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|
||||
[[package]] |
||||
name = "xml-rs" |
||||
version = "0.8.4" |
||||
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3" |
||||
@ -0,0 +1,10 @@ |
||||
[package] |
||||
name = "side" |
||||
version = "0.1.0" |
||||
edition = "2018" |
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html |
||||
|
||||
[dependencies] |
||||
minifb = "0.19.3" |
||||
font8x8 = "0.3.1" |
||||
@ -0,0 +1,178 @@ |
||||
# Philosophy of Boo OS |
||||
|
||||
> Operating System: An operating system is a collection of things that don't fit into a language. There shouldn't be one. - [Design Principles Behind Smalltalk](https://www.cs.virginia.edu/~evans/cs655/readings/smalltalk.html) |
||||
|
||||
Boo OS is a meditation on recursive complexity and the curse of simplicity. In an age where computers are so powerful, it is sometimes healing to start again. |
||||
|
||||
I have often been stuck between my desire to build either an operating system, a shell, a language or an ide. None |
||||
of those categories ever quite fit the hole I was intending them to fill. |
||||
|
||||
After much introspection and research I finally decided that what I really needed was something different. |
||||
|
||||
Inspired by smalltalk, Boo OS is "image" based, the entire system can be dumped and reloaded to the same state. |
||||
|
||||
Eventually my plan is that Boo OS contain all the essentials necessary for **self modification**. It should be possible to (safely) modify the operating system from within the operating system and have the changes take effect. |
||||
|
||||
How that will look is undecided. For now, Boo OS is coded entirely in Boo Bytecode Assembly Language and assembled |
||||
using a Rust based assembler. One of my first targets for a real application is an Assembler written in Boo Bytecode, |
||||
run on BooOS and outputting a Boo Bytecode image. |
||||
|
||||
## BooVM |
||||
|
||||
Boo OS is written in Boo Bytecode which is run by the Boo Virtual Machine (BooVM). BooVM and Boo Bytecode is inspired |
||||
by various retro computing architectures with minimal instructions, but a focus on integrating with the core |
||||
systems. |
||||
|
||||
As such. the BooVM offers minimal integration with the outside world. Interaction is limited to: |
||||
|
||||
- Reading and Writing BooVM images to/from the Host OS |
||||
- Exposing The State of the Keyboard and Mouse |
||||
- Offering a Framebuffer for Display Output |
||||
- (Provisional) Reading and Writing "Files" from the Host OS OR Loading and Interacting with a generalized |
||||
File System that can be loaded by both operating systems (i.e. some kind of virtual disk image) |
||||
|
||||
### Why Write a Custom VM? |
||||
|
||||
Why Not? This is a meditation on recursive complexity. I was already set on writing a new language and building one from the ground up on a custom instruction set seemed like a great idea. |
||||
|
||||
The longer version is that I looked into many options for the base of this project. They fell into |
||||
