diff --git a/sdk/head/ptdef.h b/sdk/head/ptdef.h
new file mode 100644
index 0000000..8eca077
--- /dev/null
+++ b/sdk/head/ptdef.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2026, Chloe M., et al.
+ * Provided under the BSD-3 clause
+ *
+ * Description: Standard system definitions
+ * Author:      Chloe M.
+ */
+
+#ifndef _SDK_PTDEF_H_
+#define _SDK_PTDEF_H_ 1
+
+/* Boolean values */
+#define true 1
+#define false 0
+
+/* Compiler specific definitions */
+#define ASMV              __asm__ __volatile__
+#define ATTR(x)           __attribute__((x))
+#define SECTION(x)        ATTR(section((x)))
+#define ALIGN(n)          ATTR(aligned((n)))
+#define PACKED            ATTR(packed)
+#define NO_RETURN         ATTR(noreturn)
+#define ALWAYS_INLINE     ATTR(always_inline)
+#define BARRIER()         ASMV("" ::: "memory")
+#define UNREACHABLE()      __builtin_unreachable()
+
+/* Pointer offset macros */
+#define PTR_OFFSET(p, off) ((void *)(char *)(p) + (off))
+#define PTR_NOFFSET(p, off) ((void *)(char *)(p) - (off))
+
+/* Bit related macros */
+#define BIT(n) (1ULL << (n))
+#define ISSET(v, f)  ((v) & (f))
+
+/* Align up/down a value */
+#define ALIGN_DOWN(value, align)      ((value) & ~((align)-1))
+#define ALIGN_UP(value, align)        (((value) + (align)-1) & ~((align)-1))
+
+/* Bitmap helper macros */
+#define SETBIT(a, b) ((a)[(b) >> 3] |= BIT(b % 8))
+#define CLRBIT(a, b) ((a)[(b) >> 3] &= ~BIT(b % 8))
+#define TESTBIT(a, b) (ISSET((a)[(b) >> 3], BIT(b % 8)))
+
+/* Min/max macros */
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
+
+/* Get number of array elements */
+#define NELEM(a) (sizeof(a) / sizeof(a[0]))
+
+/* Basic types */
+typedef void VOID;
+typedef _Bool BOOLEAN;
+
+/* Basic signed types */
+typedef char CHAR;
+typedef short SHORT;
+typedef int LONG;
+typedef long long QUAD;
+typedef QUAD SSIZE;
+
+/* Basic unsigned types */
+typedef unsigned char UCHAR;
+typedef unsigned short USHORT;
+typedef unsigned int ULONG;
+typedef unsigned long long UQUAD;
+typedef UQUAD USIZE;
+typedef UQUAD UPTR;
+
+#ifndef __GNUC_VA_LIST
+#define __GNUC_VA_LIST
+typedef __builtin_va_list __gnuc_va_list;
+#endif      /* __GNUC_VA_LIST */
+
+typedef __gnuc_va_list va_list;
+
+#define va_start(ap, last)  __builtin_va_start((ap), last)
+#define va_end(ap)          __builtin_va_end((ap))
+#define va_arg(ap, type)    __builtin_va_arg((ap), type)
+
+#if !defined(__cplusplus)
+#define NULL  ((VOID *)0)
+#else
+#if __cplusplus >= 201103L
+#define NULL  nullptr
+#else
+#define NULL ((VOID *)0)
+#endif  /* __cplusplus >= 201103L */
+#endif  /* __cplusplus */
+
+#endif /* !_SDK_PTDEF_H_ */