The following list records the commit hashes correspond to the topics

NOTE: the undermentioned commits does not directly reference the topic but aggregated code that resemble the topic

1.  (asm and multiboot) ca038e65d1ccf0dae9e624baa4b4d173ea8ad175
2.  (hello kernel world) e0ee3d449aacd33a84cb1f58961e55f9f06acb46
3.  (protected mode) 0264889df8dd6775d765416a13804bc4ed8cc3f7
4.  (gdt setup) fedfd71f5492177a7c7d7fd2bd1529a832106395
5.  (interrupts) 8ef44e8d53fcd532d6c581e1984532df3f01c7b8
6.  (virtual memory) e141fd4dcd5effc2dbe59a498d7ea274b7199147
7.  (malloc) 4c6d990440cdba6c7dd294adb7e435770ffcbcc4
8.  (acpi and apic) 287a5f7ae6a3bec3d679a5de394e915b56c7367d
9.  (ps2 keyboard) af336b49c908dc0d2b62846a19001d4dac7cad61
10. (multitasking) 088403ac98acf7991507715d29a282dcba222053
11. (signal) eb251af8672e033f29322253f136e09c76f2b0a3
12. (pci and ioremap/iounmap) 03944e7734220bf7e7aa7b7113bcbdf9c22808a5
13. (sata-ahci) e8e64a4f1d76aaeac3defa13243505cccd25c078
14. (vfs) 96cf56ea15a22b8b362aac6c3ab202d2608e9151