§H.12 step 2: session-slot table, session_find/session_register

src/starkernel/vm/session.c: kmalloc'd-at-boot slot table sized from stadium_max_vm_count() (mirrors stadium.c's own StadiumVMQuota, not a fixed compile-time array as originally planned -- that table was already moved off a fixed array for the same "population isn't knowable in advance" reason). session_boot_init()/session_find()/session_register() implemented for real, no stubs; session_register() zeroes identity and leaves pinned=0, matching VMIdentity's own documented default and deferring pin policy to callers. Added session.c to Makefile.starkernel's explicit source lists. No callers yet. Verified 3-arch boot to ok> (amd64/aarch64/riscv64). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-03 06:03:14 -04:00
parent 668e36bb17
commit 6d9fe3f515
12 changed files with 27751 additions and 4 deletions
@@ -0,0 +1,124 @@
+/*
+  StarForth — Steady-State Virtual Machine Runtime
+
+  Copyright (c) 2023–2025 Robert A. James
+  All rights reserved.
+
+  This file is part of the StarForth project.
+
+  Licensed under the StarForth License, Version 1.0 (the "License");
+  you may not use this file except in compliance with the License.
+
+  You may obtain a copy of the License at:
+      https://github.com/star.4th@proton.me/StarForth/LICENSE.txt
+
+  This software is provided "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  express or implied, including but not limited to the warranties of
+  merchantability, fitness for a particular purpose, and noninfringement.
+
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ */
+
+/**
+ * session.c - Per-VM session bookkeeping (FABRIC-3.md §H.12 step 2)
+ *
+ * Slot table sized from stadium_max_vm_count() at session_boot_init() time,
+ * mirroring stadium.c's own StadiumVMQuota table (kmalloc'd to a
+ * budget-computed count, not a fixed compile-time array -- population isn't
+ * knowable in advance, same reasoning stadium.c's own history already
+ * settled). No callers yet; wiring into the boot sequence and into
+ * stadium_birth_hera()/capsule_birth.c's admission path are later
+ * §H.12 steps.
+ */
+
+#ifdef __STARKERNEL__
+
+#include "starkernel/session.h"
+#include "starkernel/vm/stadium.h"
+#include "starkernel/kmalloc.h"
+
+static Session *g_sessions        = (Session *)0;
+static size_t   g_session_slots   = 0; /* capacity, from stadium_max_vm_count() */
+static size_t   g_session_count   = 0; /* slots actually in use, 0..g_session_slots */
+
+int session_boot_init(void)
+{
+    size_t max_vm_count = stadium_max_vm_count();
+    Session *slots;
+    size_t i;
+
+    if (max_vm_count == 0) return -1; /* Stadium not yet initialized */
+
+    slots = (Session *)kmalloc(max_vm_count * sizeof(Session));
+    if (!slots) return -1;
+
+    for (i = 0; i < max_vm_count; i++) {
+        uint8_t *raw = (uint8_t *)&slots[i];
+        size_t   j;
+        for (j = 0; j < sizeof(Session); j++) raw[j] = 0;
+        slots[i].vm_id  = vm_uuid_none();
+        slots[i].parent = vm_uuid_none();
+    }
+
+    g_sessions      = slots;
+    g_session_slots = max_vm_count;
+    g_session_count = 0;
+    return 0;
+}
+
+Session *session_find(VMUuid vm_id)
+{
+    size_t i;
+
+    if (!g_sessions) return (Session *)0;
+
+    for (i = 0; i < g_session_slots; i++) {
+        if (!vm_uuid_is_none(g_sessions[i].vm_id) &&
+            vm_uuid_equal(g_sessions[i].vm_id, vm_id)) {
+            return &g_sessions[i];
+        }
+    }
+    return (Session *)0;
+}
+
+Session *session_register(VMUuid vm_id, VMUuid parent, const char *name)
+{
+    size_t i;
+    Session *slot = (Session *)0;
+
+    if (!g_sessions) return (Session *)0;
+    if (session_find(vm_id)) return (Session *)0; /* already registered */
+
+    for (i = 0; i < g_session_slots; i++) {
+        if (vm_uuid_is_none(g_sessions[i].vm_id)) {
+            slot = &g_sessions[i];
+            break;
+        }
+    }
+    if (!slot) return (Session *)0; /* table full */
+
+    slot->vm_id  = vm_id;
+    slot->parent = parent;
+    slot->pinned = 0;
+
+    {
+        size_t j = 0;
+        if (name) {
+            for (; j < SESSION_NAME_BUF - 1u && name[j]; j++) slot->name[j] = name[j];
+        }
+        slot->name[j] = '\0';
+    }
+
+    {
+        uint8_t *raw = (uint8_t *)&slot->identity;
+        size_t   j;
+        for (j = 0; j < sizeof(VMIdentity); j++) raw[j] = 0;
+    }
+
+    g_session_count++;
+    return slot;
+}
+
+#endif /* __STARKERNEL__ */