two main categories: |
||||
|
||||
The first featured existing ISA emulations (e.g. QEMU) and existing production ready language virtual machines (e.g. JVM, Lua) - I decided that using an existing architecture wasn't in the spirit of the project. Further, both of these options |
||||
would require extra work to integrate a framebuffer display and input up to the extent where I would be writing an OS |
||||
for an existing architecture. I wanted to keep the wrapping interface to the host OS as simple as possible. |
||||
|
||||
The second category featured older reto architectures, emulators and the like. I rejected this approach because |
||||
there are some details I don't want to care about, like scanlines and cartridge layouts. This approach would also |
||||
make interaction with the Host OS a project in itself likely requiring forking and significant rework resulting in |
||||
a custom emulator any way. |
||||
|
||||
After research, designing and implementing an assembler for some custom bytecode and building a small VM to run |
||||
it seemed to be the simplest option and provides me with a lot of freedom moving forward, and lends itself to |
||||
infinite experimentation. |
||||
|
||||
## TODO List |
||||
|
||||
The below represents some ideas for projects to tackle within Boo OS. |
||||
|
||||
- [x] Print Strings to the FrameBuffer |
||||
- [x] Set Framebuffer Position Helper Function |
||||
- [x] `put_char` Helper Function |
||||
- [ ] Memory Management |
||||
- [ ] Heap Design |
||||
- [ ] Implement Helper Functions `alloc` and `free` |
||||
- [ ] Memory Safety |
||||
- [ ] Keyboard Input |
||||
- [ ] Designing Input Interaction (poll v.s. interrupts) |
||||
- [ ] Create a Console Shell to Interact with the System |
||||
- [ ] At first this shell will be limited to pre-programmed commands |
||||
- [ ] But, it should quickly all the construction of new commands from old ones |
||||
- [ ] Finally, the shell should facilitate saving and loading of images |
||||
- [ ] Write a Bootstrapped Assembler Application in Boo Bytecode Assembly |
||||
|
||||
|
||||
|
||||
# Formal Reqs |
||||
|
||||
|
||||
Run time: |
||||
- Memory needs R/W/E flags - 3 bits |
||||
- Mapping Memory before handing off to lesser privileged processes |
||||
- Needs some understanding off operating mode |
||||
|
||||
|
||||
- Never attempt to pop an empty stack |
||||
|
||||
|
||||
|
||||
Memory |
||||
|
||||
We treat each 64 chunks of memory as a single page: |
||||
|
||||
0x0000 4800 Pages of Write only Display Memory |
||||
0x4B000 1 Page of Registers [rip, mode, display, rax, r2, r3, r4, r5, r6, r7, r8] |
||||
0x4B040 1 Page of Call Stack |
||||
0x4B080 1 Page of Input Flags (Keys Down etc) |
||||
0x4B0C0 Dynamic Memory Begins |
||||
|
||||
|
||||
## Instructions |
||||
|
||||
All instructions are fixed length. |
||||
|
||||
|
||||
## Meta Instructions |
||||
|
||||
0x00 - Nop |
||||
0x01 - Update Display |
||||
0x0F - HLT |
||||
|
||||
## Dynamic Instructions |
||||
|
||||
Prefix 0x1#,0x2#,0x3# are given to dynamin register based commands |
