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-rw-r--r--arch/x86/lib/pc-conf-reg.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/lib/pc-conf-reg.c b/arch/x86/lib/pc-conf-reg.c
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+++ b/arch/x86/lib/pc-conf-reg.c
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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for the configuration register space at port I/O locations
+ * 0x22 and 0x23 variously used by PC architectures, e.g. the MP Spec,
+ * Cyrix CPUs, numerous chipsets. As the space is indirectly addressed
+ * it may have to be protected with a spinlock, depending on the context.
+ */
+
+#include <linux/spinlock.h>
+
+#include <asm/pc-conf-reg.h>
+
+DEFINE_RAW_SPINLOCK(pc_conf_lock);