/*******************************************************************************
*
* FUNCTION: acpi_rs_convert_aml_to_resources
*
* PARAMETERS: Aml - Pointer to the resource byte stream
* aml_length - Length of Aml
* output_buffer - Pointer to the buffer that will
* contain the output structures
*
* RETURN: Status
*
* DESCRIPTION: Takes the resource byte stream and parses it, creating a
* linked list of resources in the caller's output buffer
*
******************************************************************************/
acpi_status
acpi_rs_convert_aml_to_resources(u8 * aml, u32 aml_length, u8 * output_buffer)
{
struct acpi_resource *resource = (void *)output_buffer;
acpi_status status;
u8 resource_index;
u8 *end_aml;
ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources");
end_aml = aml + aml_length;
/* Loop until end-of-buffer or an end_tag is found */
while (aml < end_aml) {
/* Validate the Resource Type and Resource Length */
status = acpi_ut_validate_resource(aml, &resource_index);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Convert the AML byte stream resource to a local resource struct */
status =
acpi_rs_convert_aml_to_resource(resource,
ACPI_CAST_PTR(union
aml_resource,
aml),
acpi_gbl_get_resource_dispatch
[resource_index]);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not convert AML resource (Type %X)",
*aml));
return_ACPI_STATUS(status);
}
/* Normal exit on completion of an end_tag resource descriptor */
if (acpi_ut_get_resource_type(aml) ==
ACPI_RESOURCE_NAME_END_TAG) {
return_ACPI_STATUS(AE_OK);
}
/* Point to the next input AML resource */
aml += acpi_ut_get_descriptor_length(aml);
/* Point to the next structure in the output buffer */
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);
}
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;
ACPI_FUNCTION_TRACE(rs_get_list_length);
*size_needed = 0;
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(aml_buffer, &resource_index);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* 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;
break;
case ACPI_RESOURCE_NAME_END_TAG:
/*
* End Tag:
* This is the normal exit, add size of end_tag
*/
*size_needed += ACPI_RS_SIZE_MIN;
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;
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.
*/
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);
}
