saalty's unnamed OS | Operating System Development | Page 2

slim edge Apr 5, 2024, 11:46 PM

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i don't think the rewrite was that significant

daring citrus Apr 6, 2024, 6:39 AM

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think again

bitter echo Apr 6, 2024, 7:57 AM

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Windows.UI.Xaml.Phone.dll lol

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and maps wtf

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that cant be real

woeful rover Apr 6, 2024, 9:57 AM

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daring citrus think again

yes, i think this is most likely worth foregoing

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the pervious notepad should be much more basic

slim edge Apr 6, 2024, 9:57 AM

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daring citrus think again

oh they xml'd it

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ig at least they're making everything consistent :^)

snow cloud Apr 6, 2024, 11:34 AM

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INK CONTR... WHA

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what does that even do?!

still pebble Apr 6, 2024, 11:37 AM

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they done put maps in notepad

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bruh

snow cloud Apr 6, 2024, 3:01 PM

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what would that even be useful for?

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there isn't even a feature in notepad which makes use of it

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at least apparently

still pebble Apr 9, 2024, 8:57 PM

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snow cloud what would that even be useful for?

this is such a late response to your question but i think it would be nice if you could put a link to google maps/similar service and it would embed the map view and controls into the notepad

snow cloud Apr 9, 2024, 8:58 PM

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Maybe Microsoft Word but.. notepad? Really?

still pebble May 22, 2024, 10:48 AM

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XHCI is now working

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Here is mouse input data, delta X with delta Y

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This is a huge update but I havent posted in a while

exotic lintel May 23, 2024, 5:16 AM

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still pebble

😲

still pebble May 28, 2024, 12:14 AM

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Need to fix some problem with my bootloader now...

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Getting a page fault

still pebble May 28, 2024, 12:57 AM

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Fixed! ||Surprised I fixed it faster than getting the limine talk||

still pebble May 28, 2024, 5:18 AM

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I could implement USB Mass storage devices along with the current HID in order to not require an installed hard drive

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Yeah I will probably do that

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Now that I will feed mouse data into usermode, I will repurpose the current keyboard data queue to be a general purpose event queue, with events being mouse, keyboard, etc

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Actually, instead of an event queue, I could do an event ring buffer

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So when hardware sends data, it will add an item to the ring buffer and advance a dequeue pointer, and then usermode processes can use a syscall to poll for events and advance the enqueue pointer

still pebble May 28, 2024, 10:47 AM

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Where is saalty #1 fan 😭

still pebble May 30, 2024, 7:06 AM

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Now I cleaned up the XHCI driver and I now have it pass HID data to the user mode processes cleanly

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Now I am trying to make it work on real hardware

still pebble May 30, 2024, 7:29 AM

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20 computer restarts in, sigh

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its lonely

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For some reason the driver freezes right when runstop bit is set.

still pebble May 30, 2024, 11:48 AM

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😭 I lost all my fans, all my followers

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Now I am just in an echo chamber

snow cloud May 30, 2024, 12:00 PM

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I'm here, and I added a star

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here, that is

still pebble May 30, 2024, 12:04 PM

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Thank you Tigran

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Debugging is more painful when I am lonely 😅

still pebble May 30, 2024, 3:08 PM

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Also, I pushed the latest changes to the Codeberg repository.

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I also will have to rewrite my memory allocator, it is a mess

still pebble May 31, 2024, 8:26 AM

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Maybe I have to properly de-initialize the firmware's XHCI data structures

worthy jasper Jun 3, 2024, 2:26 PM

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still pebble Where is saalty #1 fan 😭

idk where they went, but i'm here as well :3

still pebble Jun 3, 2024, 2:27 PM

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Ayyyyy!

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Welcome back

worthy jasper Jun 3, 2024, 2:28 PM

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well, welcome back to you too :P

still pebble Jun 3, 2024, 2:33 PM

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Yeah I was gone for a few months lol

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But I am happy to say my sine wave is at its peak!

worthy jasper Jun 3, 2024, 2:38 PM

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💪

snow cloud Jun 5, 2024, 8:57 PM

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Go go go saalty! We're rooting for you!!!!!!

worthy jasper Jun 6, 2024, 9:56 AM

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hell yeah saalty!

still pebble Jun 6, 2024, 10:56 AM

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Thanks guys!

