1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Support for the configuration register space at port I/O locations 4 * 0x22 and 0x23 variously used by PC architectures, e.g. the MP Spec, 5 * Cyrix CPUs, numerous chipsets. As the space is indirectly addressed 6 * it may have to be protected with a spinlock, depending on the context. 7 */ 8 9 #include <linux/spinlock.h> 10 11 #include <asm/pc-conf-reg.h> 12 13 DEFINE_RAW_SPINLOCK(pc_conf_lock); 14