Dump the memory map from limine.

Also adds the ability to print formatted messages.

zion/boot/boot_info.cpp

@@ -0,0 +1,28 @@
+#include "boot/boot_info.h"
+
+#include "debug/debug.h"
+
+namespace boot {
+static volatile struct limine_memmap_request gMemmapRequest {
+  .id = LIMINE_MEMMAP_REQUEST, .revision = 0, .response = 0,
+};
+
+const limine_memmap_response& GetMemoryMap() {
+  if (!gMemmapRequest.response) {
+    panic("No memmap from limine.");
+  }
+  return *gMemmapRequest.response;
+}
+
+static volatile struct limine_hhdm_request gHhdmRequest {
+  .id = LIMINE_HHDM_REQUEST, .revision = 0, .response = 0,
+};
+
+uint64_t GetHigherHalfDirectMap() {
+  if (!gHhdmRequest.response) {
+    panic("No HHDM response from limine.");
+  }
+  return gHhdmRequest.response->offset;
+}
+
+}  // namespace boot