diff options
Diffstat (limited to 'src/acpi')
| -rw-r--r-- | src/acpi/Kconfig | 6 | ||||
| -rw-r--r-- | src/acpi/acpi.c | 54 |
2 files changed, 60 insertions, 0 deletions
diff --git a/src/acpi/Kconfig b/src/acpi/Kconfig index 293c194538..2727889f9e 100644 --- a/src/acpi/Kconfig +++ b/src/acpi/Kconfig @@ -40,3 +40,9 @@ config HAVE_ACPI_TABLES help This variable specifies whether a given board has ACPI table support. It is usually set in mainboard/*/Kconfig. + +config ACPI_LPIT + bool + depends on HAVE_ACPI_TABLES + help + Selected by platforms that support and fill Intel Low Power Idle Table. diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c index a16800b025..ee30391923 100644 --- a/src/acpi/acpi.c +++ b/src/acpi/acpi.c @@ -1293,6 +1293,44 @@ void acpi_create_fadt(acpi_fadt_t *fadt, acpi_facs_t *facs, void *dsdt) acpi_checksum((void *) fadt, header->length); } +void acpi_create_lpit(acpi_lpit_t *lpit) +{ + acpi_header_t *header = &(lpit->header); + unsigned long current = (unsigned long)lpit + sizeof(acpi_lpit_t); + + memset((void *)lpit, 0, sizeof(acpi_lpit_t)); + + if (!header) + return; + + /* Fill out header fields. */ + memcpy(header->signature, "LPIT", 4); + memcpy(header->oem_id, OEM_ID, 6); + memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8); + memcpy(header->asl_compiler_id, ASLC, 4); + + header->asl_compiler_revision = asl_revision; + header->revision = get_acpi_table_revision(LPIT); + header->oem_revision = 42; + header->length = sizeof(acpi_lpit_t); + + current = acpi_fill_lpit(current); + + /* (Re)calculate length and checksum. */ + header->length = current - (unsigned long)lpit; + header->checksum = acpi_checksum((void *)lpit, header->length); +} + +unsigned long acpi_create_lpi_desc_ncst(acpi_lpi_desc_ncst_t *lpi_desc, uint16_t uid) +{ + memset(lpi_desc, 0, sizeof(acpi_lpi_desc_ncst_t)); + lpi_desc->header.length = sizeof(acpi_lpi_desc_ncst_t); + lpi_desc->header.type = ACPI_LPI_DESC_TYPE_NATIVE_CSTATE; + lpi_desc->header.uid = uid; + + return lpi_desc->header.length; +} + unsigned long __weak fw_cfg_acpi_tables(unsigned long start) { return 0; @@ -1313,6 +1351,7 @@ unsigned long write_acpi_tables(unsigned long start) acpi_tcpa_t *tcpa; acpi_tpm2_t *tpm2; acpi_madt_t *madt; + acpi_lpit_t *lpit; struct device *dev; unsigned long fw; size_t slic_size, dsdt_size; @@ -1507,6 +1546,18 @@ unsigned long write_acpi_tables(unsigned long start) } } + if (CONFIG(ACPI_LPIT)) { + printk(BIOS_DEBUG, "ACPI: * LPIT\n"); + + lpit = (acpi_lpit_t *)current; + acpi_create_lpit(lpit); + if (lpit->header.length >= sizeof(acpi_lpit_t)) { + current += lpit->header.length; + current = acpi_align_current(current); + acpi_add_table(rsdp, lpit); + } + } + printk(BIOS_DEBUG, "ACPI: * MADT\n"); madt = (acpi_madt_t *) current; @@ -1515,6 +1566,7 @@ unsigned long write_acpi_tables(unsigned long start) current += madt->header.length; acpi_add_table(rsdp, madt); } + current = acpi_align_current(current); printk(BIOS_DEBUG, "current = %lx\n", current); @@ -1665,6 +1717,8 @@ int get_acpi_table_revision(enum acpi_tables table) return 1; case CRAT: return 1; + case LPIT: /* ACPI 5.1 up to 6.3: 0 */ + return 0; default: return -1; } |