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/core/utsm_init.c

@@ -0,0 +1,32 @@
+#include <utsm/utsm.h>
+#include <utsm/segment.h>
+#include <utsm/pckc.h>
+#include <utsm/log.h>
+
+static utsm_segment_desc g_segments[UTSM_MAX_SEGMENTS];
+static u64 g_generation = 1;
+
+void utsm_init(void) {
+    log_info("[UTSM] segment table reset begin");
+    for (u32 i = 0; i < UTSM_MAX_SEGMENTS; i++) {
+        g_segments[i].state = UTSM_SEG_FREE;
+        g_segments[i].generation = 1;
+    }
+    log_info("[UTSM] segment table reset ok");
+
+    g_generation = 1;
+    log_info("[UTSM] pckc init begin");
+    utsm_pckc_init();
+    log_info("[UTSM] pckc init ok");
+}
+
+utsm_segment_desc *utsm_get_segment(u32 slot) {
+    if (slot >= UTSM_MAX_SEGMENTS) {
+        return NULL;
+    }
+    return &g_segments[slot];
+}
+
+u64 utsm_next_generation(void) {
+    return g_generation++;
+}