Memory Layout

Sinux loads at the traditional 1 MiB mark and manages physical memory above the kernel through a bitmap-based physical memory manager (PMM).

0x000000 - 0x0FFFFF    Low memory (BIOS, reserved)
0x100000               Kernel load address (1 MiB)
0x200000               PMM bitmap
[kernel BSS]           Page tables, kernel stack (32 KiB)
[above kernel]         Free physical pages (PMM managed)
/                      ramfs (in RAM, lost on reboot)
/mnt/disk              ext2 on ATA drive (persistent)
/proc                  procfs (kernel info)

Notes

The PMM bitmap tracks which physical pages are free or used.
The kernel stack is 32 KiB.
/ is backed by ramfs and is therefore volatile — its contents are lost on reboot.
/mnt/disk is backed by ext2 on an ATA drive and provides persistent storage.
/proc exposes kernel information via procfs.

See the boot flow for how paging is enabled before the kernel runs.

Notes​

Notes