Initial commit

src/main.zig

@@ -0,0 +1,89 @@
+const lazy = @import("utils/Lazy.zig").lazy;
+const Console = @import("Console.zig");
+
+const ALIGN = 1 << 0;
+const MEMINFO = 1 << 1;
+const MAGIC = 0x1BADB002;
+const FLAGS = ALIGN | MEMINFO;
+
+const MultibootHeader = packed struct {
+    magic: i32 = MAGIC,
+    flags: i32,
+    checksum: i32,
+    padding: u32 = 0,
+};
+
+export var mutliboot: MultibootHeader align(4) linksection(".multiboot") = .{
+    .flags = FLAGS,
+    .checksum = -(MAGIC + FLAGS),
+};
+
+var stack_bytes: [16 * 1024]u8 align(16) linksection(".bss") = undefined;
+
+export fn _start() callconv(.Naked) noreturn {
+    asm volatile (
+        \\ movl %[stack_top], %%esp
+        \\ movl %%esp, %%ebp
+        \\ call %[kmain:P]
+        :
+        : [stack_top] "i" (@as([*]align(16) u8, @ptrCast(&stack_bytes)) + @sizeOf(@TypeOf(stack_bytes))),
+          [kmain] "X" (&kmain),
+    );
+}
+
+var console = lazy(Console, .init);
+
+fn kmain() callconv(.C) void {
+    std.log.info("This is an info message", .{});
+    std.log.debug("This is a debug message!", .{});
+    std.log.warn("This is a warning message!", .{});
+    std.log.err("This is an error message!", .{});
+
+    @panic("Uh oh");
+}
+
+const std = @import("std");
+
+pub const panic = std.debug.FullPanic(kpanic);
+
+fn kpanic(msg: []const u8, first_trace_addr: ?usize) noreturn {
+    _ = first_trace_addr;
+
+    std.log.err("PANIC: {s}", .{msg});
+
+    while (true) {}
+}
+
+pub const std_options = std.Options{
+    .log_level = .debug,
+    .logFn = klog,
+};
+
+fn klog(
+    comptime level: std.log.Level,
+    comptime scope: @Type(.enum_literal),
+    comptime format: []const u8,
+    args: anytype,
+) void {
+    const c = console.get();
+
+    const color = switch (level) {
+        .err => Console.ConsoleColor.lightRed,
+        .warn => Console.ConsoleColor.lightBrown,
+        .info => Console.ConsoleColor.lightBlue,
+        .debug => Console.ConsoleColor.lightGreen,
+    };
+    c.putChar('[');
+    c.setColor(color, Console.ConsoleColor.black);
+    c.puts(level.asText());
+    c.resetColor();
+    c.putChar(']');
+
+    c.putChar(' ');
+
+    c.puts("(" ++ @tagName(scope) ++ ")");
+
+    c.putChar(' ');
+
+    c.printf(format ++ "\n", args);
+}