Commit Graph

118 Commits

Author SHA1 Message Date
2bcc79216e Remove mlibc submodule. The standarc C/C++ will use later on will be added later.
It may or not be mlibc
2023-02-19 23:47:43 +01:00
b07b4f0d38 Moving certain aspects into their own static library
Problem:
	As our kernel grows we need more complex datastructures and functions these would come from
	the standard C/C++ library with normal programs.
	The kernel is a freestanding programme and has no access to standard libraries.

Solution:
	We build a mini version of the standard C/C++ library which will contain the
	datastructures and functions we want. This library can then be statically linked
	into our kernel binary.

	Making it a statically linked library also gives more structure to the project.
	Keeping these random functions and datastructures in the kernel just clutters the
	kernel source code with less relevant source code.
2023-02-19 23:38:32 +01:00
94a2de3847 Started on path resolution algorithm
- The algorithm will work once I am of better mind to deal with
raw C strings
- The resolution should look at each entry divided by '/'.
  if the entry is not there then we can quit early, however for
now I am mostly concerned with getting the names of directory entries
we would need to look for.
2023-02-19 22:17:56 +01:00
dbb147e110 Primitie listing rootdir of FAT16 filesystem 2023-02-19 14:17:47 +01:00
37542b736f Remove cpu.h and cpu.cpp in favor of i386/processor.[h|cpp]
Moving enable protected Mode to processor class
2023-02-17 22:01:32 +01:00
490529099b Started implementing the virtual file system
- The FAT command is no longer available
- At Startup the FileSystem initialise funciton
is called, it should execute the same code as the FAT command did.
- ACPI::initialise is commented out because it causes a Exception
2023-02-17 21:52:03 +01:00
133c16cae7 Added CPUID based checks 2023-02-17 16:27:36 +01:00
ecab248cd6 Clean up jump into RING 3 2023-02-17 14:46:44 +01:00
4ce7cc093b Cleanup of PCI API 2023-02-17 14:42:42 +01:00
c9a036bfbb Ring 3 ready
- Fixed issue with setting up the Task Segment Register
2023-02-13 22:44:47 +01:00
1f90a5d862 Starting to move towards proper HAL and ring3
- slight clean up of PCI driver
- Added TaskSegment header
- Rename some folders
2023-02-11 12:22:45 +01:00
520104a43a Moved reading file from disk to its own super visor terminal command
- Updated gdt assembly
- Updated Interrupt service request handlers
- Improved virtual memory manager
- NOTE: we're dependent on identity mappings for the heap to work
2023-02-08 14:07:44 +01:00
7993a2d172 Merge interrupts into dev 2023-02-05 10:30:10 +01:00
27e99fe4f2 Merged FAT16 into Dev
Hopefully with success
2023-02-03 21:47:05 +01:00
749f2aa492 Updating folders name's (1)
This should help merging into dev branch
2023-02-03 20:01:31 +01:00
891085e151 Successfully able to create a disk-image file
- Created a scripts folder
- Written instructions on how to create the disk image
- Working on a python build script that executes all other scripts

The scripts folder should contain scripts to build a full installation of
our operating system. Scripts like creating a filesystem should be found here
2023-02-02 14:59:42 +01:00
364d10d02e src folder -> source folder; makes merging with dev a bit easier. 2022-09-10 20:06:49 +02:00
68371475d9 Marking memory management features as done. Work still needs to be done but the bare minimum for memory management is there. 2022-09-03 17:38:22 +02:00
16e2354019 KERNEL: Moved serials test function into the test folder 2022-09-03 17:27:41 +02:00
a47879f404 KERNEL: First Kernel heap implementation 2022-09-03 17:27:29 +02:00
656ca0baa8 KERNEL: Pre-kernel sets up the physical memory manager.
* BUG: allocated blocks is possibly incorrect!
* prekernel no longer gets compiled as being in physical memory
2022-09-03 01:00:17 +02:00
01fcb0aa15 KERNEL: Improved Physical memory allocation code / Code refactor
* Moved tests to a different folder
* Adjusted the memory map address locations
* Improved readability of `kernel.cpp`
2022-09-02 21:09:51 +02:00
13e9beea79 KERNEL: Implementing VMM & cleaning up
Folders now are alll lower case

Started working on the implementation of the Virtual memory manager. Implemented allocate and free page funtionality for as far as I can atm.

Implemented the
2022-09-01 20:16:16 +02:00
9893a0bd17 KERNEL: Cleanup
Removing quite a few unnecessary parts.
2022-09-01 17:02:04 +02:00
a70ae5ca31 KERNEL: Mapping the bios region ( below 1Mib)
Keyboard.h: remove the incorrect use of typedef

PhysicalMemoryManager.cpp:
Map the Bios region as used. This prevents us from allocation the area used by the bios
2022-09-01 16:42:56 +02:00
15443601a6 Adding dev-scripts (Without much content) .. this can later help setting up the projects on other pc's. 2022-09-01 16:15:24 +02:00
c90e90bd84 Moving the images from the repo into the disk folder 2022-09-01 16:15:24 +02:00
a5e7fdd07e KERNEL: Physical Page Frame allocation
Rewriting the setup to allow for physical memory allocation again to work.
2022-09-01 16:15:10 +02:00
59ba41f3d2 Multiboot Memory Map get copied to a "safe" place 2022-08-23 21:35:19 +02:00
5051b8903c Divided the kernel into seperate distinct phases
The first stage after GRUB will be Pre-Kernel. This stage will organize the
information we receive from the bootloader. (in our case that will be grub)

The second stage is for now called early_main. The program will at this
point already be running in virtual higher-half / higher-quarter address space.
The goal of the second stage is to set up the kernel in such a way that we are
ready to jump in to usermode.

