+#define KSTACK_SIZE (64 << 10)
+#define KSTACK_START ((0x3FFFFFU - KSTACK_SIZE) + 1)
+#define KSTACK_TOP 0x3FFFF0U
+
+#define KERNEL_MM_BASE 0xC0000000
+#define MEM_1MB 0x100000
+#define MEM_4MB 0x400000
+
+#define KCODE_MAX_SIZE MEM_4MB
+#define KHEAP_START (KERNEL_MM_BASE + KCODE_MAX_SIZE)
+#define KHEAP_SIZE_MB 256