1 files changed, 109 insertions, 0 deletions
diff --git a/docs/MODULES.md b/docs/MODULES.md
new file mode 100644
index 0000000..cf452ff
--- /dev/null
+++ b/docs/MODULES.md
@@ -0,0 +1,109 @@
+# modules
+
+list of all kernel modules and their functions
+
+## cpu/
+
+Initalizes all cpu components and low level tabels.
+- FPU / SSE / AVX
+- IDT (Interrupt Descriptor Table)
+- PIC (Programmable Interrupt Controller)
+- TSS (Task State Segment)
+  - used for allowing kernel to switch into ring 3
+  - used for setting kernel stack on interrupt
+
+## drivers/
+
+Folder `drivers/` contains drivers for the system. See DRIVERS.md.
+
+File `drivers.c` loads each of the drivers in `drivers/`.
+
+## efi/
+
+Load UEFI components
+- UEFI memory map
+- GOP (Graphics Output Protocol), UEFI framebuffer
+
+## entry.S
+
+Entry point into the kernel along with:
+- GDT (Global Descriptor Table)
+- Multiboot header see https://www.gnu.org/software/grub/manual/multiboot2/multiboot.html
+- Inital kernel stack
+  - not used once interrupts since interrupt stack will be used
+- Inital page tables
+  - see MEMORY.md
+
+Symbols:
+- `_start`
+  - generic legacy bios entrypoint in IA-32 mode
+
+- `_start_efi`
+  - uefi entrypoint in IA-32e mode
+
+## font/
+
+Loads psf2 font files into kernel .rodata segment
+
+## fs/
+
+See FS.md
+
+## include/
+
+All kernel headers.
+
+- SEE HEADERS.md
+
+## input.c
+
+Abstracts all input from all sources over a single keycode / mouseevent buffer.
+- uses ps2 and uart
+
+## lib/
+
+Kernel c library
+
+Notable files:
+
+- `backtrace.c` - does stack backtraces and logs them to output
+  - used during exceptions
+- `kspin.c`
+  - spinlock in kernel space
+- `panic.c`
+  - implements panic functions, along with halt called during exceptions or panic
+
+## main.c
+
+Kernel main entrypoint.
+- Loads all components of the kernel in order.
+- Loads init process
+- Dispatches init
+
+## mboot/
+
+Laod information provided by multiboot standard
+- `efi.c` - gets `EFI_SYSTEM_TABLE` & `EFI_HANDLE`
+  - read UEFI standard for more information
+- `mmap.c` - load memory map when in legacy boot
+  - memory map is loaded from `efi/` module when booting from UEFI
+- `module.c`
+  - loads initrd (ramdisk)
+- `rsdp.c`
+  - load root ACPI table, provided for the ACPI driver
+
+## memory/
+
+See MEMORY.md
+
+## procs.c
+
+Stores loaded process information and scheduler
+- multiple queues for scheduling
+  - ready - pcb is ready to be executed
+  - zombie - pcb is a zombie, and waiting to be cleaned up
+  - syscall - replaced blocked/waiting in baseline
+    - each syscall has its own queue
+    - acessed though syscall_queue[SYS_num]
+
+See PCB.md for pcb information.