Add some more MMIO, smcCpuOn

exosphere/timers.c

@@ -0,0 +1,18 @@
+#include "timers.h"
+
+volatile void *g_timer_registers = NULL;
+
+void set_timer_address(void *timer_base) {
+    g_timer_registers = timer_base;
+}
+
+inline void *get_timer_address(void) {
+    return g_timer_registers;
+}
+
+void wait(uint32_t microseconds) {
+    uint32_t old_time = TIMERUS_CNTR_1US_0;
+    while (TIMERUS_CNTR_1US_0 - old_time <= result) {
+        /* Spin-lock. */
+    }
+}