||||
|
||||
- 0x1n STORE(n) $Addr (R(n)) -> Addr) |
||||
- 0x2n LOAD(n) $Addr (Addr -> R(n)) |
||||
- 0x3n LOADI(n) IMM (Immediate -> R(n)) |
||||
- 0x4n INC(n) |
||||
- 0x5n DEC(n) |
||||
- 0x6n ISTORE(n) |
||||
- 0x7n x LDSTORE Load the Address Stored in n into reg(x) |
||||
- 0x8n x Transfer R(n) to R(x) |
||||
|
||||
|
||||
- 0x9n Shift |
||||
|
||||
## Arithmetic |
||||
|
||||
Prefix 0xa# is given to arithmetic functions |
||||
|
||||
- 0xa1 ADD (R2 + R3 -> RAX) |
||||
- 0xa2 SUB (R2 - R3 -> RAX) |
||||
- 0xa3 MUL (R2 * R3 -> RAX) |
||||
- 0xa4 DIV (R2 / R3 -> RAX) |
||||
- 0xa5 SHIFT (R2 >> R3 -> RAX) |
||||
- 0xa6 AND (R2 & R3 -> RAX) |
||||
|
||||
|
||||
# Stack |
||||
|
||||
Prefix 0xc# allows call stack manipulation. The machine denotes 64 memory addresses at memoo |
||||
|
||||
- 0xc0 RET |
||||
- 0xc1 PUSH Call Stack |
||||
|
||||
# Jumps and Branches (0x5#) |
||||
|
||||
- 0xE0 JMP $Addr - Unconditional jump to $Addr |
||||
- 0xE1 JMPEQ $Addr (if R1 == R2 jmp $Addr else ) |
||||
- 0xE2 JMPNEQ $Addr (if R1 != R2 jmp $Addr else ) |
||||
- 0xE3 JMPGT $Addr (if R1 > R2 jmp $Addr else ) |
||||
- 0xE4 JMPLT $Addr (if R1 < R2 jmp $Addr else ) |
||||
- 0xE5 JMPGEQ $Addr (if R1 >= R2 jmp $Addr else ) |
||||
- 0xE6 JMPLEQ $Addr (if R1 <= R2 jmp $Addr else ) |
||||
|
||||
## Admin Mode Instructions |
||||
|
||||
Instructions prefixed with 0xF are admin instructions |
||||
|
||||
- 0xF0 UNSET_R $Addr (Sets the 64 addresses after $Addr as Not Readable) |
||||
- 0xF1 SET_R $Addr (Sets the 64 addresses after $Addr as Readable) |
||||
|
||||
- 0xF2 UNSET_W $Addr (Sets the 64 addresses after $Addr as Not Writable) |
||||
- 0xF3 SET_W $Addr (Sets the 64 addresses after $Addr as Writable) |
||||
|
||||
- 0xF4 UNSET_X $Addr (Sets the 64 addresses after $Addr as Not Executable) |
||||
- 0xF5 SET_X $Addr (Sets the 64 addresses after $Addr as Executable) |
||||
|
||||
- 0xFF DROP_MODE $Addr - Drops from Admin Mode into User Mode (No access to Admin mode instructions) |
||||
|
||||
|
||||
|
||||
0: LOAD_IMM 10 |
||||
1: NOP |
||||
2: DEC(1) |
||||
3: JNEQ |
||||
|
||||
|
||||
## |
||||
@ -0,0 +1,290 @@ |
||||
label char_space: |
||||
$00000000 |
||||
$00000000 |
||||
label char_!: |
||||
$183c3c18 |
||||
$18001800 |
||||
label char_": |
||||
$36360000 |
||||
$00000000 |
||||
label char_#: |
||||
$36367f36 |
||||
$7f363600 |
||||
label char_$: |
||||
$0c3e031e |
||||
$301f0c00 |
||||
label char_%: |
||||
$00633318 |
||||
$0c666300 |
||||
label char_&: |
||||
$1c361c6e |
||||
$3b336e00 |
||||
label char_': |
||||
$06060300 |
||||
$00000000 |
||||
label char_(: |
||||
$180c0606 |
||||
$060c1800 |
||||
label char_): |
||||
$060c1818 |
||||
$180c0600 |
||||
label char_*: |
||||
$00663cff |
||||
$3c660000 |
||||
label char_+: |
||||
$000c0c3f |
||||
$0c0c0000 |
||||
label char_,: |
||||
$00000000 |
||||
$000c0c06 |
||||
label char_-: |
||||
$0000003f |
||||
$00000000 |
||||
label char_.: |
||||
$00000000 |
||||
$000c0c00 |
||||
label char_/: |
||||
$6030180c |
||||
$06030100 |
||||
label char_0: |
||||
$3e63737b |
