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ACPI 5.0: New interface, acpi_buffer_to_resource
This interface converts an AML buffer to an internal ACPI_RESOURCE. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -49,6 +49,70 @@
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#define _COMPONENT ACPI_RESOURCES
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ACPI_MODULE_NAME("rscreate")
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/*******************************************************************************
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*
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* FUNCTION: acpi_buffer_to_resource
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*
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* PARAMETERS: aml_buffer - Pointer to the resource byte stream
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* aml_buffer_length - Length of the aml_buffer
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* resource_ptr - Where the converted resource is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert a raw AML buffer to a resource list
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*
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******************************************************************************/
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acpi_status
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acpi_buffer_to_resource(u8 *aml_buffer,
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u16 aml_buffer_length,
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struct acpi_resource **resource_ptr)
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{
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acpi_status status;
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acpi_size list_size_needed;
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void *resource;
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void *current_resource_ptr;
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/*
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* Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
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* is not required here.
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*/
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/* Get the required length for the converted resource */
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status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
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&list_size_needed);
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if (status == AE_AML_NO_RESOURCE_END_TAG) {
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status = AE_OK;
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}
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Allocate a buffer for the converted resource */
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resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
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current_resource_ptr = resource;
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if (!resource) {
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return (AE_NO_MEMORY);
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}
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/* Perform the AML-to-Resource conversion */
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status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length,
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acpi_rs_convert_aml_to_resources,
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¤t_resource_ptr);
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if (status == AE_AML_NO_RESOURCE_END_TAG) {
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status = AE_OK;
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}
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if (ACPI_FAILURE(status)) {
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ACPI_FREE(resource);
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} else {
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*resource_ptr = resource;
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}
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_create_resource_list
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@ -376,6 +376,11 @@ acpi_status
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acpi_resource_to_address64(struct acpi_resource *resource,
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struct acpi_resource_address64 *out);
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acpi_status
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acpi_buffer_to_resource(u8 *aml_buffer,
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u16 aml_buffer_length,
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struct acpi_resource **resource_ptr);
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/*
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* Hardware (ACPI device) interfaces
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*/
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