The third stage is for now called kernel_main. This stage will jump us into
usermode and load the startup programs.

- Added a GRUB entry for tests
- Started writing the pre-kernel stage
- Removed knowledge of multiboot from early_main
- Edited the linkerscript to link variables in pre-kernel to
	lower address space. ( from 1MB and up)
2022-08-22 21:16:34 +02:00
0f0fc9f252 Adding a skeleton for the memory management code
Moved the PMM away from being object orientated as it is just plain annoying
renamed src folder to source
Set timeout to 5 seconds in the grub config
2022-08-21 21:18:53 +02:00
e70f56a005 Improving the memory mapping boot code
Removed the need to map the extra MBI structure in as a seperate pagetable
Renaming / Restructuring the memory folder
2022-08-21 21:15:15 +02:00
560dd64e64 Kernel is working in its full former glory as a higher half kernel 2022-08-19 23:44:38 +02:00
9436e6e033 End of the day cleanup.
* Added symbol files to .gitignore
* Improved text in #PG and #GP handlers
* Added the printing of the multiboot structure address and the magic value
* Added page fault screenshot to readme
2022-08-19 01:05:10 +02:00
d280aa0584 Page faults and protetion faults will now hang with a helpful message
to explain what is going on.

I removed previously set barriers from the code to load
the kernel further.
2022-08-19 00:44:52 +02:00
7d6c823d79 Basic Launch of Higher half kernel
We now can launch the kernel at 0xC0000000 (or 3 GiB mark) with paging enabled.
A lot of early main is currently not executed to keep debugging as simple as possible
during the initial testing of higher half kernel loading.

A lot of the implementation is straight from wiki.osdev.org/Higher_Half_x86_Bare_Bones. Thanks to all the folks
who keep that wiki updated, its really resourceful.
2022-08-18 01:26:49 +02:00
bbfea39c23 Fixing include paths for new structure
Removed non-sensical libc folder from project
2022-08-17 14:57:50 +02:00
3b3e2597a1 Restructering Kernel folder before moving to higher half kernel
The boot up process will be changed somewhat dramatically, therefor a
restructering of the kernel seems as a good starting point.
2022-08-17 14:29:26 +02:00
0b0e37b762 Paging cleanup, more cpu testing and psuedo code for higher half kernel 2022-08-17 14:17:58 +02:00
388ac8e7f9 Added checks to be sure paging is actually enabled on the cpu.
- Made a special assembly file to put CPU check function in. E.G. functions to get the state of
	specific registers

In this case I have created a simple assembly function to get the contents of the CR0 register.
With the help of the c++ preprocessor the value can then be used to check if certains bits are set.
For example to check if the PG (paging) bit is set, indicating that paging is enabled for the
processor.
2022-08-16 19:06:16 +02:00
9172da075a Added identity paging basics
Followed wiki.osdev.org/Setting_Up_Paging
2022-08-15 19:51:22 +02:00
23c68d9863 Setup paging function signatures... Ready to be implemented. 2022-03-18 22:09:04 +01:00
2e2693d1ea Build some structures will need for the virtual filesystem 2022-03-15 21:56:32 +01:00
a93bf566c8 Added FAT-16 screenshot 2022-03-12 17:04:38 +01:00
2e59e6593e Add proper Physical memory management to this branch
to ensure it doesn't get too out of date

We can now run the FAT command to demo reading out the FAT16 filesystem,
however this will cause the need for a reboot as after this command. We are FOR NOW
not able to put in any new commands
2022-03-12 16:56:50 +01:00
b4cff3e667 Basic block allocation for physical memory allocation.
- 1 block = 4096 bytes : because this will make page fault handling possibly
somewhat easier

- 1 byte in the bitmap = 8 blocks of physical memory

unsure if the allocation is perfect ... guess i'll find out some day if this is actually correct.

The bitmap needs 16kb to keep track of 2gb of physical memory. Seems a decent percentage to me.
2022-02-26 20:55:34 +01:00
7330b81a10 Started definition file for a CMOS driver 2021-12-29 16:28:55 +01:00
97606dbf71 Clean up of debugging logs and new commands.
As this project grows it becomes important to keep things properly organised.
In this commit I've put some effort into making the kernel.cpp file more consise and thus improve its
readability.
Certain parts of the code have gotten their own definition file where before it
was only a header file.

- Moving the Supervisor Terminal into its own definition file.
- Subtracting debugging messages with preprocessor ifdef's
- Time and Date is now not just a header but has its own proper definition file
- Banner is displayed when booting up
- Terminal has a couple new commands

	Commmand		Description
	=================|||||===================================================
	DATE (was TIME)		Displays the curren time, date and ticks
	VERSION			Displays system version information
	MEMORY			Displays memory information
2021-12-29 16:15:18 +01:00
7496299761 Basic Intel Exceptions
Any interrupt thrown for any Intel defined Exception is not only being caught but
displays an appropriate message to the screen.

Changes made in src/kernel/idt/idt.cpp
2021-12-28 19:54:10 +01:00
0d8ef065e0 Interactive supervisor mode
To ease the pain of debuggin I can now interact with the system through a
very simplistic terminal. Hopefully things can be tested more easily by activating
the piece through a simple command. The max characters for a command is 10.

To achieve this I have had to make the following changes.
- Changed IRQ to update a global status variable
- Added a standalone keyboard driver with getKey functions
- Changed the main kernel loop to display a prompt
- Added a strncmp function to the clib/string file
2021-12-28 19:52:48 +01:00