feat(loader, kernel): impl part of loader and initialize kernel structure

kernel/build.zig

@@ -1,32 +0,0 @@
-const std = @import("std");
-
-pub fn buildKernelBin(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *std.Build.Step.Compile {
-    const kernel = b.addExecutable(.{
-        .name = "kernel.bin",
-        .use_llvm = true,
-        .use_lld = true,
-        .root_module = b.createModule(.{
-            .root_source_file = b.path("init/main.zig"),
-            .target = target,
-            .optimize = optimize,
-            .code_model = .kernel,
-        }),
-    });
-    switch (target.result.cpu.arch) {
-        .x86_64 => {
-            kernel.setLinkerScript(b.path("arch/x86/kernel_bin.ld"));
-        },
-        else => {
-            @panic("target architecture unsupported");
-        }
-    }
-    kernel.entry = .{
-        .symbol_name = "kernel_start",
-    };
-    kernel.link_gc_sections = false;
-    return kernel;
-}
-
-pub fn buildKernelBinInstall(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *std.Build.Step.InstallArtifact {
-    return b.addInstallArtifact(buildKernelBin(b, target, optimize), .{});
-}

kernel/main.zig

@@ -0,0 +1,4 @@
+export fn start_kernel() callconv(.c) noreturn {
+    // Placeholder for kernel start function
+    while (true) {}
+}