[docs] Update docs: kernel mem, process init

Updated documentation: Added documentation on the kernel address space
layout, process initialization, and rebuilt the syscall docs.

scripts/memory.py

@@ -1,6 +1,18 @@
+
+def unit(size):
+    units = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
+
+    o = 0
+    while size >= 1024 and o < len(units):
+        o += 1
+        size = size >> 10
+
+    return f"{size} {units[o]}"
+
+
 class Layout:
     from collections import namedtuple
-    Region = namedtuple("Region", ("name", "start", "size", "shared"))
+    Region = namedtuple("Region", ("name", "desc", "start", "size", "shared"))
 
     sizes = {'G': 1024 ** 3, 'T': 1024 ** 4}
 
@@ -26,7 +38,7 @@ class Layout:
             for r in data:
                 size = Layout.get_size(r["size"])
                 addr -= size
-                regions.append(Layout.Region(r["name"], addr, size,
+                regions.append(Layout.Region(r["name"], r["desc"], addr, size,
                     r.get("shared", False)))
 
         self.regions = tuple(regions)