acpi_table_find
if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_SPCR, (void **)&spcr))) {
if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_FADT, (void **)&fadt))) {
if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_MADT, (void **)&madt))) {
rv = acpi_table_find(ACPI_SIG_SPCR, (void **)&spcr);
ACPI_STATUS acpi_table_find(const char *, void **);