cpu: Add cpu_idle() which we call when waiting for a job

For now a simple generic implementation using cpu_relax()

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/core/cpu.c b/core/cpu.c
index 79cb70c..529232d 100644
--- a/core/cpu.c
+++ b/core/cpu.c
@@ -212,6 +212,24 @@ void cpu_process_jobs(void)
 	unlock(&cpu->job_lock);
 }
 
+static void cpu_idle_default(enum cpu_wake_cause wake_on __unused)
+{
+	/* Maybe do something better for simulators ? */
+	cpu_relax();
+	cpu_relax();
+	cpu_relax();
+	cpu_relax();
+}
+
+void cpu_idle(enum cpu_wake_cause wake_on)
+{
+	switch(proc_gen) {
+	default:
+		cpu_idle_default(wake_on);
+		break;
+	}
+}
+
 void cpu_process_local_jobs(void)
 {
 	struct cpu_thread *cpu = first_available_cpu();