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diff --git a/src/threads/loader.h b/src/threads/loader.h
new file mode 100644
index 0000000..2aebb0f
--- /dev/null
+++ b/src/threads/loader.h
@@ -0,0 +1,22 @@
+#ifndef HEADER_LOADER_H
+#define HEADER_LOADER_H
+
+/* Constants fixed by the PC BIOS. */
+#define LOADER_BASE 0x7c00      /* Physical address of loader's base. */
+#define LOADER_SIZE 0x200       /* Loader size in bytes (one disk sector). */
+
+/* Physical address of kernel base. */
+#define LOADER_KERN_BASE 0x100000       /* 1 MB. */
+
+/* The loader maps 4 MB of the start of physical memory to this
+   virtual base address.  Later, the kernel adds the rest of
+   physical memory to the mapping.
+   This must be aligned on a 4 MB boundary. */
+#define LOADER_PHYS_BASE 0xb0000000     /* 3 GB. */
+
+/* Offsets within the loader. */
+#define LOADER_BIOS_SIG (LOADER_SIZE - 2)        /* aa55 BIOS signature. */
+#define LOADER_CMD_LINE (LOADER_BIOS_SIG - 0x80) /* Kernel command line. */
+#define LOADER_RAM_PAGES (LOADER_CMD_LINE - 4)   /* # of pages of RAM. */
+
+#endif /* loader.h */