diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 10 | ||||
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/acpi/Makefile | 6 | ||||
| -rw-r--r-- | lib/acpi/acpi.c | 45 |
4 files changed, 61 insertions, 2 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index d8dac09..c8b3ec1 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -281,9 +281,17 @@ config SUPPORT_ACPI U-Boot can generate these tables and pass them to the Operating System. +config ACPI + bool "Enable support for ACPI libraries" + depends on SUPPORT_ACPI + help + Provides library functions for dealing with ACPI tables. This does + not necessarily include generation of tables + (see GENERATE_ACPI_TABLE), but allows for tables to be located. + config GENERATE_ACPI_TABLE bool "Generate an ACPI (Advanced Configuration and Power Interface) table" - depends on SUPPORT_ACPI + depends on ACPI select QFW if QEMU help The Advanced Configuration and Power Interface (ACPI) specification diff --git a/lib/Makefile b/lib/Makefile index 10aa7ac..8d8ccc8 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -66,7 +66,7 @@ obj-$(CONFIG_$(SPL_TPL_)CRC8) += crc8.o obj-y += crypto/ -obj-$(CONFIG_$(SPL_TPL_)GENERATE_ACPI_TABLE) += acpi/ +obj-$(CONFIG_$(SPL_TPL_)ACPI) += acpi/ obj-$(CONFIG_$(SPL_)MD5) += md5.o obj-$(CONFIG_ECDSA) += ecdsa/ obj-$(CONFIG_$(SPL_)RSA) += rsa/ diff --git a/lib/acpi/Makefile b/lib/acpi/Makefile index 956b5a0..c1c9675 100644 --- a/lib/acpi/Makefile +++ b/lib/acpi/Makefile @@ -1,6 +1,10 @@ # SPDX-License-Identifier: GPL-2.0+ # +obj-y += acpi.o + +ifdef CONFIG_$(SPL_TPL_)GENERATE_ACPI_TABLE + obj-$(CONFIG_$(SPL_)ACPIGEN) += acpigen.o obj-$(CONFIG_$(SPL_)ACPIGEN) += acpi_device.o obj-$(CONFIG_$(SPL_)ACPIGEN) += acpi_dp.o @@ -21,3 +25,5 @@ endif obj-y += facs.o obj-y += ssdt.o endif + +endif # GENERATE_ACPI_TABLE diff --git a/lib/acpi/acpi.c b/lib/acpi/acpi.c new file mode 100644 index 0000000..14b1575 --- /dev/null +++ b/lib/acpi/acpi.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Utility functions for ACPI + * + * Copyright 2023 Google LLC + */ + +#include <common.h> +#include <mapmem.h> +#include <acpi/acpi_table.h> +#include <asm/global_data.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct acpi_table_header *acpi_find_table(const char *sig) +{ + struct acpi_rsdp *rsdp; + struct acpi_rsdt *rsdt; + int len, i, count; + + rsdp = map_sysmem(gd_acpi_start(), 0); + if (!rsdp) + return NULL; + rsdt = map_sysmem(rsdp->rsdt_address, 0); + len = rsdt->header.length - sizeof(rsdt->header); + count = len / sizeof(u32); + for (i = 0; i < count; i++) { + struct acpi_table_header *hdr; + + hdr = map_sysmem(rsdt->entry[i], 0); + if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN)) + return hdr; + if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) { + struct acpi_fadt *fadt = (struct acpi_fadt *)hdr; + + if (!memcmp(sig, "DSDT", ACPI_NAME_LEN) && fadt->dsdt) + return map_sysmem(fadt->dsdt, 0); + if (!memcmp(sig, "FACS", ACPI_NAME_LEN) && + fadt->firmware_ctrl) + return map_sysmem(fadt->firmware_ctrl, 0); + } + } + + return NULL; +} |