Record networking and DMA development progress

Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.

CODE/UTSM/include/utsm/crypto.h

@@ -0,0 +1,17 @@
+#ifndef UTSM_CRYPTO_H
+#define UTSM_CRYPTO_H
+
+#include <utsm/types.h>
+#include <utsm/uuid.h>
+
+struct utsm_segment_desc;
+
+typedef struct {
+    u64 words[4];
+} utsm_key_material;
+
+void utsm_kdf_segment_key(uuid128_t process_uuid, uuid128_t segment_uuid, u64 key_epoch, utsm_key_material *out_key);
+u64 utsm_make_tweak(u64 tweak_seed, u64 line_index, u64 key_epoch);
+void utsm_crypt_line(const utsm_key_material *key, u64 tweak, const u8 *in, u8 *out);
+
+#endif