Update memory layout

Author: scopeInfinity

memory_layout.md

@@ -2,12 +2,15 @@
 
 | From      | To        | Size      | Usage                                         |
 |---------  |--------   |--------   |--------------------------------------------   |
-| 0x00000   | fill      | 31KB      | RESERVED                                      |
-| 0x7C00    | 0x7DFF    | 512B      | BOOTLOADER STAGE 1                            |
-| 0x7E00    | 0x7FFF    | 512B      | SHARED STATIC CODE for real_mode library      |
-| 0x8000    | 0xBFFF    | -         | BOOT LOADER STAGE 2  + own stack              |
-| 0x10000   | 0x2FFFF   | -         | KERNEL                                        |
-| 0x30000   | 0x4FFFF   | -         | Application 0                                 |
-| 0x50000   | 0x6FFFF   | -         | Application 1                                 |
-...
-| -         | 0xFFFFF   | -         | 20-bit memory limit                           |
+| 0x00000   | 0x003FF   | -         | IVT (standard)                                |
+| 0x00400   | 0x07BFF   | -         | BIOS data area + reserv                       |
+| 0x07C00   | 0x07DFF   | 512B      | Bootloader Stage 1                            |
+| 0x07E00   | 0x07FFF   | 512B      | STATIC CODE for real_mode library             |
+| 0x08000   | 0x0BFFF   | -         | Bootloader Stage 2  + own stack               |
+| 0x0F000   | 0x2EFFF   | 128KB     | Kernel  + (core, irq, syscall) stack          |
+| 0x30000   | 0x4FFFF   | 128KB     | App pid 1                                     |
+| 0x50000   | 0x6FFFF   | 128KB     | App pid 2                                     |
+| 0x70000   | -         | -         | -                                             |
+| 0x80000   | 0x9FFFF   | 128KB     | Extended BIOS Data area                       |
+| 0xA0000   | 0xBFFFF   | 128KB     | Video memory                                  |
+| 0xC0000   | 0xFFFFF   | 256KB     | BIOS stuff                                    |