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Right now I am stuck in a weird bug with calling my kernel main function

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There is a triple fault for some reason

still pebble Jun 6, 2024, 1:36 PM

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Was a bug with some macros, should be fixed now

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Yup, fixed

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Right now I am trying to get HPET working to make everything run more smoothly

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Looks like I did it

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Probably my most simple driver so far

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The OS boots smoothly now.

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Going to screen record it's current state.

still pebble Jun 6, 2024, 4:40 PM

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If only there was a cycle accurate x86_64 emulator with hardware virtualization...

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Then my job would be a lot easier

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But at the same time it would be extremely slow

still pebble Jun 6, 2024, 9:19 PM

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Also I will need to rework the paging to support higher addresses than 4GiB

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https://codeberg.org/thesalt/UnnamedOS

Codeberg.org

UnnamedOS

64-bit operating system

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Pushed my latest changes

bitter echo Jun 7, 2024, 7:45 AM

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nice to see another codeberg user

still pebble Jun 8, 2024, 8:03 PM

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bitter echo nice to see another codeberg user

Yeah, github is turning into too much of a shitshow for me to use it any longer.

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Aka microsoftification

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I was also considering Sourcehut, but it's too minimal for my personal tastes

still pebble Jun 8, 2024, 11:14 PM

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I am considering doing a full rewrite of the OS

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It feels like a skyscraper which has a foundation made of toothpicks, and if I make it offbalance it will crash down

proud pecan Jun 9, 2024, 5:20 PM

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still pebble It feels like a skyscraper which has a foundation made of toothpicks, and if I m...

so basically obos rewrite 4?

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anyway gl with the rewrite

sweet halo Jun 9, 2024, 7:20 PM

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still pebble Yeah, github is turning into too much of a shitshow for me to use it any longer.

Maybe gitlab?

still pebble Jun 10, 2024, 4:29 AM

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proud pecan anyway gl with the rewrite

thanks

still pebble Jun 10, 2024, 4:29 AM

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sweet halo Maybe gitlab?

idk, maybe

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I am thinking of making the rewrite be designed to be compatible with Windows

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Maybe there will be a combination of UNIX and NT design principles

proud pecan Jun 10, 2024, 4:35 PM

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Make working set model vmm

still pebble Jun 10, 2024, 6:25 PM

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proud pecan Make working set model vmm

what's that?

proud pecan Jun 10, 2024, 7:24 PM

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Search it

still pebble Jun 10, 2024, 7:50 PM

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well, online explanation of it is too vague

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And from what I have read so far it seems to be for memoey managers that swap pages

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I don't swap pages currently

proud pecan Jun 10, 2024, 11:30 PM

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basically

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it's the pages that should be loaded to minimize page faults (to load swapped pages)

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and maximize performance

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only a set amount of pages can be in it at once

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and it's limited by the working-set size

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first link [here](#virtual-memory message) is a paper on it

still pebble Jun 10, 2024, 11:45 PM

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thanks for the info!

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I guess me and ske will try to implement it once we have page swapping

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as right now we dont swap pages at all

proud pecan Jun 10, 2024, 11:46 PM

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I'm implementing it in OBOS

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and I'll probably add a swap along with it

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*swap interface

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the swap will probably just be some reserved ram region

still pebble Jun 10, 2024, 11:47 PM

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nice, i'll check out the obos thread once in a while to see your progress on it

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and to have a reference implementation for me to go off of I guess

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never swapped pages before so this will be something new

proud pecan Jun 10, 2024, 11:49 PM

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still pebble and to have a reference implementation for me to go off of I guess

check keyronex, @woeful rover's implementation would probably be better

proud pecan Jun 10, 2024, 11:49 PM

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still pebble never swapped pages before so this will be something new

In theory, it's simple

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you just turn off the present bit

still pebble Jun 10, 2024, 11:49 PM

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i know how to swap pages, i'm just worried about the implementation specific bugs I might encounter lol

proud pecan Jun 10, 2024, 11:49 PM

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maybe store some info about where the page is in swap

