Commit 0e243178 authored by Bob Moore's avatar Bob Moore Committed by Len Brown

ACPI 5.0: New interface, acpi_buffer_to_resource

This interface converts an AML buffer to an internal ACPI_RESOURCE.
Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a91cdde2
......@@ -49,6 +49,70 @@
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rscreate")
/*******************************************************************************
*
* FUNCTION: acpi_buffer_to_resource
*
* PARAMETERS: aml_buffer - Pointer to the resource byte stream
* aml_buffer_length - Length of the aml_buffer
* resource_ptr - Where the converted resource is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert a raw AML buffer to a resource list
*
******************************************************************************/
acpi_status
acpi_buffer_to_resource(u8 *aml_buffer,
u16 aml_buffer_length,
struct acpi_resource **resource_ptr)
{
acpi_status status;
acpi_size list_size_needed;
void *resource;
void *current_resource_ptr;
/*
* Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
* is not required here.
*/
/* Get the required length for the converted resource */
status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
&list_size_needed);
if (status == AE_AML_NO_RESOURCE_END_TAG) {
status = AE_OK;
}
if (ACPI_FAILURE(status)) {
return (status);
}
/* Allocate a buffer for the converted resource */
resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
current_resource_ptr = resource;
if (!resource) {
return (AE_NO_MEMORY);
}
/* Perform the AML-to-Resource conversion */
status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length,
acpi_rs_convert_aml_to_resources,
&current_resource_ptr);
if (status == AE_AML_NO_RESOURCE_END_TAG) {
status = AE_OK;
}
if (ACPI_FAILURE(status)) {
ACPI_FREE(resource);
} else {
*resource_ptr = resource;
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_create_resource_list
......
......@@ -376,6 +376,11 @@ acpi_status
acpi_resource_to_address64(struct acpi_resource *resource,
struct acpi_resource_address64 *out);
acpi_status
acpi_buffer_to_resource(u8 *aml_buffer,
u16 aml_buffer_length,
struct acpi_resource **resource_ptr);
/*
* Hardware (ACPI device) interfaces
*/
......
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