diff --git a/core/types.h b/core/types.h
index 4ce0150..5272ab7 100644
--- a/core/types.h
+++ b/core/types.h
@@ -1,5 +1,33 @@
 #pragma once
 
+#define USHRT_MAX	((u16)(~0U))
+#define SHRT_MAX	((s16)(USHRT_MAX>>1))
+#define SHRT_MIN	((s16)(-SHRT_MAX - 1))
+#define INT_MAX		((int)(~0U>>1))
+#define INT_MIN		(-INT_MAX - 1)
+#define UINT_MAX	(~0U)
+#define LONG_MAX	((long)(~0UL>>1))
+#define LONG_MIN	(-LONG_MAX - 1)
+#define ULONG_MAX	(~0UL)
+#define LLONG_MAX	((long long)(~0ULL>>1))
+#define LLONG_MIN	(-LLONG_MAX - 1)
+#define ULLONG_MAX	(~0ULL)
+#define SIZE_MAX	(~(size_t)0)
+#define PHYS_ADDR_MAX	(~(phys_addr_t)0)
+
+#define U8_MAX		((u8)~0U)
+#define S8_MAX		((s8)(U8_MAX>>1))
+#define S8_MIN		((s8)(-S8_MAX - 1))
+#define U16_MAX		((u16)~0U)
+#define S16_MAX		((s16)(U16_MAX>>1))
+#define S16_MIN		((s16)(-S16_MAX - 1))
+#define U32_MAX		((u32)~0U)
+#define S32_MAX		((s32)(U32_MAX>>1))
+#define S32_MIN		((s32)(-S32_MAX - 1))
+#define U64_MAX		((u64)~0ULL)
+#define S64_MAX		((s64)(U64_MAX>>1))
+#define S64_MIN		((s64)(-S64_MAX - 1))
+
 #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a)-1)
 #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
 
@@ -10,6 +38,8 @@
 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a)-1)) == 0)
 
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
+
 // Virtual address
 typedef unsigned long vaddr_t;