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then on page fault load in the page

still pebble Jun 10, 2024, 11:50 PM

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yeah

proud pecan Jun 10, 2024, 11:50 PM

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as for the working-set, in hindsight, it's simple, but the hard part is in how to determine its contents

still pebble Jun 10, 2024, 11:50 PM

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i guess the working set model attempts to minimize the amount of page swaps

proud pecan Jun 10, 2024, 11:51 PM

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still pebble i guess the working set model attempts to minimize the amount of page swaps

that's basically the entire point

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the working-set (maximum?) size is user-defined I guess

still pebble Jun 10, 2024, 11:51 PM

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i see

proud pecan Jun 10, 2024, 11:51 PM

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there are a couple algorithms for it

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one is in the paper

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some others can be found here

Page replacement algorithm

In a computer operating system that uses paging for virtual memory management, page replacement algorithms decide which memory pages to page out, sometimes called swap out, or write to disk, when a page of memory needs to be allocated. Page replacement happens when a requested page is not in memory (page fault) and a free page cannot be used to ...

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I plan on using the "aging" algorithm

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it's described in the paper somewhere, although I don't think it was really named that in the paper

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it had something to do with "used bits"

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as for how you'd know when to change said "used bits" (aka the age)

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you would basically make some timer

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(periodic timer)

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whenever it expires, I'm pretty sure you just loop over pages, checking the accessed and dirty bits in the pte

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oring the two bits

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and you'd also unset them

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then, you shift the value you got from adding them into the age

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then, to determine which ones are in the working-set, you or each bit in the age, whichever pages are zero, you don't put in the working-set

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and whatever ones are, you put in the working set

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now, I could be mistaken

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maybe I misunderstood something

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so if something I say is wrong, someone please correct me on it

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the reasons why this algorithm is good are described in the wikipedia page

proud pecan Jun 10, 2024, 11:59 PM

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proud pecan oring the two bits

maybe this part is wrong, or is different rather

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you could also check pages which have smallest age

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that could work too

proud pecan Jun 11, 2024, 12:06 AM

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proud pecan you could also check pages which have smallest age

*biggest

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you swap out pages with the smallest

still pebble Jun 11, 2024, 12:09 AM

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I will try to follow that article 😅

proud pecan Jun 11, 2024, 12:09 AM

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just ignore the math part of the paper

still pebble Jun 11, 2024, 12:10 AM

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I can probably set up HPET to run another periodic timer to do what you are describing

proud pecan Jun 11, 2024, 12:10 AM

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I did that and it worked out fine

still pebble Jun 11, 2024, 12:10 AM

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nice

proud pecan Jun 11, 2024, 12:10 AM

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proud pecan I did that and it worked out fine

as in

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ignore the math

proud pecan Jun 11, 2024, 12:11 AM

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still pebble I can probably set up HPET to run another periodic timer to do what you are desc...

That's (technically) what I'm planning to do'

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I've made a timer interface

still pebble Jun 11, 2024, 12:11 AM

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proud pecan ignore the math

Oh

proud pecan Jun 11, 2024, 12:12 AM

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proud pecan I've made a timer interface

for my kernel

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I made it because of the vmm though

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I'm done the outer layer

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I just need the hpet code

still pebble Jun 11, 2024, 12:12 AM

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Do you treat timer devices like drivers or are they seperate

proud pecan Jun 11, 2024, 12:13 AM

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the timer interface treats them as an abstract interface from the arch code

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which is basically what a driver is

proud pecan Jun 11, 2024, 12:14 AM

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proud pecan the timer interface treats them as an abstract interface from the arch code

well technically it tells the arch to initialize a timer with a frequency that the arch code chooses

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and the timer will be on some irq object initialized by the exteriour interface

still pebble Jun 17, 2024, 5:24 AM

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Unnamed OS development is probably going to end, in favor of an entirely new bootloader + kernel + OS designed ground up to look and function like Windows 10.

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I will talk with ske about this, but a clean rewrite would allow us to have a much cleaner and more modern bootloader and kernel

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If we end up going along with this new OS, we will probably make another thread in #1006498459798474873 for the new OS in order for people to be able to distinguish between this one and the new one.

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And if anyone feels sad about this, Unnamed OS walked so the new OS could run.

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One issue with the windows clone idea is copyright, and that will be tricky, but we will try our best to avoid using Microsoft's intellectual property

tight prawn Jun 17, 2024, 5:47 AM

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Windows clone in terms of GUI look or Abi and api?