||||
$6f673e00 |
||||
label char_1: |
||||
$0c0e0c0c |
||||
$0c0c3f00 |
||||
label char_2: |
||||
$1e33301c |
||||
$06333f00 |
||||
label char_3: |
||||
$1e33301c |
||||
$30331e00 |
||||
label char_4: |
||||
$383c3633 |
||||
$7f307800 |
||||
label char_5: |
||||
$3f031f30 |
||||
$30331e00 |
||||
label char_6: |
||||
$1c06031f |
||||
$33331e00 |
||||
label char_7: |
||||
$3f333018 |
||||
$0c0c0c00 |
||||
label char_8: |
||||
$1e33331e |
||||
$33331e00 |
||||
label char_9: |
||||
$1e33333e |
||||
$30180e00 |
||||
label char_:: |
||||
$000c0c00 |
||||
$000c0c00 |
||||
label char_;: |
||||
$000c0c00 |
||||
$000c0c06 |
||||
label char_<: |
||||
$180c0603 |
||||
$060c1800 |
||||
label char_=: |
||||
$00003f00 |
||||
$003f0000 |
||||
label char_>: |
||||
$060c1830 |
||||
$180c0600 |
||||
label char_?: |
||||
$1e333018 |
||||
$0c000c00 |
||||
label char_@: |
||||
$3e637b7b |
||||
$7b031e00 |
||||
label char_A: |
||||
$0c1e3333 |
||||
$3f333300 |
||||
label char_B: |
||||
$3f66663e |
||||
$66663f00 |
||||
label char_C: |
||||
$3c660303 |
||||
$03663c00 |
||||
label char_D: |
||||
$1f366666 |
||||
$66361f00 |
||||
label char_E: |
||||
$7f46161e |
||||
$16467f00 |
||||
label char_F: |
||||
$7f46161e |
||||
$16060f00 |
||||
label char_G: |
||||
$3c660303 |
||||
$73667c00 |
||||
label char_H: |
||||
$3333333f |
||||
$33333300 |
||||
label char_I: |
||||
$1e0c0c0c |
||||
$0c0c1e00 |
||||
label char_J: |
||||
$78303030 |
||||
$33331e00 |
||||
label char_K: |
||||
$6766361e |
||||
$36666700 |
||||
label char_L: |
||||
$0f060606 |
||||
$46667f00 |
||||
label char_M: |
||||
$63777f7f |
||||
$6b636300 |
||||
label char_N: |
||||
$63676f7b |
||||
$73636300 |
||||
label char_O: |
||||
$1c366363 |
||||
$63361c00 |
||||
label char_P: |
||||
$3f66663e |
||||
$06060f00 |
||||
label char_Q: |
||||
$1e333333 |
||||
$3b1e3800 |
||||
label char_R: |
||||
$3f66663e |
||||
$36666700 |
||||
label char_S: |
||||
$1e33070e |
||||
$38331e00 |
||||
label char_T: |
||||
$3f2d0c0c |
||||
$0c0c1e00 |
||||
label char_U: |
||||
$33333333 |
||||
$33333f00 |
||||
label char_V: |
||||
$33333333 |
||||
$331e0c00 |
||||
label char_W: |
||||
$6363636b |
||||
$7f776300 |
||||
label char_X: |
||||
$6363361c |
||||
$1c366300 |
||||
label char_Y: |
||||
$3333331e |
||||
$0c0c1e00 |
||||
label char_Z: |
||||
$7f633118 |
||||
$4c667f00 |
||||
label char_[: |
||||
$1e060606 |
||||
$06061e00 |
||||
label char_\: |
||||
$03060c18 |
||||
$30604000 |
||||
label char_]: |
||||
$1e181818 |
||||
$18181e00 |
||||
label char_^: |
||||
$081c3663 |
||||
$00000000 |
||||
label char__: |
||||
$00000000 |
||||
$000000ff |
||||
label char_`: |
||||
$0c0c1800 |
||||
$00000000 |
||||
label char_a: |
||||
$00001e30 |
||||
$3e336e00 |
||||
label char_b: |
||||
$0706063e |
||||
$66663b00 |
||||
label char_c: |
||||
$00001e33 |
||||
$03331e00 |
||||
label char_d: |
||||
$3830303e |
||||
$33336e00 |
||||
label char_e: |
||||
$00001e33 |
||||
$3f031e00 |
||||
label char_f: |
||||
$1c36060f |
||||
$06060f00 |
||||
label char_g: |
||||
$00006e33 |
||||
$333e301f |
||||
label char_h: |
