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Meanwhile, take a look at typical memory map, 0x0 address is the beginning...

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| Address      | Size          | Purpose                                       |
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| 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)                      |
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