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Why not help make reactos better in that case

still pebble Jun 17, 2024, 6:17 AM

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tight prawn Windows clone in terms of GUI look or Abi and api?

Both
I love ReactOS, and have been thinking of contributing to it, buuuut it's not Windows 10 compatible and not made by me 😄

tight prawn Jun 17, 2024, 7:43 AM

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Its not windows 10 compatible yet

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Because it’s an absolutely incredible amount of work

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You wont be windows 10 compatible even if you advertise yourself as windows 10

still pebble Jun 17, 2024, 7:58 AM

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You're right, I didn't think of the actual amount of work I would have to put in

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But that leaves me the question of where I want to go with osdev.

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At this point, I don't know what I want to make

tight prawn Jun 17, 2024, 8:06 AM

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I mean you can try

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Making your own react os

still pebble Jul 1, 2024, 6:52 AM

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Yo guys

bitter echo Jul 1, 2024, 6:53 AM

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yo salty

still pebble Jul 1, 2024, 6:53 AM

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Decided to not rewrite everything and just, y'know, keep working on this one

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Going to debug my USB driver on real hardware which is just as painful as it sounds

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I already have a bug on real hardware with USB...

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Also, how did you reply so fast r4

bitter echo Jul 1, 2024, 6:55 AM

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haha I happened to be looking at discord and it was an easy thing to type

still pebble Jul 1, 2024, 6:55 AM

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oh alright lol

bitter echo Jul 1, 2024, 6:55 AM

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good luck with your debugging 🙂

still pebble Jul 1, 2024, 6:57 AM

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Thanks, I will severely need it

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meanwhile js developers can just make a simple callback for a keypress... 😭

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function keyDown() my ass

worthy jasper Jul 2, 2024, 1:16 PM

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lmfao

stray latch Jul 8, 2024, 7:11 PM

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Yo salty any updates on the OS?

still pebble Jul 9, 2024, 2:57 AM

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stray latch Yo salty any updates on the OS?

Procrastination!

stray latch Jul 9, 2024, 2:58 AM

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YAY!

still pebble Jul 9, 2024, 2:58 AM

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Very awesome right?

stray latch Jul 9, 2024, 3:04 AM

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Yeah lol gn m8

still pebble Jul 30, 2024, 6:43 AM

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Getting motivation

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Primarily going to focus on USB again, to try and get it to a polished and stable state

worthy jasper Jul 30, 2024, 7:15 AM

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LETS FUCKING GO

still pebble Jul 30, 2024, 7:17 AM

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worthy jasper LETS FUCKING GO

Thats the spirit! After the USB driver, I will dedicate my effort to making a NIC driver...

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Will be pretty exciting

still pebble Jul 30, 2024, 11:20 AM

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One thing that I want in my OS is the ability for the user to modify programs even while they are running, so like inspecting their exact RAM and writing to a programs RAM at any time

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To allow this, I might add a command/syscall which would allow a root privilege user/program to "pause" a program's execution, unbeknownst to the program

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this way, the user has even more control of their computer, as it should be.

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Also will allow the user to inspect the CPU registers of the program's paused state

exotic lintel Jul 30, 2024, 11:39 AM

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still pebble One thing that I want in my OS is the ability for the user to modify programs ev...

like Cheat Engine?

still pebble Jul 30, 2024, 11:40 AM

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exotic lintel like Cheat Engine?

Cheat engine but its already in the system and probably more low-level inspecting options

slim edge Aug 1, 2024, 1:45 AM

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so a debugger?

sharp glade Aug 1, 2024, 1:52 AM

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LOL

slim edge Aug 1, 2024, 2:06 AM

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still pebble To allow this, I might add a command/syscall which would allow a root privilege ...

this already exists, see ptrace on linux

still pebble Aug 1, 2024, 2:10 AM

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good that it already exists

slim edge Aug 1, 2024, 2:11 AM

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just saying, the way you worded it makes it sound like a revolutionary feature

still pebble Aug 1, 2024, 2:11 AM

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I thought so at first, but then I remembered cheat engine and ptrace like you said

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Slightly disappointed that it already exists but whatever

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Well actually, cheat engine works by attaching itself to a process

