From 32bba1877ba6d248406a56cd97dce777d499aaa6 Mon Sep 17 00:00:00 2001 From: Felix Held Date: Sat, 28 Jan 2023 03:37:21 +0100 Subject: acpi/acpigen: introduce acpigen_write_processor_device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The ACPI PROCESSOR_OP has been deprecated in ACPI 6.0 and dropped in ACPI 6.4 and is now permanently reserved. As a replacement, DEVICE_OP with the special HID ACPI0007 should be used instead. This special HID was introduced in version 3 of the ACPI spec. To have a function to generate this, acpigen_write_processor_device is introduced. The CPU index is used as UID which can be assumed to be unique. Signed-off-by: Felix Held Change-Id: Ifb0da903a972be134bb3b9071f81b441f60917d1 Reviewed-on: https://review.coreboot.org/c/coreboot/+/72469 Reviewed-by: Elyes Haouas Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki --- src/acpi/acpigen.c | 9 +++++++++ src/include/acpi/acpigen.h | 5 +++++ 2 files changed, 14 insertions(+) (limited to 'src') diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c index b8f1dfbb9c..305cddb0f0 100644 --- a/src/acpi/acpigen.c +++ b/src/acpi/acpigen.c @@ -409,6 +409,15 @@ void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len) acpigen_emit_byte(pblock_len); } +void acpigen_write_processor_device(unsigned int cpu_index) +{ + acpigen_emit_ext_op(DEVICE_OP); + acpigen_write_len_f(); + acpigen_write_processor_namestring(cpu_index); + acpigen_write_name_string("_HID", "ACPI0007"); + acpigen_write_name_integer("_UID", cpu_index); +} + void acpigen_write_processor_package(const char *const name, const unsigned int first_core, const unsigned int core_count) { diff --git a/src/include/acpi/acpigen.h b/src/include/acpi/acpigen.h index ac0cab2b6e..c506021d32 100644 --- a/src/include/acpi/acpigen.h +++ b/src/include/acpi/acpigen.h @@ -455,6 +455,11 @@ __always_inline void acpigen_write_processor_end(void) { acpigen_pop_len(); } +void acpigen_write_processor_device(unsigned int cpu_index); +__always_inline void acpigen_write_processor_device_end(void) +{ + acpigen_pop_len(); +} void acpigen_write_processor_package(const char *name, unsigned int first_core, unsigned int core_count); -- cgit v1.2.3