acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
{
union acpi_operand_object *string_desc;
union acpi_operand_object *return_desc;
struct acpi_interface_info *interface_info;
acpi_interface_handler interface_handler;
u32 return_value;
ACPI_FUNCTION_TRACE(ut_osi_implementation);
string_desc = walk_state->arguments[0].object;
if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
return_ACPI_STATUS(AE_TYPE);
}
return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!return_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
return_value = 0;
(void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
interface_info = acpi_ut_get_interface(string_desc->string.pointer);
if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
if (interface_info->value > acpi_gbl_osi_data) {
acpi_gbl_osi_data = interface_info->value;
}
return_value = ACPI_UINT32_MAX;
}
acpi_os_release_mutex(acpi_gbl_osi_mutex);
interface_handler = acpi_gbl_interface_handler;
if (interface_handler) {
return_value =
interface_handler(string_desc->string.pointer,
return_value);
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
"ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
string_desc->string.pointer,
return_value == 0 ? "not " : ""));
return_desc->integer.value = return_value;
walk_state->return_desc = return_desc;
return_ACPI_STATUS(AE_OK);
}
acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
{
union acpi_operand_object *string_desc;
union acpi_operand_object *return_desc;
struct acpi_interface_info *interface_info;
acpi_interface_handler interface_handler;
acpi_status status;
u32 return_value;
ACPI_FUNCTION_TRACE(ut_osi_implementation);
/* Validate the string input argument (from the AML caller) */
string_desc = walk_state->arguments[0].object;
if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
return_ACPI_STATUS(AE_TYPE);
}
/* Create a return object */
return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!return_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Default return value is 0, NOT SUPPORTED */
return_value = 0;
status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(return_desc);
return_ACPI_STATUS(status);
}
/* Lookup the interface in the global _OSI list */
interface_info = acpi_ut_get_interface(string_desc->string.pointer);
if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
/*
* The interface is supported.
* Update the osi_data if necessary. We keep track of the latest
* version of Windows that has been requested by the BIOS.
*/
if (interface_info->value > acpi_gbl_osi_data) {
acpi_gbl_osi_data = interface_info->value;
}
return_value = ACPI_UINT32_MAX;
}
acpi_os_release_mutex(acpi_gbl_osi_mutex);
/*
* Invoke an optional _OSI interface handler. The host OS may wish
* to do some interface-specific handling. For example, warn about
* certain interfaces or override the true/false support value.
*/
interface_handler = acpi_gbl_interface_handler;
if (interface_handler) {
return_value =
interface_handler(string_desc->string.pointer,
return_value);
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
"ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
string_desc->string.pointer,
return_value == 0 ? "not " : ""));
/* Complete the return object */
return_desc->integer.value = return_value;
walk_state->return_desc = return_desc;
return_ACPI_STATUS(AE_OK);
}
