Microkernel thing OS experiment (Zig ⚡)
pci.express
1const std = @import("std");
2const os = @import("os.zig");
3const config = @import("config");
4
5export fn _start() callconv(.c) noreturn {
6 _ = os.syscall1(SYS_poke, 0xB16B00B5BADBABE);
7 _ = os.syscall1(SYS_exit, 0x69696969);
8 asm volatile ("int3");
9 asm volatile (
10 \\ mov %[number], %%rdi
11 \\ xor %%rsi, %%rsi
12 \\ xor %%rbx, %%rbx
13 \\ mainloop:
14 \\ xor %%rax, %%rax
15 \\ delayloop:
16 \\ inc %%rax
17 \\ cmp $0x1000000, %%rax
18 \\ jnz delayloop
19 \\ inc %%rbx
20 \\ mov %%rsp, %%rsi
21 \\ syscall
22 \\ jmp mainloop
23 :
24 : [number] "r" (config.number),
25 );
26
27 die();
28}
29
30pub inline fn die() noreturn {
31 while (true) {}
32}
33
34pub const SYS_exit = 0x420;
35pub const SYS_poke = 0x69;