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# 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.
# syscall.c
Syscall implentation functions for each syscall
See SYSCALLS.md
# term.c
Manages text terminal. All text printed to standard out or err will be printed
to this terminal.
- contains a terminal buffer for allowing scrolling of the screen
- manages redrawing the terminal when scrolling or changing terminal handler
- vga text mode v.s. gpu framebuffer
# user.c
Loads user ELF binaries into memory and initalizes them into a PCB.
See PCB.md
- `user_load` - load a user process form the filesystem into memory
- `user_clone` - clones the user process
- `user_cleanup` - cleans up a user process
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