PAL file for arm zephyr executor runner

Author: BujSet

runtime/platform/default/arm_zephyr.hpp

@@ -0,0 +1,52 @@
+#ifndef _ARM_ZEPHYR_PAL_HPP
+#define _ARM_ZEPHYR_PAL_HPP
+
+#include <zephyr/kernel.h>
+#include <zephyr/sys/printk.h>
+
+void et_pal_init(void) {}
+
+ET_NORETURN void et_pal_abort(void) {
+    _exit(-1);
+}
+
+et_timestamp_t et_pal_current_ticks(void) {
+    return k_uptime_ticks();
+}
+
+et_tick_ratio_t et_pal_ticks_to_ns_multiplier(void) {
+  // Since we don't know the CPU freq for your target and just cycles in the
+  // FVP for et_pal_current_ticks() we return a conversion ratio of 1
+  return {1, 1};
+}
+
+/**
+ * Emit a log message via platform output (serial port, console, etc).
+ */
+void et_pal_emit_log_message(
+    ET_UNUSED et_timestamp_t timestamp,
+    et_pal_log_level_t level,
+    const char* filename,
+    ET_UNUSED const char* function,
+    size_t line,
+    const char* message,
+    ET_UNUSED size_t length) {
+  fprintf(
+      stderr,
+      "%c [executorch:%s:%zu %s()] %s\n",
+      level,
+      filename,
+      line,
+      function,
+      message);
+}
+
+void* et_pal_allocate(ET_UNUSED size_t size) {
+    return k_malloc(size);
+}
+
+void et_pal_free(ET_UNUSED void* ptr) {
+    k_free(ptr);
+} 
+
+#endif // _ARM_ZEPHYR_PAL_HPP