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Meanwhile, take a look at typical memory map, 0x0 address is the beginning...
-------------------------------------------------------------------------------- | Address | Size | Purpose | -------------------------------------------------------------------------------- | 0x0000_0000 | 0x0000_FFFF | BIOS and System Firmware | | 0x0001_0000 | 0x0000_FFFF | Reserved for Expansion ROM | | 0x000F_0000 | 0x0001_0000 | BIOS Shadow RAM | | 0x0010_0000 | Variable | Video Memory (Graphics Buffer) | | 0x0020_0000 | 0x0009_FFFF | Conventional Memory (RAM) | | 0x00A0_0000 | Variable | Hardware Devices (I/O Ports) | | 0x0100_0000 | Variable | Additional Expansion ROM (Optional) | | 0x1000_0000 | Variable | Extended Memory (RAM) | | 0xA000_0000 | Variable | Graphics Memory (VRAM) | | 0xC000_0000 | Variable | Memory-Mapped Hardware Devices | | 0xFF80_0000 | 0x0080_0000 | Reserved for System Management Mode (SMM) | | 0xFFFF_0000 | 0x0001_0000 | Memory-Mapped I/O (MMIO) | --------------------------------------------------------------------------------