||||
$0706366e |
||||
$66666700 |
||||
label char_i: |
||||
$0c000e0c |
||||
$0c0c1e00 |
||||
label char_j: |
||||
$30003030 |
||||
$3033331e |
||||
label char_k: |
||||
$07066636 |
||||
$1e366700 |
||||
label char_l: |
||||
$0e0c0c0c |
||||
$0c0c1e00 |
||||
label char_m: |
||||
$0000337f |
||||
$7f6b6300 |
||||
label char_n: |
||||
$00001f33 |
||||
$33333300 |
||||
label char_o: |
||||
$00001e33 |
||||
$33331e00 |
||||
label char_p: |
||||
$00003b66 |
||||
$663e060f |
||||
label char_q: |
||||
$00006e33 |
||||
$333e3078 |
||||
label char_r: |
||||
$00003b6e |
||||
$66060f00 |
||||
label char_s: |
||||
$00003e03 |
||||
$1e301f00 |
||||
label char_t: |
||||
$080c3e0c |
||||
$0c2c1800 |
||||
label char_u: |
||||
$00003333 |
||||
$33336e00 |
||||
label char_v: |
||||
$00003333 |
||||
$331e0c00 |
||||
label char_w: |
||||
$0000636b |
||||
$7f7f3600 |
||||
label char_x: |
||||
$00006336 |
||||
$1c366300 |
||||
label char_y: |
||||
$00003333 |
||||
$333e301f |
||||
label char_z: |
||||
$00003f19 |
||||
$0c263f00 |
||||
label char_{: |
||||
$380c0c07 |
||||
$0c0c3800 |
||||
label char_|: |
||||
$18181800 |
||||
$18181800 |
||||
label char_}: |
||||
$070c0c38 |
||||
$0c0c0700 |
||||
label char_~: |
||||
$6e3b0000 |
||||
$00000000 |
||||
label char_delete: |
||||
$00000000 |
||||
$00000000 |
||||
|
||||
data ascii HEX_TABLE 0123456789ABCDEF |
||||
@ -0,0 +1,5 @@ |
||||
label set_pos: |
||||
loadi 2 $280 |
||||
mul $2 $A $2 ; Mul Y * 640 |
||||
add $2 $9 $B ; + X = VBUF POS |
||||
ret |
||||
@ -0,0 +1,71 @@ |
||||
@ $00000: |
||||
label vbuf: |
||||
|
||||
@ $4B000: |
||||
$5B000 ; Set Instruction Pointer to $5B000 |
||||
label RAX: |
||||
$0000000 ; RAX |
||||
$0000000 ; R2 - Temp Scratch |
||||
$0000000 ; R3 - Temp Scratch |
||||
$0000000 ; R4 - ARG 1 |
||||
$0000000 ; R5 - ARG 2 |
||||
$0000000 ; R6 - ARG 3 |
||||
$0000000 ; R7 - ARG 4 |
||||
$0000000 ; R8 - ARG 5 |
||||
$0000000 ; RX |
||||
$0000000 ; RY |
||||
$0000000 ; RVBUF (RY * 640) + RX |
||||
|
||||
@ $4B0C0: |
||||
|
||||
import display.asm |
||||
import charset.asm |
||||
import strings.asm |
||||
import util.asm |
||||
|
||||
; Common Strings |
||||
data ascii HelloWorld Welcome to Boo OS Running on Boo Byte Code! |
||||
data ascii Welcome !@#$%^&*()_+=-0987654321 |
||||
data ascii Introspection We Can Now Do Introspection: |
||||
data ascii label_rax RAX: |
||||
data ascii label_rip RIP: |
||||
data ascii label_cycles Instruction Count: |
||||
|
||||
|
||||
; Kernel Begins |
||||
@ $5B000: |
||||
loadi $9 1; |
||||
loadi $A 1; |
||||
call set_pos |
||||
|
||||
loadi $4 HelloWorld |
||||
call draw_string; |
||||
|
||||
loadi $9 1; |
||||
loadi $A 10; |
||||
call set_pos |
||||
|
||||
loadi $4 Welcome |
||||
call draw_string; |
||||
|
||||
; OK! Time for some self referencing!! |
||||
loadi $9 1; |
||||
loadi $A 20; |
||||
call set_pos |
||||
|
||||
loadi $4 Introspection |
||||
call draw_string; |
||||
|
||||
loadi $9 1; |
||||
loadi $A 30; |
||||
call set_pos |
||||
|
||||
loadi $4 label_cycles |
||||
call draw_string; |
||||
|
||||
loadi $4 $4B000 |
