demo: initial commit

1 files changed, 43 insertions, 0 deletions

diff --git a/demo/smp.c b/demo/smp.c
new file mode 100644
index 0000000..f0f83e7
--- /dev/null
+++ b/demo/smp.c
@@ -0,0 +1,43 @@
+#include "demo.h"
+
+#define SMP_CTRL_BASE 0x30140000
+#define SMP_CTRL      (*(volatile unsigned *)SMP_CTRL_BASE)
+
+int cpus_ready(void)
+{
+	return SMP_CTRL == 0;
+}
+
+void run_cpu(unsigned num)
+{
+	run_cpus(1 << num);
+}
+
+void run_cpus(unsigned mask)
+{
+	unsigned ctrl_word = 0;
+	for (unsigned cpu = 0; cpu < NUM_CPUS; ++cpu)
+		if (mask & (1 << cpu)) {
+			print("run cpu%u", cpu);
+			ctrl_word |= 0b001 << (cpu * 8);
+		}
+
+	SMP_CTRL = ctrl_word;
+}
+
+void halt_cpu(unsigned num)
+{
+	halt_cpu(1 << num);
+}
+
+void halt_cpus(unsigned mask)
+{
+	unsigned ctrl_word = 0;
+	for (unsigned cpu = 0; cpu < NUM_CPUS; ++cpu)
+		if (mask & (1 << cpu)) {
+			print("halt cpu%u%s", cpu, cpu == this_cpu->num ? " (myself)" : "");
+			ctrl_word |= 0b010 << (cpu * 8);
+		}
+
+	SMP_CTRL = ctrl_word;
+}