npc: wip, cannot build

npc/csrc/devices/rtc.cpp

@@ -0,0 +1,49 @@
+#include <cstdint>
+#include <devices.hpp>
+
+namespace Devices {
+uint64_t RTC::get_time_internal() {
+#if defined(CONFIG_TARGET_AM)
+  uint64_t us = io_read(AM_TIMER_UPTIME).us;
+#elif defined(CONFIG_TIMER_GETTIMEOFDAY)
+  struct timeval now;
+  gettimeofday(&now, NULL);
+  uint64_t us = now.tv_sec * 1000000 + now.tv_usec;
+#else
+  struct timespec now;
+  clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
+  uint64_t us = now.tv_sec * 1000000 + now.tv_nsec / 1000;
+#endif
+  return us;
+}
+
+uint64_t RTC::get_time() {
+  if (boot_time == 0)
+    boot_time = get_time_internal();
+  uint64_t now = get_time_internal();
+  return now - boot_time;
+}
+
+RTC::RTC(uint64_t addr, size_t len) : Device(addr, len, buf) {
+  *(uint64_t *)buf = 0;
+};
+
+void RTC::io_handler(uint32_t offset, size_t len, bool is_write) {
+  assert(offset == 0 || offset == 4);
+  if (!is_write && offset == 4) {
+    uint64_t us = get_time();
+    buf[0] = (uint32_t)us;
+    buf[1] = us >> 32;
+  }
+}
+
+// void RTC::transfer(uint8_t *src, size_t len, bool is_write) {
+//   if (is_write) {
+//     for (size_t i = 0; i < len; i++)
+//       buf[i] = src[i];
+//   } else {
+//     for (size_t i = 0; i < len; i++)
+//       src[i] = buf[i];
+//   }
+// }
+} // namespace Devices