advos
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Developing an operating system from scratch (Advent Calendar 2018)
advos
advos had been developed for my advent calendar 2018 project. See https://ja.tech.jar.jp/ac/2018/day00.html (in Japanese) for the detailed description.
How to execute
$ docker-compose build
$ docker-compose run qemu
Memory Management
Virtual memory blocks
00000000 00000000--00000000 bfffffff: User process00000000 c0000000--00000000 ffffffff: Kernel00000001 00000000--XXXXXXXX XXXXXXXX: Linear mapping to physical memoryXXXXXXXX XXXXXXXX-- : (User process if needed)
Physical memory
Memory Zones
- ZONE_DMA: 0x00000000 -- 0x01000000 (0--16 MiB)
- ZONE_KERNEL: 0x01000000 -- 0x04000000 (16--64 MiB)
- ZONE_NUMA_AWARE: 0x04000000 -- (64-- MiB)
Memory Map
| Start | End | Description |
|---|---|---|
00000500 |
00007bff |
Stack of boot loader |
00007c00 |
00007dff |
MBR |
00007e00 |
00007fff |
Reserved |
00008000 |
00008fff |
Boot information (e.g., drive number, system memory map) |
00009000 |
0000cfff |
Boot monitor (16 KiB) |
0000d000 |
0000ffff |
Reserved for boot monitor |
00010000 |
0002ffff |
Kernel (up to 128 KiB) |
00030000 |
0004ffff |
initrd (up to 128 KiB) |
00050000 |
0005ffff |
Reserved |
00060000 |
00067fff |
Per-core data (256-byte * 128) |
00068000 |
00068e00 |
Global variables |
00068f00 |
00068fff |
Global variables for assembly |
00069000 |
0006ffff |
MOVED: Kernel's base page table |
00070000 |
00073fff |
trampoline (16 KiB) |
00074000 |
00075fff |
GDT (8 KiB) |
00076000 |
00077fff |
IDT (8 KiB) |
00078000 |
00078fff |
TSS for BSP |
00079000 |
0007ffff |
Moved: Page table for long mode (Must be >= 24 KiB = 6 * 4 KiB) |
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