+#define KERNEL_MM_BASE 0xC0000000
+
+#define KCODE_MAX_SIZE MEM_4MB
+// #define KHEAP_START (KERNEL_MM_BASE + KCODE_MAX_SIZE)
+// #define KHEAP_SIZE_MB 256
+
+#define VGA_FRAMEBUFFER 0xB8000
+
+#define KCODE_SEG 0x08
+#define KDATA_SEG 0x10
+#define UCODE_SEG 0x1B
+#define UDATA_SEG 0x23
+#define TSS_SEG 0x28
+
+#define USER_START 0x400000
+#define USTACK_SIZE 0x100000
+#define USTACK_TOP 0x9ffffff0
+#define USTACK_END (0x9fffffff - USTACK_SIZE + 1)
+#define UMMAP_AREA 0x4D000000