FABRIC-3.10.8 MC-1a: the core table, and amd64's second core online and parked

hal/smp.c: dense logical core ids, a heap-sized core table, one-at-a-time
bring-up under a 1 s bound, park-wake reporting at the idle point.
amd64: MADT enumeration, a relocation-free real->long-mode trampoline
copied below 1 MiB, INIT-SIPI-SIPI via the LAPIC ICR; QEMU -smp 2.
Core 1 reports online with GS on its own block, parks with 0 wakes;
aarch64/riscv64 report 1 core until MC-1b/c. 3-ISA acceptance clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

include/starkernel/smp.h

@@ -0,0 +1,63 @@
+/*
+  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.
+*/
+
+/**
+ * smp.h - The core table and secondary-core bring-up (FABRIC-3.10.8 MC-1).
+ *
+ * Core ids are dense and logical: core 0 is the boot core, whatever its
+ * hardware id; the others are numbered in enumeration order. The hardware
+ * id lives in the core's block (sk_percpu_t.hw_id) and never in a lock's
+ * owner word.
+ *
+ * MC-1: a secondary core comes up, reports, and parks -- interrupts masked,
+ * halted, every wake counted. It does no console, log or heap work.
+ */
+#ifndef STARKERNEL_SMP_H
+#define STARKERNEL_SMP_H
+
+#include <stdint.h>
+#include "starkernel/percpu.h"
+#include "uefi.h" /* BootInfo */
+
+/* Enumerate the cores, bring each secondary up in turn and wait (bounded)
+ * for it to park. Boot core only, interrupts off; after the heartbeat
+ * init. Prints one line per core. */
+void sk_smp_init(BootInfo *boot_info);
+
+uint32_t     sk_smp_core_count(void);
+sk_percpu_t *sk_smp_core(uint32_t core_id);
+
+/* The idle point: logs a parked core's wake count when it has changed.
+ * Call with no lock held. */
+void sk_smp_report(void);
+
+/* Where every secondary core's entry path lands, with its per-CPU register
+ * already set to `pc`. Never returns. */
+void sk_smp_secondary_main(sk_percpu_t *pc) __attribute__((noreturn));
+
+/* ---- per ISA (arch/<isa>/smp.c) ---------------------------------------- */
+
+/* The cores this machine has, boot core included: fills hw_ids[0..cap) in
+ * enumeration order and returns the total (call with cap 0 to count). */
+uint32_t arch_smp_enumerate(BootInfo *boot_info, uint64_t *hw_ids, uint32_t cap);
+
+/* The boot core's own hardware id. */
+uint64_t arch_smp_boot_hw_id(void);
+
+/* Start the core `pc` describes on `stack_top`; returns 0 once the start
+ * sequence was issued (arrival is observed through pc->online). */
+int arch_smp_start(BootInfo *boot_info, sk_percpu_t *pc, void *stack_top);
+
+/* One park step: interrupts stay masked; returns when the core wakes. */
+void arch_smp_park_once(void);
+
+#endif /* STARKERNEL_SMP_H */