arch/x86/acpigen.c: Add a method to notify all CPU cores

Change-Id: If8b07fdcec51c344a82309d4af3b6127ad758baf
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/29895
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index 426a5426b7..290893d719 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -369,6 +369,23 @@ void acpigen_write_processor_package(const char *const name,
 	acpigen_pop_len();
 }
 
+/* Method to notify all CPU cores */
+void acpigen_write_processor_cnot(const unsigned int number_of_cores)
+{
+	int core_id;
+
+	acpigen_write_method("\\_PR.CNOT", 1);
+	for (core_id = 0; core_id < number_of_cores; core_id++) {
+		char buffer[DEVICE_PATH_MAX];
+		snprintf(buffer, sizeof(buffer), CONFIG_ACPI_CPU_STRING,
+			 core_id);
+		acpigen_emit_byte(NOTIFY_OP);
+		acpigen_emit_namestring(buffer);
+		acpigen_emit_byte(ARG0_OP);
+	}
+	acpigen_pop_len();
+}
+
 /*
  * Generate ACPI AML code for OperationRegion
  * Arg0: Pointer to struct opregion opreg = OPREGION(rname, space, offset, len)
diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h
index a27bd6f277..d9379eb25a 100644
--- a/src/arch/x86/include/arch/acpigen.h
+++ b/src/arch/x86/include/arch/acpigen.h
@@ -277,6 +277,7 @@ void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len);
 void acpigen_write_processor_package(const char *name,
 				     unsigned int first_core,
 				     unsigned int core_count);
+void acpigen_write_processor_cnot(const unsigned int number_of_cores);
 void acpigen_write_TSS_package(int entries, acpi_tstate_t *tstate_list);
 void acpigen_write_TSD_package(u32 domain, u32 numprocs, PSD_coord coordtype);
 void acpigen_write_mem32fixed(int readwrite, u32 base, u32 size);