230 lines
6.8 KiB
C
230 lines
6.8 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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*
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* Module Name: rslist - Linked list utilities
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*
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******************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acresrc.h"
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#define _COMPONENT ACPI_RESOURCES
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ACPI_MODULE_NAME("rslist")
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_convert_aml_to_resources
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*
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* PARAMETERS: acpi_walk_aml_callback
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* resource_ptr - Pointer to the buffer that will
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* contain the output structures
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert an AML resource to an internal representation of the
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* resource that is aligned and easier to access.
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*
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******************************************************************************/
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acpi_status
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acpi_rs_convert_aml_to_resources(u8 * aml,
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u32 length,
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u32 offset, u8 resource_index, void **context)
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{
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struct acpi_resource **resource_ptr =
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ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
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struct acpi_resource *resource;
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union aml_resource *aml_resource;
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struct acpi_rsconvert_info *conversion_table;
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acpi_status status;
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ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
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/*
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* Check that the input buffer and all subsequent pointers into it
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* are aligned on a native word boundary. Most important on IA64
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*/
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resource = *resource_ptr;
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if (ACPI_IS_MISALIGNED(resource)) {
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ACPI_WARNING((AE_INFO,
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"Misaligned resource pointer %p", resource));
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}
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/* Get the appropriate conversion info table */
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aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
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if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {
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if (aml_resource->common_serial_bus.type >
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AML_RESOURCE_MAX_SERIALBUSTYPE) {
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conversion_table = NULL;
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} else {
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/* This is an I2C, SPI, UART, or CSI2 serial_bus descriptor */
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conversion_table =
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acpi_gbl_convert_resource_serial_bus_dispatch
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[aml_resource->common_serial_bus.type];
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}
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} else {
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conversion_table =
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acpi_gbl_get_resource_dispatch[resource_index];
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}
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if (!conversion_table) {
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ACPI_ERROR((AE_INFO,
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"Invalid/unsupported resource descriptor: Type 0x%2.2X",
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resource_index));
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return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
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}
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/* Convert the AML byte stream resource to a local resource struct */
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status =
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acpi_rs_convert_aml_to_resource(resource, aml_resource,
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conversion_table);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not convert AML resource (Type 0x%X)",
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*aml));
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return_ACPI_STATUS(status);
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}
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if (!resource->length) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Zero-length resource returned from RsConvertAmlToResource"));
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}
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ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
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"Type %.2X, AmlLength %.2X InternalLength %.2X\n",
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acpi_ut_get_resource_type(aml), length,
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resource->length));
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/* Point to the next structure in the output buffer */
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*resource_ptr = ACPI_NEXT_RESOURCE(resource);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_convert_resources_to_aml
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*
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* PARAMETERS: resource - Pointer to the resource linked list
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* aml_size_needed - Calculated size of the byte stream
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* needed from calling acpi_rs_get_aml_length()
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* The size of the output_buffer is
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* guaranteed to be >= aml_size_needed
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* output_buffer - Pointer to the buffer that will
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* contain the byte stream
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*
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* RETURN: Status
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*
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* DESCRIPTION: Takes the resource linked list and parses it, creating a
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* byte stream of resources in the caller's output buffer
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*
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******************************************************************************/
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acpi_status
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acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
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acpi_size aml_size_needed, u8 * output_buffer)
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{
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u8 *aml = output_buffer;
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u8 *end_aml = output_buffer + aml_size_needed;
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struct acpi_rsconvert_info *conversion_table;
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acpi_status status;
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ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
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/* Walk the resource descriptor list, convert each descriptor */
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while (aml < end_aml) {
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/* Validate the (internal) Resource Type */
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if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
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ACPI_ERROR((AE_INFO,
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"Invalid descriptor type (0x%X) in resource list",
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resource->type));
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return_ACPI_STATUS(AE_BAD_DATA);
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}
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/* Sanity check the length. It must not be zero, or we loop forever */
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if (!resource->length) {
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ACPI_ERROR((AE_INFO,
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"Invalid zero length descriptor in resource list\n"));
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return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
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}
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/* Perform the conversion */
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if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
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if (resource->data.common_serial_bus.type >
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AML_RESOURCE_MAX_SERIALBUSTYPE) {
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conversion_table = NULL;
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} else {
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/* This is an I2C, SPI, UART or CSI2 serial_bus descriptor */
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conversion_table =
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acpi_gbl_convert_resource_serial_bus_dispatch
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[resource->data.common_serial_bus.type];
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}
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} else {
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conversion_table =
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acpi_gbl_set_resource_dispatch[resource->type];
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}
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if (!conversion_table) {
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ACPI_ERROR((AE_INFO,
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"Invalid/unsupported resource descriptor: Type 0x%2.2X",
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resource->type));
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return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
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}
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status = acpi_rs_convert_resource_to_aml(resource,
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ACPI_CAST_PTR(union
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aml_resource,
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aml),
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conversion_table);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not convert resource (type 0x%X) to AML",
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resource->type));
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return_ACPI_STATUS(status);
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}
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/* Perform final sanity check on the new AML resource descriptor */
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status =
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acpi_ut_validate_resource(NULL,
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ACPI_CAST_PTR(union aml_resource,
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aml), NULL);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Check for end-of-list, normal exit */
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if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
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/* An End Tag indicates the end of the input Resource Template */
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Extract the total length of the new descriptor and set the
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* Aml to point to the next (output) resource descriptor
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*/
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aml += acpi_ut_get_descriptor_length(aml);
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/* Point to the next input resource descriptor */
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resource = ACPI_NEXT_RESOURCE(resource);
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}
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/* Completed buffer, but did not find an end_tag resource descriptor */
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return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
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}
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