Add a new method to write the processor device identified by _HID ACPI0007, that is preferred over the Processor OpCode since ACPI 6.0.
Fixes booting arm using ACPI only since the Processor OpCode isn't found valid by the Linux kernel.
Signed-off-by: Patrick Rudolph patrick.rudolph@9elements.com Reviewed-by: Simon Glass sjg@chromium.org Cc: Simon Glass sjg@chromium.org --- include/acpi/acpigen.h | 12 ++++++++++++ lib/acpi/acpigen.c | 11 +++++++++++ 2 files changed, 23 insertions(+)
diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h index 3aa94d70b9..16df85b9c1 100644 --- a/include/acpi/acpigen.h +++ b/include/acpi/acpigen.h @@ -833,6 +833,7 @@ void acpigen_write_dsm_end(struct acpi_ctx *ctx); * * This emits a Processor package header with the required information. The * caller must complete the information and call acpigen_pop_len() at the end + * Deprecated since ACPI 6.0. * * @ctx: ACPI context pointer * @cpuindex: CPU number @@ -842,6 +843,17 @@ void acpigen_write_dsm_end(struct acpi_ctx *ctx); void acpigen_write_processor(struct acpi_ctx *ctx, uint cpuindex, u32 pblock_addr, uint pblock_len);
+/** + * acpigen_write_processor_device() - Write a Processor device + * + * Write a device with _HID ACPI0007 identifying a processor. + * Replacement for the Processor OpCode. + * + * @ctx: ACPI context pointer + * @cpuindex: CPU number + */ +void acpigen_write_processor_device(struct acpi_ctx *ctx, uint cpuindex); + /** * acpigen_write_processor_package() - Write a package containing the processors * diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c index ecff5a50d5..fa9dad32a3 100644 --- a/lib/acpi/acpigen.c +++ b/lib/acpi/acpigen.c @@ -361,6 +361,17 @@ void acpigen_write_processor(struct acpi_ctx *ctx, uint cpuindex, acpigen_emit_byte(ctx, pblock_len); }
+void acpigen_write_processor_device(struct acpi_ctx *ctx, uint cpuindex) +{ + char pscope[16]; + + snprintf(pscope, sizeof(pscope), ACPI_CPU_STRING, cpuindex); + acpigen_write_device(ctx, pscope); + acpigen_write_name_string(ctx, "_HID", "ACPI0007"); + acpigen_write_name_integer(ctx, "_UID", cpuindex); + acpigen_pop_len(ctx); /* Device */ +} + void acpigen_write_processor_package(struct acpi_ctx *ctx, const char *const name, const uint first_core,