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Cheat engine is probably easily detectable

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Not sure about ptrace though

slim edge Aug 1, 2024, 2:14 AM

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technically you can get the pid of the tracer process via procfs

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and there are obvious ways to detect that you've been blocked for a while

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like checking whether the time jumped forward by a large amount

still pebble Aug 1, 2024, 2:17 AM

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true

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Back to the drawing board

stray latch Aug 2, 2024, 5:29 AM

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POV you make it kernel mode and give them full memory control

still pebble Sep 8, 2024, 2:29 AM

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Guess who is back

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The USB driver is now more stable and has much better mouse support now

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The video showcases it

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The video shows the mouse stuttering quite a bit because of the software framebuffer blit lag, but without rendering its very smooth

still pebble Sep 8, 2024, 7:42 AM

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What's annoying is that my main OS is stored on my only nvme drive, so at the moment I cant test my OS on real hardware

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Guess I will have to move my main OS to an AHCI ssd

bitter echo Sep 8, 2024, 7:47 AM

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~~be brave, test your os on that drive~~

still pebble Sep 8, 2024, 7:57 AM

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bitter echo ~~be brave, test your os on that drive~~

well it would overwrite the GPT, as it doesnt base the OS installation on a partition but the entire drive

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perhaps I should add partitioning support later

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but its not really high priority

still pebble Sep 11, 2024, 1:18 PM

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USB keyboard works flawlessly now

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Together with USB mouse

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I think the USB driver is basically done now

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Which is huge

tight prawn Sep 11, 2024, 1:19 PM

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Which controller

still pebble Sep 11, 2024, 1:19 PM

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Too tired to record a video right now lol

still pebble Sep 11, 2024, 1:19 PM

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tight prawn Which controller

xhci

tight prawn Sep 11, 2024, 1:19 PM

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Real hid or boot?

still pebble Sep 11, 2024, 1:19 PM

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Real

tight prawn Sep 11, 2024, 1:19 PM

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Damn nice

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Did you test on real hw?

still pebble Sep 11, 2024, 1:20 PM

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thanks

still pebble Sep 11, 2024, 1:20 PM

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tight prawn Did you test on real hw?

I did, but there is issues. The main one being my motherboard has 3 fucking xhci's

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😭

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I have to rewrite my driver to support more than 1

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But shouldnt be too hard

tight prawn Sep 11, 2024, 1:20 PM

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still pebble I have to rewrite my driver to support more than 1

Huh

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How did you manage to not support that

still pebble Sep 11, 2024, 1:20 PM

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I might have been a little lazy

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But

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Should be a quick fix

tight prawn Sep 11, 2024, 1:21 PM

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Anyway saying its basically done without even testing real hw idk man

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Also try other emulators at least

still pebble Sep 11, 2024, 1:21 PM

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I know, I am going to test it on real hardware

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But at least on qemu it works (this doesnt mean much though from my experience 😭)

tight prawn Sep 11, 2024, 1:21 PM

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Yup

still pebble Sep 12, 2024, 4:55 AM

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Here, you can see the mouse drawing multicolor lines and me inputting text

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Both mouse and keyboard through USB, and storage is through NVMe

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Support for real hardware is definitely going to be worked on, but might take a while to get working

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I'll give updates for the status of it

still pebble Sep 12, 2024, 4:58 AM

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still pebble Support for real hardware is definitely going to be worked on, but might take a ...

Also, its just the USB driver that will have to get working on real hardware, NVMe and other stuff work fine

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So it shouldnt take too much work

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(famous last words)

bitter echo Sep 12, 2024, 6:48 AM

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nice one, thats cool

still pebble Dec 13, 2024, 1:55 AM

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The saalty is back

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And the latest update brings new features and optimizations to primarily the filesystem

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Most significantly, the filesystem now supports file sizes which arent aligned to 512

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The reason why this wasn't the case earlier, well, I wont answer that!

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Also fixed several memory leaks, and other poor memory management

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So the OS should be more stable than ever

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USB support on real hardware is still in the works though.

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The OS code also features a better interactive example of USB 3.0 keyboard and mouse

worthy jasper Dec 13, 2024, 11:55 AM

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YEAAAAAAAAAAAAAA

#saalty's unnamed OS