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acpi/acpigen: introduce acpigen_write_processor_device

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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 <felix-coreboot@felixheld.de>
Change-Id: Ifb0da903a972be134bb3b9071f81b441f60917d1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72469
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
This commit is contained in:
Felix Held
2023-01-28 03:37:21 +01:00
parent 501f2f9cbc
commit 32bba1877b
2 changed files with 14 additions and 0 deletions
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9
src/acpi/acpigen.c
View File

@@ -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)
{

5
src/include/acpi/acpigen.h
View File

@@ -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);