||||
loadi $2 $40 |
||||
add $2 $4 $4 |
||||
call print_addr |
||||
updsp |
||||
jmp $5B000; |
||||
@ -0,0 +1,280 @@ |
||||
use crate::{Machine, MEMORY}; |
||||
use std::collections::HashMap; |
||||
use std::fs::read_to_string; |
||||
|
||||
pub struct ImageAssembler { |
||||
memory: [u32; MEMORY], |
||||
ptr: usize, |
||||
labels: HashMap<String, usize>, |
||||
} |
||||
|
||||
impl ImageAssembler { |
||||
pub fn new() -> ImageAssembler { |
||||
ImageAssembler { |
||||
memory: [0; MEMORY], |
||||
ptr: 0, |
||||
labels: HashMap::new(), |
||||
} |
||||
} |
||||
|
||||
pub fn extract(self) -> Machine { |
||||
let mut machine = Machine::new(); |
||||
machine.memory = self.memory; |
||||
return machine; |
||||
} |
||||
|
||||
pub fn assemble(&mut self, filename: &str) { |
||||
let asm = read_to_string(filename).unwrap_or_default(); |
||||
let lines = asm.split('\n'); |
||||
for line in lines { |
||||
let parts = line.split_once(';'); |
||||
|
||||
let command = match parts { |
||||
Some((command, _comment)) => command.trim(), |
||||
_ => line.trim(), |
||||
}; |
||||
|
||||
let command_parts = command.split_whitespace().collect::<Vec<&str>>(); |
||||
|
||||
if command_parts.is_empty() { |
||||
continue; |
||||
} |
||||
|
||||
if command_parts.len() == 1 { |
||||
match command_parts[0] { |
||||
"nop" => { |
||||
self.memory[self.ptr] = 0x00000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
"ret" => { |
||||
self.memory[self.ptr] = 0xC0000000; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
self.ptr += 1; |
||||
} |
||||
"hlt" => { |
||||
self.memory[self.ptr] = 0x0F000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
"inc1" => { |
||||
self.memory[self.ptr] = 0x41000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
"inc2" => { |
||||
self.memory[self.ptr] = 0x42000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
"inc3" => { |
||||
self.memory[self.ptr] = 0x43000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
"updsp" => { |
||||
self.memory[self.ptr] = 0x01000000; |
||||
self.ptr += 1; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
} |
||||
_ => { |
||||
let data = self.parse_addr(command_parts[0]); |
||||
self.memory[self.ptr] = data; |
||||
self.ptr += 1; |
||||
} |
||||
} |
||||
} else if command_parts.len() == 2 && command_parts[0] != "data" { |
||||
match command_parts[0] { |
||||
"label" => { |
||||
self.labels |
||||
.insert(command_parts[1].replace(":", ""), self.ptr); |
||||
} |
||||
"@" => { |
||||
self.ptr = self.parse_addr(command_parts[1]) as usize; |
||||
println!("Setting addr to ${:X}", self.ptr); |
||||
} |
||||
"inc" => { |
||||
let num = self.parse_addr(command_parts[1]); |
||||
let inst = 0x40 + num; |
||||
self.memory[self.ptr] = inst << 24; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
self.ptr += 1; |
||||
} |
||||
"dec" => { |
||||
let num = self.parse_addr(command_parts[1]); |
||||
let inst = 0x50 + num; |
||||
self.memory[self.ptr] = inst << 24; |
||||
println!("{:X}: {:X}", self.ptr, self.memory[self.ptr]); |
||||
self.ptr += 1; |
||||
} |
||||