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-rw-r--r--na/kernel/sync/cpu_state.h35
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diff --git a/na/kernel/sync/cpu_state.h b/na/kernel/sync/cpu_state.h
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--- a/na/kernel/sync/cpu_state.h
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-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* Copyright (C) 2026 Richard Qin */
-
-#pragma once
-
-/*
- * Per-CPU Interrupt Nesting Tracker
- *
- * Tracks spinlock nesting depth on each CPU to ensure interrupts
- * are only restored when the last spinlock is released.
- *
- * BSS-segment global array; zero-initialized by entry.S BSS clear.
- * Reference: docs/specs/spinlock.md §3.1
- */
-
-#include <lume/types.h>
-#include <lume/config.h>
-
-namespace sync {
-
-struct CpuSyncState {
- int lock_depth; // Number of spinlocks held by this CPU
- bool intr_was_on; // Were interrupts enabled before the first lock?
-};
-
-inline constexpr uint64 kInvalidCpuId = ~0ULL;
-
-// BSS-segment global array, zero-initialized by entry.S
-extern CpuSyncState g_cpu_sync_states[kMaxCpus];
-
-// Internal API — called only by Spinlock::acquire/release
-void push_intr();
-void pop_intr();
-
-} // namespace sync