ptos: ke: Add per-processor scheduler queue + PBI packer

Signed-off-by: Chloe M <chloe@mensia.org>

service/ptos/arch/amd64/cpu/init.c

@@ -88,4 +88,7 @@ HalKpcrP2Init(KPCR *Kpcr)
         : "i" (GDT_TSS)
         : "memory"
     );
+
+    /* Initialize the scheduler queue */
+    SCHED_QUEUE_INIT(&Kpcr->SchedQueue);
 }

service/ptos/head/hal/kpcr.h

@@ -11,6 +11,7 @@
 
 #include <ptdef.h>
 #include <ex/pool.h>
+#include <ke/sched.h>
 #include <machine/mcb.h>
 
 /*
@@ -19,11 +20,13 @@
  *
  * @Id:             Logical processor ID assigned by us
  * @PoolRegion:     Allocator pool region
+ * @SchedQueue:     Per-core scheduler queue
  * @Mcb:            Machine core block
  */
 typedef struct {
     USHORT Id;
     POOL_REGION PoolRegion;
+    SCHED_QUEUE SchedQueue;
     MCB Mcb;
 } KPCR;
 

service/ptos/head/ke/sched.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Scheduler management
+ * Author:      Chloe M.
+ */
+
+#ifndef _KE_SCHED_H_
+#define _KE_SCHED_H_ 1
+
+#include <ps/thread.h>
+#include <ptdef.h>
+#include <queue.h>
+
+/*
+ * Represents a scheduler queue that threads can be pulled
+ * from and added to.
+ *
+ * @ThreadQueue:  Represents the actual queue that holds threads
+ * @QueueEntries: Represents the number of entries in the queue
+ */
+typedef struct {
+    TAILQ_HEAD(, _THREAD) ThreadQueue;
+    USIZE QueueEntries;
+} SCHED_QUEUE;
+
+/* Macro used to initialize the scheduler queue */
+#define SCHED_QUEUE_INIT(SQ_P)          \
+    TAILQ_INIT(&(SQ_P)->ThreadQueue);   \
+    (SQ_P)->QueueEntries = 0;
+
+#endif  /* !_KE_SCHED_H_ */