resource_source->string_ptr = NULL;
return (0);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_source
*
* PARAMETERS: aml - Pointer to the raw AML descriptor
* minimum_length - Minimum length of the descriptor (minus
* any optional fields)
* resource_source - Internal resource_source
*
* RETURN: Total length of the AML descriptor
*
* DESCRIPTION: Convert an optional resource_source from internal format to a
* raw AML resource descriptor
*
******************************************************************************/
acpi_rsdesc_size
acpi_rs_set_resource_source(union aml_resource *aml,
acpi_rs_length minimum_length,
struct acpi_resource_source *resource_source)
{
u8 *aml_resource_source;
acpi_rsdesc_size descriptor_length;
ACPI_FUNCTION_ENTRY();
descriptor_length = minimum_length;
/* Non-zero string length indicates presence of a resource_source */
if (resource_source->string_length) {
/* Point to the end of the AML descriptor */
aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);
/* Copy the resource_source_index */
aml_resource_source[0] = (u8) resource_source->index;
/* Copy the resource_source string */
strcpy(ACPI_CAST_PTR(char, &aml_resource_source[1]),
resource_source->string_ptr);
/*
* Add the length of the string (+ 1 for null terminator) to the
* final descriptor length
*/
descriptor_length += ((acpi_rsdesc_size)
resource_source->string_length + 1);
}
/* Return the new total length of the AML descriptor */
return (descriptor_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_prt_method_data
*
* PARAMETERS: node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _PRT value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_prt_method_data(struct acpi_namespace_node *node,
struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(rs_get_prt_method_data);
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(node, METHOD_NAME__PRT, ACPI_BTYPE_PACKAGE,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Create a resource linked list from the byte stream buffer that comes
* back from the _CRS method execution.
*/
status = acpi_rs_create_pci_routing_table(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_crs_method_data
*
* PARAMETERS: node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _CRS value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(rs_get_crs_method_data);
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(node, METHOD_NAME__CRS, ACPI_BTYPE_BUFFER,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the _CRS method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluateObject */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_prs_method_data
*
* PARAMETERS: node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _PRS value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(rs_get_prs_method_data);
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(node, METHOD_NAME__PRS, ACPI_BTYPE_BUFFER,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the _CRS method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluateObject */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_aei_method_data
*
* PARAMETERS: node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _AEI value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_aei_method_data(struct acpi_namespace_node *node,
struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(rs_get_aei_method_data);
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(node, METHOD_NAME__AEI, ACPI_BTYPE_BUFFER,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the _CRS method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluateObject */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_method_data
*
* PARAMETERS: handle - Handle to the containing object
* path - Path to method, relative to Handle
* ret_buffer - Pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _CRS or _PRS value of an
* object contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_method_data(acpi_handle handle,
const char *path, struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(rs_get_method_data);
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(ACPI_CAST_PTR
(struct acpi_namespace_node, handle), path,
ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_srs_method_data
*
* PARAMETERS: node - Device node
* in_buffer - Pointer to a buffer structure of the
* parameter
*
* RETURN: Status
*
* DESCRIPTION: This function is called to set the _SRS of an object contained
* in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
* Note: Parameters guaranteed valid by caller
*
******************************************************************************/
acpi_status
acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
struct acpi_buffer *in_buffer)
{
struct acpi_evaluate_info *info;
union acpi_operand_object *args[2];
acpi_status status;
struct acpi_buffer buffer;
ACPI_FUNCTION_TRACE(rs_set_srs_method_data);
/* Allocate and initialize the evaluation information block */
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
if (!info) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
info->prefix_node = node;
info->relative_pathname = METHOD_NAME__SRS;
info->parameters = args;
info->flags = ACPI_IGNORE_RETURN_VALUE;
/*
* The in_buffer parameter will point to a linked list of
* resource parameters. It needs to be formatted into a
* byte stream to be sent in as an input parameter to _SRS
*
* Convert the linked list into a byte stream
*/
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_rs_create_aml_resources(in_buffer, &buffer);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* Create and initialize the method parameter object */
args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
if (!args[0]) {
/*
* Must free the buffer allocated above (otherwise it is freed
* later)
*/
ACPI_FREE(buffer.pointer);
status = AE_NO_MEMORY;
goto cleanup;
}
args[0]->buffer.length = (u32) buffer.length;
args[0]->buffer.pointer = buffer.pointer;
args[0]->common.flags = AOPOBJ_DATA_VALID;
args[1] = NULL;
/* Execute the method, no return value is expected */
status = acpi_ns_evaluate(info);
/* Clean up and return the status from acpi_ns_evaluate */
acpi_ut_remove_reference(args[0]);
cleanup:
ACPI_FREE(info);
return_ACPI_STATUS(status);
}
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