SEMU emulator | Operating System Development | Page 1

glad kindle Nov 13, 2023, 4:51 AM

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saalty x86 emulator, what more to say.

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hey guys

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saalty here

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this emulator will feature a lot of stuff hopefully

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I will post progress here

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Oh, and its also going to be x86_64

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I will have to sadly write an x86 instruction decoder

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this isnt as hard as I thought

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decoding the instructions at least, they are pretty nice

median snow Nov 13, 2023, 5:12 AM

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LET'S FUCKING GOOOOOO

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#1 saalty fan

glad kindle Nov 13, 2023, 5:12 AM

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never knew the day would come where people say they are my #1 fan lol

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thanks!

marble umbra Nov 13, 2023, 5:14 AM

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So its a box86 clone?

glad kindle Nov 13, 2023, 5:14 AM

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non, it is qemu-system-x86_64 clone

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well its a clone of any x86_64 computer

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thats the entire point lmao

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I am so smart

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lol

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i am proud of what I did here

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im still a dumbass though

marble umbra Nov 13, 2023, 5:17 AM

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C++ ???

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Why not C?

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I can see cuz there is no typedef

glad kindle Nov 13, 2023, 5:18 AM

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marble umbra Why not C?

i am too lazy too deal with C right now lol

marble umbra Nov 13, 2023, 5:18 AM

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Also why visual studio?

glad kindle Nov 13, 2023, 5:19 AM

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its a really nice IDE

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for windows at least

marble umbra Nov 13, 2023, 5:19 AM

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You thought I won't notice the color scheme

glad kindle Nov 13, 2023, 5:19 AM

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im not ashamed of using it

marble umbra Nov 13, 2023, 5:19 AM

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Its rally nice ig

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For c# and other ms shit that is

glad kindle Nov 13, 2023, 5:20 AM

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yeah, and has built in debugger which you dont have to pay 27$ for (looking at you, remedyBG)

marble umbra Nov 13, 2023, 5:21 AM

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I prefer vscode + make file + gdb for C

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Will it run on the unnamed OS?

glad kindle Nov 13, 2023, 5:22 AM

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me too, I love the linux way of doing things (was using gentoo for a while), but windows just feels much more user-friendly and pretty much all games run on it

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and you cant use gdb or make file in windows easily

glad kindle Nov 13, 2023, 5:22 AM

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marble umbra Will it run on the unnamed OS?

that is the goal

marble umbra Nov 13, 2023, 5:22 AM

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glad kindle me too, I love the linux way of doing things (was using gentoo for a while), but...

Games

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My solution was to only ever play Minecraft lul

median snow Nov 13, 2023, 5:23 AM

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glad kindle and you cant use gdb or make file in windows easily

wsl2?

glad kindle Nov 13, 2023, 5:23 AM

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marble umbra My solution was to only ever play Minecraft lul

all my favourite games are windows only sadly

glad kindle Nov 13, 2023, 5:24 AM

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median snow wsl2?

yeah I use wsl2 a lot, but you cant really do it with the VS ide

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maybe if this emulator gets good enough, I can replace qemu with it so that I would have full control over execution and debugging

marble umbra Nov 13, 2023, 5:26 AM

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Well , big dreams small yields

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(I just made that up lmao)

glad kindle Nov 13, 2023, 5:27 AM

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lol

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its true though, I should talk less and do more

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well, I will be in the vc to work on this emulator

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you guys can join if yall want

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for the FPU emulation, is it fine if I just use 64-bit floating point instead of 80-bit

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80 bit floating point seems tricky

marble umbra Nov 13, 2023, 5:36 AM

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Wait what

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X86 has 80 bit fpu???

marble umbra Nov 13, 2023, 5:37 AM

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glad kindle you guys can join if yall want

No one wants 😭

glad kindle Nov 13, 2023, 5:37 AM

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marble umbra X86 has 80 bit fpu???

yeah, 80-bit floating point

glad kindle Nov 13, 2023, 5:37 AM

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marble umbra No one wants 😭

bruh 😭

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anything I am missing in the CPU struct?

marble umbra Nov 13, 2023, 5:58 AM

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Ram should not be there

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Instead, use a BUS struct

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Maybe pointers for the specific pins

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And aren't gdtr ldtr and idtr nonstandard?

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Like they have most re bits

marble umbra Nov 13, 2023, 6:00 AM

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glad kindle anything I am missing in the CPU struct?

That's all

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Oh, forgot about the numbered registers

glad kindle Nov 13, 2023, 6:04 AM

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marble umbra Instead, use a BUS struct

let all be honest here, who will need or want more than 1 ram. might as well just hard code it

glad kindle Nov 13, 2023, 6:06 AM

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marble umbra And aren't gdtr ldtr and idtr nonstandard?

the way its implemented isnt that important

marble umbra Nov 13, 2023, 6:07 AM

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glad kindle let all be honest here, who will need or want more than 1 ram. might as well jus...

You forgot about mmio

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Oh, also the IO bus

marble umbra Nov 13, 2023, 6:09 AM

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glad kindle the way its implemented isnt that important

I mean they have more bits than 64

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64 for addr and 16 for size?

glad kindle Nov 13, 2023, 6:12 AM

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marble umbra You forgot about mmio

there is nothing mmio-specific that needs to be in cpu struct

glad kindle Nov 13, 2023, 6:13 AM

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marble umbra Oh, also the IO bus

I forgot yeah

glad kindle Nov 13, 2023, 6:14 AM

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marble umbra 64 for addr and 16 for size?

oh and you are right I forgot

sacred cipher Nov 13, 2023, 6:54 AM

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marble umbra I can see cuz there is no typedef

the typedef could be above

glad kindle Nov 14, 2023, 12:57 AM

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will start working on this again pretty soon

glad kindle Nov 14, 2023, 3:01 AM

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alright, started work on the instruction decoder

glass nebula Nov 14, 2023, 3:54 AM

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glad kindle

hidden parts of segment registers?

glad kindle Nov 14, 2023, 4:39 AM

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glass nebula hidden parts of segment registers?

they have hidden parts?

glass nebula Nov 14, 2023, 4:40 AM

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loading a value into the selector register also loads the hidden parts from the gdt

glad kindle Nov 14, 2023, 4:40 AM

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also - does anyone know where I can find different instructions opcode definitions

glass nebula Nov 14, 2023, 4:40 AM

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then as long as the selector doesnt change the gdt is not touched

glad kindle Nov 14, 2023, 4:41 AM

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glass nebula loading a value into the selector register also loads the hidden parts from the ...

oh i see, I never knew that

glass nebula Nov 14, 2023, 4:41 AM

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the hidden parts are all the segment params from the gdt, so the base, limit etc

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the sdm has more details most likely

glad kindle Nov 14, 2023, 4:43 AM

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alright, I will have to read up on that too then

marble umbra Nov 22, 2023, 5:05 AM

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Updates?

marble umbra Nov 23, 2023, 7:26 PM

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Ded

glad kindle Nov 24, 2023, 4:56 AM

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Will come back to this soon

glad kindle Apr 5, 2024, 6:31 PM

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This project, may not be dead. I have recently made an x86 dynamic instruction encoder, so I will return to this probably.

#SEMU emulator