From 12d0be482eac9a4447c1a448fb7de0feef55d933 Mon Sep 17 00:00:00 2001
From: Christoph Urlacher <christoph.urlacher@protonmail.com>
Date: Wed, 28 Jan 2026 18:54:18 +0100
Subject: [PATCH] baremetal: add baremetal platform

---
 CMakeLists.txt                                |   2 +-
 .../shared/platform/baremetal/platform_init.c | 120 ++++++++++++++++++
 .../platform/baremetal/platform_internal.h    |  72 +++++++++++
 .../platform/baremetal/shared_platform.cmake  |  12 ++
 4 files changed, 205 insertions(+), 1 deletion(-)
 create mode 100644 core/shared/platform/baremetal/platform_init.c
 create mode 100644 core/shared/platform/baremetal/platform_internal.h
 create mode 100644 core/shared/platform/baremetal/shared_platform.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b28fa89..6031b7c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -150,7 +150,7 @@ endif ()
 include (${SHARED_DIR}/utils/uncommon/shared_uncommon.cmake)
 
 set (THREADS_PREFER_PTHREAD_FLAG ON)
-find_package(Threads REQUIRED)
+# find_package(Threads REQUIRED)
 
 add_library (vmlib ${WAMR_RUNTIME_LIB_SOURCE})
 set_target_properties (vmlib PROPERTIES OUTPUT_NAME iwasm)
diff --git a/core/shared/platform/baremetal/platform_init.c b/core/shared/platform/baremetal/platform_init.c
new file mode 100644
index 00000000..709e34b3
--- /dev/null
+++ b/core/shared/platform/baremetal/platform_init.c
@@ -0,0 +1,120 @@
+#include "platform_api_vmcore.h"
+
+/****************************************************
+ *                     Section 1                    *
+ *        Interfaces required by the runtime        *
+ ****************************************************/
+
+/**
+ * Initialize the platform internal resources if needed,
+ * this function is called by wasm_runtime_init() and
+ * wasm_runtime_full_init()
+ *
+ * @return 0 if success
+ */
+
+int
+bh_platform_init()
+{
+    return 0;
+}
+
+void
+bh_platform_destroy()
+{
+}
+
+/**
+ ******** memory allocator APIs **********
+ */
+
+// void *
+// os_malloc(unsigned size);
+//
+// void *
+// os_realloc(void *ptr, unsigned size);
+//
+// void
+// os_free(void *ptr);
+
+/**
+ * Note: the above APIs can simply return NULL if wasm runtime
+ *       isn't initialized with Alloc_With_System_Allocator.
+ *       Refer to wasm_runtime_full_init().
+ */
+
+int
+os_printf(const char *format, ...)
+{
+    return 0;
+}
+
+int
+os_vprintf(const char *format, va_list ap)
+{
+    return 0;
+}
+
+/**
+ * Get microseconds after boot.
+ */
+// uint64
+// os_time_get_boot_us(void);
+
+/**
+ * Get thread-specific CPU-time clock in microseconds
+ */
+// uint64
+// os_time_thread_cputime_us(void);
+
+/**
+ * Get current thread id.
+ * Implementation optional: Used by runtime for logging only.
+ */
+// korp_tid
+// os_self_thread(void);
+
+/**
+ * Get current thread's stack boundary address, used for runtime
+ * to check the native stack overflow. Return NULL if it is not
+ * easy to implement, but may have potential issue.
+ */
+// uint8 *
+// os_thread_get_stack_boundary(void);
+
+/**
+ * Set whether the MAP_JIT region write protection is enabled for this thread.
+ * Pass true to make the region executable, false to make it writable.
+ */
+// void
+// os_thread_jit_write_protect_np(bool enabled);
+
+/**
+ ************** mutext APIs ***********
+ *  vmcore:  Not required until pthread is supported by runtime
+ *  app-mgr: Must be implemented
+ */
+
+int
+os_mutex_init(korp_mutex *mutex)
+{
+    return 0;
+}
+
+int
+os_mutex_destroy(korp_mutex *mutex)
+{
+    return 0;
+}
+
+int
+os_mutex_lock(korp_mutex *mutex)
+{
+    return 0;
+}
+
+int
+os_mutex_unlock(korp_mutex *mutex)
+{
+    return 0;
+}
diff --git a/core/shared/platform/baremetal/platform_internal.h b/core/shared/platform/baremetal/platform_internal.h
new file mode 100644
index 00000000..c44b0bfb
--- /dev/null
+++ b/core/shared/platform/baremetal/platform_internal.h
@@ -0,0 +1,72 @@
+#ifndef _PLATFORM_INTERNAL_H
+#define _PLATFORM_INTERNAL_H
+
+#include <inttypes.h>
+#include <stdbool.h>
+// #include <assert.h>
+// #include <time.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+// #include <stdarg.h>
+#include <ctype.h>
+// #include <pthread.h>
+// #include <signal.h>
+#include <semaphore.h>
+// #include <limits.h>
+#include <dirent.h>
+// #include <fcntl.h>
+// #include <unistd.h>
+// #include <poll.h>
+// #include <sched.h>
+// #include <errno.h>
+// #include <sys/types.h>
+// #include <sys/stat.h>
+// #include <sys/mman.h>
+// #include <sys/time.h>
+// #include <sys/timeb.h>
+// #include <sys/uio.h>
+// #include <sys/ioctl.h>
+// #include <sys/socket.h>
+// #include <sys/resource.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef BH_PLATFORM_BAREMETAL
+#define BH_PLATFORM_BAREMETAL
+#endif
+
+#define BH_APPLET_PRESERVED_STACK_SIZE (8 * 1024)
+#define BH_THREAD_DEFAULT_PRIORITY 0
+
+typedef pthread_t korp_tid;
+typedef pthread_mutex_t korp_mutex;
+typedef pthread_cond_t korp_cond;
+typedef pthread_t korp_thread;
+typedef pthread_rwlock_t korp_rwlock;
+typedef sem_t korp_sem;
+
+typedef int os_file_handle;
+typedef DIR *os_dir_stream;
+typedef int os_raw_file_handle;
+
+static inline os_file_handle
+os_get_invalid_handle(void)
+{
+    return -1;
+}
+
+static inline int
+os_getpagesize()
+{
+    return 4096;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _PLATFORM_INTERNAL_H */
diff --git a/core/shared/platform/baremetal/shared_platform.cmake b/core/shared/platform/baremetal/shared_platform.cmake
new file mode 100644
index 00000000..a123d693
--- /dev/null
+++ b/core/shared/platform/baremetal/shared_platform.cmake
@@ -0,0 +1,12 @@
+set (PLATFORM_SHARED_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+add_definitions(-DBH_PLATFORM_BAREMETAL)
+
+include_directories(${PLATFORM_SHARED_DIR})
+include_directories(${PLATFORM_SHARED_DIR}/../include)
+
+file (GLOB_RECURSE source_all ${PLATFORM_SHARED_DIR}/*.c)
+set (PLATFORM_SHARED_SOURCE ${source_all})
+
+file (GLOB header ${PLATFORM_SHARED_DIR}/../include/baremetal/*.h)
+LIST (APPEND RUNTIME_LIB_HEADER_LIST ${header})