Built paging / the kernel's own page tables (with a TSS+IST)

src/main.zig

@@ -36,6 +36,7 @@ fn kmain(boot_info: *const BootInfo) noreturn {
     arch.init();
 
     con.write("danos: framebuffer console online\n");
+    con.write("danos: cpu tables online (GDT, IDT, TSS)\n");
     con.print("  resolution : {d}x{d}\n", .{ fb.width, fb.height });
     con.print("  pitch      : {d} bytes\n", .{fb.pitch});
     con.print("  format     : {s}\n", .{@tagName(fb.format)});
@@ -81,6 +82,11 @@ fn kmain(boot_info: *const BootInfo) noreturn {
     if (f2) |p| pmm.free(p);
     con.print("  after free : {d} frames free\n", .{pmm.stats().free_frames});
 
+    // Switch off the firmware's page tables onto our own.
+    arch.enablePaging(pmm.alloc);
+    con.print("\ndanos: paging enabled\n", .{});
+    con.print("  page tables: CR3 = 0x{x:0>16}\n", .{arch.readCr3()});
+
     con.write("\nkernel initialised; nothing left to do, halting.\n");
 
     arch.halt();