Move to multi arch support and added memory map

build.zig

@@ -11,6 +11,13 @@ pub fn build(b: *std.Build) void {
         .root_source_file = b.path("src/root.zig"),
     });
 
+    // Architecture-specific kernel code (CPU ops, entry, later GDT/IDT/paging).
+    // The generic kernel imports this as "arch" and never names x86_64, so a new
+    // architecture is a matter of pointing this module at a different directory.
+    const arch_mod = b.addModule("arch", .{
+        .root_source_file = b.path("src/arch/x86_64/cpu.zig"),
+    });
+
     // --- Kernel: freestanding x86_64 ELF, jumped to by the bootloader ---
     // SSE2 is part of the x86_64 baseline and UEFI leaves it enabled at handoff,
     // so we keep it: disabling it forces soft-float and makes the compiler unable
@@ -35,10 +42,11 @@ pub fn build(b: *std.Build) void {
             .stack_protector = false,
             .imports = &.{
                 .{ .name = "danos", .module = mod },
+                .{ .name = "arch", .module = arch_mod },
             },
         }),
     });
-    exe.setLinkerScript(b.path("src/linker.ld"));
+    exe.setLinkerScript(b.path("src/arch/x86_64/linker.ld"));
     exe.entry = .{ .symbol_name = "_start" };
     // Physical address the bootloader loads the kernel to (identity-mapped under
     // UEFI). Overrides Zig's default image base so the linker script's layout is